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US 5,489,913 AGranted
Miniaturized radio antenna element
AssigneeAlcatel Espace
InventorsGerard Raguenet, Michel Gomez-Henry
Life of this patent
Estimating the term…
Abstract
A miniaturized radio antenna element for use at VHF and UHF is designed to operate well short of resonance. It comprises a small flat cavity in the surface of which is formed at least one radiating slot very much smaller than a normal resonant slot. However, an impedance matching circuit is often required at the ports of this antenna.
Claims14
A miniaturized radio slot antenna element suitable for use with signals at VHF and UHF, comprising:
- at least one non-resonant radiating slot having a total length dimension in the range of approximately .lambda./10 to .lambda./20, so that the total length dimension is very much less than that of a normally resonant slot for an operating frequency of the antenna element which therefore operates well short of resonance at said operating frequency having a wavelength .lambda., said slot being formed in one of two larger sides of an operating cavity which is also very much smaller, by about an order of magnitude or a factor of 10, than a resonant cavity at said operating frequency;
- and
- a coupling means for coupling at least one signal port of the antenna element to a respective main signal feed line through at least one impedance matching circuit.
Dependencies are inferred from the claim text.