由於無線通訊產業的快速發展，各種行動裝置平台皆有不同的天線需求。以筆記型電腦為例，採用金屬機殼，或是窄邊框等輕薄短小的外型設計都是現今的發展趨勢，令天線設計的挑戰越來越艱鉅，對天線擺放的空間與位置要求也越嚴苛。
本論文第一部分提出一款應用在二合一翻轉式觸控筆電轉軸內部且操作在無線區域網路頻段的雙頻段天線。其架構採用單極型式。天線本身為平面式，可適應轉軸區域的擺放空間。天線採用0.8 mm厚的FR4板印刷製作。該設計在筆電模式與平板模式下都具有一定的輻射效率，為一款可實際應用於筆電轉軸區域的WLAN雙頻天線。
第二部分提出放置於筆電基座上的多天線系統，總共提出四支天線設計，第一支的頻段為LTE行動通訊全頻段，該天線採用耦合饋入之IFA架構，尺寸為75 × 10 × 3.3 mm3；第二支的頻段為LTE中高頻，採用耦合型式單極天線，架構為平面型式；第三支的頻段為Sub-6GHz/LAA的工作頻段，也採用耦合型式單極天線；第四支天線則是結合第二與第三支天線的技術特徵，涵蓋了LTE中高頻與Sub-6 GHz/LAA多個頻段。經實作與測量驗證，每支天線之反射係數均能達到-6 dB以下的標準，各天線輻射效率皆可達到40%以上的表現，符合應用於筆電基座的需求。

Due to the rapid development of the wireless communication technology, various antenna needs are emerging for mobile platforms. For Example, adaptation of metal case. The use of narrow bezel makes antenna designs on notebooks and tablets more difficult than ever. The requirements for antenna displacement space and position are becoming more demanding.
The first part of this thesis proposes a dual-band WLAN antenna design that can be placed inside the hinge area of a 2-in-1 convertible-type notebook. Its architecture is based on the monopole configuration. This low-profile antenna is small enough to be placed within the hinge region. The radiator is printed on a 0.8 mm thick FR4 board. Sufficient radiation efficiencies are observed in both notebook and tablet modes.
The second part proposes a multi-antenna system placed on the base of the notebook. A total of four designs are proposed. The operation bands of the first antenna comply with the LTE bands of mobile communication. The antenna adopts a coupled-fed IFA configuration with sizes of 75 × 10 × 3.3 mm3; The second antenna operates in medium and high LTE bands. The antenna type is monopole and the excitation is made via a coupled-fed structure; The third antenna works is the sub-6 GHz and LAA frequency bands. It employs the monopole antenna structure with a parasitic element. The fourth antenna combines the structures of the second and third antennas and covers the LTE mid/high band/Sub-6 GHz/LAA bands. The design performance has been verified with measured results. The reflection coefficient of each antenna meet the -6 dB standard, and radiation efficiencies of applicable bands are higher than 40%, which satisfies the notebook communication needs.

[1] F. Hillebrand, "The creation of standards for global mobile communication: GSM and UMTS standardization from 1982 to 2000," IEEE Wireless Communications, vol. 20, no. 5, pp. 24-33, October 2013.
[2] L. He and C. Zhao, "4G technology promote mobile learning for new development," 2008 International Symposium on Knowledge Acquisition and Modeling, Wuhan, pp. 486-490, 2008.
[3] J. Kim and I. Lee, "802.11 WLAN: history and new enabling MIMO techniques for next generation standards," IEEE Communications Magazine, vol. 53, no. 3, pp. 134-140, March 2015.
[4] C. Sim, C. Chen, X. Y. Zhang, Y. Lee, and C. Chiang, "Very small-size uniplanar printed monopole antenna for dual-band WLAN laptop computer applications," IEEE Transactions on Antennas and Propagation, vol. 65, no. 6, pp. 2916-2922, June 2017.
[5] J. Li, D. Wu, and Y. Wu, "A compact multi-band inverted-F antenna for laptop operations," 2013 5th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, Chengdu, pp. 432-437, 2013.
[6] Z.-W. Hu, C.-H. Wei, D.-F. Mo, and Y.-Y. Chang, “Coupled-fed antenna design integrated with the hinge of notebook,” IEEE 5th Asia-Pacific Conference on Antennas and Propagation (APCAP), pp. 231-232, 2016.
[7] S. Chang and W.-J. Liao, “A compact 3D antenna with comprehensive LTE band coverage for use on notebook hinge,” in Proc. IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP), 2012.
[8] L. Chen and K. Wong, “2.4/5.2/5.8 GHz WLAN antenna for the ultrabook computer with metal housing,” in Proc. Asia Pacific Microwave Conference (APMC). 2012.
[9] S.-C. Chen, C.-W. Liou, C.-I G. Hsu, and J.-Y. Sze, “An eight-band WWAN/LTE by-hinge printed inverted-F antenna on laptop computer,” in Proc. International Symposium on Antennas and Propagation (ISAP), 2018.
[10] W. Li, W. Chen, and C. Wu, "Multiband 4-port MIMO antenna system for LTE700/2300/2500 operation in the laptop computer," 2012 Asia Pacific Microwave Conference Proceedings, Kaohsiung, pp. 1163-1165, 2012.
[11] J. R. Panda and R. S. Kshetrimayum, "A printed 2.4 GHz/5.8 GHz dual-band monopole antenna for WLAN and RFID applications with a protruding stub in the ground plane," 2011 National Conference on Communications (NCC), Bangalore, pp. 1-5, 2011.
[12] X. Chen, J. Liang, P. Li, L. Guo, C. C. Chiau, and C. G. Parini, "Planar UWB monopole antennas," in Proc. of 2005 Asia-Pacific Microwave Conference, Suzhou, pp. 4-7, 2005
[13] H.-D. Chen and H.-T. Chen, "A CPW-fed dual-frequency monopole antenna," IEEE Transactions on Antennas and Propagation, vol. 52, no. 4, pp. 978-982, April 2004.
[14] V. Trainotti and W.-G. Fano, "Slanted wire fed grounded monopole characteristics," IEEE Transactions on Broadcasting, vol. 61, no. 4, pp. 685-697, December 2015.
[15] L. Chen and K. Wong, "2.4/5.2/5.8 GHz WLAN antenna for the ultrabook computer with metal housing," in Proc. of 2012 Asia Pacific Microwave Conference, Kaohsiung, pp. 322-324, 2012.
[16] G. Bauch and A. Alexiou, “MIMO technologies for the wireless future,” in Proc. IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC 2008), Cannes, pp. 1-6, 2008.
[17] W. Anyi and L. Zhaoyang, "The study and analysis of MIMO technology based on LTE physical layer," 2010 The 2nd Conference on Environmental Science and Information Application Technology, Wuhan, pp. 306-308, 2010.
[18] H. Hu, H. Gao, Z. Li, and Y. Zhu, "A Sub 6 GHz massive MIMO system for 5G new radio," 2017 IEEE 85th Vehicular Technology Conference (VTC Spring), Sydney, NSW, pp. 1-5, 2017.
[19] J. Tan, S. Xiao, S. Han, Y. Liang, and V. C. M. Leung, "QoS-Aware user association and resource allocation in LAA-LTE/WiFi coexistence systems," IEEE Transactions on Wireless Communications, vol. 18, no. 4, pp. 2415-2430, April 2019.
[20] C. Hu, D. Huang, H. Kuo, C. Yang, C. Liao, and S. Lin, "Compact multibranch inverted-F antenna to be embedded in a laptop computer for LTE/WWAN/IMT-E applications," IEEE Antennas and Wireless Propagation Letters, vol. 9, pp. 838-841, 2010.
[21] W. C. Choi, S. Lim, Y. J. Yoon, and K. S. Ryu, "Compact inverted-F antenna using coupled-feeding structure for penta-band mobile application," 2015 International Workshop on Antenna Technology (iWAT), Seoul, pp. 137-139, 2015.
[22] S. Chen and Y. Tsou, "LTE/WWAN monopole antenna for laptop computer applications," 2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES), Honolulu, HI, pp. 1-2, 2016.
[23] T. Kang, K. Wong, and L. Chou, "Study of coupled-fed shorted monopole with a radiating feed structure for LTE/WWAN laptop computer applications," 2010 Asia-Pacific Microwave Conference, Yokohama, pp. 1785-1788, 2010.
[24] S. Chen, J. Sze, H. Jian, and W. Cai, "Loop antenna for the LTE/WWAN metal-casing laptop computer," 2017 IEEE International Conference on Computational Electromagnetics (ICCEM), Kumamoto, pp. 150-152, 2017.
[25] K. Wong and T. Kang, "Internal planar loop/monopole combo antenna for eight-band LTE/GSM/UMTS operation in the laptop computer," in Proc. of the Fourth European Conference on Antennas and Propagation, Barcelona, pp. 1-4, 2010.
[26] A. I. Abbosh, H. Al-Rizzo, S. Abushamleh, A. Bihnam, and H. R. Khaleel, "Flexible CPW-IFA antenna array with reduced mutual coupling," 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), Memphis, TN, pp. 1716-1717, 2014.
[27] D. M. El-sheakh and A. M. E. Safwat, "Multi-band CPW-fed printed IFA," in Proc. of the 2012 IEEE International Symposium on Antennas and Propagation, Chicago, IL, pp. 1-2, 2012.
[28] J. Du and C. Robiin, "An UWB coplanar waveguide fed integrated IFA design for wearable communications," 12th European Conference on Antennas and Propagation (EuCAP 2018), London, pp. 1-5, 2018.
[29] A. R. Razali, M. E. Bialkowski, and F. E. Tsai, "Multi-band planar inverted-F antenna with microstripline coupling to open-end ground slots," 2009 Asia Pacific Microwave Conference, Singapore, pp. 2471-2474, 2009.
[30] T. Kang, K. Wong, L. Chou, and M. Hsu, "Coupled-fed shorted monopole with a radiating feed structure for eight-band LTE/WWAN operation in the laptop computer," IEEE Transactions on Antennas and Propagation, vol. 59, no. 2, pp. 674-679, February 2011
[31] X. Zhu and Y. Sun, "A new coupled-loop antenna for eight-band LTE/WWAN operation in ultra-thin laptop computer," Progress In Electromagnetics Research C, vol. 42, pp. 229-238, 2013.
[32] C. Tsai and K. Wong, "Combined-type dual-wideband and triple-wideband LTE antennas for the tablet device," 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP), Kuta, pp. 411-412, 2015.
[33] Q. Li et al., "A triple-band planar monopole antenna for GPS/LTE/WLAN/Wi-Fi/WiMAX systems," 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, San Diego, CA, pp. 2535-2534, 2017.
[34] S. Hastürkoğlu and S. Lindenmeier, "A wideband automotive antenna for actual and future mobile communication 5G/LTE/WLAN with low profile," 2017 11th European Conference on Antennas and Propagation (EUCAP), Paris, pp. 602-605, 2017.
[35] W. Chen and M. Liang, "LTE/5G C-band MIMO antennas for laptop computers," 2018 International Symposium on Antennas and Propagation (ISAP), Busan, Korea (South), pp. 1-2, 2018.