Abstract: Aspects of the disclosure relate to devices, wireless communication apparatuses, methods, and circuitry implementing bulk wave suppression in a stacked electroacoustic device. One aspect includes a first substrate comprising a first surface and a second surface, where the second surface is opposite the first surface, a first AW resonator circuit positioned on the first surface of the first substrate, a plurality of elements including a first element, where the plurality of elements are positioned on the second surface of the first substrate, and where the first element is aligned with the first AW resonator circuit, and a second substrate comprising a first surface and a second surface, where the plurality of elements are positioned on the first surface of the second substrate, and where the plurality of elements create a cavity between the first substrate and the second substrate.

Abstract: Aspects of the disclosure relate to wireless communication, and high-frequency filters with resonators configured to systematically modify phase characteristics of an antenna reflection coefficient. One example is a wireless communication apparatus for a multi-band system comprising a frequency band filter circuit having a filter passband that includes a first band of the multi-band system. The frequency band filter circuit comprises a plurality of resonators coupled between an antenna port and a signal port and a resonant structure electrically coupled to the plurality of resonators. The resonant structure has a resonance outside of the first band and a second band of the multi-band system, the resonance being closer to the second band than to the first band.

Abstract: Aspects of the disclosure relate to wireless communication, and high-frequency filters with resonators configured to systematically modify phase characteristics of an antenna reflection coefficient. One example is a wireless communication apparatus for a multi-band system comprising a frequency band filter circuit having a filter passband that includes a first band of the multi-band system. The frequency band filter circuit comprises a plurality of resonators coupled between an antenna port and a signal port and a resonant structure electrically coupled to the plurality of resonators. The resonant structure has a resonance outside of the first band and a second band of the multi-band system, the resonance being closer to the second band than to the first band.