A method of manufacturing a ceramic resonator radio frequency filter includes placing one or more first coaxial resonators on a printed circuit board, and placing one or more second coaxial resonators over the one or more first coaxial resonators so that the coaxial resonators are arranged in a stacked configuration on the printed circuit board. The method also includes electrically connecting the one or more first coaxial resonators and second coaxial resonators to the printed circuit board.

A radio frequency module is capable of at least one of simultaneously transmitting, simultaneously receiving, or simultaneously transmitting and receiving a radio frequency signal of a first communication band and a radio frequency signal of a second communication band. The radio frequency module includes: a module board including a first principal surface and a second principal surface on opposite sides of the module board; a first duplexer having, as pass bands, a transmission band and a reception band of the first communication band; and a second duplexer having, as pass bands, a transmission band and a reception band of the second communication band. The first duplexer is disposed on the first principal surface and the second duplexer is disposed on the second principal surface.

A filter device, an RF front-end device and a wireless communication device are provided. The filter device includes a substrate, a passive device and at least one resonance device, wherein the passive device has a first side and a second side opposite to the first side, the substrate is located on the first side, and the at least one resonance device is located on the second side. The RF filter device formed by integrating the resonance device (such as an SAW or BAW resonance device) and the passive device (such as an IPD) can broaden the pass-band width, has a high out-of-band rejection, and occupies less space in an RF front-end chip.

Embodiments of this disclosure relate to bulk acoustic wave resonators on a substrate. The bulk acoustic wave resonators include a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, a conductor electrically connecting the first bulk acoustic wave resonator to the second bulk acoustic wave resonator, and an air gap positioned between the conductor and a surface of the substrate.

Multiplexing circuits with bulk acoustic wave (BAW) resonators as network elements for higher performance are provided. Multiplexing networks which support newer fourth generation (4G) and fifth generation (5G) standards may include a combination of multiplexers having a number of radio frequency (RF) filters connected to an antenna at the same time. One critical aspect of such a multiplexer design is the loading of these filters to each other, in which the static capacitance presented by a filter can be beneficial or detrimental to other filters in the multiplexing network. Aspects of the present disclosure introduce a BAW resonator to improve multiplexing network performance using the frequency-dependent capacitance, resonance, and/or anti-resonance of the BAW resonator.

A radio frequency (RF) module including a module substrate; a filter with a passband including communication band for TDD; a switch connected to the filter; a power amplifier that is arranged on a first surface of the module substrate and connected to the filter via the switch; a low-noise amplifier that is arranged on a second surface of the module substrate and connected to the filter via the switch; a filter with a passband including communication band; a low-noise amplifier that is arranged on the second surface and connected to the filter; and a conductive member arranged between the low-noise amplifiers on the second surface.

The present disclosure relates to a transmitting/receiving device with mobile radio functionality for a motor vehicle, wherein the transmitting/receiving device includes components of: an antenna structure, a high frequency front-end unit coupled to the antenna structure and a computation unit coupled to the high frequency front-end unit. According to the present disclosure, the transmitting/receiving device is configured to additionally process a radar signal using one or more components, wherein the radar signal has a frequency (f2) that differs by less than a factor of five from a mid-frequency (f1) of the electromagnetic waves forming the corresponding mobile radio signal.

A radio frequency circuit includes a transmit power amplifier, a differential transmit signal path having first and second paths, and first and second baluns. The first balun can be configured to convert a single ended transmit signal into a differential transmit signal, and the second balun can be configured to convert the differential transmit signal back to a single ended transmit signal. The circuit can also include a pair of transmit filters between the first and second baluns and including a first transmit filter connected in the first path and a second transmit filter connected in the second path. The second balun cancels harmonic noise generated by the pair of transmit filters.

A film bulk acoustic wave resonator (FBAR) is disclosed with recessed and raised frame portions in the piezoelectric film. The FBAR can include a substrate, the piezoelectric film supported to oscillate in a direction opposite to a main surface of the substrate, and a pair of top and bottom electrodes formed respectively on top and bottom surfaces of the film. The recessed frame portion and the raised frame portion can be formed in the film to extend adjacent to each other along a periphery of an active region of the film oscillating during an operation of the film on a top surface of the top electrode.

A simultaneous client wireless device includes wireless modules configured to perform communication functions of a PHY (physical) layer for wireless radios operable in different bands. The simultaneous client wireless device also includes a communication module configured as an intermediate layer between the PHY layer of the wireless modules and a network layer. The communication module is configured to use an application programming interface to retrieve information from the PHY layer and write information to the PHY layer of the wireless modules, perform communication functions of upper MAC (media access control) and lower MAC layers for the wireless bands, and manage simultaneous communications over the wireless bands. The communications over the wireless bands can use a local area network protocol.