Wideband SPDT Switch For Rf Applications

Aurther , Chow Zha Khang (2011) Wideband SPDT Switch For Rf Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is discussed wideband RF switches for radio frequency (RF) applications. The aim of this project is to increase the bandwidth of the switch as much as possible to be used in various applications. This project is focusing on switch design by using PIN Diode. Besides, this project will use Single Pole Double Throw (SPDT) switch type of the RF switch due to Time Division Duplex which is transmit and receive shared the same frequency. This project is focusing more on the topologies of the SPDT switch in improving bandwidth rather than use different material. This project also discussed each topologies functionality, advantages and disadvantages. The selected topologies are simulated by using Advanced Design Systems (ADS) software. In the simulation result, we will discuss on the insertion loss and isolation of the switch. In order to fabricate the switch in future, our requirement of insertion loss is less than 1 dB and isolation is around 20dB. Modification will be made in topologies in order to maintain its wideband characteristic and improve its insertion loss and isolation. 3 topologies are discussed in this project which is 2 types of series-shunt-shunt topologies and Broadband shunt SPDT switch topology. Tuning of each element in topologies is done by obtaining the best result in simulation section. The best topology is selected as the topology that used in this project and fabrication is carried out on to it by using FR-4 substrate board. Prototypes are measured and comparison between prototypes is done to select the best performance prototype to be final product.

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