A Low Profile Circularly Polarized Antenna based on Stepped Open-ended Slot Radiator
Keywords:Circularly polarized (CP) antenna, low profile, open-ended slotline, stepped slotline, feed network, wide band
A compact wide band and low profile circularly polarized antenna is presented based on stepped open-ended slotline in this paper. The antenna is composed of four open-end-slotted patchs and a feed network. Four open-end-slotted patchs are sequentially rotated and vertically soldered on the ground plane of the feed network, and are excited by a wide band transition from strip-line to slot-line with short pin in antenna element. The CP radiation of the proposed antenna is realized by four output ports of the feed network which transmit four signals that have equal amplitude with quadrature phase difference (00, 900, 1800, and 2700). Simulation results are compared with the measurements, and a good agreement is obtained. The measured results show that the proposed antenna can provide broad impedance bandwidth of 73.4% (3.5 GHz–7.56 GHz) (reflection coefficient less than -10 dB), a maximum gain of 4.74 dBi, and a 3-dB axial ratio (AR) bandwidth of about 35.1% (3.65 GHz–5.2 GHz).
I. Taha, K. Ayyuce, and S. ismail, “Circularly polarized microstrip patch antenna slits,”Appl. Comp. Electromagnetics Society (ACES) Conference, EM Simulations Using Sonnet-I, 2010.
Nasimuddin, Z. N. Chen, and X. M. Qing, “Asymmetric-circular shaped slotted microstrip antennas for circular polarization and RFID applications,” IEEE Trans. Antennas Propag., vol. 58, no. 12, pp. 3821-3828, 2010.
K. F. Tong and T. P. Wong, “Circularly polarized U-slot antenna,” IEEE Trans. Antennas Propag., vol. 55, no. 8, pp. 2382-2385, 2007.
S. Shekhawat, P. Sekra, D. Bhatnagar, V. K. Saxena, and J. S. Saini, “Stacked arrangement of rectangular microstrip patches for circularly polarized broadband performance,” IEEE Trans. Wireless Propag. Lett., vol. 9, pp. 910-913, 2010.
T. Mondal, S. Samanta, R. Ghatak, and S. R. B. Chaudhuri, “A novel hexagonal wideband circularly polarized stacked patch microstrip antenna,” Microwave Opt. Technol. Lett., vol. 57, no. 11, pp. 2548- 2554, 2015.
Z. B. Wang, S. J. Fang, S. Q. Fu, and S. L. Jia, “Single-fed broadband circularly polarized stacked patch antenna with horizontally meandered strip for universal UHF RFID applications,” IEEE Trans. Microw. Theory Tech., vol. 59, no. 4, pp. 1066- 1073, 2011.
A. R. Weily and N. Nikolic, “Circularly polarized stacked patch antenna with perpendicular feed substrate,” IEEE Trans. Antennas Propag., vol. 61, no. 10, pp. 5274-5278, 2013.
D. K. Singh, B. K. Kanaujia, S. Dwari, G. P. Pandey, and S. Kumar, “Novel quad-band circularly polarized capacitive-fed microstrip antenna for Cband applications,” Microwave Opt. Technol. Lett., vol. 57, no. 11, pp. 2622-2628, 2015.
S. L. S. Yang and K. M. Luk, “A wideband L-probes fed circularly-polarized reconfigurable microstrip patch antenna,” IEEE Trans. Antennas Propag., vol. 56, no. 2, pp. 581-584, 2008.
K. M. Luk, K. F. Lee, and H. W. Lai, “Development of wideband L-probe coupled patch antenna,”Appl. Comp. Electromagnetics Society (ACES) Journal, vol. 22, no. 1, pp. 620-625, 2007.
A. Kumar and M. V. Kartikeyan, “A circularly polarized stacked patch aperture coupled microstrip antenna for 2.6GHz band,” Int. J. Infrared Milli. Waves, vol. 28, no. 1, pp. 13-23, 2007.
P. Wang, G. Wen, J. Li, Y. Huang, L. Yang, and Q. Zhang, “Wideband circularly polarized UHF RFID reader antenna with high gain and wide axial ratio beamwideths,” Prog. Electromagn. Res., vol. 129, pp. 65-385, 2012.
C. Jin, Z. X. Shen, R. Li, and A. Alphones, “Compact circularly polarized antenna based on quarter-mode substrate integrated waveguide subarray,” IEEE Trans. Antennas Propag., vol. 62, no. 2, pp. 963-967, 2014.
K. K. M. Chan, A. E. C. Tan, and K. Rambabu, “Decade bandwidth circularly polarized antenna array,” IEEE Trans. Antennas Propag., vol. 61, no. 11, pp. 5435-5443, 2013.
Y. J. Hu, Z. M. Qiu, B. Yang, S. J. Shi, and J. J. Yang, “Design of novel wideband circularly polarized antenna based on Vivaldi antenna structure,” IEEE Trans. Wireless Propag. Lett., vol. 14, pp. 1662-1665, 2015.
M. H. Rasekhmanesh, A. Piroutiniya, and P. Mohammadi, “Wideband circularly polarized antenna array using sequential phase feed structure and U-shape radiating patch elements for S-band applications,” Microwave Opt. Technol. Lett., vol. 59, no. 11, pp. 2806-2812, 2017.
M. H. Rasekhmanesh, P. Mohammadi, and A. Piroutiniya, “A circularly polarized miniaturized array using combination of circle and rectangular lines in the sequential phase feed structure,” Appl. Comp. Electromagnetics Society (ACES) Journal, vol. 32, no. 4, pp. 339-343, 2017.