Isolation enhancement in Chinese character antenna array using simple defect ground structure

Abstract

This article presents the Gui-shaped Chinese character array antenna (GCCAA), which is loaded with the L-shaped defect ground structure (LDGS) to improve isolation between the antennas. The GCCAA is obtained by arranging two Tu-shaped antennas up and down. By etching a pair of LDGS on the ground, the direction of the coupling current is changed on the ground. Most importantly, the LDGS is not etched in the middle of the antenna elements, but loaded along the outer edge of the GCCAA, which not to destroy the appearance of the GCCAA and maintain the compact nature of the Chinese character. The measured results show that LDGS improves isolation from 15.4 to 37.4 dB when the antennas are placed with a 0.065 λ 0 edge-to-edge distance. Meanwhile, it has little influence on reflection coefficient and radiation patterns. The decoupling technique is simple and straightforward which can be easy applied in Chinese character array antenna. K E Y W O R D SChinese character array antenna, defect ground structure, isolation enhancement, mutual coupling

A Jia-shaped artistic patch antenna for dual-band circular polarization

“…It is therefore very meaningful to have the Chinese character Jia-shaped patch antenna presented in this article. The patch antennas embed Chinese character(s) into the antenna design, combining Chinese culture and antenna technology to realize the application of hidden antenna technology [3][4][5][6][7][8][9][10][11][12] that is suitable for indoor wireless communications to date. Chinese hieroglyphs are the crystallization of the wisdom of the Chinese nation.…”

“…They are a kind of inheritance, the most vivid and the most well preserved characters of the ancestors, and are their original way of describing things. A novel wideband Wang-shaped patch array was initially proposed in [4], whereas the Zhong-and the Guo-shaped artistic patch antenna were studied and developed in various contributions [5][6][7][8][9]. Later on, the two-element Zhong-Guo array was also presented with good radiation characteristics [10][11].…”

A Guo‐shaped patch antenna for hidden WLAN access points

“…The first Chinese‐character‐shaped patch antenna, Wang‐shaped patch was presented in 2010 8 . A few years later, other interesting shapes of Chinese character were proposed for CP, 9 LP, 10 reconfigurable CP 11 and mm‐wave applications 12 . More recently, a Jia ‐shaped patch antenna was also reported for dual‐band CP applications, 13 where its frequency band ratio can be adjusted.…”

“…However, most of the reported CP antennas focus on the technical performance, for instance, wide bandwidth and high gain, 3,6 dual polarization, 4,5,7 rather than the hidden functionality. Recently, patch antennas embed Chinese character(s) into the antenna designs become popular, [8][9][10][11][12][13][14] which realized the hidden antennas that are suitable for indoor wireless communications to date. The first Chinesecharacter-shaped patch antenna, Wang-shaped patch was presented in 2010.…”