Comparative analysis of microstrip-line-fed gap-coupled and direct-coupled microstrip patch antennas for wideband applications

  • Akanksha GuptaEmail author
  • D. K. Srivastava
  • J. P. Saini
  • Ramesh Kumar Verma


An attempt is made to improve the impedance bandwidth (S11) of a microstrip antenna by means of the gap-coupling method, yielding a bandwidth of 97.88% for the gap-coupled rectangular microstrip antenna (GC-RMSA) compared with 7.67% for the direct-coupled rectangular microstrip antenna with all dimensions the same. The maximum gain of the proposed (GC-RMSA) design is 6.725 dB with antenna efficiency of 99.86%. The proposed antenna design is analyzed using the IE3D simulator. The microstrip line feed technique is used to energize the antenna, and its performance as a function of the gap between the elements (g) and the width of the feed strip (W) is investigated. The results show that the impedance bandwidth of the gap-coupled antenna depends on the coupling gap between the elements; indeed, as the gap (g) is increased up to a certain level, the bandwidth of the proposed antenna increases, resulting in a wideband characteristic. However, after a certain value of the gap (g), the bandwidth decreases due to spurious radiation, and the antenna characteristic changes from wide to dual band with a corresponding decrease in the bandwidth. The proposed antenna design covers the frequency range from 2.093 to 6.105 GHz, including the C-band, S-band uplink and downlink frequencies, Wi-Fi, Bluetooth, WLAN, and IEEE (a/b/g) standard applications.


Bandwidth Gap coupled Direct coupled IE3D Microstrip line feed WLAN 



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Authors and Affiliations

  1. 1.Institute of Engineering and TechnologyBundelkhand UniversityJhansiIndia
  2. 2.Bundelkhand Institute of Engineering and TechnologyJhansiIndia
  3. 3.Netaji Subhash University of TechnologyNew DelhiIndia

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