This paper presents novel configuration of wideband microwave circular polarization antenna. This array antenna is composed of four units of three elements plane antennas. This unit antenna is composed of three circular elements of feed and reactance elements on a ground plane. The unit antenna is composed of a feed and a reactance elements on a ground element. The feed element is made of a disc truncated at both sides to separate generation of higher and lower frequencies (fH and fL), Four units of the above antenna are applied to the orthogonal array antennas. Two types of spatial arrangements with four unit antennas are given with individual routing wire circuits. Wideband characteristics of circular polarization are achieved extremely wide bandwidth 10% compared to 2.2 ~ 2.4 % bandwidth by conventional parallel arrangements. This result was brought by the original configuration of the unit antenna with three elements. Keywords— Separation of degeneration, Circular polarization, Axial ratio, Three-element-structure.
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