Sleeved monopole antenna

Details Sleeved monopole antenna Sleeved monopole antenna

1991-10-18

1993-07-27

Hille, Rolf

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343895, H01Q 9320, H01Q 11080

Patent

active

052314120

ABSTRACT:
An antenna (100) includes a quarter-wave monopole radiating element (110, 110') having a signal feed point end (110A). The antenna (100) further includes a reactive element (150) in the form of a conductive sleeve. The sleeve (150) includes a grounding end (150A) and is coaxially positioned around a portion of the monopole radiating element (110, 110'). A spacer (140) is coaxially situated between the monopole radiating element (110, 110') and the reactive element (150), for electrically insulating the monopole radiating element (110, 110') from the reactive element (150). The spacer (140) is sufficiently dimensioned such that the monopole radiating element is tightly coupled to the reactive element (150) at substantially around the feed point end (150A).

REFERENCES:
patent: 2239724 (1941-04-01), Lindenblad
patent: 2418961 (1947-04-01), Wehner
patent: 2487567 (1949-11-01), Lindenblad
patent: 2492404 (1949-12-01), Strelb et al.
patent: 2704811 (1955-03-01), Walters
patent: 3383695 (1968-05-01), Jarek
patent: 3932873 (1976-01-01), Garcia
patent: 4097867 (1978-06-01), Eroncig
patent: 4644366 (1987-02-01), Scholz
patent: 4730195 (1988-03-01), Phillips et al.
patent: 4772895 (1988-09-01), Garay et al.
patent: 4800395 (1989-01-01), Balzano et al.
Translation of Japan Kokai Publication 0082246 (Jul. 1978) to Takahashi 9 pages.
Textbook: Stutzman, "Antenna Theory and Design" pp. 261-270.

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