Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1987-01-15
1989-02-14
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455280, 343788, 343867, H04B 118, H01Q 2100
Patent
active
048052329
ABSTRACT:
A ferrite core antenna for use in the VHF and UHF range has a first coil on the core which is connected to a capacitance selected to resonate with the inductance of the coil at the desired frequency of operation. The ferrite core antenna also has a second coil for providing a signal to the input stage of a radio receiver. In contrast to conventional loopstick antennas for low frequencies, the operation of the ferrite core antenna in the VHF to UHF range is remarkably improved by using an input stage having a relatively high input impedance and using a greater number of turns in the second coil than the first which is tuned instead of the second. Preferably the first coil is centrally disposed and has a single turn in the form of a relatively wide band of conductive metal foil, and the second coil is offset by a certain distance from the first coil and feeds an input signal to the gate of a gallium arsenide field-effect transistor. For operation in the FM broadcast band, the ferrite core preferably has dimensions of 7 cm.times.1 cm.times.1.5 cm, and the second coil has about three turns. So that the first coil has a sufficiently high Q, the capacitance for resonating the first coil is provided by a number of capacitors connected in parallel.
REFERENCES:
patent: 3573628 (1971-04-01), Cramer, Jr. et al.
patent: 3665476 (1972-05-01), Taylor
patent: 3736591 (1973-05-01), Rennels et al.
patent: 4103241 (1978-07-01), Najork
patent: 4270128 (1981-05-01), Drewett
patent: 4314378 (1982-02-01), Fowler et al.
patent: 4407000 (1983-09-01), Sasaki et al.
patent: 4458248 (1984-07-01), Lyasko
Henry Jasik, Antenna Engineering Handbook, 1st ed. McGraw Hill, New York, 1961, pp. 28-8 to 28-11.
R. C. Johnson & H. Jasik Antenna Engineering Handbook, 2nd ed., McGraw-Hill, New York, 1984, pp. 5-4 to 5-9 and 6-9 to 6-14.
Griffin Robert L.
Rudisill Stephen G.
Smith Ralph E.
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