Nonlinear Matched Reflection Mode Bandstop Filters for Frequency Selective Limiting Applications

This paper presents the design of frequency-selective limiting circuits based on nonlinear matched reflection-mode bandstop resonators. This type of frequency selective limiters achieve fast switching, high-level of power limiting, and flexible channel bandwidth. Initial measured results of a first-order device indicate 0 dBm limiting threshold, 32 dB limiting level, 2 dB insertion loss, and 200 MHz limiting bandwidth. A third degree device is also presented. Simulated results show an excellent highly selective bandstop performance at high powers with a near all-pass response at low signal powers. This is the first time such a multi-pole matched frequency selective limiter has been reported.

[1]  Spike leakage and suppression in frequency selective limiters , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[2]  A.C. Guyette,et al.  Perfectly-matched bandstop filters using lossy resonators , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[3]  A.J. Giarola,et al.  A review of the theory, characteristics, and operation of frequency selective limiters , 1979, Proceedings of the IEEE.

[4]  D. Jachowski,et al.  Passive enhancement of resonator Q in microwave notch filters , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[5]  S. N. Stitzer,et al.  Frequency selective limiters for high dynamic range microwave receivers , 1993, 1993 IEEE MTT-S International Microwave Symposium Digest.