Design And Development Of A Single Pole Double Throw (SPDT) Switch For Wireless Data Communication

Teh, Gim Hong (2012) Design And Development Of A Single Pole Double Throw (SPDT) Switch For Wireless Data Communication. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is purpose to create a suitable Single Pole Double Throw (SPDT) switch for wireless data communication and by developing process, come out with fabrication into a micro-strip circuit board and then uses network analyzer to do the measurement. Firstly, specification is set in this project which is the switch has insertion loss, isolation, return loss and frequency range. A switch in wireless communications is an electrical component that can cut off an electrical circuit, interrupting the current from one conductor to another. In this project field, an ideal switch for electronics engineering will fall short due to it have resistance, limits on the current and voltage as they can handle. A SPDT switch is a two way of switch that can change over to two terminals output in such a way that a switch can be used to switch on a red lamp in one position of a green lamp in other position just like traffic lamp. Or another word is it can act as a transceiver which can transmit and receive signal. Besides that, in this project has three different type of design topology or configuration that considers comparing the results in terms of low insertion loss and high isolation. The circuit topology has many types, but in this project only compares three types of configuration which is series, shunt-shunt-shunt and series-shunt-shunt. After the comparison made, comes out the lowest insertion loss and the highest isolation topology that will be chosen and the layout drawing process can proceed. After that, fabricate it onto a micro-strip (FR4) circuit board and observe the results using network analyzer to find the insertion loss and isolation in specification frequency 2.4GHz.

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