In this paper a high-selectivity microstrip band-pass filter with parallel coupling microstrip line is proposed. This microstrip filter adopts Chebyshev's prototype structure, by adding microstrip line at one end of the parallel coupling line to implement circuit matching and adding a high-pass filter circuit at the other end to improve the transmission characteristics. The filter is designed and simulated by RF software. Compared with the traditional parallel coupled microstrip band-pass filter, the bandwidth of this filter is much narrower, transmission characteristics and reflection characteristics are much better from the simulation results.
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