Broadband low-loss directional coupler and frequency modulation transmitter system

A directional coupler, low-loss technology, applied in the transmission system, reducing energy consumption, waveguide devices, etc., can solve the problem of not being able to take into account small size and broadband at the same time, achieve low insertion loss, realize transmission and coupling, easy integrated effect

Active Publication Date: 2022-08-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above existing technologies, it can be concluded that the directional coupler based on PCB and LTCC technology cannot take into account the characteristics of small size and wide frequency band while achieving low loss and strong isolation. Therefore, an IPD-based directional coupler with small size of the device is designed. It is particularly important to realize directional couplers with low insertion loss, broadband, weak coupling and strong isolation while being easy to integrate

Method used

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  • Broadband low-loss directional coupler and frequency modulation transmitter system
  • Broadband low-loss directional coupler and frequency modulation transmitter system
  • Broadband low-loss directional coupler and frequency modulation transmitter system

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Effect test

Embodiment 1

[0051] When designing a broadband low-loss directional coupler based on IPD, ADS software is used on the computer to design and simulate a small-sized directional coupler based on the IPD process and composed of LC cell topology results; its substrate structure is as follows figure 1 As shown, it includes a metal ground 1, a GaAs substrate 2 as a load-carrying body, a SiNx dielectric layer 3, a first metal layer 4, a second metal layer 5 and an air bridge structure 6 stacked on the GaAs substrate 2 in sequence; The first metal layer 4 (20nmTi / 80nm Au) grown by radiation; the lower metal layer (4.5μm Cu / 0.5μm Au) generated by the electroplating process; the SiNx dielectric layer 3 serving as the dielectric between the upper and lower plates of the capacitor, in which part of the SiNx passes through After dry etching, through holes required in the design structure are formed; electroplating metal is used to form the "bridge pier" structure in the air bridge structure 6; the secon...

Embodiment 2

[0054] The first-order circuit topology of the broadband low-loss directional coupler proposed by the present invention is composed of two main circuits, three branches interconnected by the main circuits, and four ground bypasses, such as figure 2 The circuit topology diagram of , the circuit structure is center-symmetric about the center point of the inductive branch interconnected by the main circuit. In the circuit topology diagram of the directional coupler (1st order), it includes four inductors L (L1, L2, L3, L4) on the two main circuits, and four capacitors C (C1, C2, C3, C4), L (L5, L6) on the inductive branch formed by the interconnection of the two main circuits, and C (C5, C6) on the two capacitive branches formed by the interconnection of the two main circuits. The first-order directional coupler circuit topology diagram is connected to each part of the components in the circuit result, and then the components of the layout are used to replace each part L and C a...

Embodiment 3

[0057] A transmitter is a device that can transmit a signal at a certain frequency. It is widely used in various civil and military equipment such as television, radio, communication, alarm, radar, remote control, telemetry, and electronic countermeasures. The directional coupler is an important part of the FM transmitter system, which is directly related to the broadcast quality of the broadcast signal and the operation safety of the broadcast transmitter equipment. Therefore, a directional coupler with small size and excellent performance is very necessary for the realization of some circuits that realize specific functions and to improve the performance in FM transmitters. The novel microwave broadband low-loss directional coupler proposed in the present invention is a weakly coupled directional coupler (coupling degree <-20dB), which is often set at the input and output terminals of the FM transmitter at all levels. In the coaxial line, it is used to provide signals for me...

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Abstract

The invention relates to a broadband low-loss directional coupler which comprises a measuring endpoint. The at least two main circuits are formed by connecting measuring endpoints, and each main circuit is provided with a first inductor; the inductance branch consists of a second inductor and is connected between the at least two main circuits; the capacitance branch circuit is composed of a first capacitor, is connected between the at least two main circuits, and is connected in parallel with the inductance branch circuit; the grounding bypass is connected with the main circuit and is provided with a second capacitor. The directional coupler is designed on the basis of an IPD manufacturing process and by adopting an LC unit circuit topological structure, and excellent radio frequency performance such as low insertion loss, wide band, weak coupling and strong isolation is achieved while the small size and easy integration of the device are considered.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to a broadband low-loss directional coupler and a frequency modulation transmitter system. Background technique [0002] With the rapid development of modern communication technology, microwave communication is mainly used in microwave relay communication, antenna, radar, etc. However, with the improvement of microwave theory and the gradual development of 5G technology and radio frequency identification technology, microwave devices have also begun to receive attention. Directional coupler is one of the widely used microwave components, it can be used in signal detection and processing, signal synthesis, power monitoring, etc.; in wireless communication systems, it can achieve mutual isolation between signals; in continuous wave frequency modulation radar In the system, it can couple part of the energy as the local oscillator signal, and can also be used to synthesize th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/18H04B1/04
CPCH01P5/18H04B1/04Y02D30/70
Inventor 强天王彦雄雷玉双徐梦鑫汤攀
Owner JIANGNAN UNIV
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