MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202641094127 A) filed by Geethanjali Govindarajan; Mohammed Gulam Nabi Alsath; Kirubaveni Savarimuthu; Preetha Purusothaman; and Harienthiran M on August 04, 2026, for A Flexible Frequency Selective Rasorber And A Method For Broadband Electromagnetic Wave Absorption.
Inventors include Geethanjali Govindarajan; Mohammed Gulam Nabi Alsath; Kirubaveni Savarimuthu; Preetha Purusothaman; and Harienthiran M.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The flexible Frequency Selective Rasorber (FSR) (100) intended for RADAR stealth applications is disclosed. The proposed structure comprises a resistive layer (101) embedded in an FR-4 lossy substrate (103) and a transmission layer (102) embedded in a polyimide substrate (104) separated by an air gap to realize a compact low- profile configuration. The resistive layer (101) consists of quadratic stubs (104) connected to a truncated square loop (111) and integrated with a central transmission resonator (107). A cross loop (110) and cross dipole (109) are incorporated within the resistive layer (101) to produce a transmission notch response. A minimum number of lumped resistors (112) are employed to achieve wideband absorption characteristics. The transmission layer (102) includes an etched Jerusalem cross (114) configured to realize bandpass transmission characteristics. The proposed conformal dual-layer FSR achieves absorptivity greater than or equal to 80% over the frequency ranges of 6.72-12.5 GHz and 16-19.5 GHz with fractional bandwidths of 60.2% and 19.7%, respectively. The structure further provides a transmission band from 13.5-15 GHz with a 3 dB fractional bandwidth of 10.5% and a minimum IL of 0.3 dB. The proposed rasorber exhibits a miniaturized unit-cell dimension of 0.21X0 x 0.21X0 without employing additional lumped capacitors additional lumped resistors or multiple stacked layers. The structure maintains stable absorption and transmission characteristics for incident angles ranging from 0° to 60° under both transverse electric and transverse magnetic polarizations.
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