Asit K. Panda

A compact triangular SRR loaded CPW line and its use in highly selective wideband bandpass filter for WiMAX communication system

In this paper we purpose a triangular split ring resonator (TSRR) loaded with co-planar waveguide (CPW) line for realizing a planar band-pass filter for miniaturization and high data rate WiMAX communication system. It consists of a 50Ω CPW line with triangular resonator etched on backside of substrate, parallel to the CPW. Because of negative permeability offered by the SRR and series capacitance this structure exhibits backward wave propagation in the vicinity of its resonant frequency. Due to the strong inductive coupling between resonator and line and periodically loading the line with narrow wires, resulting high selectivity with low insertion loss in the wide band-pass characteristic.

An Investigation of Gain Enhancement of Microstrip Antenna by Using Inhomogeneous Triangular Metamaterial

Metamaterial have been shown to enhance specific performance parameters of low profile antennas. In this paper we investigate appreciably enhancement of the gain & radiation pattern of a low profile micro strip patch antenna by placing a metamaterial slab above it (as a super strate) using CST MWS simulator. This paper proposes a metamaterial super strate surface as a reflective surface for micro strip patch antenna (MPA). The MTM structure was a combination of the triangular SRR (TSRR) and the wire strip (WS) to obtain negative values of permittivity & permeability. The gain of the MPA with MRS is around 5 dB higher than that of conventional MPA on FR4 substrate. These improvements were due to negative refraction characteristics of LHM structure that converts into super-lens, when placed in front of the antenna. The small spacing between MRS and the patch surface was another merit in the present design, which was as low as ?/10 as it results in low profile antenna design, that will suits in modern wireless communication system.

A Printed Monopole Antenna with Symmetric Meandered Arms for WLAN, WiMAX Applications

In this paper, a planar dual band symmetric Meandered Arms monopole antenna for wireless local area network (WLAN) & WiMAX applications is presented. The antenna consists of two symmetric Meandered arms radiating strip leading to generate two separate resonant modes where the first mode is for the 3.5 GHz band and the second mode is for the 5.2/5.8 GHz band operation. The purposed antenna has a measured impedance bandwidths of 3.39-3.5 GHz and 5.5-5.6 GHz, and owns good radiation characteristics impedance bandwidths, with a compact size of 30x35xl.6 mm3.The radiation pattern and resonant frequency are mainly affected by symmetric meandered arms radiating patch and a rectangular ground plane. The CST Microwave studio is employed for designing the antenna. This purposed antenna is fed by a coaxial probe through a SMA connector.

Optimization of skewed omega for left-handed material characteristics

Abstract. Artificial neural network and simulated annealing are applied to obtain optimized design parameters of skewed omega-shaped metamaterial unit cells for providing left-handed material (LHM) with a negative refractive index. The implemented numerical and experimental methods provide evidence for the validity and practicality of the technique. Simulation, with optimized parameters, using CST Microwave Studio, shows that skewed LHMs are low-loss materials.

A Compact Multiband Gasket Enable Rectangular Fractal Antenna

The design of a new fractal multi band antenna, based on Sierpinski gasket enabled rectangular geometry is presented in this paper. Two iterations of the rectangular fractal multi band antenna, with CPW feeding in 2-10 GHz band are examined. There appeared 3 resonant frequencies at 2.46 GHz, 3.7 GHz and 5.5 GHz for 2nd iteration. From the return loss plot it is seen that antenna has achieved the IEEE Bluetooth/WLAN/ISM (2.4-2.484 GHz), WiMAX (3.4-3.69 GHz) & WIFI (5.1-5.825 GHz) frequency band with-10dB return loss. Also nearly omni-directional radiation pattern is observed. The peak realized antenna gain is around 4.5 dB in each distinct band.

C-Shaped Complementing Patch Antenna for Broadband Communications

ABSTRACT Design of an optimized planar coplanar waveguide (CPW) fed complementing C-shaped patch antenna for broadband communication is presented. It resonates at 2.1 GHz with bandwidth spanning from 1.2 to 2.45 GHz for the return loss of −10 dB or more. In the absence of closed form design formulae for its resonant frequency, this paper proposes use of either artificial neural network (ANN) or simulated annealing (SA). Results from these stochastic methods are in good agreement with those from electromagnetic (EM) simulations as well as prototype measurements. The EM simulations show good radiation characteristics and moderate gain in the entire operating band of the antenna.

An Ultra-wideband Antenna with HIPERLAN/2 band rejection using CSRR structure

In this paper, a band notched ultra-wideband antenna integrated with complementary split ring resonator (CSRR) is proposed and investigated. The proposed antenna not only covers the UWB frequency spectrum but also avoids interference with HIPERLAN/2 (5.15 GHz - 5.35 GHz) by giving a notch band from 4.98 GHz to 5.37 GHz. The centre frequency of the notched band is 5.2 GHz at which the wireless LAN (HIPERLAN/2) in Europe is assigned. The notch band in the proposed paper is achieved by etching CSRR in the radiating patch. The complementary split ring resonator acts as a bandstop filter and hence enables the rejection of any undesired band within the passband of the antenna. The proposed antenna operates from 2.7 GHz to 13.7 GHz for voltage standing wave ratio (VSWR) less than 2, except the notch band of 4.98 GHz to 5.37 GHz.

Design of a planar multiband Sierpinski E-shaped carpet antenna with CPW fed for multi standard wireless terminals

In this paper Sierpinski E-Carpet antenna based on the implementation of fractal technique is proposed for multiband applications in 2-10 GHz band. There appeared 5 resonant frequencies at 2.35 GHz, 3.5 GHz, 5.503 GHz, 7.248GHz, and 8.79GHz for 2nd iteration. From the return loss plot it is seen that antenna achieved the IEEE Bluetooth/WLAN (2.4-2.484 GHz), WiMAX (3.4-3.69 GHz) and WIFI (5.1-5.825 GHz) frequency band with -10dB return loss. Also nearly omni-directional radiation pattern is observed. A prototype of the design is successfully implemented with close agreement between measurement and simulation result.

A CPW-fed printed monopole antenna using circular CSRR for WCDMA/WiMAX/WLAN applications

In this paper we purpose a novel compact size CPW-fed complementary Circular split ring resonator (CSRR) printed antenna for WLAN, WiMAX and WCDMA applications. The antenna consists of micostrip line and CSRR unit cell, with a fully covered ground plane. The simulated results show that the antenna can yield an impedance bandwidth of 1.87–2.2 GHz, 3.45–4 GHz and from 5.5–5.9 GHz band with reflection coefficient less than −10dB. The antenna has found nearly omni-directional and gain is around 3dBi for all the bands. The overall dimension of the antenna is 14 × 28mm × 1.6mm, which is suitable for all wireless applications.

A CPW Fed Complementing C-Shaped Patch Antenna for Broadband Communication

In this paper, a planar complementing C-shape patch antenna is presented. The optimal design of this antenna offers broadband operation with reasonable radiation pattern. The antenna is modeled as parallel RLC circuit. This compact antenna is realized by employing Duality concept. The antenna achieves-32 dB return loss bandwidth over 2.4 GHz to 4.22 GHz with the resonant frequency at 3.5 GHz, which covers WiMAX and WLAN applications. The CST Microwave studio is employed for designing the antenna. The antenna is fed by a 50-ohm coplanar waveguide (CPW) to make the structure purely planar. The major parameters that influence the performance of the antenna are investigated.