Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1989-11-07
1991-05-14
Laroche, Eugene R.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
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.
Ham Seung
LaRoche Eugene R.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Microwave filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microwave filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1651323