Parallel coupled microstrip and E-plane metal insert waveguide band-pass filter at W-band

In this paper we discuss two types of band-pass filters at W-band, one is a parallel coupled microstrip band-pass filter and the other is an e-plane metal insert waveguide bandpass filter. The -20dB bandwidth of the parallel coupled microstrip filter is lager than 2.4GHz, while the -20dB bandwidth of the e-plane metal insert waveguide filter is lager than 1.8GHz. The simulation results are better than those in the literatures. Actual design methods are illustrated in this paper, which could play an important role in the design of these two kinds of filters at W-band quickly and efficiently.