A single knife dual close switch

Abstract

The invention relates to a monopole double-throw switch which includes a first PIN tube, through which a first input end and a first control end are connected with an output end; a second PIN tube, through which a second input end and a second control end are connected with the output end; a third PIN tube which is electrically coupled between the first input end and the second control end; a forth PIN tube which is electrically coupled between the second input end and the first control end; a fifth PIN tube, through which the first input end is connected with the first control end; a sixth PIN tube, through which the second input end is connected with the second control end; a first absorber circuit which is connected with the anode of the third PIN tube; a second absorber circuit which is connected with the anode of the forth PIN tube. The invention has simple structure, low cost, high reliability, fine return loss index and isolation index.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a single-pole double-throw switch. Background technique [0002] Switches are often used to switch signals in radio frequency circuits. According to the shape of the signal channel, the commonly used switch types are single-pole single-throw (Single-Pole Single-Throw, referred to as SPST), single-pole double-throw (Single-Pole Double-Throw, referred to as SPDT), double-pole double-throw (Double-PoleDouble- Throw, referred to as DPDT) and so on. PIN diodes are a good choice for RF switch designs due to their good switching characteristics. [0003] The PIN tube is a current-controlled variable resistor. When a DC or low-frequency signal is applied to both ends of the PIN tube, its characteristics are similar to the I-V curve of a general diode. It can be used as a rectifier element. When it is forward biased, the PIN tube behaves as A small DC resistance. At this time, the I...

AI Technical Summary

Problems solved by technology

[0012] The embodiment of the present invention provides a single-pole double-throw switch to solve the technical defects that the existing SPDT switch is easy to cause a certain radio frequency signal leakage due to lack of better isolation and absorption measures, and the switch isolation index and return loss index are poor. So as to achieve good isolation index and return loss index, high reliability and other technical effects

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