An adaptive impedance matching network to implement an impedance match between an RF power device and an antenna comprises a matching network having at least one tunable component, a current sensor providing a current value corresponding to the supply current associated with the RF power device, a power sensor configured to provide an RF power sensor value monotonically related to power delivered to the antenna, and a tuner to provide a tuning signal to the matching network as a function of the current and RF power values. The tuner may adjust the tuning signal so that the RF power sensor value is at least as large as for other settings of the tuning signal, while maintaining the supply current at a predetermined amount corresponding to an amount of supply current occurring when the RF power device is driving a load that produces the desired RF output power and amplifier efficiency.

A wireless signal emitter of a tire pressure detector includes a controller, an antenna, and an impedance matching module. The impedance matching module includes an impedance matching circuit and an impedance adjusting circuit. The impedance matching circuit is electrically connected to the controller. The impedance adjusting circuit is electrically connected to the antenna and the impedance matching circuit. The impedance adjusting circuit includes a switching element electrically connected to the controller. When the switching element receives different signals of the controller, the impedance adjusting circuit switches between two different configurations, so that the impedance matching module has two different impedances, thereby the antenna sends two different radio frequency signals to achieve a purpose of a single tire pressure detector suitable for in-car receivers of different frequencies.

Filter circuitry is used in communication systems that employ multiple antennas. In general, a communication system may have a transmit path and a receive path. The transmit path extends to a first antenna port and is configured to present signals for transmission in a first communication band and a second communication band to the first antenna port for transmission via a first antenna that is coupled to the first antenna port. The receive path extends to a second antenna port and comprises a first multiple passband/multiple stopband filter that provides a plurality of passbands and a plurality of stopbands interleaved with one another, wherein a first stopband and a second stopband of the plurality of stopbands correspond respectively to the first communication band and the second communication band and are separated by a first passband of the plurality of passbands.

Filter circuitry is used in communication systems that employ multiple antennas. In general, a communication system may have a transmit path and a receive path. The transmit path extends to a first antenna port and is configured to present signals for transmission in a first communication band and a second communication band to the first antenna port for transmission via a first antenna that is coupled to the first antenna port. The receive path extends to a second antenna port and comprises a first multiple passband/multiple stopband filter that provides a plurality of passbands and a plurality of stopbands interleaved with one another, wherein a first stopband and a second stopband of the plurality of stopbands correspond respectively to the first communication band and the second communication band and are separated by a first passband of the plurality of passbands.

There is provided a broadband multi-bay antenna array comprising an upper antenna element group and a lower antenna element group. Each of the upper antenna group and lower antenna group comprises a pair of antenna elements separated by a distance of one-half wavelength at mid-band wavelength. Radiating elements of said first antenna in each pair are positioned in a first orientation and radiating elements of said second antenna in each pair are positioned in a second orientation which differs from the orientation of the first antenna by 180 degrees (flipped over). A center feed input port is positioned between the upper antenna element group and the lower antenna element group and is electrically coupled to each of the first, second, third and fourth antenna elements.

An apparatus and associated method are provided involving a housing having a periphery configured to operate as a second antenna, a third antenna, and a fourth antenna. The periphery includes a top wall having a first slot formed therein, a first side wall having a second slot formed therein, and a second side wall having a third slot formed therein. The top wall is arranged between the first side wall and the second side wall, and a top portion of the periphery is defined between the second slot and the third slot. The top portion is divided into a first top side portion and a second top side portion via the first slot. Further, the first top side portion operates as the second antenna, and the second top side portion operates as both the third antenna and the fourth antenna.

An electronic device may have components mounted in a housing. The device may include wireless transceiver circuitry and antenna structures. A display may be mounted in the housing. The display may have a cover layer having an inner surface with a recess. The recess may run along a peripheral edge of the cover layer. An antenna structure such as an inverted-F antenna resonating element may be formed from a metal trace on a dielectric antenna carrier. The resonating element may be mounted in the recess without adhesive. Conductive vias may pass through the dielectric carrier. Metal members with dimples may be soldered to a flexible printed circuit and may be used to ground metal traces on the carrier and the flexible printed circuit to the housing when the carrier is attached to the housing with fasteners.

An electronic device may have components mounted in a housing. The device may include wireless transceiver circuitry and antenna structures. A display may be mounted in the housing. The display may have a cover layer having an inner surface with a recess. The recess may run along a peripheral edge of the cover layer. An antenna structure such as an inverted-F antenna resonating element may be formed from a metal trace on a dielectric antenna carrier. The resonating element may be mounted in the recess without adhesive. Conductive vias may pass through the dielectric carrier. Metal members with dimples may be soldered to a flexible printed circuit and may be used to ground metal traces on the carrier and the flexible printed circuit to the housing when the carrier is attached to the housing with fasteners.

A film antenna comprises an antenna element having a first electrically conductive layer and an adaptation network that is formed by a second conductive layer.

There are disclosed various methods and apparatuses for an antenna. In some embodiments of the method a transmission signal is provided to a first feed point (126) of an antenna (102). A modified signal is generated from the transmission signal and provided to a second feed point (128) of the antenna (102). In some embodiments the apparatus comprises an antenna comprising a first feed point (126) and a second feed point (128). There is also a first interface to provide a transmission signal to the first feed point (126), and a phase shifter (124) for generating a modified signal from the transmission signal. The modified signal is provided to a second feed point (128) of the antenna (102).