本論文研製應用於超寬帶無線通訊3.1GHz至10.6GHz之Vivaldi天線，於天線本體加上厚膜印刷電阻，並以實際量測的方式討論不同電阻層範圍與電阻層阻值對天線性能所造成的影響。超寬帶具有低耗能與高速率等優勢，適用於微波成像或各種穿透雷達系統；而Vivaldi天線，也被稱為錐形槽天線，其體積小、結構簡單、容易於電路板上製造，並且具有極寬的頻帶，被廣泛應用於超寬帶領域中。摘要最後，以超寬帶頻域中心區7GHz為代表舉例，本論文提出之編號天線《00》，也就是未覆蓋電阻層之原型天線，其量測回波損耗為-36.9dB、天線增益為9.69dB、效率值為0.87、天線前後比為13.2dB；然而，同樣無覆蓋電阻層之對照天線[3]，其回波損耗為-17dB、增益為9.4dB、效率為0.9、天線前後比為11dB。本論文提出之電阻層覆蓋天線《02》，回波損耗為-28.9dB、增益為9.89dB、效率為0.83、前後比為13.9dB；而同樣具有電阻層覆蓋之對照天線[4]，回波損耗為-22dB、增益為7.29dB、效率為0.78、前後比為13dB。與參考文獻相互對照後，在超寬帶中頻與高頻區域內，本論文提出之電阻層覆蓋Vivaldi天線，展現良好的性能水平。

The thesis is applied to Vivaldi antennas of ultra-wideband wireless communications from 3.1GHz to 10.6GHz. A thick film printed resistor is added to the antenna surface, and effects of the different resistor layer ranges and different resistance values on antenna performance are discussed in actual measurement. Ultra-wideband has advantages of low energy consumption and high speed, and it is suitable for microwave imaging or various penetrating radar systems. The Vivaldi antenna, also known as the tapered slot antenna, is simple in structure, small in size, easy to manufacture on a circuit board, and has an extremely wide frequency band. So, it is widely used in the field of ultra-wideband. Finally, taking 7GHz of a ultra-wideband frequency point as a representative example, numbered antenna《00》proposed in this dissertation, that is, the prototype antenna without a resistor layer, has measured return loss of -36.9dB, antenna gain of 9.69dB, efficiency value of 0.87, and its antenna front-to-back ratio is 13.2dB; however, the antenna from reference [3], without covering a resistor layer as well, has return loss of -17dB, gain of 9.4dB, efficiency of 0.9, and antenna front-to-back ratio of 11dB. Resistor layer covered antenna《02》proposed in this dissertation, the return loss is -28.9dB, the gain is 9.89dB, the efficiency is 0.83, and the antenna front-to-back ratio is 13.9dB; the contrast antenna from reference [4], which also has a resistor layer coverage, has return loss of -22dB, gain of 7.29dB, efficiency of 0.78, and antenna front-to-back ratio of 13dB. After comparing with the references, in ultra-wideband intermediate frequency and high frequency regions, the Vivaldi antennas, which cover a resistor layer, proposed in this dissertation show a good performance level.

[1] New public safety applications and broadband internet access among uses envisioned by FCC authorization of ultra-wideband technology-FCC news release (February14,2002).
[2] A. Hoorfar and A. Perrotta, “An experimental study of microstrip antennas on very high permittivity ceramic substrates and very small ground planes,” IEEE Trans. Antennas Propagat., vol. 49, pp. 838–840, Apr. 2001.
[3] A. M. Abbosh, H. K. Kan, and M. E. Bialkowski1, “COMPACT ULTRA-WIDEBAND PLANAR TAPERED SLOT ANTENNA FOR USE IN A MICROWAVE IMAGING SYSTEM,” MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 48, No. 11, 2212-2216, November 2006
[4] Amin M. Abbosh and Marek E. Bialkowski, “A UWB Directional Antenna for Microwave Imaging Applications,” IEEE1-4244-0878-4/07/$20.00,5709-5712, 2007
[5] Amin M. Abbosh, “Directive Antenna for Ultrawideband Medical Imaging Systems,” Hindawi Publishing Corporation, International Journal of Antennas and Propagation, Volume 2008, Article ID 854012, 6 pages, doi:10.1155/2008/854012
[6] Constantine A. Balanis, “Antenna Theory Analysis and Design,” John Wiley & Sons, INC.1982
[7] Constantine A. Balanis, “Antenna Theory Analysis and Design,” John Wiley & Sons, INC.1997
[8] P.J. Gibson. “The Vivaldi aerial.” Proceedings of the 9th European Microwave Conference, pages 101–105, 1979.
[9] Gazit. E. “Improved Design of the Vivaldi Antenna.” Proc. IEE, 1988, 135H, pp.89-90.
[10] Oraizi, H. and S. Jam, “Optimum design of tapered slot antenna profile,” IEEE Trans. on Antennas and Propag., Vol. 51, No. 8,1987-1995, 2003.
[11] M. C. Greenberg, K. L. Virga, and C. L. Hammond, “Performance characteristics of the dual exponentially tapered slot antenna (DETSA) for wireless communications applications,” IEEE Trans. Veh. Technol, vol.52, no. 2, pp. 305–312, Mar. 2003.
[12] Mehdipour, A., K. Mohammadpour-Aghdam, and R. Faraji-Dana, “Complete dispersion analysis of Vivaldi antenna for ultra-wideband applications.” Progress in Electromagnetics Research, Vol. 77, 85-96, 2007.
[13] Yang, Y., Y. Wang, and A. E. Fathy, “Design of compact Vivaldi antenna arrays for UWB see through wall applications,” Progress in Electromagnetics Research, Vol. 82, 401-418, 2008.
[14] Vu, T. A., et al., “UWB Vivaldi antenna for impulse radio beamforming,” Proc. of the 2009 NORCHIP, 1-5, Nov. 2009.
[15] Ruvio, G., “UWB breast cancer detection with numerical phantom and Vivaldi antenna,” Proc. of the 2011 IEEE International Conference on Ultra-wideband (ICUWB), 8-11, Bologna, Italy, Sep. 2011.
[16] J.D.S. Langley, P.S. Hall and P. Newham “Novel ultrawide-bandwidth Vivaldi antenna with low crosspolarisation,” ELECTRONICS LETTERS Vol. 29 No. 23, page.2004-2005, 11th November 1993
[17] J D S Langley, P S Hall*, P Newham, “MULTI-OCTAVE PHASED ARRAY FOR CIRCUIT INTEGRATION USING BALANCED ANTIPODAL VIVALDI ANTENNA ELEMENTS,” UK, 1995.
[18] Bourqui, J., M. Okoniewski, and E. C. Fear, “Balanced antipodal Vivaldi antenna with dielectric director for near-field microwave imaging,” IEEE Trans. Antennas Propag., Vol. 58, No. 7, 2318-2326, Jul. 2010.
[19] Unknown Editor “Vivaldi Antenna,” Microwaves101.com, Summer 2019. https://www.microwaves101.com/encyclopedias/vivaldi-antenna
[20] D. Pozar, Microwave Engineering, 3rd ed., Wiley, New York, 2005.