Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1988-06-16
1989-07-25
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
334 47, 455334, H03H 746, H04B 126
Patent
active
048517968
ABSTRACT:
TV-RF input circuit provided with an RF coupling device via which an aerial input is coupled to first, second and third parallel tunable RF resonant circuits (11, 21, 31) for a parallel selection of a desired frequency in first, second and third TV frequency bands (50-160 MHz; 160-470 MHz; 470-860 MHz) substantially succeeding one another in frequency, the RF coupling device having a high-pass .pi.-section (C, L2, L3) for suppressing frequencies below the first TV frequency band and being provided with a capacitive series branch and first and second inductive shunt branches, the .pi.-section (C, L2, L3) being coupled via a first series inductance (L1) to the first RF resonant circuit (11). In order to ensure, without extra elements, a substantially reflection-free supply of TV-FR reception signals to each of the RF resonant circuits, second and third series inductances (L2, L3) of mutually equal order are arranged in the first and second inductive shunt branches, respectively, which inductances are coupled at one end to either side of a capacitor (C) arranged in the capacitive series branch and at the other end to the second and third RF resonant circuits (21, 31), respecitvely, the first series inductance (L1) being at least several times larger than each of the two other series (L2, L3) inductances.
REFERENCES:
patent: 2113157 (1938-04-01), Landon et al.
patent: 3593222 (1971-07-01), Rizzi
patent: 3980957 (1976-09-01), Putzer
patent: 4612571 (1986-09-01), Moon
Gensler Paul
Goodman Edward W.
U.S. Philips Corporation
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