A Novel LSB Discriminator for a 5 bit IFM Subsystem Based on Microstrip Band-Stop Filter

The authors have studied a new way to design IFM (Instantaneous Frequency Measurement) subsystem. The method is based on band-stop filters. The IFM uses rectangular open loop resonators instead of delay lines. The resonance frequency is adjusted by resonator perimeter, that must be half guided wavelength, and also by coupling distance between the resonators and the main transmission line. A LSB (least significant bit) discriminator of an IFM subsystem with resolution of 62.5 MHz is designed. The device has been fabricated on RT6010.2 substrate of thickness h=1.27 mm. A full wave EM simulator is used to obtain the frequency response.

[1]  A. Gorur.  Bandstop filter with a wider upper passband using microstrip open-loop resonator , 2001, APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577).

[2]  Jia-Sheng Hong,et al.  Microstrip filters for RF/microwave applications , 2001 .

[3]  G.-C. Liang,et al.  Space-qualified superconductive digital instantaneous frequency-measurement subsystem , 1996 .

[4]  Michael J. Lancaster,et al.  Coplanar strips interdigital delay line for instantaneous frequency measurement systems , 1996 .

[5]  C. F. Shih,et al.  Superconductive digital instantaneous frequency-measurement subsystem , 1994, Photonics West - Lasers and Applications in Science and Engineering.

[6]  W. Jutzi,et al.  A 4 bit instantaneous frequency meter at 10 GHz with coplanar YBCO delay lines , 1995, IEEE Transactions on Applied Superconductivity.

[7]  M. Czyzewski,et al.  The instantaneous frequency measurement receiver in the complex electromagnetic environment , 2004, 15th International Conference on Microwaves, Radar and Wireless Communications (IEEE Cat. No.04EX824).