Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1982-02-19
1985-01-22
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343748, 343768, 343895, H01Q 136, H01Q 1318
Patent
active
044955030
ABSTRACT:
Slow wave antenna including slow wave structure of a helical coiled conductor having linear capacitance and inductance distribution. Driving point impedance is changed by varying the ratio of the distributive capacitance to the distributed inductance. Tuning is changed by changing the capacitance between the distributive capacitance common and RF ground. Slow wave antenna structure includes a first embodiment having a slotted pipe with a helically wound conductor and a second embodiment includes a helically coiled element with a plane capacitance structure. In the slotted type of helically wound center conductor antenna, the antenna is tuned by changing the distance between the helix and the outside diameter of the pipe. The antenna is also tuned by changing the capacitance between the pipe and the ground of the RF system. In the helical element with a plane capacitance sheet antenna, tuning is accomplished by varying the spacing of the sheet and hence the capacitance between a conductive sheet and the helix.
REFERENCES:
patent: 2816285 (1957-12-01), Topol
patent: 2866197 (1958-12-01), Kandoian
patent: 3573840 (1971-04-01), Gouillou
patent: 3757345 (1973-09-01), Carver
patent: 3824600 (1974-07-01), Majkrzak et al.
patent: 3852759 (1974-12-01), Felsenheld
patent: 3909757 (1975-09-01), Miyamoto et al.
patent: 4101899 (1978-07-01), Jones, Jr. et al.
The "ARRL Antenna Book", 14th edition, Chapter 10, pp. 10-11, 10-12.
Jaeger Hugh D.
Lieberman Eli
Wimer Michael C.
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