Compact Partial$H$-Plane Filters

In this paper, three types of partial H-plane filters, having advantages of compact, low cost, and mass-producible properties, are presented as compact waveguide filters, which are implemented by partial H-plane waveguide. Two types of partial H-plane filters have the same frequency responses as those of conventional E- and H-plane filters, respectively, while their cross sections are one-quarter. To further reduce the length, the last type of partial H-plane filters is designed by using quarter-wavelength resonators. The length of this filter is shorter by 29.2% than that of the conventional E-plane filter. In addition, it has a superior spurious frequency response