Hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end

Patent metadata

Field	Value
Publication number	US-12267100-B2
Application number	US-202217877896-A
Country	US
Kind code	B2
Filing date	Jul 30, 2022
Priority date	Jan 24, 2022
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

The present disclosure provides a hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end, including an intermediate frequency circuit and a terahertz circuit arranged up and down, where the terahertz circuit includes a local oscillator frequency tripler, a 135° 3 dB filter coupler, a radio frequency waveguide power divider, and two quartz hetero-integrated subharmonic mixers; resonant cavities of an input unit, a first output unit, an isolation unit, and a second output unit of the 135° 3 dB filter coupler are sequentially coupled through resonant grooves to form a ring structure, a cavity length of the resonant cavity of the input unit is twice that of the resonant cavities of the other three units, and an electrical length of a waveguide of the first output unit is 45° different from that of a waveguide of the second output unit.

First claim

What is claimed is:

1. A hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end, comprising an intermediate frequency circuit and a terahertz circuit arranged up and down, wherein the terahertz circuit comprises a local oscillator frequency tripler, a 135° 3 dB filter coupler, a first quartz hetero-integrated subharmonic mixer, a second quartz hetero-integrated subharmonic mixer, and a radio frequency waveguide power divider; the 135° 3 dB filter coupler comprises an input unit, a first output unit, a second output unit, and an isolation unit each of which is composed of a resonant cavity and a waveguide, and the resonant cavities of the input unit, the first output unit, the isolation unit, and the second output unit are sequentially coupled through resonant grooves to form a ring structure; a cavity length of the resonant cavity of the input unit is twice that of the resonant cavities of the other three units, and an electrical length of the waveguide of the first output unit is 45° different from that of the waveguide of the second output unit;
a radio frequency signal is divided by the radio frequency waveguide power divider into two signals, which respectively enter the first quartz hetero-integrated subharmonic mixer and the second quartz hetero-integrated subharmonic mixer; a local oscillator signal is tripled by the local oscillator frequency tripler, then filtered and coupled by the 135° 3 dB filter coupler into two local oscillator drive signals, which respectively enter the first quartz hetero-integrated subharmonic mixer and the second quartz hetero-integrated subharmonic mixer to drive frequency mixing; and intermediate frequency components generated after the frequency mixing by the first quartz hetero-integrated subharmonic mixer and the second quartz hetero-integrated subharmonic mixer are respectively inputted to the intermediate frequency circuit, 90° coupled and amplified, to output an upper side band (USB) signal and a lower side band (LSB) signal.

2. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the intermediate frequency circuit and the terahertz circuit are connected by a first low-loss probe and a second low-loss probe.

3. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the waveguide of the input unit is connected to a ¼ section of the resonant cavity.

4. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the waveguides of first output unit, the isolation unit, and the second output unit each are connected to a ½ section of the corresponding resonant cavity.

5. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the intermediate frequency circuit comprises an intermediate frequency 90° bridge and an intermediate frequency low-noise amplifier arranged in sequence, and the intermediate frequency components generated after the frequency mixing by the first quartz hetero-integrated subharmonic mixer and the second quartz hetero-integrated subharmonic mixer are coupled by the intermediate frequency 90° bridge, and amplified by the intermediate frequency low-noise amplifier, to generate the USB signal and the LSB signal.

6. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the first quartz hetero-integrated subharmonic mixer and the second quartz hetero-integrated subharmonic mixer each comprise a radio frequency waveguide-suspended microstrip line transition, a radio frequency matching circuit, an anti-parallel diode pair, a local oscillator matching circuit, a local oscillator low-pass filter, a local oscillator waveguide-suspended microstrip line transition, an intermediate frequency low-pass filter, and an intermediate frequency output port arranged in sequence.

7. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the local oscillator frequency tripler comprises an input waveguide, an input waveguide-microstrip line transition, an input low-pass filter, an input matching circuit, a same-directional-parallel diode pair, an output matching circuit, an output waveguide-microstrip line transition, and an output waveguide arranged in sequence.

8. The hetero-integrated terahertz low-noise miniaturized image frequency rejection transceiver front-end according to claim 1 , wherein the radio frequency waveguide power divider uses a Y-junction power divider circuit structure.

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Zhang Bo
• Niu Zhongqian
• Yang Xiaobo
• Dai Bingli
• Hu Yi
• Zhang Jicong
• Fan Yong
• Liu Ke
• Chen Zhi

Classifications

• H03D7/165 Primary

  at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature (combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002) · CPC title

• H01P1/208

  Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (H01P1/205 takes precedence) · CPC title

• H01P5/22

  Hybrid ring junctions · CPC title

• H03B19/10

  using multiplication only · CPC title

• H01P1/207

  Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) · CPC title