Abstract
A Ka-band circularly polarized (CP) waveguide slot antenna with a cross iris is proposed. To achieve the CP characteristic (LHCP) in the antenna, a hexagonal shaped cavity is used. The impedance matching is improved by adjusting the sizes of the hexagonal cavity and a rectangular matching cavity. To enhance the axial ratio bandwidth, a cross iris is used with two arms of different lengths. From experimental results, the proposed antenna has a 3 dB axial ratio bandwidth of 6810 MHz (31.72 GHz–38.53 GHz). The −10 dB reflection coefficient bandwidth of the proposed antenna ranges from 31.51 GHz to 39.21 GHz (7700 MHz).
Highlights
Millimeter-wave communication systems support a higher data rate and larger capacity.Millimeter wave frequency has been widely used in various applications such as 5G mobile, radar, satellite, military, and automotive communications [1]
This paper proposes a Ka-band circularly polarized waveguide slot antenna with a cross iris
(31.72 GHz–38.53 GHz) and the fractional bandwidth is about 19.38%
Summary
Millimeter-wave communication systems support a higher data rate and larger capacity. There are some limitations in applying them to various applications since these antennas are relatively bulky and heavy They are not suitable for array systems because a large space is required for polarizers to be installed [10]. Such antennas are not appropriate for satellite communication systems requiring a high gain array structure with compact size To overcome these drawbacks of bulk and mass, various types of circular polarized waveguide slot antennas have been studied [11,12,13,14,15,16,17]. Waveguide inclined slot, crossed slot, and v-type slot antennas have been widely used for CP array antennas to generate circularly polarized waves with high gain [13,14,15,16,17].
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