Circularly polarized printed array antenna composed of end‐fed strip dipoles and slots

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Abstract
Recently, many attempts have been made to increase the bandwidth and the gain of circularly polarized antennas constructed on printed circuit boards. In a previous paper, a wide bandwidth was achieved for a circularly polarized array antenna composed of strip dipoles and slots (CP‐PASS), although its actual gain was rather low. In the present paper, the gain of CP‐PASS is enhanced by adopting an end‐fed strip dipole as a strip element, and a basic design procedure and some experimental results of CP‐PASS are shown. First, it is verified by experiments that the end‐fed strip dipole has some advantages; for example, it has a sufficient gain, its crosspolar radiation level is low, and it is easy to control the radiation resistance. Second, an approximate analysis is made for a basic radiating‐element pair for CP‐PASS, and a basic design procedure of CP‐PASS is obtained by applying the analysis. Finally, several CP‐PASS are made and measured, and the design procedure is found to be useful. For a six‐pair CP‐PASS, its actual gain, 3‐dB gain bandwidth, and axial‐ratio bandwidth are about 12 dBi, 11% and 12%, respectively. It is found also that CP‐PASS requires only a slight correction to the element lengths when a reflector is placed. In addition, it is obtained that the gain of CP‐PASS may be increased further.

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