1. Alford, A., A. G. Kandoian, et al. "Ultrahigh-frequency loop antennas," IEEE Trans. AIEE, Vol. 56, No. 12, 843-844, Dec. 1940. Google Scholar
2. Lin, C.-C., L.-C. Kuo, H.-R., Chuang, et al. "A horizontally polarized omnidirectional printed antenna for WLAN applications," IEEE Trans. Antennas Propag., Vol. 54, No. 11, 3551-3556, Nov. 2006.
doi:10.1109/TAP.2006.884307 Google Scholar
3. Fenn, C., et al. "Arrays of horizontally-polarized loop-fed slotted cylinder antennas," IEEE Trans. Antennas Propag., Vol. 33, No. 4, 375-382, Jan. 1985.
doi:10.1109/TAP.1985.1143597 Google Scholar
4. Li, W. W., K. W. Leung, et al. "Omnidirectional circularly polarized dielectric resonator antenna with TOP-loaded alford loop for pattern diversity design," IEEE Trans. Antennas Propag., Vol. 61, No. 8, 4246-4256, 2007.
doi:10.1109/TAP.2013.2262072 Google Scholar
5. Kim, D. S., C. H. Ahn, Y. T. Im, S. J. Lee, K. C. Lee, W. S. Park, et al. "A windmill-shaped loop antenna for polarization diversity," IEEE Trans. Antennas Propag. — Soc. Int. Symp., 361-364, Honoluu, HI, Jun. 2007. Google Scholar
6. Wei, K., K., Z. Zhang, Z. Feng, M. F. Iskander, et al. "A MNG-TL loop antenna array with horizontally polarized omnidirectional patterns," IEEE Trans. Antennas Propag., Vol. 60, No. 6, 2702-2710, Apr. 2012.
doi:10.1109/TAP.2012.2194643 Google Scholar
7. Wei, K., Z. Zhang, Z. Feng, et al. "Design of a wideband horizontally polarized omnidirectional printed loop antenna," IEEE Antennas Wireless Propag. Lett., Vol. 11, 49-52, Jan. 2012. Google Scholar
8. Balanis, C. A., Antenna Theory: Analysis and Design, 4th edition, Wiley-Interscience, Hoboken, NJ, USA, 2016.
9. Brachat, P. and C. Sabatier, "Wideband omnidirectional microstrip array," Electron Lett., Vol. 37, No. 6, 2-3, Feb. 2016.
doi:10.1109/LED.2016.2564580 Google Scholar
10. Cai, X. Z., K. Sabatier, et al. "A compact broadband horizontally polarized omnidirectional antenna using planar folded dipole elements," IEEE Trans. Antennas Propag., Vol. 64, No. 2, 414-422, Feb. 2016.
doi:10.1109/TAP.2015.2504457 Google Scholar
11. Wang, Z. D., Y. Z. Yin, X. Ying, J. J. Wu, et al. "Design of a wideband horizontally polarized omnidirectional antenna with mutual coupling method," IEEE Trans. Antennas Propag., Vol. 63, No. 7, 3311-3316, Jul. 2015.
doi:10.1109/TAP.2015.2429733 Google Scholar
12. Quan, X. L., R. L. Li, et al. "A broadband dual-polarized omnidirectional antenna for base stations," IEEE Trans. Antennas Propag., Vol. 61, No. 2, 943-947, Feb. 2013.
doi:10.1109/TAP.2012.2223450 Google Scholar
13. Zhang, H., Y. Zhang, F. Zhang, T. Li, C. Li, et al. "Bandwidth enhancement of a horizontally polarized omnidirectional antenna by adding parasitic strips," IEEE Trans. Antennas Propag., Vol. 16, 880-883, Sep. 2017.
doi:10.1109/LAWP.2016.2613875 Google Scholar
14. Fan, K., Z. C. Hao, J. Yuan, G. Q. Hu, W. Hong, et al. "Wideband horizontally polarized omnidirectional antenna with a conical beam for millimeter-wave applications," IEEE Trans. Antennas Propag., Vol. 66, No. 9, 4437-4448, Jun. 2018.
doi:10.1109/TAP.2018.2851363 Google Scholar
15. Liu, Y., J. Xue, H. Wang, S. Gong, et al. "Low-profile omnidirectional dual-polarised antenna for 2.4GHz WLAN applications," Electron Lett., Vol. 50, No. 14, 975-976, Jul. 2014.
doi:10.1049/el.2014.1146 Google Scholar
16. Huang, H., Y. Liu, Gong, et al. "Broadband dual-polarized omnidirectional antenna for 2G/3G/LTE/WiFi applications," IEEE Antennas Wireless Propag. Lett., Vol. 15, 576-579, Jul. 2015. Google Scholar
17. Ziolkwski, R. W., P. Jin, C. C. Lin, et al. "Metamaterial-inspired engineering of antennas," Proc. IEEE, Vol. 99, No. 10, 1720-1731, Oct. 2011.
doi:10.1109/JPROC.2010.2091610 Google Scholar
18. Khaleel, H. R., H. M. Al-Rizzo, D. G. Rucker, S. M. Mohan, et al. "A compact polyimide-based UWB antenna for flexible electronics," IEEE Antennas Wireless Propag. Lett., Vol. 11, 564-567, May 2012.
doi:10.1109/LAWP.2012.2199956 Google Scholar
19. Li, R. L., T. Wu, B. Pan, K. Lim, J. Laskar, M. M. Tentzeris, et al. "Equivalent-circuit analysis of a broadband printed dipole with adjusted integrated balun and an array for base station applications," IEEE Trans. Antennas Propag., Vol. 57, No. 7, 2180-2184, May 2009.
doi:10.1109/TAP.2009.2021967 Google Scholar
20. Gupta, K. C., R. Garg, I. Bahl, and P. Bhartia, Microstrip Line and Slotlines, 2th edition, Artech House, London, Boston, USA, 2016.
21. Janaswamy, R., D. H. Schaubert, et al. "Characteristic impedance of a wide slotline on lowpermittivity substrates," IEEE Trans. Microw. Theory Tech., Vol. 34, No. 8, 900-902, Aug. 1986.
doi:10.1109/TMTT.1986.1133465 Google Scholar
22. Pozar, D. M., Microwave Engineeing, 4th edition, John Wiley & Sons, New York, USA, 2011.
23. Makimoto, M. and S. Yamashita, Microwave Resonators and Filters for Wireless Communication: Theory, Design and Application, Springer, Berlin, Germany, 2001.
24. Luo, P., Y. Cui, R. Li, et al. "Novel multiband/broadband horizontally polarized omnidirectional antennas," IEEE International Symposium on Antennas and Propagation (APSURSI) 2016, Jul. 2016. Google Scholar
25. Ahn, C.-H., S.-W. Oh, K. Chang, et al. "A dual-frequency omnidirectional antenna for polarization diversity of MIMO and wireless communication applications," IEEE Antennas Wireless Propag. Lett., Vol. 8, 966-969, Aug. 2009. Google Scholar
26. Ando, A., N. Kita, W. Yamada, et al. "2.4/5-GHz dual-band vertically/horizontally dual-polarized omnidirectional antennas for WLAN base station," IEEE Antennas and Propagation Society International Symposium 2008, Jul. 2008. Google Scholar
27. Lai, J., B. Feng, Q. Zeng, S. Su, et al. "A dual-band dual-polarized omnidirectional antenna for 2G/3G/LTE indoor system applications," IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) 2018, Sep. 2018. Google Scholar