Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1996-01-30
1998-08-04
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343745, 343790, 343820, H01Q 916
Patent
active
057900817
ABSTRACT:
A feed line is coupled to a driven element of an antenna using capacitive coupling elements, such as coupling rods, coupling wires, or conductive tape. The capacitive coupling elements allow signal transfer to or from the radiating element at an optimal transfer point, despite the fact that the optimal transfer point varies with respect to frequency. Conductive extensions may be electrically connected to the capacitive coupling elements to increase the available capacitive coupling. The constant impedance matching system provides a broader frequency response and lower standing wave ratio (SWR) to create a more efficient signal transfer to or from the driven element. A switch may be provided to directly connect and disconnect the capacitive coupling elements from the driven element and allow a choice between the broader frequency response with a flatter SWR curve and a focused frequency response with a sharper SWR curve. Also, use of capacitive coupling elements reduces the frequency consciousness of an antenna and allows radiating phasing lines to connect a driven element to a secondary element to drive the secondary element in phase or out of phase with the driven element.
REFERENCES:
patent: 2945227 (1960-07-01), Broussard
patent: 3594797 (1971-07-01), Pereda
patent: 3611397 (1971-10-01), Poliakoff
patent: 3713166 (1973-01-01), Munson et al.
patent: 4564843 (1986-01-01), Cooper
patent: 4785308 (1988-11-01), Neucomb
patent: 4893131 (1990-01-01), Smith et al.
patent: 5473336 (1995-12-01), Holman et al.
The ARRL Handbook for Radio Amateurs, 17-1 to 17-22 (The American Radio League 1992).
Hajec Donald T.
Phan Tho
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