A tactical broadband omnidirectional antenna

In this paper, a vertically polarized broadband antenna with an adjustable shape for specific applications in the VHF and UHF bands is proposed. This antenna is a compact monopole with a pseudo-conical shape set on a rectangular ground plane, partially made of wire netting. A part of the radiating e...

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Bibliographic Details
Main Authors: Palud, S., Colombel, F., Himdi, M., Le Meins, C.
Format: Conference Proceeding
Language:English
Subjects:
Antenna measurements
Antenna radiation patterns
Azimuthal plane
Bandwidth
Broadband antennas
Frequency
Impedance matching
Shape
UHF antennas
Wire
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Description
Summary:In this paper, a vertically polarized broadband antenna with an adjustable shape for specific applications in the VHF and UHF bands is proposed. This antenna is a compact monopole with a pseudo-conical shape set on a rectangular ground plane, partially made of wire netting. A part of the radiating element is made of metallic pipes which are bent to minimize the height of the shape without deteriorating the impedance matching. The bent pipes and the wire netting of the ground plane can be removed in order to dramatically reduce the size of the antenna for applications in high-frequency range. As a result, two compact structures relatively to the wavelength are obtained with a vertical size of respectively lambda LF /6.25 for the low-frequency mode (100-500 MHz) and lambda LF /7.2 for the high-frequency mode (415-915 MHz) (lambda LF is the wavelength associated to the lowest frequency of the covered bandwidth). The structures operate with good gain and radiation patterns in both E- planes and H-planes.
ISSN:2165-4727
2165-4743
DOI:10.1109/APMC.2008.4958514