Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1992-07-21
1994-03-01
Nelli, Raymond A.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, H01P 120
Patent
active
052911616
ABSTRACT:
In a microwave band-pass filter provided with a main line having an input terminal and an output terminal on both ends thereof, first, second, third and fourth open-ended stubs having lengths L1, L2, L3 and L4 connected electrically in parallel to the main line at intervals L0, L0' L0", respectively. The lengths of two of the four open-ended stubs are selected to be substantially equal to a quarter of the wavelength of the first stop-band frequency signal on the band lower than the pass-band, and the lengths of the others thereof are selected to be substantially equal to a quarter of the wavelength of the second stop-band frequency signal on the band higher than the pass-band. In this case, the insertion loss thereof steeply increases on a boundary band from one stop-band to the pass-band. In particular, there can be obtained the microwave band-pass filter having a simpler structure, in which the insertion loss steeply increases on the band higher or lower than the pass-band, and the insertion loss on the band lower or higher than the pass-band is relatively large over a relatively wide band, respectively.
REFERENCES:
patent: 3678433 (1972-07-01), Hallford
patent: 3721919 (1973-03-01), Grace
patent: 3875538 (1975-04-01), Minet et al.
patent: 4074214 (1978-02-01), Aicholzer
patent: 4288766 (1981-09-01), Okita
patent: 4489292 (1984-12-01), Ogawa
patent: 5015976 (1991-05-01), Saka
patent: 5021757 (1991-06-01), Kobayashi et al.
"A Printed-Circuit Hybrid-Ring Directional Coupler for Arbitrary Power Divisions", Agrawal et al., IEEE Transactions on Microwave Theory & Techniques, vol. MTT-34, No. 12, Dec. 1986, pp. 1401-1407.
"Narrowband elliptic filters on microstrip", Ness et al., Microwaves & RF, Nov. 1984, pp. 75-79 & 134.
Matsushita Electric - Industrial Co., Ltd.
Nelli Raymond A.
LandOfFree
Microwave band-pass filter having frequency characteristic of in 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 band-pass filter having frequency characteristic of in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave band-pass filter having frequency characteristic of in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-581037