Return loss-bandwidth evaluation for electrically small microstrip antennas

Mohsen Eslami Nazari, Weimin Huang and Zahraalsadat Alavizadeh

Journal of Electromagnetic Waves and Applications, 2020, vol. 34, issue 16, 2220-2235

Abstract: A method incorporating Bode–Fano integrals is proposed in this paper to evaluate the potential bandwidth of small antennas and provide a particular strategy for bandwidth improvement. The Bode–Fano theory is applied to the equivalent circuit of small microstrip antennas to calculate the maximum achievable return loss-bandwidth. Results of applying this theory to three types of microstrip antennas in $TM_{01} $TM01 mode of propagation with defected ground structure (DGS) and defected microstrip structure (DMS) indicate that creating slots on the microstrip patch or ground structure despite their advantages can decrease the potential bandwidth of the antenna. Fano integrals reveal the invariant relation between maximum achievable return loss-bandwidth and overall volume of the antenna validated using the quality factor (Q factor) analysis.

Date: 2020
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DOI: 10.1080/09205071.2020.1809534

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