Patent ID: 11901880
Assignee: AKOUSTIS, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. An RF diplexer device, the device comprising:
a first filter circuit configured to receive a first input signal and to produce a first filtered signal;
a second filter circuit configured to receive a second input signal and to produce a second filtered signal;
wherein each of the first and second filter circuits comprises a plurality of series resonators and a plurality of shunt resonators;
wherein each of the series resonators comprises
a substrate member having a cavity region and an upper surface region contiguous with an opening of the cavity region,
a bottom electrode within a portion of the cavity region,
a piezoelectric material overlying the upper surface region and the bottom electrode,
a top electrode overlying the piezoelectric material and overlying the bottom electrode, and
an insulating material overlying the top electrode; and
a multiplexer coupled to the first filter circuit and the second filter circuit and configured to select between the first filtered signal and the second filtered signal,
wherein the first filter circuit has a first circuit response configured from the serial configuration of the first filter circuit and the parallel configuration of the first filter circuit to achieve a first transmission loss from a first pass band having a first characteristic frequency centered around 5.5225 GHz and having a bandwidth from 5.150 GHz to 5.895 GHz; and
wherein the second filter circuit has a second circuit response configured from the serial configuration of the second filter circuit and the parallel configuration of the second filter circuit to achieve a second transmission loss from a second pass band having a second characteristic frequency centered around 6.530 GHz and having a bandwidth from 5.935 GHz to 7.125 GHz,
wherein the first filter circuit comprises a maximum insertion loss of 3.0 dB within the first pass band, a maximum amplitude variation characterizing the pass-band of less than 2.0 dB, and a minimum return loss characterizing the pass-band of 9 dB; and
wherein the second filter circuit comprises a maximum insertion loss of 3.0 dB within the second pass band, a maximum amplitude variation characterizing the pass-band of less than 2.0 dB, and a minimum return loss characterizing the pass-band of 10 dB.