Abstract: A three-dimensional slot antenna includes a loop conductor, a first conductor arm, a second conductor arm, and a third conductor arm. The first radiator section, the second radiator section and the third radiator section are disposed on a same plane. The second radiator section cooperates with the first and third radiator sections to form a first slot segment. The first radiator section further cooperates with the third radiator section to form a second slot segment. The first and second slot segments form a substantially T-shaped slot.

Abstract: A feeding device for a smart antenna includes a signal reception terminal, a first antenna feeding terminal, a second antenna feeding terminal, a power divider, and a switching circuit. The signal reception terminal is utilized for receiving a transmitting signal. The first antenna feeding terminal and the second antenna feeding terminal are utilized for outputting feeding signals to the two antennas, respectively. The power divider, having a first input port, a second input port, a first output port, and a second output port, is utilized for distributing energy received by the first input port or the second input port equally to the first output port and the second output port, and making signals of the first output port and the second output port having 90 degree phase difference. The switching circuit performs switching operations to control electrical connections of the power divider according to a control signal.

Abstract: A broadband power splitter and phase shifter having a plurality of transmission lines, a 3 db, zero degree power splitter for splitting a signal, an open quadrifilar spiral for receiving a first signal and reflecting power, a modified, open quadrifilar spiral for receiving a second output after a delay and for reflecting power, and wherein a difference between the reflected power from the open quadrifilar spiral and the modified, open quadrifilar spiral in conjunction with a delay provides a constant phase shift over a broad range of frequencies.

Abstract: An antenna device includes an antenna element and a printed circuit board on which the antenna element is mounted. The antenna element includes a base, a radiation conductor formed on an upper surface of the substrate and one end of the radiation conductor being an open end, a plurality of terminal electrodes formed on a bottom surface of the substrate, and a loop conductor of a substantially U-shape. The loop conductor is arranged to face one of the terminal electrodes via a gap having a predetermined width. An antenna mounting region is provided on a upper surface of the printed circuit board to be adjacent to an edge of a long side of the printed circuit board. A feed line is led in the antenna mounting region along the edge. One and the other end of the loop conductor are connected to the feed line and a ground pattern, respectively.

Abstract: An antenna element is formed by providing a radiation electrode on a base member made of a dielectric material. To protect the antenna element from external impact, a void is formed between a housing and the antenna element. This void is filled with a solid member. The relative permittivity of the solid member is equal to or higher than the relative permittivity of the housing, and equal to or lower than the relative permittivity of the base member. The solid member is formed as an elastic member.

Abstract: A wide-band antenna mounted on a circuit board includes a ground plate, a radiating plate perpendicularly connected to two side edges of the circuit board, and a planar antenna element which includes a base plate, an extending plate, and a ground portion. One side of the base plate defines a gap with a first coupling portion being formed, and a slot adjacent to the gap with a first strip being formed therebetween. A second strip is extended perpendicularly from the first strip. The extending plate is extended outward from one end of the base plate. The ground portion is extended outward from the second strip and connected to the ground plate. The first coupling portion and the ground portion have an interspace to form a capacitive coupling therebetween. A groove is formed among the first and second strips and the ground portion to form a simulation inductance thereamong.

Abstract: An antenna for receiving electromagnetic waves in a desired frequency band, includes a radiating conductor and a ground conductor, a feeder part, a wavelength-shortening section, and a magnetic field applying section. The radiating conductor and a ground conductor resonate at a resonance point frequency. The feeder part is configured to feed the radiating conductor with electricity. The wavelength-shortening section in which a magnetic body having both a dielectric property and a magnetic property is disposed close to the radiating conductor shifts the resonance point frequency into a band lower than the desired frequency band by a wavelength-shortening effect obtained based on the dielectric property and the magnetic property. The magnetic field applying section is configured to apply a magnetic field to the magnetic body so as to reduce a magnetic loss due to the magnetic body.

Abstract: A unidirectional wireless antenna with a front-to-back ratio of 20 dB comprises a loop antenna and a dipole antenna interconnected by a metallic element and printed on a printed circuit board. The antenna is small in size but provides good unidirectional transmission.

Abstract: The invention provides a micro strip antenna used for both a near-field region and a remote-field region. A micro strip antenna comprises: a first dielectric substrate; a main patch, having a triangle shape under the first dielectric substrate, configured to feed a radiation current; a second dielectric substrate over the first dielectric substrate; and a sub patch, formed under the second dielectric substrate, configured to desert a current from the main patch to provide a vertical magnetic field.

Abstract: An antenna testing device includes an analyzer, a transmission probe electrically connected to the analyzer, a receiving probe electrically connected to the analyzer, and a shielded box having a cutoff frequency. The analyzer generates a test signal the frequency of which is lower than the cutoff frequency, the transmission probe receive the test signal and sends the test signal to the shielded box. The antenna is coupled with the transmission probe and generates a coupled signal, the receiving probe receives the coupled signal and sends the coupled signal to the analyzer. The analyzer analyzes the coupled signal and the test signal, the analyzer calculates the return loss of the antenna.

Abstract: The invention discloses a wireless signal antenna including a substrate, a grounding element, a metal radiator element, a signal transmission line, and a ground connection part. The metal radiator element includes a first radiator unit, a second radiator unit, and a signal feed-in point. The ground connection part is electrically connected to the signal feed-in point and the grounding element. The first radiator unit is disposed on the substrate and bent to include a first radiator part, a second radiator part, and a third radiator part, wherein at least a part of the first radiator unit is disposed along edges of the substrate. The second radiator unit is disposed between the first radiator unit and the grounding element. The signal transmission line includes a signal line and a ground line respectively connected to the signal feed-in point and a layout area of the grounding element.

Abstract: Apparatus and methods for enhancing the gain of a wireless signal are provided. In at least one specific embodiment, the apparatus can include a screen comprised of one or more electrically conductive regions for reflecting electromagnetic radiation and one or more non-conductive regions for permitting electromagnetic radiation therethrough. The one or more electrically conductive regions can be disposed adjacent to at least one of the one or more non-conductive regions. The apparatus can also include a support member disposed about at least a portion of the screen. The screen can be capable of collapsing by twisting the support member in opposite screw senses to form interleaved concentric sections.

Abstract: An antenna for a Radio-Frequency IDentification (RFID) system is disclosed that comprises a pair of resonant cavities. The antenna is realized by folding the ends of a ribbon of conductive material, such as metal foil, over the middle part of the ribbon. The antenna generates a higher voltage than prior-art antennas used in RFID systems, and it makes possible RFID systems with an improved range. In an alternative embodiment, the antenna comprises a reflector that enables the RFID system to better tolerate the presence of nearby metal objects.

Abstract: Disclosed herein is an antenna device including, a radiator having a feeder, and a planar reflector spaced from the radiator in a radio wave incoming direction, the reflector having at least one slit defined in a side edge thereof.

Abstract: An antenna device includes a substrate, and a dual-band antenna disposed on a surface of the substrate. The dual-band antenna includes a feed-in section, a first radiator arm, a second radiator arm, a third radiator arm, and a ground section. The feed-in section is for signal feed-in, and has opposite first and second ends. The first radiator arm extends from the first end of the feed-in section and is parallel to the feed-in section. The second radiator arm is connected to the second end of the feed-in section and extends parallel to the feed-in section. The third radiator arm is disposed adjacent to and extends parallel to the first radiator arm in a manner that the feed-in section is disposed between the third radiator arm and the second radiator arm. The ground section is connected to the third radiator arm.

Abstract: A single-band antenna, comprising: a substrate; a first radiation unit; a conductive material; an impedance matching circuit; a signal feed-in terminal; a second radiation unit; and a wire connecting unit. Therefore, the single-band antenna can be miniaturized to be installed with or inside a compact wireless transmission device with enhanced transceiving performance.

Abstract: An antenna apparatus includes: a ground plane; a plurality of conductive elements arranged substantially in parallel to a surface of the ground plane; a plurality of linear elements configured to connect the conductive elements to the ground plane; and an antenna configured to radiate a radio wave, wherein a plurality of openings to reflect the radio wave radiated from the antenna are formed in the ground plane under an arrangement region of the conductive elements.

Abstract: An apparatus for measuring radiated power of a terminal includes: an enclosure including a pair of couplers configured to couple an electromagnetic field radiated from the terminal or a substitution antenna and a measurement jig configured to rotate the terminal or the substitution antenna, the terminal or the substitution antenna being supposed to be arranged between the pair of couplers, with reference to at least one of X, Y, and Z axes; a driver installed outside the enclosure to drive the measurement jig; a signal generator configured to generate a feed signal transferred to the substitution antenna when the substitution antenna is arranged on the measurement jig; a feed signal transmitter configured to transfer the feed signal generated by the signal generator to the substitution antenna; and a spectrum analyzer configured to measure power of a radiated signal radiated from the terminal or the substitution antenna.

Abstract: A microwave antenna assembly is disclosed. The antenna assembly includes a feedline having an inner conductor, an outer conductor and an inner insulator disposed therebetween and a radiating portion including a dipole antenna coupled to the feedline and a trocar coupled to the dipole antenna at a distal end thereof. The antenna assembly also includes a slidable outer jacket disposed about the radiating portion and the feedline. The slidable outer jacket being configured to slide about at least one of the radiating portion and the feedline from a closed configuration, in which the slidable outer jacket is mated with the trocar and a retracted configuration, in which the slidable outer jacket is retracted in a proximally exposing at least a portion the radiating portion.

Abstract: An apparatus and methods for operating a frequency selective surface are disclosed. The apparatus can be tuned to an on/off state or transmit/reflect electromagnetic energy in any frequency. The methods disclosed teach how to tune the frequency selective surface to an on/off state or transmit/reflect electromagnetic energy in any frequency.