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Chennai, India

Kulandhaisamy I.,Anna University | Shrivastav A.K.,Sameer CEM | Kanagasabai M.,Anna University | Pakkathillam J.K.,Anna University
Waves in Random and Complex Media | Year: 2015

This paper presents the design of a novel linear analog planar phase shifter deploying split-ring resonator (SRR) and complementary split-ring resonator (CSRR) structures. Based on the advantages of these structures, a triband phase shifter is designed for multiple target systems to operate at 0.85, 1.69, and 2.46 GHz bands finding applications for European RFIDs, Satellite Radio Broadcast System, Mobile Services, and ISM Band, respectively. The effect of SRR and CSRR coupling with host transmission line is also analyzed on the basis of Bloch mode theory and the modes are validated through Eigen mode analysis. The proposed phase shifter design shows a good agreement between simulated and measured results. A 90° ± 8° shift in phase is observed at lower and upper bands, and a 135° ± 8° shift is observed in center band with reasonable group delay components. © 2015 Taylor & Francis. Source

Kulandhaisamy I.,Anna University | Arun Kumar S.,Sameer CEM | Kanagasabai M.,Anna University
Waves in Random and Complex Media | Year: 2015

A novel method for achieving linear phase shift is proposed over the frequency range of 2 - 6 GHz. Dielectric characterization of FR4 substrate interfaced with air as well as water produces the phase shift. The substrate property is modified by introducing a plain rectangular packet and W-shaped packet within the FR4 substrate. The overall dimension of the proposed structure is 30 × 60 mm2. Across the entire proposed frequency range, the reflection coefficient is less than -10 dB. The proposed coplanar waveguide with water- and air-stacked FR4 substrate is simulated, fabricated, and measured for its linear phase shifting characteristics analyzed in ISM 2.45, 3.3, and 5.8 GHz bands. The analysis over the entire band depicts that the differential shift in phase is directly proportional to the effective dielectric constant of the material used. The design will be more useful in automotive anti-collision radars in military, cellular base stations, and satellite communications. © 2015 Taylor & Francis. Source

Baisakhiya S.,Sameer CEM | Sivasamy R.,Anna University | Kanagasabai M.,Anna University | Periaswamy S.,Anna University
Progress in Electromagnetics Research Letters | Year: 2013

This paper deals with a novel miniaturized FSS with wide stop band characteristics for UWB applications. The proposed FSS consists of garland like design printed on either side of the dielectric substrate. The design provides a bandwidth equal to 3.5 GHz at -20dB reference level of insertion loss which lies within the UWB range. The design delivers stable response for various angular incidences. In addition to this, the symmetrical nature of the FSS holds identical response for both TE and TM Mode of polarization. The proposed geometry is fabricated and its simulated results are validated with measurements. A comprehensive analysis is made by adjusting various parameters associated with the proposed design. Source

Sajin J.S.,Sri Venkateswara College of Engineering | Rao P.H.,Sameer CEM
2013 IEEE Applied Electromagnetics Conference, AEMC 2013 | Year: 2013

Analysis of phase characteristics of a transmission lines with capacitive stubs loaded with CSRRs of three different geometries (square, circle and triangle) in the ground plane is presented. The phase delays of -270°, -267° and -263° are observed for CSRRs of square, circular and triangular geometries respectively at resonant frequency of 1.75GHz compared with a reference transmission line (0deg) of same length. A length reduction of approximately 75% is achieved for all three CSRR loaded transmission lines when compared with a conventional transmission line. © 2013 IEEE. Source

Murugan N.A.,SRM University | Balasubramanian R.,SRM University | Patnam H.R.,Sameer CEM
Journal of Electromagnetic Waves and Applications | Year: 2016

A low-profile microstrip-fed planar monopole ultra-wideband (UWB) antenna with triple band rejection characteristics is proposed. The proposed antenna configuration consists of a bevelled ground with multiple U-slots embedded on the radiation patch for realizing the band notch characteristics. The notched frequency bands can be controlled by adjusting the parameters of the slots. The measured results demonstrate that the fabricated antenna exhibits an impedance bandwidth from 3 to 11 GHz for a VSWR ˂ 2 with three rejection bands at 3.38‒3.73 GHz for WiMAX, 5.12‒5.84 GHz for WLAN and 7.23‒8.56 GHz for X-band satellite communication services. Band rejection function is confirmed by the three gain diminishes occurring at 3.7, 5.35, and 8 GHz and stable gain outside the rejection bands. Measured group delay ensures that the designed antenna has good transmission capability of UWB signal with minimum distortion. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source

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