volume | PIER Journals

Abstract

In this paper, the gain flattening of a wideband Fabry-Perot cavity (FPC) antenna, using truncated partially reflecting surface (PRS) and slotted elliptical and rectangular shape artificial magnetic conductor (AMC) layers is proposed. FPC is fed using a metal plated microstrip antenna (MSA) which comprises three layers-elliptical slotted rectangular AMC-I layer, truncated PRS layer, and rectangular slotted elliptical AMC-II layer. AMC-II layer is designed complementary to AMC-I layer to obtain gain variation < 1dB over wide frequency band. Elliptical shaped AMC-II and truncated PRS reduce the reflected fields towards ground and thus improve front to back lobe ratio (F/B) and side lobe level (SLL). These layers resonate at higher frequency and thus reduce gain variation and couple electromagnetically with MSA and AMC-I layer to provide wide bandwidth (BW). The proposed antenna provides S₁₁ < -10 dB, 17.2 dBi peak gain with gain variation < 1.2 dB over 5.7-6.4 GHz frequency band, which covers 5.725-5.875 GHz ISM and 5.9-6.4 GHz satellite uplink C band. Broadside radiation patterns have SLL < -19 dB, cross polarization (CPL) < -17 dB, and F/B > 20 dB with wide 3 dB gain BW of 15.2%. The overall antenna dimensions are 2.3λ₀x2.75λ₀x0.5λ₀, where λ₀ is the free space wavelength corresponding to 5.8 GHz, central frequency of ISM frequency band. The measured results of the prototype fabricated structure agree with simulation ones.

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Ms. Nayana Chaskar

Prof. Shishir Digamber Jagtap

Dr. Rajashree Thakare

Dr. Rajiv Kumar Gupta