Design of FSS-Based Gain-Enhanced Wideband Srichakra-Shaped Antenna for Point-to-Point Microwave Data Links
| Authors | Ghali Srinivasa Rao1, B.T.P. Madhav1 , Y. Usha Devi1, Geetha Reddy Yenna2, K Jyostna3, Lokesh Raju V4 |
| Affiliations |
1ALRC Research Centre, Department of ECE, Koneru Lakshmaiah Education Foundation, Guntur, 522302 Andhra Pradesh, India 2Malla Reddy Engineering College for Women (MRECW), Hyderabad, India 3Department of ECE, VNR VJIET, Hyderabad, India 4Department of ECE, Adithya Institute of Technology and Management (AITM), Tekkali, AP, India |
| Е-mail | srinivas.bharadwaja@gmail.com |
| Issue | Volume 18, Year 2026, Number 4 |
| Dates | Received 28 March 2026; revised manuscript received 16 August 2026; published online 21 August 2026 |
| Citation | Ghali Srinivasa Rao, B.T.P. Madhav, et al., J. Nano- Electron. Phys. 18 No 4, 04014 (2026) |
| DOI | https://doi.org/10.21272/jnep.18(4).04014 |
| PACS Number(s) | 84.40.Ba |
| Keywords | FSS (Frequency selective surface), Gain enhancement, Microwave data-link communication, Point-to-point communication, Wideband antenna. |
| Annotation |
A compact Srichakra-inspired planar antenna combined with a frequency-selective surface (FSS) is implemented for wideband point-to-point microwave data-link applications. The proposed antenna employs a Rogers RO4350B dielectric occupying a compact volume of 46 x 51.5 x 0.3 mm3. To enhance forward radiation, a fractal-inspired spiral resonator FSS is employed as a passive superstrate. The FSS unit cell is formed by a 12 x 12 mm2 periodicity and is implemented on a 0.4 mm RO4350B substrate. A 6 x 6 FSS array is formed, resulting in an overall dimension of 78 x 78 mm2. This arrangement functions as a compact broadband partially reflective surface. The FSS redirects backward radiation toward the forward half-space through constructive field interaction. As a result, a stable gain enhancement is achieved over a wide operating frequency range. The realised gain increases from 6.9 dBi without FSS to a peak value of 11.2 dBi with FSS. This corresponds to a maximum gain improvement of about 3 dB. The antenna preserves stable impedance matching & radiation behavior after FSS integration. Consistently high gain is observed across the 5-20 GHz band. The use of low-loss materials and a passive enhancement mechanism ensure high radiation efficiency. Overall, the developed antenna offers a compact, wideband, and high-gain design suitable for point-to-point microwave data-link communication systems. |
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