Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1986-04-07
1987-05-19
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333202, 333223, 333224, 333234, 333263, H01P 512, H01P 1201, H01P 708
Patent
active
046671722
ABSTRACT:
Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300). The microstrip combiner (300) includes a circuit board (310) having five transmission lines (601-605) and a short-circuited tuning transmission line (610), all coupled to a junction (620). The microstrip combiner (300) is tuned by means a variable impedance produced by varying the position of a dielectric tuning plate (630) with respect to a the tuning transmission line (610).
REFERENCES:
patent: 2436427 (1948-02-01), Ginzton
patent: 3139597 (1964-06-01), French et al.
patent: 3339158 (1967-08-01), Passaro
patent: 3440573 (1969-04-01), Butler
patent: 3621476 (1971-11-01), Kanbayashi
patent: 3633104 (1972-01-01), Gray
patent: 3673518 (1972-06-01), Carr
patent: 3701054 (1972-10-01), Hagler
patent: 3840828 (1974-10-01), Linn et al.
patent: 4019161 (1977-04-01), Kimura et al.
patent: 4024481 (1977-05-01), Kivi
patent: 4136320 (1979-01-01), Nishikawa et al.
patent: 4211986 (1980-07-01), Tajima
patent: 4241322 (1980-12-01), Johnson et al.
patent: 4375622 (1983-03-01), Hollingsworth
patent: 4488130 (1984-12-01), Young et al.
patent: 4488132 (1984-12-01), Collins et al.
patent: 4525690 (1985-06-01), De Ronde
patent: 4543545 (1985-09-01), Craine et al.
"Design of Cylindrical Dielectric Resonators in Inhomogeneous Media" by Rene R. Bonetti and Ali E. Atia, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-29, No. 4, 4-1981.
"Microwave Bandpass Filters Containing High-Q Dielectric Resonators" by Seymour B. Cohn, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-16, No. 4, Apr. 1968.
Longshore Theodore F.
Wanat Ronald J.
Gensler Paul
Hackbart Rolland R.
Motorola Inc.
LandOfFree
Ceramic transmitter combiner with variable electrical length tun does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ceramic transmitter combiner with variable electrical length tun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ceramic transmitter combiner with variable electrical length tun will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1567273