MUMBAI, India, June 30 -- Intellectual Property India has published a patent application (202641074483 A) filed by Ram Sandeep Duvvada on June 16, 2026, for Compact Multiband Felt-Based Textile Antenna With Meandered Slot Structure For Body-Centric Communications.
Inventors include Mulaparti Meena Kumari; D. Ram Sandeep; Palikala Chandra Venkata Sai; Gantayath Ravi Shankar; Lekkala Ushasree; Kambia Deepak Kumar; and Majji Shanmukheswara Rao.
The application for the patent was published on June 26, 2026, under issue no. 26/2026.
Abstract: This work presents a compact, wearable, felt-based textile antenna incorporating a meandered slot structure specifically engineered for body-centric wireless communication applications. The proposed antenna is realized on a jute-based felt substrate with a compact physical footprint of 30×40×1.5 mm³, with its conductive layers actualized through nano-silver conductive paste deposition. The antenna geometry was developed through a systematic four-stage iterative design process, wherein progressively nested L-shaped slots were introduced into the rectangular radiating patch, and a double-ring rectangular slot stub configuration was integrated into the partial ground plane. This distinctive ground plane modification deliberately introduces an asymmetric reactive loading beneath the radiating structure, forcing the orthogonal surface current components to acquire the necessary 90° phase offset at multiple frequencies, thereby achieving circular polarization across nine distinct operational bands spanning the 1–10 GHz frequency range. The proposed antenna operates efficiently with circular polarization features at nine frequency bands of 1.29 GHz (GPS L2), 3.72 GHz (WiMAX), 3.83 GHz (5G NR), 4.48 GHz (Weather radar systems), 5.37 GHz (ISM), 5.94 GHz (DSRC), 7.23 GHz (Military surveillance systems), 8.04 GHz (satellite communication), and 9.5 GHz (Doppler radar), making it highly versatile for next-generation multi-standard wireless communication systems. The antenna demonstrates a peak gain of 11.9 dBi and an overall radiation efficiency ranging from 85 to 95% across the operational frequency bands. To ensure suitability for body-centric wearable applications, the antenna was comprehensively evaluated under both standalone and on-body conditions at three anatomical placement locations, namely the wrist, chest, and head, with all results exhibiting strong agreement and confirming stable performance across all body-mounted deployment scenarios
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