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Slotted patch and ground for reducing side lobe level of planar antenna operating under higher order mode

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Abstract

In this article, a novel technique based on the combined utilization of slots in patch and ground plane is proposed to reduce the side lobe level (SLL) in the E-plane of a square patch antenna operating at TM03 mode. The concept of beam reshaping through surface current reorientation is explained in detail by an analytical model and the same is validated through simulated as well as measured results. The combination of a complementary split-ring resonator (CSRR)–shaped slot, two plus-shaped slots on the patch and a plus-shaped defected ground structure (DGS), reduces the SLL by 14.7 dB and increases the half-power beamwidth (HPBW) and first null beamwidth (FNBW) by 21° and 42°, respectively, in comparison to the conventional square patch antenna. Starting from the basic expression of the E-plane radiation pattern of a square patch, an analytical model is invoked to modify this basic expression as per the structural modification to get the final expression for the proposed antenna structure. The physical insight for the stepwise modifications of the antenna structure is properly explained and justified. Analytical and simulated predictions are experimentally verified using a prototype. The simulated and measured results show a good agreement.

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Acknowledgements

The authors would like to acknowledge Dr. Satyajit Chakrabarti, Society for Applied Microwave Electronics Engineering & Research (SAMEER), Kolkata, India, for providing their measurement facilities.

Funding

This work is financially supported by Ministry of Electronics and Information Technology (MeitY), Govt. of India under Visvesvaraya Young Faculty Fellowship Visvesvaraya Ph.D. scheme (Grant No. Ph.D.-MLA-4(29)/ 2015–16).

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Correspondence to Juin Acharjee.

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Acharjee, J., Mandal, K. & Mandal, S.K. Slotted patch and ground for reducing side lobe level of planar antenna operating under higher order mode. Ann. Telecommun. 77, 825–834 (2022). https://doi.org/10.1007/s12243-022-00911-0

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  • DOI: https://doi.org/10.1007/s12243-022-00911-0

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