A Wideband Differential-Fed Microstrip Patch Antenna Based on Radiation of Three Resonant Modes

Taohua Chen,Yueyun Chen,Rongling Jian

doi:10.1155/2019/4656141

Taohua Chen, Yueyun Chen + Show 1 more

Open Access

https://doi.org/10.1155/2019/4656141

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Abstract

A wideband differential-fed microstrip patch antenna based on radiation of three resonant modes of TM12, TM30, and slot is proposed in this paper. Firstly, two symmetrical rectangular slots are cut on the radiating patch where the zero-current position of the TM30 mode excites another resonant slot mode. In addition, the slot’s length is enlarged to decrease the frequency of the slot mode with little effect on that of the TM30 mode. To further expand the impedance bandwidth, the width of patch is reduced to increase the frequency of the TM12 mode, while having little influence on that of the TM30 and slot modes. Moreover, a pair of small rectangular strips is adopted on the top of the feeding probes to achieve a good impedance matching. Finally, based on the arrangements above, a broadband microstrip patch antenna with three in-band minima is realized. The results show that the impedance bandwidth (Sdd11<−10 dB) of the proposed antenna is extended to 35.8% at the profile of 0.067 free-space wavelength. Meanwhile, the proposed antenna maintains a stable radiation pattern in the operating band.

Highlights

Microstrip patch antennas (MPAs) have been extensively investigated and developed over the past decades because of their advantages of low profile, small cost, ease of manufacture, and so on [1]
As for the second minimum at 5.75 GHz, the electric field is mainly distributed around two slots and is rarely around the radiative and nonradiative edges of the traditional microstrip antenna, which can be observed from Figure 10(b). is shows that the slot mode works at 5.75 GHz
While for the third minimum at 6.53 GHz, it can be clearly seen from the Figure 10(c) that there are three horizontal zero electric field lines, which indicates the proposed MPA resonates at the TM30 mode

Summary

Introduction

Microstrip patch antennas (MPAs) have been extensively investigated and developed over the past decades because of their advantages of low profile, small cost, ease of manufacture, and so on [1]. A novel wideband differential-fed MPA based on radiation of three resonant modes of TM12, TM30, and slot is proposed.

Results

Conclusion