An antenna apparatus includes an antenna, a first matching circuit and a second matching circuit, which are connected to the antenna, and an antenna switching apparatus, which is connected to the first matching circuit and the second matching circuit. Within the same time, only one of the first matching circuit and the second matching circuit is in operation. Operating frequency-band signals of the first matching circuit and the second matching circuit on the antenna are switched by the antenna switching apparatus, so as to be used at staggered times, thereby ensuring that operating frequency-band signals of the first matching circuit and the second matching circuit can be normally used in different scenarios, and effectively improving a performance of the antenna.

An antenna apparatus includes an antenna, a first matching circuit and a second matching circuit, which are connected to the antenna, and an antenna switching apparatus, which is connected to the first matching circuit and the second matching circuit. Within the same time, only one of the first matching circuit and the second matching circuit is in operation. Operating frequency-band signals of the first matching circuit and the second matching circuit on the antenna are switched by the antenna switching apparatus, so as to be used at staggered times, thereby ensuring that operating frequency-band signals of the first matching circuit and the second matching circuit can be normally used in different scenarios, and effectively improving a performance of the antenna.

An antenna assembly includes a first antenna and a second antenna. The first antenna includes a first radiator, a first signal-source, a first matching circuit, and a first adjusting circuit. The first signal-source is electrically connected to the first matching circuit to the first radiator, and the first adjusting circuit is configured to adjust a resonant frequency-point of the first antenna to make the first antenna support an electromagnetic wave signal in a first frequency band. The second antenna includes a second radiator, a second signal-source, a second matching circuit, and a second adjusting circuit. The second signal-source is electrically connected to the second matching circuit to the second radiator, the second adjustment circuit is configured to adjust a resonant frequency-point of the second antenna to make the second antenna support an electromagnetic wave signal in a second frequency band and a third frequency band.

An antenna assembly includes a first antenna and a second antenna. The first antenna includes a first radiator, a first signal-source, a first matching circuit, and a first adjusting circuit. The first signal-source is electrically connected to the first matching circuit to the first radiator, and the first adjusting circuit is configured to adjust a resonant frequency-point of the first antenna to make the first antenna support an electromagnetic wave signal in a first frequency band. The second antenna includes a second radiator, a second signal-source, a second matching circuit, and a second adjusting circuit. The second signal-source is electrically connected to the second matching circuit to the second radiator, the second adjustment circuit is configured to adjust a resonant frequency-point of the second antenna to make the second antenna support an electromagnetic wave signal in a second frequency band and a third frequency band.

An electronic device may be provided with a first antenna fed by a first path and a second antenna fed by a second path. A first coupler may be disposed on the first path, a second coupler may be disposed on the second path, and a feedback path may couple the couplers to a receiver. A low-pass filter may be disposed on the second path. The first antenna may transmit signals in a low band. Some of the signals may couple onto the second antenna. The second coupler may pass the coupled signals to the receiver. Control circuitry may generate a scattering parameter value characterizing the coupling of the signals from the first antenna onto the second antenna. The scattering parameter value may be used to determine when to switch the first antenna out of use and the second antenna into use for covering the low band.

A printed circuit board (PCB) assembly supports selecting alternate printed antenna geometries of an antenna by selectively placing common PCB components (for example, zero-ohm resistors) on the PCB. The desired zero-ohm resistors may be placed using automated part placement equipment commonly used to place surface mount components. The configurable antenna comprises at least one antenna section having a plurality of antenna components. Zero-ohm resistors are selectively placed in series along the antenna section to couple the desired conductor components when manufacturing the PCB assembly. With some embodiments, a configurable antenna includes a low frequency antenna section that may be selectively coupled with a high frequency antenna section antenna through one or more zero-ohm resistors, where each antenna section has a plurality of antenna components. With this approach, a common printed circuit board may be used to support a plurality of antenna variations spanning different frequency bands.

A printed circuit board (PCB) assembly supports selecting alternate printed antenna geometries of an antenna by selectively placing common PCB components (for example, zero-ohm resistors) on the PCB. The desired zero-ohm resistors may be placed using automated part placement equipment commonly used to place surface mount components. The configurable antenna comprises at least one antenna section having a plurality of antenna components. Zero-ohm resistors are selectively placed in series along the antenna section to couple the desired conductor components when manufacturing the PCB assembly. With some embodiments, a configurable antenna includes a low frequency antenna section that may be selectively coupled with a high frequency antenna section antenna through one or more zero-ohm resistors, where each antenna section has a plurality of antenna components. With this approach, a common printed circuit board may be used to support a plurality of antenna variations spanning different frequency bands.

An apparatus, including: an antenna interface, comprising: a first transformer including a first transmission line coupled to a second transmission line, wherein the first transmission line includes first and second ends configured to couple to a first communication device and a reference potential electrode, respectively, and wherein the second transmission line includes first and second ends configured to couple to an antenna and a second communication device, respectively; and a second transformer including a third transmission line coupled to a fourth transmission line, wherein the third transmission line includes first and second ends configured to couple to the first communication device and the reference potential electrode, respectively, and wherein the fourth transmission line includes first and second ends configured to couple to the second communication device and a ballast load, respectively.

An antenna tuning circuit is disclosed. The antenna tuning circuit is configured to make multiple estimates on an antenna impedance at an antenna port and determine an optimum tuning state for antenna tuning based on the antenna impedance estimates. The antenna tuning circuit may be further configured according to various embodiments of the present disclosure to minimize impedance estimation error, reduce magnitude and/or phase disturbance during antenna tuning, and extrapolate antenna impedance estimates for both transmit and receive frequencies. As a result, the antenna tuning circuit can accomplish autonomous antenna tuning optimization to thereby improve transmit and receive performance in a wireless communication device.

Systems and methods for tuning multiplexer filters are disclosed. In one aspect, a multiplexer includes a first filter coupled to a common node, the first filter configured to pass a first band, a second filter coupled to the common node, the second filter configured to pass a second band, and at least one electrical component configured to generate a notch at a frequency between the first band and the second band.