Tiled transversely-excited film bulk acoustic resonator high power filters

Patent metadata

Field	Value
Publication number	US-12155374-B2
Application number	US-202217588803-A
Country	US
Kind code	B2
Filing date	Jan 31, 2022
Priority date	Apr 2, 2021
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

Tiled filters are disclosed. A filter includes an n×m array of sub-filters, where n is a number of sub-filters in parallel and m is a number of sub-filters in series. n and m are non-zero positive integers and at least one of n and m is greater than one. All of the nm sub-filters are bandpass filters with substantially the same passbands.

First claim

It is claimed:

1. A filter comprising:
an n×m array of sub-filters, where;
n is a number of sub-filters in parallel,
m is a number of sub-filters in series,
n and m are non-zero positive integers,
at least one of n and m is greater than one, and
all of the nm sub-filters are bandpass filters with substantially the same pass-bands; and

a filter input connected to inputs of n sub-filters of the nm sub-filters,
wherein an input of each of the n sub-filters is approximately matched to nZs, where Zs is a system source impedance.

2. The filter of claim 1 , wherein each of the nm sub-filters comprises:
a plurality of transversely-excited film bulk acoustic resonators connected in a ladder filter circuit.

3. The filter of claim 1 , wherein Zs=50 ohms, n=2, and the input of the each of the two sub-filters is matched to 100 ohms.

4. The filter of claim 1 , wherein Zs=50 ohms, n=3, and the input of the each of the three sub-filters is matched to 150 ohms.

5. A filter comprising:
an n×m array of sub-filters, where:
n is a number of sub-filters in parallel,
m is a number of sub-filters in series,
n and m are non-zero positive integers,
at least one of n and m is greater than one, and
all of the nm sub-filters are bandpass filters with substantially a same pass-band; and

a filter output connected to outputs of n sub-filters of the nm sub-filters,
wherein an output of each of the n sub-filters is approximately matched to nZl, where Zl is a system load impedance.

6. The filter of claim 5 , wherein Zl=50 ohms, n=2, and the output of the each of the two sub-filters is matched to 100 ohms.

7. The filter of claim 5 , wherein Zl=50 ohms, n=3, and the output of the each of the three sub-filters is matched to 150 ohms.

8. A filter comprising:
n sub-filters connected in parallel between a filter input and a filter output,
wherein all of the n sub-filters are bandpass filters with substantially the same pass-bands, and
wherein each of the n sub-filters has an input connected to the filter input, and each of the inputs of the n sub-filters is approximately matched to nZs, where Zs is a system source impedance.

9. The filter of claim 8 , wherein Zs=50 ohms, n=2, and the input of the each of the two sub-filters is matched to 100 ohms.

10. The filter of claim 8 , wherein each of the n sub-filters comprises:
a plurality of transversely-excited film bulk acoustic resonators connected in a ladder filter circuit.

11. The filter of claim 8 , wherein Zs=50 ohms, n=3, and the input of the each of the three sub-filters is matched to 150 ohms.

12. The filter of claim 8 , wherein
each of the n sub-filters has an output connected to the filter output, and
each of the outputs of the n sub-filters is approximately matched to nZl, where Zl is a system load impedance.

13. The filter of claim 12 , wherein Zl=50 ohms, n=2, and the output of the each of the two sub-filters is matched to 100 ohms.

14. The filter of claim 12 , wherein Zl=50 ohms, n=3, and the output of the each of the three sub-filters is matched to 150 ohms.

Assignees

• Murata Manufacturing Co

Inventors

• Dyer Greg
• Yang Wei
• Mukandatimana Marie Chantal
• Myers luke
• Fenzi Neal
• Guyette Andrew
• Garcia Bryant

Classifications

• H03H17/0285

  Ladder or lattice filters · CPC title

• H03H9/605

  consisting of a ladder configuration · CPC title

• H03H7/075

  Ladder networks, e.g. electric wave filters · CPC title

• H03H2003/023

  the resonators or networks being of the membrane type · CPC title

• H03H3/02

  for the manufacture of piezoelectric or electrostrictive resonators or networks (H03H3/08 takes precedence) · CPC title