Analysis And Design Tunable Wideband Bandpass Filter of a Third-order Chebyshev Based on Parallel coupled Lines

This study is Analysis And Design Tunable Wideband Bandpass Filter based on parallel transmission lines technique. Designing this filter can be a great help to telecommunication reinforcement, compact matching circuit as well as circuits with a certain frequency range. First, a low-pass stage 3 filter was designed by using mathematical formulas, then by considering its important parameters (bandwidth and central frequency) this filter was transferred to a broadband bandpass filter with Chebyshev Response. As a result of this designing, a bandwidth about 57 percent can be seen. The Layout circuit and the results were investigated. By using tuning technique it was tried to improve the response performance of the band-pass filter as well as improving broadband performance, improving input adaptive recovery, improving output adaptive recovery, and better performance of the bandpass and at the band was cut. The result of these designs is a bandwidth about 3.3 GHz and band-pass ripple less than 3 dB. All designs and illustrations are simulated by ADS software and Rogers 6010 substrate with relative permittivity of 10.2 and loss tangent of 0.0027 was used in designing bandpass filter with parallel coupling as substrate

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Keywords: Bandpass ، Parallel coupled ، Chebyshev ، Wideband ، Tuning