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A Broadband Impedance-Matching Method for Microstrip Patch Antennas Based on the Bode-Fano Theory

  • Christopher M. A. Bonenberger EMAIL logo and Klaus W. Kark
Published/Copyright: May 23, 2018
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Abstract

Considering the narrow bandwidth of microstrip antennas, but also their applicability in upcoming technologies, this paper addresses the problem of wide-band matching, the theoretical bounds on the matching bandwidth and low-cost and low-complexity matching strategies. In this context the Bode-Fano bounds of single mode, linearly polarized aperture-coupled microstrip antennas is evaluated, optimized and compared to the theoretical bounds on matching bandwidth of other common feeding technologies. A detailed study of the input impedance of aperture-coupled patch antennas shows how to widen the Fano bounds. Based on this, a straight-forward and effective method to optimize the Fano bound is given. After optimization of the antennas input impedance, basic matching techniques can be applied, to exploit the enlarged bandwidth potential. As an example a λ/4-transformer as matching element is proposed. Design equations and simulation and measurement results of X-band prototypes are given as verification.

References

[1] R. M. Fano, Theoretical Limitations on the Broadband Matching of Arbitrary Impedances. Departement of Electrical Engineering, Massachusetts Institute of Technology, Cambridge, Mass., USA, 1948.Search in Google Scholar

[2] H. A. Wheeler, “Wideband impedance matching,” Wheeler Labs Rep. 418, 1950.Search in Google Scholar

[3] H. F. Pues and A. R. Van De Capelle, “An impedance matching technique for increasing the bandwidth of microstrip antennas. IEEE Trans. Antennas Propag, vol. 37, pp. 1345–1354, 1989.10.1109/8.43553Search in Google Scholar

[4] G. Matthaei, L. Young, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks, and Coupling Structures. Artech House, Norwood, Massachusetts, USA, 1980.Search in Google Scholar

[5] D. A. Paschen, Broadband Microstrip Matching Techniques. Defense Technical Information Center, Boulder, Colorado, USA, 1984.Search in Google Scholar

[6] S. D. Targonski, R. B. Waterhouse, and D. M. Pozar, “Design of wide-band aperture-stacked patch microstrip antennas,” IEEE Trans. Antennas Propag, vol. 46, pp. 1245–1251, 1998.10.1109/8.719966Search in Google Scholar

[7] S. Sevskiy and W. Wiesbeck, Air-Filled Stacked-Patch Antenna. ITG Fachbericht, Karlsruhe, Germany, 2003.Search in Google Scholar

[8] N.-W. Liu, L. Zhu, and W.-W. Choi, “A differential-fed microstrip patch antenna with bandwidth enhancement under operation of TM10 and TM30 modes,” IEEE Trans. Antennas Propag, vol. 65, pp. 1607–1614,2017.10.1109/TAP.2017.2670329Search in Google Scholar

[9] N.-W. Liu, L. Zhu, and W.-W. Choi, “Wideband shorted patch antenna under radiation of dual-resonant modes,” IEEE Trans. Antennas Propag, vol. 65, pp. 2789–2796, 2017.10.1109/TAP.2017.2688802Search in Google Scholar

[10] J. C. Allen, “Fano bounds for compact antennas,” Tech. Rep. US Navy SSC, 2007.Search in Google Scholar

[11] D. M. Pozar, Microwave Engineering. John Wiley & Sons, New York, USA, 2012.Search in Google Scholar

[12] A. Ghorbani, R. A. Abd-Alhameed, N. J. McEwan, and D. Zhou, “An approach for calculating the limiting bandwidth-reflection coefficient product for microstrip patch antennas,” IEEE Trans. Antennas and Propag, vol. 54, pp. 1328–1331, 2006.10.1109/TAP.2006.872641Search in Google Scholar

[13] M. Ansarizadeh, A. Ghorbani, and R. A. Abd-Alhameed, “An approach to equivalent circuit modelling of rectangular microstrip antennas,” Prog. Electromagn. Res. B, vol. 8, pp. 77–86, 2008.10.2528/PIERB08050403Search in Google Scholar

[14] H. W. Bode. Network Analysis and Feedback Amplifier Design. Van Nostrand, New York, USA, 1945.Search in Google Scholar

[15] G. C. Goodwin, S. F. Graebe, and M. E. Salgado, Control System Design. Englewood Cliffs, New Jersey, USA, Addison Wesley, 2000.Search in Google Scholar

[16] J. C. Allen, “Best Wideband Impedance Matching Bounds for Lossless 2-Ports,” Tech. Rep. US Navy SSC, 2001.10.21236/ADA390231Search in Google Scholar

[17] A. Ghorbani, M. Ansarizadeh, and R. A. Abd-alhameed, “Bandwidth limitations on linearly polarized microstrip antennas,” IEEE Trans. Antennas Propag, vol. 58, pp. 250–257, 2010.10.1109/TAP.2009.2037768Search in Google Scholar

[18] A. R. Lopez, “Review of narrowband impedance-matching limitations,” IEEE Antennas Propag. Mag, 2004.10.1109/MAP.2004.1374015Search in Google Scholar

[19] A. R. Lopez, “Impedance matching equation: developed using wheeler’s methodology,” IEEE Long Island Sect. Antennas Propag. Propag. Soc, vol. 46, pp. 88–90, 2013.10.1109/APS.2012.6349118Search in Google Scholar

[20] M. Gustafsson and S. Nordebo, “Bandwidth, Q factor, and resonance models of antennas,” Prog. Electromagn. Res, vol. 62, pp. 1–20, 2006.10.2528/PIER06033003Search in Google Scholar

[21] C. Balanis. Antenna Theory. John Wiley & Sons, Hoboken, New Jersey, USA, 2005.Search in Google Scholar

[22] R. Garg, P. Bhartia, and I. Bahl, Microstrip Antenna Design Handbook. Artech House, Norwood, Massachusetts, USA, 2000.Search in Google Scholar

[23] K. W. Kark, Antennen und Strahlungsfelder. Springer Verlag, Wiesbaden, Germany, 2017.10.1007/978-3-658-13965-0Search in Google Scholar

[24] D. M. Pozar, “Microstrip antenna aperture-coupled to a microstripline,” Electron. Lett., vol. 21, pp. 49–50, 1985.10.1049/el:19850034Search in Google Scholar

[25] P. L. Sullivan and D. H. Schaubert, “Analysis of an aperture coupled microstrip antenna,” IEEE Trans. Antennas Propag, vol. 34, pp. 977–984, 1986.10.1109/TAP.1986.1143929Search in Google Scholar

[26] M. Himdi, J. P. Daniel, and C. Terret, “Transmission line analysis of aperture-coupled microstrip antenna,” IEEE Trans. Antennas Propag, vol. 25, pp. 1229–1230, 1989.10.1049/el:19890824Search in Google Scholar

[27] A. R. Lopez, “Wheeler and fano impedance matching,” IEEE Antennas Propag. Mag, vol. 49, pp. 116–119, 2007.10.1109/MAP.2007.4385605Search in Google Scholar

Received: 2018-01-26
Published Online: 2018-05-23
Published in Print: 2018-06-26

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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