本論文針對被動切換匹配電路天線設計之應用，首先提出一種雙饋入LTE/WWAN平板電腦天線設計，該設計透過被動切換匹配電路使天線在簡單結構下產生雙寬頻帶且雙饋入間具有高隔離度之操作。所使用之被動切換匹配電路具有主動切換開關之功能且能降低天線複雜度，並可與天線後端電路之天線切換模組整合。接著，考慮到降低通訊裝置中天線與周邊電子元件間的影響，將被動切換匹配電路天線設計概念應用在環圈天線上，並針對其相關電路設計進行研究。再者，為了降低雙饋入電路天線中晶片元件的數目及簡化匹配電路設計，本論文更提出一種與被動切換匹配電路整合之單饋入天線設計，在具有簡單低頻支路及高頻支路的結構下，透過被動元件而使天線於低頻頻帶及高頻頻帶均產生雙共振，而得到雙寬頻之操作，涵蓋698~960及1710~2690 MHz頻帶。以上之天線設計皆具有良好之輻射特性，且體積僅需10 ∗ 30 ∗ 3 mm3。

The design concept of using the passive switchable matching circuit (PSMC) is applied to dual-feed LTE/WWAN tablet computer antennas. Firstly, by applying the PSMC, a dual-feed antenna with a simple structure can achieve a dual-wideband operation, and high isolation between the two feeds thereof can also be obtained. The PSMC can function like using an active switch, thereby decreasing the complexity of the antenna design. The PSMC can also integrate with ASM (Antenna Switch Module) to decrease the complexity of the system design. Secondly, in order to decrease the effects of surrounding components to the antenna, the PSMC design concept is applied to a loop antenna, and the related circuit design for the loop antenna is presented. Thirdly, in order to decrease the number of the lumped elements and simplify the circuit design, a single-feed antenna integrated with the PSMC is presented. With the aid of the PSMC, the antenna with simple low-band and high-band feeding branches can generate dual-resonance in both bands to achieve a dual-wideband operation for covering the LTE/WWAN bands of 698~960 and 1710~2690 MHz. All of the proposed antennas show good radiation characteristics and have a small occupied volume of 10 ∗ 30 ∗ 3 mm3 only.

文字目錄+i
圖形目錄+iii

第一章 序論 (Introduction)
1.1 研究動機+1
1.2 文獻導覽+3
1.3 論文提要+3

第二章 雙饋入倒F形電路天線設計 (Dual-Feed Inverted-F Circuit-Defined Antenna)
2.1 利用被動切換匹配電路增加頻寬及維持雙饋入高隔離度之原理+5
2.2 模擬結果與匹配電路元件分析+12
2.3 心得與討論+14

第三章 具有被動切換匹配電路之雙饋入雙寬頻環圈天線設計 (Dual-Feed Dual-Wideband Loop Antenna with Passive Switchable Matching Circuit)
3.1 天線與被動切換匹配電路設計原理介紹+16
3.2 匹配電路元件分析及討論+23
3.3 心得與討論+26

第四章 與被動切換匹配電路整合之平板電腦天線設計 (Tablet Computer Antenna with Integrated Passive Switchable Matching Circuit)
4.1 天線與匹配電路設計介紹+27
4.2 實驗結果與分析+31
4.3 心得與討論+38

第五章 結論 (Conclusions)+39

參考文獻 (References)+41

著作表 (Publication List)+44

[1] F. H. Chu and K. L. Wong, “On-board small-size printed LTE/WWAN mobile handset antenna closely integrated with nearby system ground plane," Microwave Opt. Technol. Lett., vol. 53, pp. 1336-1343, 2011.
[2] K. L. Wong and W. Y. Chen, “Small-size printed loop-type antenna integrated with two stacked coupled-fed shorted strip monopoles for eight-band LTE/GSM/UMTS operation in the mobile phone," Microwave Opt. Technol. Lett., vol. 52, pp. 1471-1476, 2010.
[3] K. L. Wong, H. J. Jiang and T. W. Weng, “Small-size planar LTE/WWAN antenna and antenna array formed by the same for tablet computer application,” Microwave Opt. Technol. Lett., vol. 55, pp. 1928-1934, 2013.
[4] K. L. Wong, M. F. Tu, C. Y. Wu and W. Y. Li, “Small-size coupled-fed printed PIFA for internal eight-band LTE/GSM/UMTS mobile phone antenna,” Microwave Opt. Technol. Lett., vol. 52, pp. 2123-2128, 2010.
[5] K. L. Wong and T. W. Weng, “Small-size triple-wideband LTE/WWAN tablet device antenna,” IEEE Antennas Wireless Propagat. Lett., vol. 12, pp. 1516-1519, 2013.
[6] K. L. Wong, Y. C. Liu and L. C. Chou, “Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit,” Microwave Opt. Technol. Lett., vol. 54, pp. 426-431, 2012.
[7] K. L. Wong and T. J. Wu, “Small planar internal WWAN tablet computer antenna,” Microwave Opt. Technol. Lett, vol. 54, pp. 305-309, 2012.
[8] K. L. Wong, W. Y. Chen, C. Y. Wu and W. Y. Li, “Small-size internal eight-band LTE/WWAN mobile phone antenna with internal distributed LC matching circuit,” Microwave Opt. Technol. Lett., vol. 52, pp. 2244-2250, 2010.
[9] K. L. Wong and M. T. Chen, “Small-size LTE/WWAN printed loop antenna with an inductively coupled branch strip for bandwidth enhancement in the tablet computer,” IEEE Trans. Antennas Propagat., vol. 61, pp. 6144-6151, 2013.
[10] Y. W. Chi and K. L. Wong, “Very-small-size printed loop antenna for GSM/DCS/PCS/UMTS operation in the mobile phone,” Microwave Opt. Technol. Lett., vol. 51, pp. 184-192, 2009.
[11] K. L. Wong, M. F. Tu, C. Y. Wu and W. Y. Li, “On-board 7-band WWAN/LTE antenna with small size and compact integration with nearby ground plane in the mobile phone,” Microwave Opt. Technol. Lett., vol. 52, pp. 2846-2853, 2010.
[12] C. H. Chang and K. L. Wong, “Small-size printed monopole with a printed distributed inductor for penta-band WWAN mobile phone application,” Microwave Opt. Technol. Lett., vol. 51, pp. 2903-2908, 2009.
[13] K. L. Wong and T. J. Wu, “Small-size LTE/WWAN coupled-fed loop antenna with band-stop matching circuit for tablet computer,” Microwave Opt. Technol. Lett., vol. 54, pp. 1189-1193, 2012.
[14] K. L. Wong and P. J. Ma, “Small-size WWAN monopole slot antenna with dual-band band-stop matching circuit for tablet computer application,” Microwave Opt. Technol. Lett., vol. 54, pp. 875-879, 2012.
[15] Y. W. Chi and K. L. Wong, “Very-small-size folded loop antenna with a band-stop matching circuit for WWAN operation in the mobile phone,” Microwave Opt. Technol. Lett., vol. 51, pp. 808-814, 2009.

[16] A. Andújar and J. Anguera, “Multiband coplanar ground plane booster antenna technology,” Electron. Lett., vol. 48, pp. 1326-1328, 2012.
[17] A. Andújar and J. Anguera, “Magnetic boosters for multiband operation,” Microwave Opt. Technol. Lett., vol. 55, pp. 65-75, 2013.
[18] R. Valkonen, A. Lehtovuori, C. Icheln, “Dual-feed, single-CCE antenna facilitating inter-band carrier aggregation in LTE-A handsets,” in the 7th European Conference on Antennas and Propagation, pp. 3954-3958, 2013.
[19] Y. T. Hsieh, K. L. Wong, Y. T. Liu and H. T. Chen, “Printed dual-feed triangular patch antenna disposed in a small notch in the handheld device system ground plane for LTE/WWAN operation,” Microwave Opt. Technol. Lett., vol. 55, pp. 2767-2773, Nov. 2013.
[20] E. Palantei, D. V. Thiel, and S. G. O’Keefe, “Rectangular Patch with Parasitic Folded Dipoles: A Reconfigurable Antenna,” Proc. iWAT, Chiba, Japan, pp. 251-254, 2008.
[21] S. H. Chen, J. S. Row and K. L. Wong, “Reconfigurable Square-Ring Patch Antenna With Pattern Diversity,” IEEE Trans. Antennas Propagat., vol. 55, pp. 472-475, 2007.
[22] Y. K. Park and Y. Sung, “A reconfigurable antenna for quadband mobile handset applications,” IEEE Trans. Antennas Propagat., vol. 60, pp. 3003-3006, 2012.
[23] http://www.ansoft.com/products/, ANSYS HFSS.