Metallic E-plane filter with cavities of different cutoff frequency
Abstract
A planar integrated circuit filter with multiple all-metal inserts and multiple abrupt waveguide step-wall discontinuities is introduced which achieves broadband high attenuation in the second stopband. The design is based on field expansion into suitably normalized eigenmodes which yield directly the modal S-matrix. This theory allows the immediate inclusion of both the higher-order mode interaction at all discontinuities and the finite thickness of the inserts. Computer-optimized design data for a five-resonator Ka-band prototype filter at 27 GHz midband frequency provide a minimum stopband attenuation of 50 dB between 27.5 and 44.5 GHz.
- Publication:
-
Electronics Letters
- Pub Date:
- May 1986
- DOI:
- 10.1049/el:19860357
- Bibcode:
- 1986ElL....22..524B
- Keywords:
-
- Computer Aided Design;
- Insertion Loss;
- Integrated Circuits;
- Microwave Filters;
- Rectangular Waveguides;
- Broadband;
- Eigenvectors;
- Microwave Attenuation;
- S Matrix Theory;
- Electronics and Electrical Engineering