Abstract
To reduce the number of driven elements in a broadside colinear antenna array, in narrowband applications COCO (coaxial colinear) antennas have been used since relatively recently, either as isolated elements, or as parts of antenna arrays. COCO antennas have a single actual port, but the driving voltage is transmitted to several other ports via transposed segments of a coaxial cable of which the antenna is made, resulting in approximately cophasal currents along the COCO antenna segments. This paper is aimed at demonstrating that COCO antennas are a special case of a new wide class of one-port, multiply-excited antennas (“OPOMEX” antennas), which can be in a variety of forms, including printed versions. The design of OPOMEX antennas is significantly more flexible than that of COCO antennas, since they have more parameters that in practical realizations can be varied easily. The paper describes two approximate methods for the analysis of OPOMEX antennas, and presents numerical and experimental results for a number of such printed-strip antennas. Numerical results are found to be in reasonable agreement with experiment.
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