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DGS Loaded Broadband Circular Patch Antenna for Satellite Communications

Nelapati Ananda Rao1, V. V. Satyanarayana Tallapragada2, D. Venkat Reddy3, and K. L. Narasihimha Prasad4
1. Department of Electronics and Communication Engineering, Vignan’s Foundation for Science Technology and Research, Andhra Pradesh, India
2. Department of ECE, Sree Vidyanikethan Engineering College, Tirupati, India
3. Department of ECE, Mahatma Gandhi Institute of Technology, Gandipet, Hyderabad, India
4. Department of ECE, Mallareddy College of Engineering and Technology, Hyderabad, India

Abstract—Broadband slotted circular patch antenna with Defective Ground Structure intended for Ku band satellite communications is presented in this communication. The proposed antenna has a fundamental circular radiating element in which a square ring slot is etched along with a circular slot inside it. The ground is etched with a rhombus ring slot at the center and square slots in the corners. The defective ground provides multiple frequencies of operation and the slots in the radiating element act as filters combining the multiple frequencies of operation into broadband. The antenna is fabricated on an FR4 substrate with a volume of 40mm×48mm×1.59mm and a dielectric constant of 4.4. The antenna has been excited using a stripline feed of 50Ω impedance. The proposed antenna has an impedance bandwidth of 1.87GHz ranging from 13.61GHz to 15.48GHz with gain and directivity of 2.2dB and 6.09dB at 13.84GHz, 2.8dB and 5.47dB at 14.48GHz, respectively. The simulated and measured antenna results are in good agreement, showing that the proposed techniques enhance the antenna bandwidth.
Index Terms—Broadband, Circular patch antenna, bandwidth, DGS, Slotted Patch, Satellite Communication

Cite: Nelapati Ananda Rao, V. V. Satyanarayana Tallapragada, D. Venkat Reddy, and K. L. Narasihimha Prasad, "DGS Loaded Broadband Circular Patch Antenna for Satellite Communications," Journal of Communications vol. 16, no. 11, pp. 485-491, November 2021. Doi: 10.12720/jcm.16.11.485-491

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