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Investigation of circular polarization technique in Q-slot antenna

  • Amer T. Abed (a1), Mandeep S. J. Singh (a2) and Aqeel M. Jawad (a3)

Abstract

This paper describes and analyzes a new technique used in Q-slot antenna to generate circular polarization (CP). The CP characteristics were investigated carefully by studying the surface current distribution, the phase difference between the left hand circular polarization (LHCP) and right hand circular polarization (RHCP) at some resonant frequencies, and the measured values of the axial ratio bandwidth (ARBW). Normal arms (E1 and E2) were cut in the upper elliptical feeding strip line to form an open-mouth structure. The arms E1 and E2 were made equal in length and set perpendicular to each other to have normal electric fields, leading to the generation of CP radiation. A formula was modified for the dual resonant frequencies f1, f2 of the modes TM010 and TM001. The measured values of the ARBW indicated that the antenna has a wide ARBW of 4.8–5.93 GHz, which is approximately 52% of the 3rd operating band of 4.7–6.8 GHz. The wide ARBW in a small size indicated that the design of the Q-slot antenna overcame the limits of designing antennas with wide ARBW in small size and low profile. A formula for normalized field was driven according to the complementary of the Q-slot antenna.

Copyright

Corresponding author

Author for correspondence: Amer T. Abed, E-mail: amer.t.abed@ieee.org

References

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1.Abed, AT, Singh, MJ and Islam, MT (2017) Dual crescent-shaped slot antenna fed by circular polarization into dual orthogonal strip line. IET Microwaves, Antennas & Propagation 11, 21292133.
2.Ge, L, Sim, CD, Su, HL, Lu, JU and Ku, C (2018) Single-layer dual-broadband circularly polarized annular-slot antenna for Wlan applications. IET Microwaves, Antennas & Propagation 12, 99107.
3.Wangwang, H, Yang, F, Long, R, Zhou, L and Yan, F (2016) Single-fed low-profile high-gain circularly polarized slotted cavity antenna using a high-order mode. IEEE Antennas and Wireless Propagation Letters 15, 110113.
4.Zhou, CF and Cheung, SW (2017) A wideband CP crossed slot antenna using 1-λ resonant mode with single feeding. IEEE Transactions on Antennas and Propagation 65, 42684273.
5.Abed, AT, Singh, MJ and Islam, MT (2016) Amer Fractal Slot Antenna with Quad Operating Bands High Efficiency for Wireless Communication. The IEEE 3rd International Symposium on Telecommunication Technologies (ISTT), Malaysia, pp. 68.
6.Chetna Sharma, SM and Vishwakarma, DK (2017) Miniaturization of spiral antenna based on fibonacci sequence using modified Koch curve. IEEE Antennas and Wireless Propagation Letters 16, 932935.
7.Abed, AT and Singh, MJ (2016) Slot antenna single layer fed by step impedance strip line for Wi-Fi and WiMAX applications. Electronics Letters 52, 11961198.
8.Stutzman, WL and Thiele, GA (2012) Antenna Theory and Design, 3rd Edn. Hoboken: John Wiley & Sons, Inc.

Keywords

Investigation of circular polarization technique in Q-slot antenna

  • Amer T. Abed (a1), Mandeep S. J. Singh (a2) and Aqeel M. Jawad (a3)

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