A scalable multi-channel radio frequency switch device controlled by usb interface

Abstract

The invention provides a USB interface control expandable multi-channel radio frequency switch device. Domestic and abroad bus interface radio frequency switch modules are fully studied, the characteristics of USB plug and play and high universality are fully used, joints are welded on printed circuit boards directly, and accordingly, the index stability is improved on the basis of the study according to modular and small design thoughts. Indexes of insertion losses and the like are reduced by replacing a traditional cable connection mode with a micro-strip line. The isolation index among channels is improved in a relay unit symmetric and staggered arrangement mode. Radio frequency panels and a USB interface control panel are connected tightly by opening slots on printed circuit boards, and accordingly, the maintainability is improved. The miniaturization is further improved by arranging two radio frequency switch panels oppositely. A plurality of backing columns are used as supports, and a plurality of radio frequency panels are arranged vertically, accordingly, the device expansibility is further improved. By means of the device, the index and the stability of radio frequency paths are improved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency microwave testing, and in particular relates to an expandable multi-channel radio frequency switch device controlled by a USB interface. Background technique [0002] The existing 16-channel radio frequency switch module of other bus interfaces is mainly composed of a radio frequency connection unit, a relay array unit, a drive logic unit, an interface and a control unit. The main control computer sends different parameters through the corresponding bus to control multiple radio frequency switch channels. [0003] The traditional RF connection unit is mainly composed of RF connectors and RF cables. One end of the RF cable is connected to the RF connector joint, and the other end is welded to the through hole corresponding to the input / output of the relay on the printed board. This connection makes the RF channel The index is greatly affected by the welding process level and the disturbanc...

AI Technical Summary

Problems solved by technology

[0007] 1. The hardware indicators are not ideal

[0008] The traditional method of using radio frequency cables to directly lead signals from the corresponding signal output ports on the printed circuit board is restricted by the factors of the radio frequency cable itself and the degree of connection matching with the relay. The cable is affected by external forces, and the index stability is poor; , there is crosstalk, so the isolation index is not high; the insertion loss is affected by the length of the cable and the degree of matching between the cable and the RF signal via, and the index is relatively high

[0009] 2. Difficult to maintain and upgrade

[0010] The entire hardware of the existing RF switch module is implemented on one circuit board, and the cable is close to the relay and passes through the top. If the relay needs to be replaced, the cable needs to be removed first, and then the replacement can be performed. The maintainability is strong; if the entire hardware needs to be upgraded, it needs to be replaced. entire circuit board

[0011] 3. Poor versatility

[0012] At present, all kinds of RF switch modules are based on specific bus interface standards. There is a lack of unified interface standards in the process of building an automatic test system. Various bus interface instruments are intertwined, which is not easy to control and has poor versatility.

[0013] 4. The scalability is not strong

[0014] RF switch modules based on other bus interfaces are limited by the number of channels limited by the structural space of a specific bus standard chassis. If expansion is required, it can only be expanded by increasing the number of slots, and the control requires individual control of a single module, which cannot meet the requirements of multi-channel automatic switching. test system needs

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