以垂直置放結構提升平面天線的隔離度

本研究探討以一種小型裝置的垂直置放結構的MIMO雙頻天線的操作下之隔離度提升設計， MIMO天線將由兩個不同的天線元件組成，天線的元件為一個具有偶極天線當負載的狹縫(slit)，其中激發槽狹縫將負責低頻帶(2.4GHz) ，偶極負載則負責高頻帶5~6GHz，將兩個同樣的天線元件以極化分集(垂直)的方式置放，藉由天線極化特性可以導致天線之間的互偶量相對減少，並討論幾個不同的設計技巧用以探究將隔離度進一步提升的可能性。模擬與實測結果顯示，在共同接地面引進狹長槽孔的垂直置放天線結構，能有效抑制耦合，避免MIMO天線元件的相互干擾；此設計技巧不需額外的主被動元件，亦可減少所需的FR4基板尺寸，且此設計能符合S參數S11<-10dB,S12<-20dB的業界需求，其應用範圍涵蓋IEEE(802.11a/b/g/n/ac)等WLAN頻段。

關鍵字

隔離度；垂直置放；雙頻天線

並列摘要

This thesis is to investigate the MIMO dual-band antenna design for the isolation improvement with two antenna elements perpendicularly placed in a small device. The MIMO antenna consists of two antenna elements, of which each element consists of two antenna components: one is a narrow slit antenna, which is responsible for the radiation at low band (2.4GHz), the other is a dipole antenna, which serve as the load of the previous narrow slit antenna and is responsible for the high-band (5~6GHz). These two antenna elements are perpendicularly placed in order to achieve the polarization diversity, such that the coupling between the antenna elements can be reduced. In this thesis, several different design techniques are explored for the possibility to further enhance the isolation. Simulated and experimental results show that the introduction of a narrow slit, in the common ground plane of the two planar antenna elements placed perpendicularly, can effectively inhibit the coupling to avoid mutual interference of the MIMO antenna element. This design skill can reduce the FR4 substrate size required, and doesn't need additional active and/or passive components. Also, this antenna design is able to meet the industry demands of S-parameter (|S11|<-10dB, |S12|<-20dB), and its scope of application covers IEEE (802.11a / b / g / n / ac) WLAN band.

並列關鍵字

Isolation ； Perpendicularly placed ； MIMO Antenna

參考文獻

[14] 林文彥， ”符合IEEE 802.16e-2005標準的移動式WiMAX多頻帶(2.4-6GHz)小型天線的設計” 碩士論文，淡江大學電機工程學系， 2004年 6月

[6] Jungsik Park ; Mobile Commun. Div.， Samsung Electron. Co.， Ltd.， Suwon， South Korea ; Jiyong Park ; Junho Choi ; Young-Sik Kim， “Ground Slot with Capacitor for High Isolation between MIMO antenna，” in Proc. Mediterranean Microwave Symposium (MMS)， 2011 11th， paper 11.3.4， pp. 197-200.

[2]H. Carrasco， H. D. Hristov， R. Feick， and D. Cofre， “Mutual coupling between planar inverted-F antennas，” Microw. Opt. Technol. Lett.， vol.42， no. 3， pp. 224–227， Aug. 2004.

[3]Yanshan Gou; Shiwen Yang ;Zaiping Nie， “Wideband Dual-Polarized Printed Dipole Antenna with high Isolation ，” in proc. Cross strait Quad-Regional Radio Science and Wireless Technology Conference(CSQRWC)，2013，paper 11.3.4，p.219-221

[4]M.Karaboikis，C. Soras， Member， IEEE， G Tsachtsiris，and V. Makios， Senior Member，IEEE，“Compact dual-Printed Inverted-F Antenna Diversity System for Portable Wireless Devices”， IEEE antenna and wireless propagation letters， VOL. 3， 2004

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以垂直置放結構提升平面天線的隔離度

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