Abstract: An antenna device includes an antenna housing and an antenna element. The antenna element is accommodated in the antenna housing and receives signals in a first frequency band and a second frequency band which is lower than the first frequency band. The antenna element includes a first element that receives signals in the first frequency band and a second element that surrounds the first element and receives signals in the second frequency band. The first element includes a conductive plate which has a predetermined area, the second element includes a conductive plate which has a predetermined area, and the conductive plates are provided in an identical plane or a substantially identical plane.

Abstract: An antenna that enables dense packing of radiators includes a plurality of first radiators configured to radiate in a first frequency band and a plurality of second radiators configured to radiate in a second frequency band, the second frequency band having higher frequencies than the first frequency band. each of the plurality of first radiators includes a plurality of dipole arms. Each of the plurality of dipole arms includes a periodic pattern of inductive choke segments, and each of the dipole arms has a broken peripheral current path.

Abstract: A filter device (130) is formed between an input end (T1) and an output end (T2), and is configured to attenuate a radio frequency signal in a specific frequency band. The filter device (130) includes a dielectric substrate (140) having a multilayer structure, ground electrodes (GND1 and GND2) formed in the dielectric substrate (140), a first coupling line (132) electrically connected to the input end (T1), a second coupling line (134) electrically connected to the output end (T2), and a stub (133) connected to the first coupling line (132) and the second coupling line (134). The first coupling line (132) and the second coupling line (134) are formed in layers different from layers of the ground electrodes (GND1 and GND2). The first coupling line (132) and the second coupling line (134) are disposed in different layers so as to face each other.

Abstract: An antenna structure and an electronic device are provided. The antenna structure includes a first radiating member, a second radiating member, a grounding member, and a capacitance element. The first radiating member includes a first radiating part, a second radiating part, a feeding part, and a grounding part. The second radiating member is coupling to the first radiating member. The second radiating member includes a third radiating part and a main body part that are connected to each other. There is a first predetermined length between a feeding point of the feeding part and an open end of the second radiating part. There is an electrical length between a connection point where the main body part is electrically connected to the capacitance element and an open end of the third radiating part. The electrical length is greater than the first predetermined length.

Abstract: Disclosed is an antenna device that includes a capacitor element, a first coil, a second coil, and a capacitor. One end of the first coil is connected to a feeding point and another end of the first coil is connected to the capacitor element. One end of the second coil is connected to the capacitor element. One end of the capacitor is connected to the second coil and another end of the capacitor is connected to a grounding point.

Abstract: The present disclosure provides an ultra-wideband antenna for a reversible electronic device in a narrow space including: an upper half and a lower half; a hinge connected with the upper half and the lower half; a first RF signal source, loaded on the hinge; an electrical connection structure, placed on one side of the first RF signal source and electrically connected with the upper half and the lower half; a gapped groove, extending inwardly to the electrical connection structure along the outer side of the upper half and the outer side of the lower half; the hinge is spanned on the gapped groove; the hinge excites the gapped groove to form a first ultra-wideband antenna. While realizing the ultra-wideband antennas, it can also integrate with other multiple antennas, and their isolations are better than ?10 dB, which basically meets the antenna performance requirements.

Abstract: An antenna is provided with a wire loop having a tapered end with the antenna perpendicular to a base plate. Insulating rods extend from the plate to lock the loop. Wire radials are directed horizontally and circumferentially from the metal base plate to metal stakes secured in a terrain. The base plate is part of a transmission line assembly that also includes a clamp, an S-shaped plate, an input jack and an L-shaped standoff insulator. The antenna is powered from the input jack to the loop. A beam pattern is generated by the loop section, base plate, wire radials and the Earth. Deviation of the beam pattern depends on soil properties of the terrain. To transfer power when the antenna is mounted on a terrain with unknown dielectric properties; a compensation network is provided.

Abstract: A parallel plate lens including a top plate, a bottom plate, a side-wall coupled to the top plate and the bottom plate to form the parallel plate lens with a cavity, and a plurality of capacitive probe feeds disposed in the cavity at a spacing interval associated with a guided wavelength (?) within the cavity.

Abstract: A non-common-ground bandpass filter circuit with electrostatic discharge (ESD) protection is disclosed. The non-common-ground bandpass filter circuit with ESD protection includes a non-common-ground plane, a dielectric substrate and a conductor. The conductor is disposed above the non-common-ground plane. The dielectric substrate is disposed between the conductor and the non-common-ground plane. The non-common-ground plane at least has a first ground region and a second ground region separated and insulated from each other. The first ground region corresponds to a first terminal of the conductor and the second ground region corresponds to a second terminal of the conductor. When an ESD event occurs on one of the first ground region and the second ground region, the other of the first ground region and the second ground region will not be damaged by the ESD event. The non-common-ground bandpass filter circuit also provides surge protection.

Abstract: The present invention provides an electrical filter device (1) for filtering a common-mode interference between a current source and a load, comprising:—a signal input (E), which comprises at least one first terminal (E1) and can be connected to the current source; —a signal output (A), which can be connected to the load; —a main stage (H0), having a first main inductor (2a), which comprises a coil with a first core (3), the first main inductor (2a) being connected to the first terminal (E1); and—an auxiliary stage (H1), having at least one first anti-interference capacitor (C1) and one first auxiliary inductor (4), the first auxiliary inductor (4) being connected between the first terminal (E1) and the first anti-interference capacitor (C1), the first auxiliary inductor (4) being inductively coupled to the first main inductor (2a).

Abstract: The present disclosure includes an embodiment of a miniaturized antenna system and methods for compact multi-band transmission and reception of radio signals in a high-frequency (HF) band. An embodiment of the antenna system may include a plurality of shortwave antennas arranged in an antenna cluster, one or more controllers, and one or more monitors. The embodiment of the antenna system may allow the antenna cluster to operate effectively without a plurality of switches over a plurality of HF band frequencies. An embodiment of the one or more controllers may include a frequency testing and acknowledgement circuit that may determine and confirm which frequencies are propagating.

Abstract: A communication device includes a ground element, an antenna structure, a first reflector, a second reflector, a first tuning element, and a switch element. The first reflector is disposed adjacent to the antenna structure. The second reflector is disposed adjacent to the antenna structure. The second reflector is separate from the first reflector. The switch element is coupled to the first tuning element. When the switch element is enabled, the switch element couples the first tuning element to the first reflector or the second reflector. When the switch element is disabled, the first tuning element is separate from the first reflector and the second reflector.

Abstract: An information handling system to wirelessly transmit and receive data may include a processor; a memory; an input/output (I/O) device; a wireless adapter; a metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover to emit a target radio frequency (RF), including: a slot formed around an operative antenna portion of the speaker grill forming a peninsula of the speaker grill in the C-cover; an antenna cavity formed on a back side of the peninsula, the antenna cavity including walls formed around the cavity in the back side of the peninsula; and a tuning module operatively coupled to the speaker grill to excite the speaker grill and dynamically switch frequencies based on the target frequency to be emitted by the speaker grill.

Abstract: A base station antenna that extends along a first longitudinal axis includes a first array configured to emit electromagnetic radiation. The first array includes a first column of radiating elements, the first column including a first radiating element and a pair of second radiating elements. The first radiating element is a cross dipole radiating element and the pair of second radiating elements includes a pair of second radiating elements that are disposed facing each other on both sides of the first longitudinal axis, where each of the second radiating elements includes first and second radiating arms that extend respectively in opposite directions substantially along the first longitudinal axis, and a third radiating arm that extends toward the first longitudinal axis substantially perpendicular to the first and second radiating arms.

Abstract: Provided are an antenna adjustment method, apparatus, and terminal device. The method is applied to a terminal device provided with an antenna, a first feed point, a wireless communication module, and at least two antenna matches, and includes: obtaining a current antenna match connected to the terminal device; determining a communication frequency band in which the terminal device operates; judging whether the communication frequency band corresponds to the current antenna match; determining a target antenna match corresponding to the communication frequency band from the at least two antenna matches if the communication frequency band does not correspond to the current antenna match; and adjusting the antenna according to the target antenna match to cause the antenna to support the communication frequency band, wherein the antenna is connected to a signal transmitting and receiving interface of the wireless communication module through the first feed point to perform signal reception or transmission.

Abstract: An electronic device may include a circuit board, radiators disposed on the circuit board, and provided with a first feeding signal to transmit or receive a wireless signal in a first frequency, band; and a ground disposed on the circuit board to provide a reference potential for the radiators. The radiators and a whole or a portion of the ground may be provided with an additional feeding signal to transmit or receive a wireless signal in various frequency bands that are lower than the first frequency band.

Abstract: An information handling system to wirelessly transmit and receive data includes a processor; a memory; a wireless adapter for transceiving wireless communications via radiofrequency (RF) waves a metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover, the speaker grill including: a slot formed around a portion of a perimeter of the speaker grill that physically separates the portion of the speaker grill from the C-cover; a shunt formed at a distance along the slot creating a first portion of the slot and a second portion of the slot; a forked antenna element wherein: a first tine of the forked antenna is operatively coupled to the first portion of the slot to excite the first portion of the slot; and a second tine of the forked antenna is operatively coupled to the second portion of the slot to excite the second portion of the slot.

Abstract: An electronic apparatus includes: a first antenna board having a plate shape and extending with a first length; a second antenna board having a plate shape and extending with a second length; and a rectangular parallelepiped upper casing for accommodating the first antenna board and the second antenna board. The first antenna board and the second antenna board are arranged such that a longitudinal direction of the first antenna board and a longitudinal direction of the second antenna board are parallel to one side of one main surface of the rectangular parallelepiped upper casing. The first antenna board and the second antenna board are arranged parallel to each other.

Abstract: An antenna system for a portable wireless communication device is provided having a first antenna and a second antenna, the first and second antennas being proximally located causing electromagnetic coupling therebetween. An isolator is coupled with the first and second antennas and the first and second RF transceivers at respective interface ports. The isolator Comprises a radio frequency (RF) coupler featuring four RF coupler ports. The four RF coupler ports are coupled to respective phasor-shaping networks at each of the four RF coupler ports. The first and second RF transceivers operate independently in respective frequency bands.

Abstract: An antenna module includes a first antenna and a second antenna. The first antenna forms multiple operating states. By switching the multiple operating states, the first antenna supports an LTE low frequency of 698-960 MHz and an LTE medium-high frequency of 1710-2690 MHz, and supports multi-carrier aggregation in the band. In each operating state, the first antenna also operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz, the second antenna operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz and a new TDD-LTE band of 5150-5925 MHz. The first antenna and the second antenna together form a 2×2 MIMO of 5G bands of 3300-3800 MHz and 4800-5000 MHz. The antenna module provided by the disclosure has better communication performance.

Abstract: The present invention is an apparatus and method for provisioning a compact power filter connection to a well-grounded connector in such a way as to include a capacitive and inductive circuit connection, extremely near the connector and filter, such that EMC compatibility is created in a space roughly 30% of traditional mechanisms and design approach to satisfy the aforementioned needs, provide the previously stated objects, include the above-listed features, and achieve the already articulated advantages. The present invention is carried out in a “post-internal ferrite bead re-radiation noise-less” manner, in a sense that ability to have noise introduced back onto a post-ferrite bead line has been greatly reduced.

Abstract: In order to implement an external antenna of a radio device with a simple configuration, an antenna according to the present invention includes: a conductor plate; a first linear conductor including a portion disposed substantially in parallel to an edge of the conductor plate, and being curved halfway and connected to the conductor plate with a gap being interposed; a second linear conductor intersecting with a line extending from an end of the first linear conductor opposite to a connection end thereof connected to the conductor plate, and being connected to the conductor plate; a third linear conductor being connected to an end of the second linear conductor opposite to an end thereof connected to the conductor plate, and being disposed substantially in parallel to the first linear conductor; and a fourth linear conductor being disposed in a direction apart from the conductor plate at an end of the third linear conductor opposite to an end thereof connected to the second linear conductor.

Abstract: An antenna unit includes a conductive ground plate, a first antenna element, and a second antenna element. The first antenna element includes a first end connected to a feedpoint and a second end containing an open end. A part of the first antenna element is disposed along the conductive ground plate. The second antenna element branches off the first antenna element at a branch point on the first antenna element. The second antenna element is disposed between the part of the first antenna element disposed along the conductive ground plate and the conductive ground plate. The first antenna element resonates at a first frequency. The second antenna element and a segment between the first end and the branch point of the first antenna element resonate at a second frequency that is higher than the first frequency.

Abstract: A first antenna element includes a first end connected to a feedpoint, a second end connected to a connection point on a ground conductor, and a fold disposed between the first and the second ends. A part of a segment between the first end and the fold of the first antenna element is disposed along the ground conductor. A second antenna element branches off the first antenna element. The second antenna element is disposed between the part of the first antenna element disposed along the ground conductor and the ground conductor. The segment between the first end and the fold of the first antenna element resonates at a first frequency. The second antenna element and a segment between the first end and a branch point of the first antenna element resonate at a second frequency that is higher than the first frequency.

Abstract: An antenna is disclosed wherein a plurality of antennas are combined in a single housing, whereby antenna radiation performance can be improved by increasing frequency bandwidth while minimizing signal interference between antennas. The antenna has a case, a housing, a circuit board, and a base. The case has an open bottom. The housing, formed in a shape corresponding to the interior surface of the case and inserted into the interior of the case, has a plurality of radiating bodies that send and receive signals in a plurality of frequency bands, and a coupling patch that increases frequency bandwidth and minimizes signal interference between radiating bodies. The board is mounted in the case and whereon a feeding pad is furnished that is electrically connected to the radiating bodies. The base is mounted on the board so as to couple to the case and block to open bottom of the case.

Abstract: A multiband antenna, having a reflector, and a first array of first radiating elements having a first operational frequency band, the first radiating elements being a plurality of dipole arms, each dipole arm including a plurality of conductive segments coupled in series by a plurality of inductive elements; and a second array of second radiating elements having a second operational frequency band, wherein the plurality of conductive segments each have a length less than one-half wavelength at the second operational frequency band.

Abstract: An antenna structure includes a substrate, a radiation element, a conducting element, a grounding element, a first inductor, a second inductor, and a feeding element. The radiation element is disposed on the substrate. The radiation element includes a first radiation portion, a second radiation portion, a third radiation portion, and a feeding portion connected between the first radiation portion, the second radiation portion, and the third radiation portion. The conducting element is disposed on the substrate. The conducting element connects with the feeding portion. The grounding element and the feeding portion are separated from each other. The first inductor is disposed on the substrate, and coupled between the conducting element and the grounding element. The second inductor is disposed on the substrate, and coupled between the conducting element and the grounding element.

Abstract: A method, for realizing wireless link processing, a base station and a terminal are disclosed. The method includes: a first communication node receiving reference information from a second communication node and determining link information for performing wireless link communication; and the first communication node communicating with the second communication node according to the determined link information. In the technical solution of the present document, the link information for performing the wireless link communication is determined according to the reference information of the second communication node as a receiving party, to realize that the first communication node communicates with the second communication node according to the determined link information.

Abstract: Embodiments described herein provide various designs of multi-frequency radio frequency identification (RFID) tags which are compact in size and tamper-proofing. In one aspect, a proposed multi-frequency RFID tag includes both a high frequency (HF) subsystem and an ultra high frequency (UHF) subsystem. The HF subsystem and the UHF subsystem share a common integrated circuit (IC) chip and a common substrate. The HF subsystem further includes a HF loop antenna coupled to the IC chip. The UHF subsystem further includes a coupling antenna electrically coupled to the IC chip but electrically isolated from the HF loop antenna. The UHF subsystem also includes an UHF antenna having a region for receiving the RFID module. When the RFID module is positioned within the receiving region of the UHF antenna, the UHF antenna is coupled to the IC chip in the RFID module via the coupling antenna, thereby forming the UHF subsystem.

Abstract: An active antenna associated device and system, and a transmitting and receiving calibration method, used for implementing extensible design of an antenna array, reducing construction implementation difficulty, and ensuring construction implementation reliability. The active antenna unit comprises: N active antenna arrays, a main calibration coupling circuit unit, a transmitting and receiving calibrating unit, a calibration parameter storage unit, and a radio over fiber (ROF) photoelectric conversion unit, wherein N is larger than 1. Each active antenna array at least comprises an antenna calibration coupling circuit unit and M antenna oscillators connected to the antenna calibration coupling circuit unit, wherein M is larger than 1. The antenna calibration coupling circuit units of the active antenna arrays are connected to the main calibration coupling circuit unit through a calibration radio frequency channel.

Abstract: A composite antenna includes: a coil element which is formed into a spiral shape, and which has a trap coil portion in a base end portion; a tubular conductive element which is electrically series-connected to a base end of the coil element; and a connection metal fitting which is electrically connected to a base end of the conductive element. A series connection of the coil element and the tubular conductive element operates in a first frequency band, and the tubular conductive element alone operates in a second frequency band which is higher than the first frequency band.

Abstract: An apparatus comprising: a first feed point (26) coupled to a first conductive member (30), the first conductive member being coupled to a ground member (46) in at least two places, the first conductive member and ground member defining a first perimeter (50), wherein the first conductive member and at least a portion of the ground member are configured to resonate at least partially in a first operational frequency band; and a second feed point (28) coupled to a second conductive member (32), the second conductive member being disposed within the first perimeter, the second conductive member and at least a portion of the ground member defining a second perimeter (52) which is smaller than the first perimeter, and being configured to resonate in a second operational frequency band, different to the first operational frequency band.

Abstract: Examples of techniques for antenna ground and feed swapping in handheld applications are described. A condition with respect to wireless communication of a handheld apparatus having one or more antennas may be detected in determining whether to operate the handheld apparatus in a first mode or a second mode of wireless communication. In response to a determination to operate the handheld apparatus in the first mode, a first feeding port and one or more first shorting ports may be electrically connected to at least one antenna of the one or more antennas each disposed adjacent a first distal end of the handheld apparatus. Alternatively, in response to a determination to operate the handheld apparatus in the second mode, a second feeding port and one or more second shorting ports may be electrically connected to at least one antenna or another antenna of the one or more antennas.

Abstract: A millimeter-wave transmission device including a waveguide made of a material having a dielectric constant in the range from 1 to 4, the waveguide being solid at each of its ends with an electronic unit embedded in the material of the waveguide, the electronic unit including a millimeter wave transceiver circuit, an antenna capable of transmitting and receiving the millimeter waves, a modulation-demodulation circuit, and input-output conductors.

Abstract: A consumption meter for measuring consumption data of a supplied utility is provided, the consumption meter comprising: a housing with an opening, where the housing forms a closed compartment when the opening of the housing is closed with a cover; a communication module provided in the closed compartment; a front plate provided in the closed department and arranged adjacent to the cover, wherein the front plate has a first front plate surface facing the cover, and a second front plate surface facing opposite; and an antenna comprising an antenna body with an antenna conductive element, which is connected to the communication module; wherein the front plate has an indentation arranged between the first and the second front plate surfaces, and wherein the antenna body is arranged in the indentation. The consumption meter provides an antenna with a high transmission performance.

Abstract: An antenna (100) with an embedded wideband matching substrate (102) is provided. The substrate (102) comprises impedance matching circuitry (300) providing a low frequency (LF) matching circuit (330) and a high frequency (HF) matching circuit (340) for tri-band operation. A stripline (314) having a stripline ground (324) is disposed on the substrate. The stripline (314) provides a matching element and the stripline ground (324) provides a common ground (324) for both the HF and LF matching circuits. The substrate (102) is shaped with a tabular portion (106) which facilitates encasing the substrate (102) within a casing (118). The tabular portion (106) further provides an alignment feature for wrapping of a flexible radiating element about the casing and flexible antenna rod (126) to complete the antenna structure (100).

Abstract: The present invention relates to a small cobra antenna that has a high performance as an antenna gain, and minimizes the effect of the length of the coaxial wire. An antenna element and a coaxial wire are connected to a junction that is a feeding point. The antenna element has a length corresponding to the frequency of a broadcast wave to be received. Further, a ferrite core is positioned at a location a length identical to the length of the antenna element away from the junction. The coaxial wire is wound around the ferrite core about once to three times. A high frequency interrupting part for interrupting the high-frequency current from the coaxial wire is provided at the front side of a connecter of a receiver to which the other end of the coaxial wire is connected.

Abstract: An antenna of the present invention includes a laminate body including a conductor core, an insulator layer, and a conductor pattern. The conductor pattern is a conductor layer formed of a conducting body disposed on a radially outer side of the insulator layer. The conductor core and the conductor pattern are connected to each other in such a manner that a current is made to flow in a direction from the conductor core to the conductor pattern or in a direction opposite thereto so as to coincide with a power supply direction.

Abstract: An antenna structure includes a feeding portion, a first grounding portion, a second grounding portion, a first loop antenna and a second loop antenna. The feeding portion has a first side and a second side parallel to the first side. The first grounding portion is positioned adjacent and apart from the first side of the feeding portion. The second grounding portion is positioned adjacent and apart from the second side of the grounding portion. The first loop antenna is defined to accept a second loop antenna therein, and is electronically coupled to the first and second grounding portions. The second loop antenna is positioned inside and apart from the first loop antenna, and further electronically coupled to the feeding portion.

Abstract: An antenna reconfigurable circuit changes patterns of a multiple-antenna system and includes a feed portion which an electrical signal is fed to; a plurality of power distribution links coupled between the feed portion and the antennas to form therebetween paths of transmission of the electrical signal; and switching units disposed at the power distribution links, respectively, to selectively disable or enable the paths. The switching units enable the antennas to change patterns and enhance signal reception quality. Furthermore, the antenna reconfigurable circuits are printed circuits instead of lumped elements and thereby maintain response characteristics, response stability and production yield of the antenna reconfigurable circuits.

Abstract: An antenna structure includes a metal member, an extending section, and a metal sheet. The metal member defines a gap. The gap divides the metal member into a first portion and a second portion. The extending section is connected to the first portion of the metal ember to cooperatively form a first antenna. The first antenna, the metal sheet and the second portion of the metal portion cooperatively form a second antenna.

Abstract: A UHF/VHF/FM antenna consisting of two elongated octagonal elements formed individually from ¼? O.D. (Outer Dimension) flexible copper tubing, interlaced with each other before coupling of the open tubing ends, then concentrically aligned perpendicular to each other, and soldered at a interlacing cross points. Signals received by the interlaced elements are directed to a 300-75 ohm transformer balun through two bare 12-guage copper wires, each bent approximately 90°, then soldered to the mid-points of adjacent element short sides and perpendicular element cross points.

Abstract: An antenna including a ground plane, a broadband radiating element mounted on the ground plane and including a feed point, the feed point having a first impedance, a feed for feeding the broadband radiating element at the feed point, the feed having a second impedance and a ground leg extending between the broadband radiating element and the ground plane for impedance matching the first impedance to the second impedance, the ground leg being capacitively coupled to the broadband radiating element.

Abstract: An antenna includes a first antenna section that can be joined to an antenna feed. The first section has conductive elements in series with reactive loads. The reactive loads are positioned with a regular spacing. The reactive loads and spacing are optimized for operation of the first section at the highest frequency. Additional antenna sections having successively lower frequencies are joined in series to the first antenna section. Each additional section has conductive elements joined in series with reactive loads at a particular spacing. The additional sections spacing and reactive loads are provided to work in conjunction with the higher frequency antenna sections to optimize the antenna for an additional frequency. A method for making such an antenna is further provided.

Abstract: An antenna structure includes a feed end, a first radiator plate, a second radiator plate, a third radiator plate, a first ground end, and a second ground end. The first radiator plate and the third radiator plate are coupled to the feed end. The second radiator plate is coupled to the first radiator plate. The first ground end and the second ground end are disposed on the third radiator plate and are spaced from the first ground end. The first ring portion is coupled to the first radiator plate, the second radiator plate, and the third radiator plate.

Abstract: Combination antenna, which comprises two different antenna parts, of which the first antenna part is fitted to operate at a lower frequency range and the second antenna part is fitted to operate at a higher frequency range. The second antenna part of the combination antenna is arranged above the first antenna part. The supply cable of the second antenna part (102) of the combination antenna is arranged to travel in connection with the first antenna part. The first antenna part comprises two or more radiator parts (104, 106, 108) and also coils (112) between them, wherein the coil or coils (112) are formed from the supply cable of the second antenna part (102).

Abstract: An antenna apparatus may include a conductor layer having an aperture and a slit that adjoins the aperture; and a resonance tuning component including a first element, a second element, and a third element coupled with the first and second elements. The slit may have an opening at a periphery of the conductor layer. A first gap may be arranged between the first element and the conductor layer. At least a part of the first element may be coupled with the conductor layer. A second gap may be arranged between the second element and the conductor layer. The antenna apparatus may include a capacitor and an inductor. The capacitor may be connected with the inductor in parallel between the first element and the conductor layer. The terminal device may include the antenna apparatus.

Abstract: Both ends of a feeder and both ends of a reflector of an antenna device are connected using a pair of diodes. When the diodes are turned on, a loop antenna is formed which loops the feeder, the diode, the reflector, a capacitor, and the diode, and the antenna device operates as the loop antenna. When the diodes are turned off, the antenna device operates as a Yagi-Uda antenna which is formed of the feeder, the reflector, and a wave guide.

Abstract: The present invention discloses an antenna and pertains to the field of communications technologies. The antenna includes: a printed circuit board, a first antenna feeding structure, a first antenna loading structure, and a first filter, where the first antenna feeding structure has a grounding pin and a feeding pin, the grounding pin and the feeding pin are separately connected to the printed circuit board, and the first antenna loading structure and a partial structure of the first antenna feeding structure form a coupling structure; and the first antenna loading structure is connected to the first filter, the first filter is connected to the printed circuit board, and the first filter is configured to cut off a low-frequency current. A low-frequency current is cut off by using a filter, so as to implement selective filtering for an antenna loading structure and extend operating bandwidth of the antenna.

Abstract: A square bracket-shaped radiation element is in a non-ground region of a board. A first reactance element that equivalently enters a short-circuited state in a second frequency band is connected between a second end of the radiation element and a ground conductor. A second reactance element that equivalently enters a short-circuited state in a first frequency band s connected between a first end of the radiation element and the ground conductor. In the UHF band, the radiation element and the ground conductor function as an inverted F antenna that contributes to field emission. In the HF band, a loop including the radiation element and the ground conductor functions as a loop antenna that contributes to magnetic field emission.