Yig tuned high performance filters using full loop, nonreciproca

Details Yig tuned high performance filters using full loop, nonreciproca Yig tuned high performance filters using full loop, nonreciproca

1992-10-08

1995-05-23

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

3332192, H01P 1218

Patent

active

054185076

ABSTRACT:
A nonreciprocally coupled ferrimagnetic band reject and bandpass filter having passbands from 2-18 GHz and 6-18 GHz respectively. The band reject filter comprises one or more ferrimagnetic spheres shielded from each other by placement in nonmagnetic, electrically conductive cavities in a block placed in the flux gap of a tuning magnet. Nonreciprocal coupling is achieved by using full RF coupling loops and establishing all factors that affect the transmission line delay for travel of signals from one point in the filter to another such as loop length and size, cavity size, sphere size and spacing, dielectric constant, RF coupling loop wire size and spacing etc. such that the effective electrical length from the center of one full RF coupling loop to the centerline of the neighboring RF coupling loop is 1/4 wavelength, i.e., an electrical phase change of 90 degrees occurs, and by placing the ferrimagnetic spheres outside the planes of their respective RF coupling loops to minimize the effect of (2,2,0) Walker modes. A ferrimagnetic passband filter comprises at least an input ferrimagnetic sphere in a cavity and an output ferrimagnetic sphere in a cavity in a nonmagnetic, conductive block located in the flux gap of a tuning magnet. Both the input and output spheres are coupled to full RF coupling loops coupling an RF input and an RF output, respectively, to the ferrimagnetic spheres and to ground. The effective electrical length between the RF input or RF output and ground through the respective RF coupling loops is 1/4 wavelength. Coupling is set tight to achieve wide bandwidth. The ferrimagnetic spheres are offset from the plane of the loop to achieve nonreciprocal coupling thereby allowing the (2,2,0) Walker mode spurious responses to be eliminated from the tunable passband.

REFERENCES:
patent: 4179674 (1979-12-01), Keane et al.
patent: 4480238 (1984-10-01), Iwasaki
patent: 4500858 (1985-02-01), Mezak
patent: 5221912 (1993-06-01), Keane et al.
Keane, "Narrow-Band YIG Filters and Wide-open Receivers", Microwaves, Sep. 1978.

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