Rajkumar Rajasekaran

Department of Analytics

School of Computer Science and Engineering

Vellore Campus

Usha Kiran K.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Wireless Personal Communications

A compact stub loaded hexagonal ring shape antenna using CPW feed is designed and implemented for WLAN/WiMAX/ITU application. Y-Shape stub is loaded inside hexagonal ring to achieve multiband performance with miniaturization. The proposed antenna is highly compact with (20 × 20 × 0.8) mm³ dimension. The impedance bandwidth of the antenna is 3 GHz for both the band respectively from 2.9 to 5.9 GHz and 7 to 10 GHz. The substrate material used is Flame Retardent-4 (FR-4) due to its availability and low cost of fabrication. Relative dielectric constant and substrate thickness of material is 4.4 and 0.8 mm respectively. Ansys HFSS tool is used to optimize the designed parameters and experimental validation is done by Vector Network Analyzer. © 2019 IEEE.

2019 TEQIP III Sponsored International Conference on Microwave Integrated Circuits, Photonics and Wireless Networks (IMICPW)

Stub loaded compact hexagonal ring antenna for WLAN/WiMAX/ITU applications

In this paper, a compact asymmetric coplanar strip (ACS)-fed monopole antenna is presented. The proposed antenna consists of a tapered shaped radiating element and a meta-atom (complementary split ring resonator-CSRR), loaded in the ground plane which helps in obtaining multiband characteristics with proper impedance matching performance. Antenna with dimensions of 25 × 12.2 × 1.6 mm3 has been designed, fabricated and tested. The experimental result that exhibits of −10 dB impedance bandwidth by the proposed antenna at the center frequency of 2.88 GHz (1100 MHz), 5.78 GHz (1940 MHz) and 7.64 GHz (660 MHz). It covers wireless applications namely wireless local area network (WLAN) 2.4/5.2/5.8 GHz, long-term evolution (LTE) LTE 2.5 GHz, public safety applications 4.9 GHz, worldwide interoperability for microwave access (WiMAX) 5.5 GHz, wireless access for vehicular environments (WAVE) 5.9 GHz and X-band downlink frequency band 7.5 GHz. The antenna has good radiation characteristics in both E-plane and H-plane for all the operating frequencies. The proposed antenna exhibits a better performance compared to the previously reported designs to the existing antenna designs which are discussed in the literature. Moreover, the antenna possesses compact size, the total size occupied by the design is 0.20λ0 × 0.1λ0. © 2018 Elsevier GmbH

AEU - International Journal of Electronics and Communications

A compact meta-atom loaded asymmetric coplanar strip-fed monopole antenna for multiband operation

Mobile WiMax uses Orthogonal Frequency Division Multiple Access (OFDMA) in uplink where synchronization is a complex task as each user presents a different carrier frequency offset (CFO). In the Data Aided Phase Incremental Technique (DA-PIT) estimation is performed after FFT operation to use the received frequency domain pilot subcarrier information. As estimation is done in the presence of noise, there exists some offset error, which is called residual frequency offset (RFO). The Simple Time Domain Multi User Interference Cancellation scheme (SI-MUIC) is a time domain approach which takes a longer time delay to compensate the CFO effect for the last user. Decorrelation-Successive Interference Cancellation (DC-SC) and Integrated Estimation and Compensation (IEC) are frequency domain approaches that compensate the CFO effect with a more complex method for ICI cancellation. The Modified Integrated Estimation and Compensation technique (Modified IEC) is proposed for better residual CFO compensation. The proposed technique has better performance due to its efficient suppression of ICI and MUI. The difference between the CFOs of two OFDMA symbols lies within the range of RFO that is not considered in the conventional compensation techniques, such as the SI-MUIC, DC-SC and IEC compensation techniques.

Fulltext

Journal of ICT Research and Applications

Efficient CFO Compensation Method in Uplink OFDMA for Mobile WiMax

A compact metamaterial multiband antenna for WLAN/WiMAX/ITU band applications

Microwave and Optical Technology Letters

Direct-fed reduced size patch antenna using array of cSRR in the ground plane

A compact metamaterial inspired triple band antenna for reconfigurable WLAN/WiMAX applications

Electronics Letters

Multi-band microstrip-fed slot antenna loaded with split-ring resonator

A Metamaterial Inspired Compact Open Split Ring Resonator Antenna for Multiband Operation

Journal	Data powered by TypesetWireless Personal Communications
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	0929-6212
Open Access	0