BroadBand aerial means

Details BroadBand aerial means BroadBand aerial means

1998-04-10

2000-03-14

Vu, David H.

Communications: radio wave antennas

Antennas

With radio cabinet

895900, H01Q 924

Patent

active

060379065

ABSTRACT:
The invention relates to a broadband antenna having a first and a second helical antenna (203, 207) wherein the antennas (203, 207) have different resonance frequencies. An antenna which has essentially a larger bandwidth than the bandwidth of an individual helical antenna is formed in coaction between the helical antennas (203, 207), by arranging the antennas coaxially and in generally the same axial positions, wherein the helical antennas (203, 207) are separated galvanically, possibly with the exception of at respective supply points. When fitted to portable equipment, the helical antennas (203, 207) can be combined with an axially movable straight wire antenna.

REFERENCES:
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patent: 5504494 (1996-04-01), Chatzipetros et al.
patent: 5594457 (1997-01-01), Wingo
patent: 5771023 (1998-06-01), Engblom
patent: 5856808 (1999-01-01), Holshouser et al.
Derwent's Abstract, No. 93-366142/46, Week 9346, Abstract of SU, 1758726, Aug. 30, 1992.

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