NOVEL MICROWAVE FILTER DESIGN TECHNIQUES.
Quarterly progress rept. no. 2, 1 Apr-30 June 63,
STANFORD RESEARCH INST MENLO PARK CA
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Tables of element values are presented for lumped-element Chebyshev impedance-transforming networks, as are tables giving the Chebyshev pass-band ripple of each design. These circuits consist of a ladder network formed using series inductances and shunt capacitances they give a Chebyshev impedance match between resistor terminations of arbitrary ratio designs with resistor termination ratios from 1.5 to 50 are tabulated. The responses of these networks have moderately high attenuation at dc the amount of attenuation depends on the termination ratio their attenuation then falls to a very low level in the Chebyshev operating band, and then rises steeply above the operating band in a manner typical of low-pass filters. Designs having operating-band fractional bandwidths ranging from 0.2 to 1.0 are given. Work on magnetically tunable band-stop filters was continued the design of a band-stop filter using dielectric loading to increase the coupling to the YIG resonators is described. Tests show that the presence of the dielectric does not degrade the linewidth of the resonators. The measured performance is in good agreement with the theory. Author