Communications: radio wave antennas – Antennas – Microstrip
Patent
1985-05-13
1988-01-12
Nussbaum, Marvin L.
Communications: radio wave antennas
Antennas
Microstrip
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.
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Alberding Gilbert E.
Ball Corporation
Nussbaum Marvin L.
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