Broadband printed circuit antenna with direct feed

Communications: radio wave antennas – Antennas – Microstrip

Patent

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Details

343829, 343834, 343835, 343848, H01Q 138, H01Q 148

Patent

active

047194707

ABSTRACT:
A relatively broadband printed circuit antenna structure includes a dielectric sheet having printed circuit-like conductive structures printed on both sides in predetermined registration with one another. A traditional non-radiating microstrip transmission line structure extends from a common r.f. feedpoint to at least one terminal end portion. However, apertures disposed within the underlying (or overlying) conductive reference surface of the double-cladded printed circuit board in the vicinity of each terminal end cause substantial r.f. radiation to occur over a relatively broader bandwidth than with a more traditional microstrip antenna radiator structure. In one embodiment, the aperture in the microstrip ground plane itself becomes a radiating aperture due to the transmission line currents flowing within the ground plane. In other embodiments, the terminal end portion of the microstrip transmission line becomes a monopole radiator when it is encompassed by an aperture or opening in the pattern of the printed ground plane. A conductive reflector surface may also be disposed about one-fourth wavelength behind the printed ground plane--unless radiation directed away from either side of the antenna structure is desired.

REFERENCES:
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patent: 4486758 (1984-12-01), deRonde

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