Abstract: A handheld electronic device may be provided that contains wireless communications circuitry. The handheld electronic device may have a housing and a display. The display may be attached to the housing a conductive bezel. The handheld electronic device may have one or more antennas for supporting wireless communications. A ground plane in the handheld electronic device may serve as ground for one or more of the antennas. The ground plane and bezel may define a opening. A rectangular slot antenna or other suitable slot antenna may be formed from or within the opening. One or more antenna resonating elements may be formed above the slot. An electrical switch that bridges the slot may be used to modify the perimeter of the slot so as to tune the communications bands of the handheld electronic device.

Abstract: A multi-band antenna includes an insulative supporting member, an antenna stripe comprising a ground element, a first antenna used for wireless wide area net and a second antenna used on wireless local area net, wherein said first antenna comprises a first radiating portion with a horizontal first feeding tab, said first radiating portion is separated from the grounding element, said antenna stripe surrounds the supporting member, said first radiating portion is fixed on the supporting member and covers plural faces of the supporting member.

Abstract: A multi-frequency antenna A multi-frequency antenna comprising: a radiating patch having a first radiating element and a second radiating element; a grounding patch spaced apart from the radiating patch; a connecting element comprising a first connecting arm and a second connecting arm; a feeding line comprising an inner conductor and an outer conductor; wherein the first connecting arm connecting to the radiating patch and the second connecting arm connecting to the grounding patch; the first connecting arm locating in a first plane is perpendicular to the second connecting arm locating in a second plane.

Abstract: An antenna module and an electronic device using the same. The antenna module includes a metal body bent from a I strip metal sheet. The metal body includes a first connecting part, a second connecting part and a plurality of bending parts. The first connecting part and the second connecting part are coupled to a circuit board. The bending parts are formed between the first connecting part and the second connecting part.

Abstract: Disclosed is a multi-band antenna unit of a mobile terminal that includes an antenna, switch, sensor, first matching circuit, second matching circuit, diplexer, first signal processing unit, and second signal processing unit. The antenna is movably installed between first and second contacts, and transmits and receives first and second signals of different frequency bands. The switch connects the first contact to the first matching circuit or the second contact through the second matching circuit. The sensor detects an antenna position, and allowing selective connection of first or second matching circuits. Transmission and reception of multiple signals of various frequency bands is enabled using a single antenna unit, reducing the number of components, cost, and size of a mobile terminal. Additionally, performance of an antenna is improved by connecting to a proper matching circuit according to the position of the antenna.

Abstract: A low cost and multi-featured antenna is disclosed. The antenna employs a radiating element mounted to a ground plane and having first and second branches spaced above the ground plane forming a generally L shaped planar radiating structure. The antenna can be either linear or circular polarization, and can be either single band or dual band, and only one feeding port is needed to obtain circular polarization. The antenna can be easily applied to various frequency bands.

Abstract: A multiband antenna includes a first antenna unit and a second antenna unit. The first antenna unit includes a first radio member and a second radio member connected to the first radio member. The second antenna unit includes a third radio member and a fourth radio member connected to the third radio member. The first antenna unit receives/sends wireless signals at relatively higher frequencies; the second antenna unit receives/sends wireless signals at relatively lower frequencies.

Abstract: An improved tunable antenna of planar construction is distinguished by the following features: in plan view perpendicular to the effective surface (7), the electrically conductive structure (13, 113) completely or partially covers the effective surface (7), the electrically conductive structure (13, 113) is coupled and/or connected galvanically or capacitively or serially and/or with interposition with at least one electrical component (125) with the ground surface (3) and/or a chassis (B) located on a potential or ground.

Abstract: An antenna for a wireless communication may include a ground plane provided on a carrying structure, a feed element, and a radiating element coupled to the feed element, the radiating element being substantially parallel to and vertically displaced from the ground plane by the feed element and a shortening element. The antenna may also include a parasitic element provided directly on the carrying structure as part of the carrying structure ground layer.

Abstract: A multi-band antenna includes a radiating element having at least two frequency bands and comprising a gap on one side edge thereof, a grounding element coupling and being perpendicular to said radiating element, and a reactance assembled to said radiating element and received in said gap.

Abstract: An antenna includes a base plate, a grounding component, a feed-in conductor, a first controlling unit and a second controlling unit. The base plate includes a first surface and a second surface. The grounding component is provided on the first surface and includes a first part, a second part and a notch formed between the first part and the second part. The feed-in conductor is provided on the second surface and includes a first conducting part. The first conducting part extends across the notch, and is coupled to the first part. The first controlling unit is provided on the second surface and includes a first wire. The first wire extends across the notch, and is coupled to the first part. The second controlling unit is provided on the second surface and includes a second wire. The second wire extends across the notch, and is coupled to the first part.

Abstract: The invention relates to a dual-feed antenna. The dual-feed antenna includes a substrate, a first antenna unit and a second antenna unit. The second antenna unit includes a second radiating unit and a second grounding unit. The second radiating unit includes a second radiator which has a first groove. The first groove has a first bottom and a pair of first arms. The second grounding unit includes a first sub-grounding-area and a second sub-grounding-area. The second sub-grounding-area has a second groove which includes a second bottom and a pair of second arms. The first sub-grounding-area is cross-wise connected with the second sub-grounding-area at the bottom of the groove, and the second arms symmetrically distribute to both sides of the first sub-grounding-area, and the first groove has an opening direction opposite to the opening direction of the second groove.

Abstract: There are provided a plurality of connection auxiliary means 12 electrically connected to an end portion of a central conductor 8 of a coaxial track 5 on a side of a patch conductor 3, and radiately extending toward an edge portion of a penetrating hole 7 on a side of the patch conductor 3. The plurality of connection auxiliary means 12 are fitted to or electrically connected to the edge portion of the penetrating hole 7 with an electrically conductive adhesive.

Abstract: The present invention discloses a multi-band antenna. The antenna includes a ground portion, a parasitic unit connecting with the ground portion and operated at a first frequency band, a first radiation portion having a feeding point and operated at a second frequency band, a second radiation portion connecting with the feeding point and operated at a third frequency band. The first radiation portion and the second radiation portion are located between the parasitic unit and the ground portion.

Abstract: The present invention comprises an antenna device for a portable radio communication device operable in at least a first and a second frequency band. The antenna device comprises a first electrically conductive radiating element having a feeding portion connectable to a feed device (RF) of the radio communication device for feeding and receiving radio frequency signals, a first ground plane portion arranged at a distance from the first radiating element, a second ground plane portion, and a controllable switch arranged between the first and second ground plane portion for selectively interconnecting or disconnecting the first and second ground plane portion.

Abstract: An antenna 1 which is incorporated in a multilayer wiring board 2 has: radiating elements 11-1, 11-2, 11-3, and 11-4 which are laid on faces of A-, B-, and C-layers of the wiring board 2, respectively; power supplying portions 12-1, 12-2, 12-3, and 12-4 which are laid on the faces of the layers, respectively to supply an electric power to the radiating elements 11-1, 11-2, 11-3, and 11-4; short-circuiting portions 13-1, 13-2, 13-3, and 13-4 which are laid on the faces of the layers, respectively to ground the radiating elements 11-1, 11-2, 11-3, and 11-4; and a connecting portion 14 which penetrates the A-, B-, and C-layers of the wiring board 2, and through which the power supplying portions 12-1, 12-2, 12-3, and 12-4 are electrically connected to each other.

Abstract: An antenna (10) comprises a substrate (11) having a first and a second opposed side (12,13); a single element for radiating electromagnetic waves (15), wherein the radiating element (15) is formed on the first substrate side (12); a first ground plane (18) formed on the first substrate side (12), the first ground plane (18) being electrically connected to the radiating element (15); and, a second ground plane (19) formed on the second substrate side (13), the second ground plane (19) being electrically connected to the first ground plane (18).

Abstract: An antenna has a flat support and two separate and flat emitter sections for transmitting or receiving high-frequency signals flatly fixed to the support. One of the emitter sections is flat and areal and the other of the emitter sections is a meander. A coil is fixed flatly on the support and connected to both of the emitter sections, and a ground terminal is also fixed flatly on the support.

Abstract: A multiband antenna with the broadband function has a radiator, a feed cable, a first extension conductor, and a second extension conductor. The radiator has a microwave substrate, a coupling conductor, a first conductor, a second conductor, a third conductor, and a connecting conductor. The coupling conductor is connected with a positive signal wire of the feed cable. The third conductor is connected with a negative signal of the feed cable for transmitting electrical signals. The radiator generates the multiband mode of the antenna. By connecting the first extension conductor and the second extension conductor with the radiator, the surface current distribution and impedance variation of the antenna can be effectively adjusted to achieve the broadband effect.

Abstract: A mobile wireless communications device may include a portable housing, a dielectric substrate carried by the portable housing having a front side facing toward a user and a back side opposite the front side, and a ground plane carried by the dielectric substrate. The device may further include at least one circuit carried by the dielectric substrate, and an antenna carried by the dielectric substrate adjacent an end thereof and electrically connected to the at least one circuit. A ground patch may be adjacent the front side of the dielectric substrate that is electrically connected to the ground plane and spaced apart from and at least partially overlapping the antenna.

Abstract: There is provided a broadband antenna including: an insulating block having opposing first and second main surfaces and a side surface between the first and second main surfaces; a first radiator pattern formed on the first main surface and having a tapered slot with an open end; and a second radiator pattern including two patterns connected to opposing ends of the first radiator pattern, respectively, and extending to the second main surface.

Abstract: An antenna component (and antenna) with a dielectric substrate and a plurality of radiating antenna elements on the surface of the substrate. In one embodiment, the plurality comprises two (2) elements, each of them covering one of the opposite heads and part of the upper surface of the device. The upper surface between the elements comprises a slot. The lower edge of one of the antenna elements is galvanically coupled to the antenna feed conductor on a circuit board, and at another point to the ground plane, while the lower edge of the opposite antenna element, or the parasitic element, is galvanically coupled only to the ground plane. The parasitic element obtains its feed through the electromagnetic coupling over the slot, and both elements resonate at the operating frequency. Omni-directionality is also achieved. Losses associated with the substrate are low due to the simple field image in the substrate.

Abstract: An electronic apparatus includes a semiconductor chip 15, a first substrate 10A having an antenna 12 formed on a first face 10a thereof and having the semiconductor chip 15 loaded on a second face 10b thereof, a second substrate 20A on which the first substrate 10A is provided so as to face the semiconductor chip 15, and which is connected to the outside, copper core solder balls 18 electrically connecting the first substrate 10A and the second substrate 20A, and a resin material 30 disposed between the first substrate 10A and the second substrate 20A. The second substrate 20A is provided with a thermal via 27 which radiates the heat in the semiconductor chip 15.

Abstract: An antenna includes a dielectric substrate, a grounding plane, first and second grounding elements, and first and second radiating elements. The grounding plane is formed on the dielectric substrate. The first and second grounding elements are formed on the dielectric substrate, have a curved shape and a size that are identical, and are connected to the grounding plane. The first and second radiating elements are formed on the dielectric substrate, have a curved shape and a size that are identical, are operable in the same frequency range, and are connected to the first and second grounding elements, respectively.

Abstract: This invention refers to an antenna structure for a wireless device comprising a ground plane and an antenna element, wherein the ground plane has the shape of an open loop. The invention further refers to an antenna structure for a wireless device, such as a light switch or a wristsensor or wristwatch, comprising an open loop ground plane having a first end portion and a second end portion, the open loop ground plane defining an opening between the first end portion and the second end portion; and an antenna component positioned within the opening defined between the first end portion and the second end portion and overlapping at least one of the first end portion or the second end portion. Further the invention refers to a corresponding wireless device and to a method for integrating such an antenna structure in a wireless device.

Abstract: The present invention relates to a circularly-polarized dielectric resonator antenna (DRA). The antenna comprises a substrate, a Wilkinson power divider, a phase shifter, a ground plane and a dielectric resonator, wherein the phase shifter is connected to the Wilkinson power divider. Besides, the dielectric resonator is disposed on the ground plane, and includes a dielectric main body and a well disposed above the substrate. Additionally, the antenna is adopted to increase the linear radiation bandwidth by utilizing the well, and transceives a circularly-polarized electromagnetic wave by utilizing the Wilkinson power divider. Consequently, the circularly-polarized dielectric resonator antenna can be applied in the fields of satellite communication, Worldwide Interoperability for Microwave Access (WiMAX), and wireless communication.

Abstract: Disclosed is a planar inverted-F antenna with an extended grounding plane. The planar inverted-F antenna has a grounding metal plate having a selected side edge on which the extended grounding plane is formed and has a predetermined height. At least one antenna signal radiating plate is connected to the grounding metal plate by a short-circuit piece and is substantially parallel to and spaced from the grounding metal plate by a distance. A feeding point extends from the antenna signal radiating plate in a direction toward the grounding metal plate and corresponds to the extended grounding plane with a predetermined gap therebetween. With the arrangement of the extended grounding plane, the impedance matching of the antenna is improved and the impedance bandwidth of the antenna is increased.

Abstract: A multi-layer isolated magnetic dipole (IMD) with improved bandwidth and efficiency characteristics to be used in wireless communications and other applicable systems. The multi-layer IMD antenna comprises an IMD element positioned above a ground plane, a conductive element positioned above a ground plane and coupled to the first portion having one or more slot regions being defined between the IMD element and the conductive element and one or more capacitive elements positioned across the one or more slot regions. The range of frequencies covered to be determined by the shape, size, and number of elements in the physical configuration of the components.

Abstract: To receiving satellite broadcasting waves, it is provided an antenna comprising: a first element connected to a first feed point of a hot side; a ground element connected to a second feed point of a ground side; a second element; and a third element. The second element is arranged substantially in parallel with the first element so as to be coupled to the first element. The third element is arranged to define a predetermined angle with the first element, with a vertex of the predetermined angle set to a vicinity of the first feed point and the second feed point. The first element has a linear shape so as to have an inductive property at a resonance frequency. The third element has a linear shape so as to have a capacitive property at the resonance frequency. The third element is connected to a ground-side end portion of the second element.

Abstract: An antenna structure includes a circuit board with a ground surface and a printed antenna. The printed antenna includes a signal feed-in portion, a first radiating unit connected to the signal feed-in portion and a second radiating unit connected to the first radiating unit and has a plurality of printed layers. The first radiating unit diverges and forms a first radiating element having a first turning portion and a second radiating element at a first end, and the first radiating element and the second radiating element are combined at a second end. The second radiating unit includes a third radiating element, a fourth radiating element, a second turning portion located between the third radiating element and the second end and a third turning portion located between the third radiating element and the fourth radiating element. A distance is formed between the fourth radiating element and the ground surface.

Abstract: A handheld electronic device is provided that contain wireless communications circuitry. The wireless communications circuitry may include antenna structures. A first antenna may handle first and second communications bands. A second antenna may handle additional communications bands. The first and second antennas may be located at opposite ends of the handheld electronic device. Conductive structures in the handheld electronic device may form an antenna ground plane. The antenna ground plane may have portions defining an antenna slot. An L-shaped antenna resonating element may be located adjacent to the slot. In the first communications band, the L-shaped antenna resonating element may serve as a non-radiating coupling stub that excites the antenna slot. In the second communications band, the L-shaped antenna resonating element may transmit and receive radio-frequency signals.

Abstract: An ultra wideband antenna (20) is disposed on a substrate (10). The substrate includes a first surface (101) and a second surface (102). The ultra wideband antenna includes a radiation body (22), a feeding portion (26), and a grounded portion (28). The radiation body disposed on the first surface is used for transceiving electromagnetic signals. The radiation body includes a semicircle-shaped metal portion (222) and a rectangle-shaped metal portion (224) and defines a slot (24) starting at an edge therein. The feeding portion is electronically connected to the radiation body for feeding signals to the radiation body. The grounded portion is disposed on the second surface.

Abstract: An antenna device includes a supporting body and an antenna. The supporting body has two arms and a connecting portion disposed between and connecting the two arms. The antenna has a grounding portion extending from one end of one of the arms. A free end of the grounding portion perpendicularly extends toward the other arm to form a first radiating strip, and a second radiating strip, a third radiating strip and a fourth radiating strip are respectively integrally formed in turn. The first, second, third and fourth radiating strips together define substantially a rectangular shape. A feed-in portion extends from the first radiating strip. The grounding portion connects the supporting body functioning as a ground of the antenna, which increases the area of the grounding for the antenna and enhances the performance of signal transmitting and receiving of the antenna device.

Abstract: According to one embodiment, an antenna device includes a short circuit path, a first open-ended element, a feed side element, a second open-ended element, and a short circuit element. One end of the short circuit path is connected to a ground point near a feed point. The first open-ended element extends from another end of the short circuit path. The feed side element extends from near the feed point in a direction in which the first open-ended element extends with an edge close to ground. The second open-ended element extends from near an end of the feed side element in the direction in which the first open-ended element extends. The short circuit element connects between an end of the first open-ended element and a point on an edge of the feed side element opposite the edge close to the ground or a point on the second open-ended element.

Abstract: The present invention discloses an antenna adapted for use in a wireless network device. The antenna includes a base and two antenna portions. Each antenna portion includes a radiation section and a ground section. The ground sections of the two antenna portions are connected with the same base and substantially perpendicular to the base. The radiation section is connected with the ground section and substantially parallel to the base with a difference in height formed between the radiation section and the base. The antenna is a single component integrally formed by stamping an electrically conductive thin metal plate, which not only facilitates fabrication thereof, but also the assembly of the antenna to a substrate of the wireless network device, thereby increasing the gain of the wireless network device along a vertical direction.

Abstract: A multi-band antenna includes a first radiating portion, a second radiating portion extending perpendicularly from the first radiating portion, a third radiating portion extending perpendicularly from the second radiating portion and located at a same side with respect to the second radiating portion as the first radiating portion, a fourth radiating portion extending perpendicularly from the third radiating portion towards the first radiating portion, a fifth radiating portion in alignment with the first radiating portion, with a feeding portion connecting with the first radiating portion and the fifth radiating portion, a sixth radiating portion extending perpendicularly towards the fourth radiating portion from the fifth radiating portion and spaced away from the fourth radiating portion, and a grounding portion spaced from the first radiating portion, the feeding portion and the fifth radiating portion with a grounding area disposed thereon, and connected with the first radiating portion by a connecting p

Abstract: In some embodiments, a multiband antenna array using electromagnetic bandgap structures is presented. In this regard, an antenna array is introduced having two or more planar antennas situated substantially on a surface of a substrate, a first set of electromagnetic bandgap (EBG) cells situated substantially between and on plane with the antennas, and a second set of EBG cells situated within the substrate below the antennas. Other embodiments are also disclosed and claimed.

Abstract: There is provided with an antenna apparatus, including: a finite ground plate; a plurality of conductor plates arranged along and on both sides of a first gap line or a second gap line that intersect with the first gap line; a plurality of first linear conductive elements configured to connect the finite ground plate with each of the conductor plates; and an antenna element configured to have second and third linear conductive elements arranged in the first gap line and a feeding point that is placed between adjacent ends of the second and third linear conductive elements for supplying electric power from the ends, wherein the feeding point is positioned in an intersection area of the first gap line and the second gap line.

Abstract: The antenna includes a substrate, a radiation part and a ground part. The radiation part is disposed on the substrate. The outside frame of the radiation part is similar to D-type. The radiation part has at least a hole inside. The ground part is also disposed on the substrate. The ground part has at least a hole inside. Positions of a feeding terminal and a ground terminal of the antenna are not limited to center regions of the sides of the radiation part and the ground part.

Abstract: A radio antenna assembly for use in a communication device has an antenna element disposed adjacent to a ground plane to form a physical relationship with the ground plane. A mechanical device is used to change the physical relationship for changing the operating impedance of the antenna element or shifting the frequency band of the antenna assembly. The physical relationship can be changed by mechanically changing the shape of the antenna element. When the antenna element comprises a first radiating element and a second radiating element disposed at a lateral distance from the first radiating element, the physical relationship can be changed by changing the distance. When a physical object is disposed between the antenna element and the ground plane, the physical relationship can be changed by moving or twisting the physical object. The object can be electrically conducting, dielectric or magnetic.

Abstract: A printed antenna (10) disposed on a substrate (90) includes a feeding portion (12), a first radiation portion (16), a second radiation portion (18), a matching portion (14), and a grounded portion. The feeding portion feeds electromagnetic signals. One end of the first radiation portion is electronically connected to the feeding portion, and the other end of the first radiation portion is a free end. One end of the second radiation portion is electronically connected to the feeding portion and the first radiation portion, and the other end of the second radiation portion is a free end. The second radiation portion includes a plurality of radiation segments forming at least one space, and the first radiation portion is accommodated in the space formed by the radiation segments. The matching portion is electronically connected to the feeding portion, for impedance matching. The grounded portion is located adjacent to the feeding portion.

Abstract: A multi-band antenna is provided. The multi-band antenna includes a grounding element, a connecting element, a first radiating element and a second radiating element. The connecting element is connected to the grounding element and extends along a second direction. The first radiating element is connected to the connecting element and extends along the first direction, wherein the first radiating element, the grounding element and the connecting element are disposed on a first plane and have a resonating slot thereamong. The second radiating element is connected to the first radiating element and extends along a second plane to reach a specific distance, and then turns to be extended on a third plane parallel to the first plane, wherein the first plane and the third plane have a resonating region therebetween.

Abstract: A dual-band printed monopole antenna is disclosed. The antenna is in a rectangular structure and comprising: a first radiating unit; a second radiating unit; a matching unit; a first matching unit; a second matching unit; a signal feed-in terminal, and a feed-in signal grounding terminal, whereby its size is effectively minified so as to meet the demand for the application of the minified modern wireless apparatus.

Abstract: An antenna device includes a grounding element and an antenna. The antenna includes a feeding element, first and second radiating elements, and a parasitic element. The first radiating element is coupled to the grounding element. The second radiating element is coupled to the feeding element, is disposed proximate to the first radiating element, and cooperates with the grounding element and the first radiating element to define an area thereamong. The parasitic element is disposed in the area and extends from the grounding element.

Abstract: A single band antenna includes a radiating part, a feeding part and a grounding part. The feeding part is connected with the radiating part. A first separating slot exists between the radiating part and the feeding part. The grounding part is connected with the feeding part. A second separating slot exists between the feeding part and the grounding part. Each of the first separating slot and second separating slot has at least one bend.

Abstract: A method (1400) and an RF circuit (100, 400, 700, 1000, 1100, 1200, 1300) for a wireless communication device that mitigates near field radiation generated by the wireless communication device. At least one counterpoise (104, 404, 1304) can be configured to resonate at or near at least one operating frequency of an antenna (102) of the wireless communication device. The antenna can be a component of the RF circuit. The counterpoise can be electromagnetically coupled to the antenna to mitigate near field radiation of the antenna at the at least one operating frequency of the antenna in order to comply with an applicable hearing aid compatibility (HAC) specification.

Abstract: An antenna device suitable for short distance wireless communication is provided which can have a good symmetry of directional characteristics and increase a gain at both end sides in a longitudinal direction of a ground pattern. An antenna device is formed by patterning a metal conductor on a printed substrate. The antenna device is provided with a ground pattern of a rectangular shape, a power feed element arranged adjacent to one short side portion of the ground pattern, a correction pattern that projects from the short side portion and is located lateral to the power feed element, and a parasitic radiation element extending along the short side portion at a separation position facing the short side portion of the ground pattern through the power feed element and the correction pattern. An electrical length of the parasitic radiation element is set to be approximately ½ of a resonant length. When power is feed, the power feed element is excited to radiate electric waves.

Abstract: An antenna arrangement comprises a central part extending in a first plane, an antenna element comprised in an antenna part, which antenna part and antenna element extend from the central part in a second plane, a first counterpoise part, extending from the central part in a third plane, and a second counterpoise part extending from the central part in a fourth plane, the antenna arrangement is arranged in a functional position. The functional position implying that the folded first and second counterpoise parts together represents a counterpoise and the antenna element resonates together with the counterpoise, thus making the whole antenna arrangement serve as an antenna.

Abstract: The present invention relates to an antenna for WWAN and an integrated antenna for WWAN, WLAN, and GPS. The integrated antenna comprises a ground metal plate, a coupled WWAN antenna, a WLAN antenna, an auxiliary grounding element, and at least one supporting element. The integrated antenna of the invention can be applied to a wireless electronic device with WWAN and WLAN by utilizing the coupled WWAN antenna to induce a WWAN frequency and the WLAN antenna to induce a WLAN frequency. In addition, the ground metal plate and the auxiliary grounding element are selectively connected or not connected to a ground end of the wireless electronic device, and can be separately used to provide grounding effect. Therefore, the integrated antenna can be mounted on any part of the wireless electronic device, and can have stable electrical characteristic.

Abstract: Antennas for electronic devices are provided. First and second antennas may be mounted within an electronic device. Free-space coupling between the first and second antennas may give rise to interference. The first and second antennas may be coupled to a global ground. The global ground may be formed using a conductive member in the electronic device such as a conductive frame member. Signals that pass between the antennas through the global ground may serve as canceling signals that reduce the magnitude of free-space interference signals and thereby improve antenna isolation. The antennas may be coupled to the global ground using electrical paths or through near-field electromagnetic coupling. Coupling efficiency to the global ground may be enhanced by configuring the conductive traces of one or both of the antennas to form a resonant circuit.