No / It is shown that a conical beam 5.2-GHz antenna suitable
for HIPERLAN application, but working in horizontal polarization,
can be realized as a group of microstrip patch radiators
in a ring formation. Layouts with three and four patches are described,
and radiation patterns are found to agree well with predictions
from a simple array model. The three-patch form is smaller
and gives a closer approximation to an azimuth-independent pattern.
Patterns are very similar to those achieved in vertical polarization
with previously reported disk antenna realizations, giving
peak radiation at about 50 elevation. Two methods of impedance
matching are found to give satisfactory results. A dual-polarized
conical-beam microstrip antenna, with a strictly uniplanar conductor
pattern, is also presented and realized as an array of three
square patches whose corners meet a central feed point. For the
second polarization, the antenna functions as a series fed array.
Fairly good conical beam patterns have been obtained, though only
moderate polarization purity appears to be obtainable from threeelement
arrays.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/2746 |
| Date | January 2003 |
| Creators | Gardiner, John G., Abd-Alhameed, Raed, Excell, Peter S., McEwan, Neil J., Ibrahim, Embarak M. |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Article, No full-text in the repository |
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