A Wideband and Wide Axial Ratio Bandwidth Circularly Polarized Antenna Loaded with Circular Ring Slot

Patil, Shilpee; Verma, Alka; Pandey, Anil Kumar; Kesarwani, Amit Kumar; Pandey, V. K.; Kapse, Vinod M.

doi:10.1590/2179-10742022v21i4264867

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Article • J. Microw. Optoelectron. Electromagn. Appl. 21 (4) • Oct-Dec 2022 • https://doi.org/10.1590/2179-10742022v21i4264867 copy

A Wideband and Wide Axial Ratio Bandwidth Circularly Polarized Antenna Loaded with Circular Ring Slot

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The presented model for wideband circularly polarized microstrip antenna is an improved version of the previous models which is widely applicable to satellite, microwave relay and radar. The designed circularly polarized antenna having overall volume of 20× 20 × 1.6 mm³ actively works at the impedance bandwidth of 9000 MHz (4.0–12.9 GHz) having 105%(with 8900 MHz taken as center frequency). The 3-dB axial ratio bandwidth is obtained as 5500 MHz (5.4–10.9 GHz) depicting 67.5% (with 8150 MHz taken as the center frequency). Measured results of impedance bandwidth, axial ratio, gain and VSWR agrees to the simulation results.

Index Terms
Bandwidth; Compact Antenna; Ring Slot; Wideband

Parameters	Antenna I	Antenna II	Proposed Antenna
Impedance Bandwidth(MHz)	4600	7000	9000
Axial Ratio Bandwidth(MHz)	600	-	4960

Ref.	Antenna Type	ƒ_c (MHz)	3-db Axial ratio Bandwidth (%)	Antenna size (mm × mm), λ_o²
[ ⁷[7] J. Sze, J. Wang and C. Chang, "Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna, " Electronics Letters, vol. 44, no. 18, pp. 1048, 2008. ]	WS	2220	30.6	60 × 60, 0.197
[ ⁸[8] J. Sze and C. Chang, "Circularly Polarized Square Slot Antenna with a Pair of Inverted-L Grounded Strips," IEEE Antennas and Wireless Propagation Letters, vol. 7, pp. 149-151, 2008. ]	WS	2413	28.8	60 × 60, 0.233
[ ⁹[9] T. Chang, "Circularly polarized antenna for 2.3-2.7 GHz WiMax band," Microwave and Optical Technology Letters, vol. 51, no. 12, pp. 2921-2923, 2009. ]	WS	2500	16.0	30 × 46, 0.096
[ ¹¹[11] Q. Chu and S. Du, "A CPW-fed broadband circularly polarized square slot antenna," Microwave and Optical Technology Letters, vol. 52, no. 2, pp. 409-412, 2009. ]	RS	2165	32.8	60 × 60, 0.187
[ ¹²[12] S. Yeung, K. Man and W. Chan, "A Bandwidth Improved Circular Polarized Slot Antenna Using a Slot Composed of Multiple Circular Sectors," IEEE Transactions on Antennas and Propagation, vol. 59, no. 8, pp. 3065-3070, 2011. ]	RS	3030	57.4	106.5 × 106.5, 1.157
[ ¹³[13] T. Chang, "Wideband circularly polarised antenna using two linked annular slots," Electronics Letters, vol. 47, no. 13, pp. 737-739, 2011. ]	RS	3000	46.7	65 × 35, 0.228
[ ¹⁴[14] J. Pourahmadazar, C. Ghobadi, J. Nourinia, N. Felegari and H. Shirzad, "Broadband CPW-Fed Circularly Polarized Square Slot Antenna with Inverted-L Strips for UWB Applications," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 369-372, 2011. ]	WS	5790	32.2	60 × 60, 1.341
[ ¹⁵[15] N. Felegari, J. Nourinia, C. Ghobadi and J. Pourahmadazar, "Broadband CPW-Fed Circularly Polarized Square Slot Antenna with Three Inverted-L-Shape Grounded Strips," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 274-277, 2011. ]	WS	3575	85.0	60 × 60, 0.511
[ ¹⁶[16] J. Sze and S. Pan, "Design of CPW-Fed Circularly Polarized Slot Antenna with a Miniature Configuration," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 1465-1468, 2011. ]	WS	1575	3.81	60 × 60, 0.099
[ ¹⁸[18] J.-Y. Jan, C.-Y. Pan, K.-Y. Chiu, and H.-M. Chen, “Broadband CPW-Fed Circularly-Polarized Slot Antenna with an Open Slot,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 3, pp. 1418–1422, 2013. ]	RS	3700	27	50 × 50, 0.381
[ ¹⁹[19] M. S. Ellis, Z. Zhao, J. Wu, X. Ding, Z. Nie, and Q.-H. Liu, “A novel simple and compact microstrip-fed circularly polarized wide slot antenna with wide axial ratio bandwidth for C-band applications,” IEEE Transactions on Antennas and Propagation, vol. 64, no. 4, pp. 1552–1555, 2016. ]	WS	5750	40	25 × 25, 0.230
Proposed	RS	8150	67.5	20 × 20, 0.122

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