# US 12,603,643 B2 · Frequency selecting/switching circuit

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- Number: US 12,603,643 B2
- Document ID: US12603643B2
- Status: Granted
- Kind: B2
- Application number: 18/425,088
- Filed: 2024-01-29
- Published: 2024-05-23
- Granted: 2026-04-14
- Earliest claimed: 2021-08-24
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Hiroyuki Aoyama; Akimichi Hirota; Hidenori Yukawa; Toru Fukasawa
- Web page: https://patentgrep.com/patent/US12603643B2

## CPC

- H03K 5/01: Shaping pulses (discrimination against noise or interference H03K5/125)
- H03H 7/46: Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03K 5/00006: {Changing the frequency (modulating pulses H03K7/00; frequency dividers H03K21/00 - H03K29/00; additive or subtractive mixing of two pulse rates into one G06F7/605; pulse rate dividers G06F7/68)}
- H03K 2005/00286: {Phase shifter, i.e. the delay between the output and input pulse is dependent on the frequency, and such that a phase difference is obtained independent of the frequency}
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

A frequency selecting/switching circuit includes an input terminal, an output terminal, a two-way splitter circuit, a first phase-adjusting circuit, a second phase-adjusting circuit, a first switch, and a second switch. The two-way splitter circuit splits a signal inputted to the input terminal into first and second frequency components and outputs them to its first output end and second output end, respectively. The first output end and second output end of the two-way splitter circuit are connected to a first end of the first phase-adjusting circuit and a first end of the second phase-adjusting circuit, respectively. A second end of the first phase-adjusting circuit and a second end of the second phase-adjusting circuit are connected to the first switch and the second switch, respectively. Each switch switches an output of a signal inputted to its input end, to its output end between a conductive state and a non-conductive state.

## Claims

### Claim 1

A frequency selecting/switching circuit comprising:
an input terminal to input a signal;
an output terminal to output a signal;
a two-way splitter circuit that has an input end connected to the input terminal, splits the signal inputted to the input terminal into a first frequency component and a second frequency component, and outputs the first frequency component to a first output end and the second frequency component to a second output end;
a first phase-adjusting circuit having a first end connected to the first output end of the two-way splitter circuit;
a second phase-adjusting circuit having a first end connected to the second output end of the two-way splitter circuit;
a first switch having an input end connected to a second end of the first phase-adjusting circuit and an output end directly or indirectly connected to the output terminal, the first switch being configured to switch an output of a signal inputted to the input end, to the output end between a conductive state and a non-conductive state; and
a second switch having an input end connected to a second end of the second phase-adjusting circuit and an output end directly or indirectly connected to the output terminal, the second switch being configured to switch an output of a signal inputted to the input end, to the output end between the conductive state and the non-conductive state, wherein
when a signal having a frequency of the second frequency component passes through the first switch in the conductive state and the first phase-adjusting circuit, is reflected at the first output end of the two-way splitter circuit, and passes again through the first phase-adjusting circuit and the first switch in the conductive state, the first phase-adjusting circuit adjusts a phase of the signal outputted last from the first switch and a phase of the signal inputted first to the first switch to a same phase,
when a signal having a frequency of the first frequency component passes through the second switch in the conductive state and the second phase-adjusting circuit, is reflected at the second output end of the two-way splitter circuit, and passes again through the second phase-adjusting circuit and the second switch in the conductive state, the second phase-adjusting circuit adjusts a phase of the signal outputted last from the second switch and a phase of the signal inputted first to the second switch to a same phase,
the first phase-adjusting circuit is a transmission line whose electrical length θ1 is equal to θ1(f2) obtained from Equation (1), as follows:
2(θS(f2)+θ1(f2))−φd1(f2)=±2nπ (1)
here, θ1(f2) is a pass phase of the first phase-adjusting circuit at a frequency component f2, θs(f2) is a pass phase of the first switch in an ON state at the frequency component f2, φd1(f2) is a reflection phase of an f1 output terminal of the two-way splitter circuit at the frequency component f2, and n is a natural number including zero; and
the second phase-adjusting circuit is a transmission line whose electrical length θ2 is equal to θ2(f1) obtained from Equation (2), as follows:
2(θS(f1)=θ2(f1))−φd2(f1)=±2mπ (2)
here, θ2(f1) is a pass phase of the second phase-adjusting circuit at a frequency component f1, θs(f1) is a pass phase of the second switch in an ON state at the frequency component f1, φd2(f1) is a reflection phase of an f2 output terminal of the two-way splitter circuit at the frequency component f1, and m is a natural number including zero.