Abstract: As a non-limiting example, various aspects of this disclosure provide embodiments of antenna apparatus using monocone antennas for wireless communication.

Abstract: Base station antennas are provided herein. A base station antenna includes one or more vertical columns of low-band radiating elements configured to transmit RF signals in a first frequency band. The base station antenna also includes a plurality of vertical columns of high-band radiating elements configured to transmit RF signals in a second frequency band that is higher than the first frequency band. The vertical columns of high-band radiating elements extend in parallel with the one or more vertical columns of low-band radiating elements in a vertical direction.

Abstract: An antenna structure comprising: a first port; a second port; and a single radiator connected to both the first and second ports, the single radiator being operable to simultaneously transceive in: a symmetrical excited mode in which current flows symmetrically through the single radiator to or from the first port, thereby causing the single radiator to resonate at a first resonant frequency; and an asymmetrical excited mode in which current flows asymmetrically through the single radiator to or from the second port, thereby causing the single radiator to resonate at a second resonant frequency. The single radiator comprises: a first element, a second element, and arm connectors connecting the first element to the second element. The first element being elongate and linear. The second element being elongate, linear, and parallel to the first element.

Abstract: An antenna assembly includes a housing and first and second antennas enclosed within the housing. The first antenna provides a first radiation pattern oriented for wireless communication with a cloud-based network. The second antenna provides a second radiation pattern that is oriented different than the first radiation pattern and is oriented for wireless communication with a portable user device.

Abstract: An antenna module includes a first antenna radiator including a feeding terminal, a second antenna radiator, a first ground radiator, a second ground radiator and a capacitive element. The second antenna radiator is disposed on one side of the first antenna radiator, and a first gap is formed between a main portion of the second antenna radiator and the first antenna radiator. The first ground radiator is disposed on another side of the first antenna radiator, and a second gap is formed between the first antenna radiator and the first antenna radiator. The second ground radiator is disposed between the second antenna radiator and the first ground radiator, and a third gap is formed between the second ground radiator and a first branch of the second antenna radiator. The capacitive element is disposed on the third gap and connects the second antenna radiator and the second ground radiator.

Abstract: An antenna device is disclosed, including an additively manufactured tubular body portion having a wall portion with a plurality of holes. The tubular body portion is configured to transmit electromagnetic radiation in a selected operating frequency range, and to have a mass below a maximum mass threshold. The plurality of holes reduce the mass of the tubular body below the maximum mass threshold without significantly adversely affecting electromagnetic radiation transmission capability of the tubular body in the selected operating frequency range.

Abstract: A support piece comprises: a first support section configured in the shape of a plate, and a plurality of second support sections; every second support section in the plurality of second support sections is set on the outside of the first support section and is bent relative to the first support section; every second support section comprises at least one support structure. At least a portion of the support structure of the at least one support structure is configured to support a first dipole arm, and at least a portion of the support structure of the at least one support structure is configured to support a second dipole arm; a second arm section on the outside of the first dipole arm is bent relative to the first arm section on the inside toward a first side of the first support section to support the dipole arm; a second arm section on the outside of the second dipole arm is bent relative to the first arm section on the inside toward a second side of the first support section opposite to the first side.

Abstract: A base station antenna includes first and second reflectors that are movable relative to each other, and each of the first and second reflectors includes a plurality of radiating elements on a main reflector surface thereof. A third reflector is movably coupled to the first and second reflectors, and movement of the third reflector causes the first and second reflectors to move relative to each other. A drive mechanism is utilized to move the third reflector and includes a drive shaft, an actuator configured to rotate the drive shaft, and a threaded shaft coupled to the drive shaft and configured to rotate in response to rotation of the drive shaft. Rotational movement of the threaded shaft causes linear movement of the third reflector. A control unit, such as a remote electrical tilt (RET) controller controls the actuator to rotate the driveshaft.

Abstract: This disclosure describes an elastic multi-contact probe that includes conductive strips each of which comprises a conductive elastomer; dielectric strips formed on a back surface of a respective conductive strip; and a layer of a thermoplastic formed on back surfaces of the dielectric strips. The disclosure also describes a method that includes measuring a first I-V curve between a pair of inner probes of the an elastic multi-contact probe based on a first current applied to a pair of outer probes; determining a first slope of a linear region of the first I-V curve; measuring a second I-V curve between the pair of inner probes based on a second current applied to the pair of inner probes; determining a second slope of a linear region of the second I-V curve; and calculating a sheet resistance and a contact resistivity of the semiconductor material based on the first and second slopes.

Abstract: The present invention relates to a multiband antenna specifically adapted for use with a Base Station Antenna (“BSA”). The present invention provides narrow azimuth or horizontal beamwidth (“HBW”) having 45 degrees and operational over four frequency bands. The composite antenna topology and associated circuitry described in embodiments achieves reduced antenna installation requirements and allows for ease of network deployment or reconfiguration at reduced cost. Embodiments employ an array of low band radiating elements and two sets of high band radiating elements. The first set is co-located within an array of low band radiating elements. The second set of is offset and outside the low band radiating elements. An RF feed network energizes the first and second set of high band radiating elements to compensate for interference between the high and low band elements.

Abstract: Methods and apparatus are provided for allowing a transmitter (Tx) to perform antenna selection independently of a receiver (Rx) in a transceiver supporting both transmit diversity and receive diversity. Certain aspects may utilize a cross switch, which may be used in a parallel or cross configuration, to provide for the independent antenna selection, such that the Rx may maintain the ability to operate on the same antenna as the Tx, on another antenna, or on both antennas for enhanced receive diversity. Furthermore, certain aspects may employ additional switching in the baseband domain in an effort to avoid, or at least reduce, switching glitches in the Rx caused by changing the cross switch configuration. In this manner, the Rx need not re-converge upon antenna switching.

Abstract: The invention relates to the locating and identifying of objects with radiofrequency communication by inductive coupling, without electrical contact, between a reader and a tag. The device includes an array of N fixed RFID markers of RFID tag type, with inductive antennas placed at known positions, N being an integer greater than 1 and an RFID tag reader provided with a fixed reading inductive antenna passing in proximity to the N markers. The position of the N markers with respect to the inductive reading antenna is such that the mutual inductance between the inductive antenna of any marker and the inductive reading antenna is zero when no object to be located is present in the vicinity of the array of markers, and nonzero when an RFID tag is present in the vicinity of the marker considered. A coupling is established in the presence of a mobile tag in proximity to a marker.

Abstract: Methods and apparatus are provided for allowing a transmitter (Tx) to perform antenna selection independently of a receiver (Rx) in a transceiver supporting both transmit diversity and receive diversity. Certain aspects may utilize a cross switch, which may be used in a parallel or cross configuration, to provide for the independent antenna selection, such that the Rx may maintain the ability to operate on the same antenna as the Tx, on another antenna, or on both antennas for enhanced receive diversity. Furthermore, certain aspects may employ additional switching in the baseband domain in an effort to avoid, or at least reduce, switching glitches in the Rx caused by changing the cross switch configuration. In this manner, the Rx need not re-converge upon antenna switching.

Abstract: A MMIC amplifier is directly connected to the balanced feed points at the aperture of an antenna to eliminate the distance between electronics coupled to the antenna and the antenna itself, such that interfaces, components and connection lines which introduce losses and parasitic effects that degrade system performance are eliminated due the direct connection. Expanding the aperture of the antenna to accommodate the direct connection of a MMIC amplifier to balanced feed points of an antenna has been found to have no deleterious effects on antenna performance. Moreover, when coupling the MMIC amplifier to an unbalanced coaxial line, any associated ripple is minimized due to the direct connection.

Abstract: An apparatus that achieves high isolation between dipoles and feed systems is provided. The apparatus includes a plurality of transmission lines, a first dipole electrically connected to a first set of the plurality of transmission lines, and second dipole electrically connected to a second set of the plurality of transmission lines. The electric field of the first dipole is parallel to an electric field of the first set of the plurality of transmission lines, and an electric field of the second dipole is parallel to an electric field of the second set of the plurality of transmission lines.

Abstract: A wireless communication terminal according to the embodiment includes a communication module including a circuit board having a plurality of pins; a shield case antenna overlapping with one side of the circuit board, electrically connected to a part of the pins and including a signal receiving unit; and a signal processing unit for processing the received signals. An antenna matching unit for matching impedance between the signal processing unit and an antenna unit, a phase shifter for controlling a phase of the received signal and an amplitude regulator for adjusting amplitude of the received signal are provided between the signal processing unit and the antenna unit.

Abstract: A multimode antenna structure is described for a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. By way of one or more connecting elements, electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element.

Abstract: A broadband radiation unit includes first and second pairs of symmetric dipoles operable to transmit communication signals and to receive communication signals. The first pair of symmetric dipoles has a polarization that is orthogonal to that of the second pair of symmetric dipoles. The first and second pairs of symmetric dipoles together define an annular structure. A plurality of baluns are associated with the first and second pairs of symmetric dipoles such that a given one of the baluns is associated with a respective symmetric dipole of the pairs of symmetric dipoles. Each one of the baluns feeds a balanced current to its associated symmetric dipole. Each symmetric dipole of the first and second pairs of symmetric dipoles has two unit arms which are disposed on and arranged symmetrically about its associated balun.

Abstract: A method is provided for reducing near-field radiation and specific absorption rate values in a communications device that includes a multimode antenna structure transmitting and receiving electromagnetic signals and circuitry for processing signals communicated to and from the antenna structure. The method includes adjusting the relative phase between signals fed to neighboring antenna ports of the antenna structure such that a signal fed to the one antenna port has a different phase than a signal fed to the neighboring antenna port to provide antenna pattern control and to increase gain in a selected direction toward a receive point. The method features using a transmit power lower than the transmit power used in a non-pattern control operation of the antenna structure such that the communications device obtains generally equivalent wireless link performance with the receive point using reduced transmit power compared to the non-pattern control operation, thereby reducing the specific absorption rate.

Abstract: An RFID tag and an RFID access card configured to reduce detuning effects from a typical RFID environment. The present invention provides an RFID tag that is specifically configured to reduce the detuning effects caused by initiating communication between an RFID tag and an RFID tag reader in the presence of materials such as metal, liquid, and the human body. In one embodiment, the present invention provides an RFID tag comprising an electronic circuit portion attached to a main antenna body portion, the main antenna body portion having two opposite side portions, which are substantially symmetrical with respect to one another, wherein each side portion extends outwardly to form a generally side-oriented v-shape.

Abstract: A multimode antenna structure is described for a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. By way of one or more connecting elements, electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element.

Abstract: Provided herein are devices, systems and techniques for establishing a variable height conformal antenna array having a planar backplane. More particularly, positioning of radiating elements can be made insensitive to variable ground height by selecting a suitable radiating element, such as a flared notch and arranging them to have a profile such that their outer extremities are positioned along a conformal, curved shape. Differences in radiator heights can be taken up by the addition of parallel vertical ground planes disposed between the radiating elements and the backplane. Adjacent vertical ground planes effectively form cutoff waveguide sections that naturally isolate the backplane from the radiating elements. The vertical ground planes edges effectively form a virtual curved ground for the radiating elements, following curvature of the array profile. Accordingly, heights of radiating elements are uniform with respect to the virtual ground, while being allowed to vary with respect to the backplane.

Abstract: The replacement and elimination of duplexers in a tightly coupled dipole phased array starts with transmit and receive functions physically separated and having different antenna port feeds. The simple coupling network used with tightly coupled dipole arrays is replaced by a state switch which alternates between a coupling state and a dipole feed connection state. The basic method can be applied to antenna apertures of various kinds, including both linear and dual polarized versions. The ability to locate state switches at various nodes in tightly coupled dipole phased arrays permits flexibility in antenna design and eliminates bulky and lossy components, simplifies the design requirements and allows independent optimization of the components.

Abstract: A multimode antenna structure transmits and receives electromagnetic signals in a communications device.

Abstract: It is characterized in that it includes; a single antenna element corresponding to a first frequency band and a second frequency band that is different from the first frequency band; a power feeding point for supplying AC power to the antenna element; and a parallel resonance circuit electrically connected between the antenna element and the power feeding point, and the parallel resonance circuit has impedance that is set so as to indicate induction properties in the first second frequency band and set so as to indicate capacitance properties in the second frequency band, and return loss in the first and second frequency bands is sufficiently small so as to enable wireless communication.

Abstract: A compact wireless communication includes a first radiating element and a second radiating element, which define and function as a dipole antenna, a feeder circuit including a wireless IC chip coupled with the first and second radiating elements, and a feeder substrate that is provided with the wireless IC chip. The first radiating element is provided to the feeder substrate. The second radiating element is provided to a substrate other than the feeder substrate.

Abstract: An antenna apparatus that can be miniaturized without causing inference caused by antenna currents to be occurred if the high band of a dual band wireless system is close to the band of another wireless system in a wireless communication apparatus incorporating the dual band wireless system and another wireless system is provided. A first switch 5 blocks passage of a signal of a high band (first frequency) and allows passage of a signal of a low band (second frequency). A second switch 6 blocks passage of a signal of the low band (second frequency) and allows passage of a signal of the high band (first frequency). Accordingly, the antenna apparatus operates as a dipole antenna with no antenna current flowing into a feeder line at the first frequency and operates as a monopole antenna wherein a radiation element and a feeder line making up the dipole antenna becomes a radiation element at the second frequency lower than the first frequency.

Abstract: A technique for improving impedance matching in a phased array antenna involves placing a segmented fence around the antenna elements of the array. The antenna elements are arranged above a ground surface such as a ground plane. The segmented fence includes spaced-apart conductive projections electrically coupled to and extending from the ground surface, such that the segmented fence partially terminates electric fields traveling in directions parallel to the ground surface. The segmented fence lies in paths extending in at least two directions along the ground surface to define fence enclosures that surround individual antenna elements. With dual-polarization or multi-polarization dipole antenna elements, the fence enclosures partially terminate the electric field in each direction parallel to the ground surface to simplify impedance matching without unduly restricting the magnetic field.

Abstract: A dual-band dipole antenna (100) includes a ground radiating portion (2), a signal radiating portion (3) and a feed wire (1). The feed wire (1) has a ground portion (12) connected to the ground radiating portion (2), and a core conduct (11) connected to the signal radiating portion (3). The signal radiating portion (3) has a first branch (31), a second branch (32) having a same length and a same width as the first branch (31), and a middle portion (33) connecting the first branch (31) and the second branch (32) at connecting points. Each of the first branch (31) and the second branch (32) has a first radiating length (D1) extending from the connecting point and a second radiating length (D2) extending from the connecting point.

Abstract: A method is provided for reducing near-field radiation and specific absorption rate (SAR) values in a communications device. The communications device includes a multimode antenna structure transmitting and receiving electromagnetic signals and circuitry for processing signals communicated to and from the antenna structure. The method includes adjusting the relative phase between signals fed to neighboring antenna ports of the antenna structure such that a signal fed to the one antenna port has a different phase than a signal fed to the neighboring antenna port to provide antenna pattern control and to increase gain in a selected direction toward a receive point.

Abstract: A multimode antenna structure transmits and receives electromagnetic signals in a communications device.

Abstract: In a stalk-type field probe, each of three resistive dipoles is formed with a resistive feedline on a common circuit board. Each circuit board comprises an elongated feedline section that extends through a cylindrical stalk, and a cross-arm that is disposed at a 54.7° angle relative to the elongation of the feedline section. The feedline sections are arranged to form an equilateral triangular prism, and the cross arms are arranged so that the dipole on each cross-arm is perpendicular to an imaginary plane to which the lines along which the elements of both of the other dipoles extend are parallel.

Abstract: This coplanar differential bi-strip delay line includes two conducting strips disposed on one and the same face of a dielectric substrate and each comprising a first and a second end. The two first ends of the two conducting strips are respectively joined to two conductors of a first bi-strip port for connection to a first external differential device. The two second ends of the two conducting strips are respectively joined to two conductors of a second bi-strip port for connection to a second external differential device.

Abstract: Aspects of a method and system for matching an integrated system to an antenna utilizing on-chip measurement of reflected signals are provided. In a chip comprising at least a portion of a receiver and at least a portion of a transmitter, a best impedance match between an antenna and the chip may be determined based on on-chip measurement of one or more signals reflected from the antenna. The best impedance match between the antenna and the chip may be determined utilizing a correction algorithm. The correction algorithm may be determined utilizing data from an external test set that measures signals transmitted by the chip via the antenna. The reflected signals may be routed to a signal analyzer via on on-chip directional coupler. The best impedance match may be determined for each of a plurality of frequencies and/or each of a plurality of transmit signal strengths.

Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.

Abstract: A balanced dipole antenna, comprising: a left dipole arm having a center end, a right dipole arm having a center end, a coaxial cable having an outer conductor and a single inner conductor and a top end electrically located between the center ends of the left and right dipole arms, a left stub coupling the left dipole arm and the coaxial cable, and a right stub coupling the right dipole arm and the coaxial cable, wherein the inner conductor of the coaxial cable is connected to one of the left and right dipole arms, and the outer conductor of the coaxial cable is connected to the other of the left and right dipole arms.

Abstract: A configurable antenna assembly includes an antenna structure and a configurable antenna interface. The antenna structure is operable, in a first mode, to provide a first antenna structure and a second antenna structure, wherein the first antenna structure receives an inbound radio frequency (RF) signal and the second antenna structure transmits an outbound RF signal. The configurable antenna interface is operable in the first mode to provide a first antenna interface and a second antenna interface, wherein the first antenna interface is configured in accordance with a receive adjust signal to adjust at least one of phase and amplitude of the inbound RF signal, and wherein the second antenna interface is configured in accordance with a transmit adjust signal to adjust at least one of phase and amplitude of the outbound RF signal.

Abstract: Systems and methods provide a HESA (“High Efficiency Sensitivity Accuracy”) direction-finding (“DF”) antenna system that operates over a range from 2 MHz to 18 GHz. The system may include components such as a dipole array, a monopole array, and an edge-radiating antenna, each component being responsive to a specific frequency range. The system may further include biconical flares that optimally terminate a freespace wave in a small aperture.

Abstract: A dual polarized variable beam tilt antenna having a superior Sector Power Ratio (SPR). The antenna may have slant 45 degree dipole radiating elements including directors, and may be disposed on a plurality of tilted element trays to orient an antenna boresight downtilt. The directors may be disposed above or about the respective dipole radiating elements. The antenna has a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, a high-roll off, and is operable over an expanded frequency range.

Abstract: One or more embodiments are directed to a multimode antenna structure for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. The antenna structure also includes one or more connecting elements electrically connecting the antenna elements such that electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element.

Abstract: A feed module is provided for an array antenna. The feed module comprises a multi-layer printed circuit board (PCB) feed structure for coupling signals between connections to transmitters or receivers and connection points for connecting to antenna elements of the array antenna. The multi-layer PCB feed structure comprises a body portion, incorporating coupling components, and a number of line sections for connecting to elements of the array antenna. The planar layers of the multi-layer PCB are arranged to be mounted substantially perpendicular to a planar array of antenna elements of the array antenna when the feed module is integrated therewith.

Abstract: The present invention provides a phaser pack for an elliptically polarized antenna that includes a first structural component, a second structural component and a cylindrical inner conductor. The first structural component includes a recess, coupled to an input port, that forms a first portion of a cylindrical conductive path, while the second structural component includes a recess, coupled to a plurality of output ports, that forms a second portion of the cylindrical conductive path. The recesses of the first and second structural components form a continuous cylindrical conductive path when the first and second structural components are mated. The cylindrical inner conductor includes a plurality of tee junctions and a plurality of transition segments, coupled to the input port and the plurality of output ports, disposed within the continuous cylindrical conductive path to form a coaxial conductor that provides different phase delays to at least two of the plurality of output ports.

Abstract: A dipole antenna may be created by surrounding a portion of the continuous conductor with a nonconductive magnetic bead, and then applying a power source to the continuous conductor across the nonconductive magnetic bead. The nonconductive magnetic bead creates a driving discontinuity without requiring a break or gap in the conductor. The power source may be connected or applied to the continuous conductor using a variety of preferably shielded configurations, including a coaxial or twin-axial inset or offset feed, a triaxial inset feed, or a diaxial offset feed. A second nonconductive magnetic bead may be positioned to surround a second portion of the continuous conductor to effectively create two nearly equal length dipole antenna sections on either side of the first nonconductive magnetic bead. The nonconductive magnetic beads may be comprised of various nonconductive magnetic materials, and preformed for installation around the conductor, or injected around the conductor in subsurface applications.

Abstract: A product includes a power supply circuit board, which includes a power supply circuit having a stable frequency characteristic which enables communication among various products to be obtained. The product includes a power supply circuit board including a power supply circuit arranged thereon having an inductance element, and a wireless communication circuit board electrically connected to the power supply circuit. The wireless communication circuit board is mounted on the power supply circuit board. The product further includes a radiation plate which emits a transmission signal which is supplied from the power supply circuit through electromagnetic field coupling and which has a frequency substantially determined in accordance with a resonant frequency of the power supply circuit, and which is used to supply a reception signal to the power supply circuit through electromagnetic field coupling.

Abstract: An X-band, crossed dipole turnstile antenna configured to be omni-directional with horizontal polarization is disclosed. It comprises a set of two dipole antennas aligned at right angles to each other attached to a common 50 ohm coaxial feedpoint and fed 90 degrees out-of-phase. The antenna pattern is nearly omnidirectional in the horizontal plane. The antenna can be used generally in microwave communications including Digital Radio Frequency Tags (DRaFTs) communicating with airborne and satellite platforms.

Abstract: A symmetrical printed meander dipole antenna includes a dielectric board including a ground plane; a first antenna trace line disposed on a first portion of the dielectric board and in electrical contact with the dielectric board, the first antenna trace line including a plurality of first vertical meandered traces; a second antenna trace line disposed on a second portion of the dielectric board and in electrical contact with the dielectric board, the second antenna trace line including a plurality second vertical meandered traces, wherein the first and second plurality of vertical meandered traces are symmetrical to each other; and an inductor in contact with the first and second antenna trace lines for tuning the impedance of the symmetrical printed meander dipole antenna.

Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.

Abstract: An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station.

Abstract: A broad beam width antenna array, preferably having 360 degrees of azimuth coverage, which also has broad frequency bandwidth, for use in a wireless network system is disclosed. In a preferred embodiment the antenna array comprises a planar dielectric substrate, micro strip elements on both sides of the dielectric substrate, and a corporate feed structure employing parasitic conductive beam width enhancing tubes as feed line conduits. The antenna array comprises dipole radiating elements formed on both sides of the dielectric substrate and a balanced feed network feeding each dipole arm. The shape of the dipole is symmetric and the overall structure, including feed network, preferably has a ?-shape when viewed from either side of the dielectric substrate. Disposed proximate to each dipole arm are bandwidth enhancement coplanar micro strips which are parallel to each dipole arm and at least partially overlapping each other.

Abstract: A first printed circuit board for vertical polarized wave has a plurality of vertical polarized wave elements which serves as antenna elements, and a first feeder circuit which is connected to the plurality of vertical polarized wave elements. A second printed circuit board for horizontal polarized wave has a second feeder circuit which is connected to a plurality of horizontal polarized wave elements which serves as antenna elements, and is mounted with the plurality of horizontal polarized wave elements. A cutout portion is provided between the adjacent two vertical polarized wave elements of the first printed circuit board, and the first and second printed circuit boards are arranged parallel so that the horizontal polarized wave elements are arranged in the cutout portions of the first printed circuit board.