DESIGN OF DIPLEXER USING WAVEGUIDE TECHNOLOGY

Abstract

The rapid growth in wireless network has created a massive demand for concise frequency selective components. Diplexers are key components in varieties of communication systems. They are passive devices which implement frequency domain multiplexing and allow various frequencies to share common channel. A novel diplexer is a frequency selective device. It has three ports and six resonators where common junction is replaced by one of the resonator. The diplexer forms an all-resonator based structure and is designed and simulated in the CST Microwave Studio. The diplexer is designed using standard dimensions for rectangular cavity to operate in the X-band and it is based on the synthesis of coupling matrix of a three port coupled resonator. The completed design consists of three ports; one input port with centre frequency of 10 GHz and two output ports with centre frequencies 9.7 GHz and 10.3 GHz respectively with bandwidth approximately around 400MHz .The response of the designed diplexer is carefully studied and the response is good as compared to the response of the ideal diplexer.