Linear phase filter is one of the key components in communication systems,which directly decide the quality of signals,so accurate design is of great importance.In this article,based on cross-coupled resonator topology,a generalised Chebyshev filter response with good phase linearity is achieved.In the designing process,the coupling coefficients are first calculated by fomulas and used as initial values,then physical dimensions of the filter implemented by coaxial cavity can be decided by EM simulation.After that,the EM model of the whole filter is set up and simulated.By EM tuning the parameter of the physical model,the final dimensions are determined,and the manufactured S-band/6.5 MHz bandpass filter show exellent linear phase performance,with less than 6ns phase deviation within 70%of its passband,and the simulated and measured data fits very well.
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