Improved switch line type phase shifter

Abstract

The invention discloses an improved switch line type phase shifter. Three improved switch phase shifting structures are provided for the problems of high insertion loss and low phase shifting precision of an existing switch line type phase shifter, a PIN diode switch and a microstrip line branch connector in the existing switch line type phase shifter are subjected to structure optimization to achieve the purposes of insertion loss of the phase shifter and improve the phase shifting precision and power capacity. The phase shift stability and precision are high, the phase shift quantity is notchanged along with a signal level; and the insertion loss is small, the port standing wave is small, the phase shifting speed is fast, and the required control power is small. The improved switch linetype phase shifter is an important component of a phased array antenna transmitting / receiving component, and the phase of each radiating unit on the aperture surface of the antenna is electrically controlled so as to achieve beam scanning.

Description

technical field [0001] The invention belongs to the technical field of microwave phase shifters, and in particular relates to an improved design of a switch linear phase shifter. Background technique [0002] Microwave phase shifter is the core component of phased array radar, satellite communication, and mobile communication equipment. Its working frequency band and insertion loss directly affect the anti-interference ability and sensitivity of these equipment, as well as the weight, volume and cost of the system. Therefore, Research on broadband and low insertion loss phase shifter is of great significance in military and civilian satellite communication fields. The requirements for the electronically controlled phase shifter are: sufficient phase shifting accuracy, high phase shifting stability, phase shifting amount does not change with temperature, signal level, etc.; small insertion loss, small port standing wave, high power withstand, and phase shifting speed Fast, t...

AI Technical Summary

Problems solved by technology

[0004] (1) When the electrical length of the transmission path is not selected properly, at a certain operating frequency point, the series resonance phenomenon will occur on the transmission line, resulting in increased insertion loss and phase mutation

[0005] (2) No matter how much the phase shifter is, the microwave power transmitted on the transmission line is transferred back and forth between the two branches, so all diodes must bear the highest microwave voltage and the strongest microwave current , the insertion loss is equally high

[0006] (3) The transmission lines on the two branches of the switch line phase shifter should be far enough apart from each other, otherwise the signal attenuation and phase error will be caused by the mutual coupling between the transmission lines, which will affect the phase shifting accuracy

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