DESIGN AND SIMULATION OF DIPLEXER FOR RECEIVE TERMINAL OF RANGING TRANSPONDER

ELECTRONICS AND COMMUNICATION

Now a day’s , Diplexers are used in various applications like, Cellular Handsets, GPS Receivers, Cordless Phones, Wireless LANs, Wireless Data, and satellite communications etc. But diplexers is operate at different frequency band for different application. I will design diplexers for two frequency band, one at 3.4GHz frequency and other at 6.7GHz frequency for Receive terminal of Ranging Transponder of IRNSS system. The diplexer is one of the major components in a Receiver front-end. Design of diplexers is done by using Advance Design System (ADS). First I will design two filter at two different frequency band. Once filter match with it’s specification I will combine two filter using power divider. This paper describe a step-by- step of the design, simulation and measurement of coupled line bandpass filter at 3.4 Ghz and 6.7 Ghz. This two frequency band are used in IRNSS application. Advanced Design System (ADS 2011_10) simulation tool is used to simulate a prototype of band pass filter using distributed component for both the frequency band. FR-4 type substrate has the relative permittivity of 4.6 and tangent loss of 0.023 is used in designing the parallel coupled bandpass filter for IRNSS application. Using chebyshev approach for filter design, it provide good filter characteristics at both frequency 3.4 GHz and 6.7 GHz. At both frequencies insertion loss is less than -0.5 dB and return loss is better than 20 dB. Once filter is designed it will combine using power divider and it will provide insertion loss less than 1 dB and isolation between two point is better than 100 dB.

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