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An Ultra Wideband Hexagonal Patch Antenna with Enhanced Bandwidth

Katuru Anjaneyulu, Srinivas Raja Banda, Ravindranadh Jammalamadugu

Abstract


A microstrip line feed Ultra-Wideband (UWB - 3.1 to 10.6 GHz) hexagonal patch antenna with enhanced bandwidth was presented in this article. The enhancement of bandwidth (BW) is achieved by defecting the partial ground structure. The antenna is designed by FR-4 substrate with εr(dielectric constant) = 4.3 & Tan δ (loss tangent) = 0.025.Initially, a conventional  hexagonal patch with a partial ground plane produces a – 10 dB bandwidth of 4.7 to 19.7 GHz with a bandwidth ratio(BR) of 4.19:1.An extremely wide impedance BW(IBW) was obtained from 4.7 to 31.4 GHz due to defective ground structure (DGS) with an IBW ratio (IBWR) of 6.68:1This design increases the fractional bandwidth (FBW) from 122.9% to 147.9% i.e. 25% increase in bandwidth. The Gain (G) of the desired aerial alters from 2.24 dB to 5.97 dB. This antenna produces nearly stable omnidirectional radiation characteristics throughout its operating range. The proposed one was constructed according to plan and simulation was performed by CST (computer simulation technology).This antenna produced a large spectrum of 26.7 GHz in addition to UWB characteristics such as return loss(RL) < -10 dB (i.e.S11<-10dB), Voltage Standing Wave Ratio less than 2 (i.e.VSWR<2), omnidirectional radiation patterns and approximate constant gain.


Keywords


Ultra Wideband, Hexagonal Patch, Bandwidth, BR, IBW, DGS, FBW, Return Loss, VSWR, Omni-directional Radiation Patterns, Gain

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References


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