Abstract Long-period waveguide grating based filters have attracted attention due to their flexible fabrication, a variety of materials and structures, low back reflection, insertion loss, excellent performance in the tuning range temperature sensitivity. To our knowledge, for first time, two-segment polymer long-period was cascaded implement filter with narrower bandwidth. Experimental results...

We propose in this paper, two bandpass filters waveguide technology having rectangular symmetrical discontinuities with a half-radius r , designed and operating respectively the X-Band (9 - 11.5) GHz C-Band (3.5 5.5) GHz. These consists of eight irises placed symmetrically on standard waveguides WR90 WR229 which resonant are inserted. used to couple sections very strongly filter, allows bandwid...

A simple filter application of a new efficient hybrid method is presented in this paper. The method combines the discrete finite difference method in frequency domain (FDFD) with analytical mode matching (MM) technique and orthogonal expansion method. The procedure allows for the analysis of electromagnetic wave scattering by cylindrical objects with arbitrary cross-section located within the r...