论文信息 - Compact pseudo-highpass filters formed by cavity and iris resonators

Compact pseudo-highpass filters formed by cavity and iris resonators

A new class of broadband waveguide filters for pseudo-highpass applications is presented. The cavities are initially designed for TM110-mode operation with TE10-mode bypass coupling to create transmission zeros below the passband. The broadband characteristic is achieved by utilizing the coupling irises as additional resonances, thus achieving a pseudo-highpass operation with a minimum of physical cavities. Several designs for passbands starting at around 10 and 12 GHz are presented, and bandwidths of up to 41 percent are achieved. The design process allows for implementation of either vertical or horizontal (inline) I/O ports. Both types are verified by measurements.

[1] S.B. Cohn. Design Relations for the Wide-Band Waveguide Filter , 1950, Proceedings of the IRE.

[2] D. A. Leedom,et al. Bandpass and Pseudo-High-Pass Quasi-Optical Filters , 1970 .

[3] G. L. Matthaei,et al. Design of Wide-Band (and Narrow-Band) Band-Pass Microwave Filters on the Insertion Loss Basis , 1960 .

[4] S. Amari,et al. Edge-conditioned vector basis functions for the analysis and optimization of rectangular waveguide dual-mode filters , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[5] J. Bornemann,et al. Mixed-resonance compact in-line pseudo-elliptic filters , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[6] Jens Bornemann,et al. Modal analysis and design of the dual-band orthomode junction , 2002, 2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM].

[7] K. Madsen,et al. Automated minimax design of networks , 1975 .

[8] C.C.H. Tang,et al. Nonuniform Waveguide High-Pass Filters with Extremely Steep Cutoff , 1964 .

[9] Jens Bornemann,et al. Inline TM/sub 110/-mode filters with high-design flexibility by utilizing bypass couplings of nonresonating TE/sub 10/01/ modes , 2003 .