Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1994-07-26
1996-02-06
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343819, 343846, H01Q 1910
Patent
active
054899141
ABSTRACT:
A multiple-frequency monopole or dipole antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint includes a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint. A number n of additional non-driven conductors, wherein n is at least one, resonant at respective n arbitrary predetermined frequencies different from the first frequency are disposed in substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple the driven and non-driven conductors and produce a non-reactive impedance at the feedpoint at the first and at each n additional frequency. Preferably, the predetermined spacing of the driven and non-driven conductors is determined according to the equation: ##EQU1## where d.sub.1n is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at the n frequency, D is the diameter of the driven and non-driven conductors, expressed in wavelengths at the n frequency, Z.sub.0 is the desired impedance at the n frequency when the antenna element is a dipole, or twice the desired impedance when the antenna element is a monopole, F.sub.1 is the resonant frequency of the driven conductor, and F.sub.n is the resonant frequency of the n non-driven conductor.
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Hajec Donald T.
Ho Tan
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