Microwave filter

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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333246, H01P 1203

Patent

active

050159763

ABSTRACT:
A microwave filter is disclosed in which open-ended lines are connected at three or four points of a main line having input and output terminals. The open-ended lines have a length about one fourth the wavelength of an image signal frequency thereby to produce a band-stop filter characteristic with an image frequency, all or parts of the open-ended lines constitute open-ended parallel-coupled lines arranged in parallel to the main line, and the intevals of connection of the open-ended lines with the main line are properly selected. The insertion loss of the filter within the pass band of a radio frequency signal is reduced and the filter attenuation within a stop band of an image signal is increased, thus providing a compact band-stop filter which has a steep rise characteristic.

REFERENCES:
patent: 3875538 (1975-04-01), Minet et al.
patent: 4074214 (1978-02-01), Aichholzer
Bates et al., "Designing Bandstop Filters for Microwave Frequencies", Electronic Engineering, vol. 50, No. 604, Apr. 1978, pp. 39-41.
Schiffman et al., "Exact Design of Band-Stop Microwave Filters", IEEE Trans. MTT, vol. MTT-12, Jan. 1964, pp. 6-15.
Malherbe, "TEM Pseudoelliptic-Function Bandstop Filters Using Noncommensurate Lines", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, No. 5, pp. 242-248, May 1976.
Bates, "Design of Microstrip Spur-Line Band-Stop Filters", Microwaves-Optics and Acoustics, vol. 1, No. 6, Nov. 1977, pp. 209-214.

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