A pin switch with high stable isolation

Abstract

The invention relates to a PIN switch with high stable isolation. The PIN switch comprises a kovar backing plate whose upper surface is provided with multiple grooves and protruding grooves with intervals, and the two ends of the kovar backing plate are the grooves. The PIN switch also comprises multiple dielectric substrates which are correspondingly arranged on the grooves and can be bonded to the kovar backing plate. Each of the dielectric substrates is provided with a microwave signal conduction band for transmiting a microwave signal. The PIN switch also comprises multiple PIN diode chips for controlling the on and off of the microwave signal, and the multiple PIN diode chips are corresponding arranged on the protruding grooves and can be bonded to the kovar backing plate. The PIN switch also comprises multiple bonding lines which are bonded with the microwave signal conduction bands connected between every two adjacnet dielectric substrates and the cores of the PIN diode chips, the distance between each two PIN diode chips is 1 / 4 wavelength which indicates the transmission wavelength of the microwave signal on the dielectric substrates. By using a modularization design, the integration use is easy, the degree of isolation is high, the isolation has high stabilization consistency, the PIN switch is used in a multichannel microwave system, and the stabilization consistency of signal turn-off can be realized.

Description

technical field [0001] The invention relates to a PIN switch, in particular to a PIN switch with high and stable isolation, and belongs to the technical field of microwave circuit design. Background technique [0002] In microwave systems, it is often required to control the transmission of microwave signals. The PIN switch uses a PIN diode (a thin layer of low-doped intrinsic Intrinsic semiconductor layer is added between the P semiconductor material and the N semiconductor material to form a P-I-N structure. The diode is a microwave semiconductor control device made of the electrical characteristics of the PIN diode) under different biases, and is widely used in the on-off control of microwave signals. Isolation is a main index of PIN switch, which is used to measure the degree of turning off the microwave signal. [0003] Usually, in order to achieve the high isolation requirements required by the PIN switch, it is necessary to connect multiple PIN diode chips without pa...

AI Technical Summary

Problems solved by technology

[0004] However, in the assembly process of PIN diodes, some errors may occur: 1. Due to the small size of PIN diodes, when cutting microstrip lines, the spacing between microstrip lines cannot be very accurate, and the spacing is often It will be much larger than the width of the PIN diode, causing the interconnected gold wire bonding wire to be too long, thereby reducing the isolation of the PIN switch and increasing the insertion loss index of the PIN switch; 2. The distance between the two PIN diodes The tube spacing cannot be well guaranteed to be 1 / 4 wavelength, so it will also reduce the isolation of the PIN switch

[0005] Due to the errors that may be introduced above, in a multi-channel microwave system, the degree of off-off of the microwave signal of each channel is different, so that the stability and consistency required by the high isolation of multiple PIN switches cannot be achieved.

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