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JCM 2025 Vol.20(3): 349-357
Doi: 10.12720/jcm.20.3.349-357

A Compact Wide-Band Array Antenna for Ka- Band Applications

Pavada Santosh1, P. Ramesh2, Chitambara Rao Karedla3,*, K. S. Chakradhar4,*, M. Lakshmunaidu5, and Harihara Santosh Dadi3
1Department of Electronics and Computer Engineering, Vignan’s Institute of Information Technology, Duvvada, Visakhapatnam, AP, India
2Department of Electronics and Communication Engineering, Sri Indu College of Engineering and Technology, Sheriguda, Hyderabad, Telangana, India
3Department of Electronics and Communication Engineering, Aditya Institute of Technology and Management, Tekkali, Srikakulam, AP, India
4Department of Electronics and Communication Engineering, Mohan Babu University, Tirupati, India
5Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, AP, India
Email: santoshpavada@vignaniit.edu.in (P.S.); drpramesh87@gmail.com (P.R.); rao.chiddubabu@gmail.com (C.R.K.); chakradharec@gmail.com (K.S.C); laxman.naidu@gmail.com (M.L.); dhhsantosh@gmail.com (H.S.D.);
*Corresponding author

Manuscript received December 29, 2024; revised February 4, 2025; accepted March 10, 2025; published June 18, 2025.

Abstract—Ka-band frequencies are used in military aircraft, space telescopes, high-resolution, close-range targeting radars, commercial wireless point-to-point microwave communication systems, systems that measure vehicle speed, and satellite communications these days. For Ka-Band applications, it is very difficult to design an antenna and also a challenging task to obtain a sufficient gain, reflection coefficient, and Voltage Standing Wave Ratio (VSWR) because Ka-Band frequencies are very large. At these frequencies, so many issues will occur, like coupling, bandwidth, and sidelobe. In this work, a new design concept of a compact, wide-band, 10-element array antenna has been proposed for Ka-band (26 GHz−40 GHz) applications based on the non-uniform structure with non-uniform spacing between the patches. The proposed antenna is implemented on a 31.3 × 10.37 × 0.787 mm³ RT duroid 5880 substrates with a relative dielectric constant of r = 2.2 and a loss tangent of 0.0009. The proposed antenna is simulated for essential parameters like reflection coefficient, Voltage Standing Wave Ratio (VSWR), and gain. Following the simulation, fabricate and measure the antenna for the same essential parameters. At the end, the simulated and measured parameters are compared for the validation of an antenna to work at Kaband frequencies. Based on the comparison, the proposed antenna yields better results, like a reflection coefficient less than –10 dB, VSWR < 2, and a peak gain of 12.2 dBi. In addition, for the proposed antenna, a wide bandwidth of 16.75 GHz is achieved in the frequency range of 22 GHz to 38.75 GHz.


Keywords—array antenna, inset feed, Ka-Band, rectangular microstrip patch antenna


Cite: Pavada Santosh, P. Ramesh, Chitambara Rao Karedla, K. S. Chakradhar, M. Lakshmunaidu, and Harihara Santosh Dadi, “A Compact Wide-Band Array Antenna for Ka-Band Applications," Journal of Communications, vol. 20, no. 3, pp. 349-357, 2025.


Copyright © 2025 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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