Jagtar Singh Sivia

Design of fractal based microstrip rectangular patch antenna for multiband applications

In this paper a multiband fractal based rectangular microstrip patch antenna is designed. FR4 substrate having thickness of 1.58 mm is used as substrate material for the design of proposed antenna and microstrip feed line provides the excitation to the antenna. The antenna operating frequency range is from 1 to 10 GHz. The proposed antenna resonate at twelve different frequencies as 1.86, 2.33, 3.67, 4.57, 5.08, 6.06, 7.03, 7.75, 8.08, 8.84, 9.56 and 10 GHz and the return losses are -15.39, -16.48, -10.02, -17.29, -13.15, -23.41, -10.22, -11.28, -17.02, -10.94, -15.15 and -15.48 dB respectively. The proposed antenna is designed and simulated by using the Ansoft HFSS V13 (high frequency structure simulator) software.

Design of C Shape Modified Sierpinski Carpet Fractal Antenna for wireless applications

This paper describes the design of C Shape Modified Sierpinski Carpet Fractal Antenna (MSCFA) at a frequency of 2.4 GHz that support multiband behavior. The proposed antenna operates in S-band (2-4 GHz), X-band (8-12 GHz), L-band (1-2 GHz) and C-band (4-8 GHz) applications. The proposed fractal geometry has been designed by introducing a C Shape slot in the rectangular patch. The Rogers RT/Duroid 5880 material with dielectric constant 2.2 and height 1.6 mm is used for the design of proposed antenna. The proposed antenna is fed by coaxial probe feed. The proposed antenna performance is obtained in terms of Gain, Return Loss (RL), Radiation Pattern, Voltage Standing Wave Ratio (VSWR) and Bandwidth which have acceptable values of return loss less than -10 dB, VSWR less than 2 at each resonant frequencies and Gain more than 3 dB. Return Loss and VSWR of proposed antenna are measured using VNA (Vector Network Analyzer). The measured and simulated results are compared and both are in good agreement with each other.

A novel design of wearable fractal antenna for wideband applications

Wireless mobile communication systems require increased bandwidth for data and voice applications. Wearable electronics has many applications in the field of telemedicine, sports, military and tracking systems. In this paper wideband wearable fractal antenna with line feed is designed using HFSS V13 software. Polyester material with dielectric constant 3.2 and height 1mm is used as a substrate material. The optimization technique is used at the defected ground plane for proper impedance matching to get better results such as return loss, gain etc. Proposed antenna works from 4.3GHz to 30 GHz wideband with a maximum peak gain of 6.5 dB. Proposed antenna can be used for Ultra Wide Band (UWB) and Super Wide Band (SWB) communication applications.

Design of Modified Sierpinski Gasket Fractal Antenna for C and X-band applications

This paper presents a novel design of Modified Sierpinski Gasket Fractal Antenna (MSGFA). Sierpinski Gasket is known by name of Sierpinski Triangle having triangular slots using mid-point geometry of triangle. Sierpinski Gasket Geometry is modified using circular shape. It is fabricated on a low cost FR-4 epoxy substrate with relative permittivity of 4.4 and having dimensions 17.89 × 21.45 × 1.6 mm3.The proposed antenna has return loss is -15.77 dB at 5.51GHz.Probe feed is used to feed the proposed antenna. Antenna has a gain 9.68dB at 9.65GHz. The simulation of proposed antenna is done using High Frequency Structure Simulator HFSS V13 Software.

Design of F-Shape Fractal Microstrip Patch Antenna for C- and X-Band Applications

In this paper, F-shape fractal microstrip patch antenna is designed using roger RT/duroid and FR4 glass epoxy substrate materials. Proposed antenna is fed by microstrip line feed. Simulations of proposed antenna are done up to third iteration using Ansoft HFSS software. F-shape fractal notation in antenna design makes the patch antenna flexible in terms of generating resonant frequency and bandwidth, as an iteration number of fractal increases. Performance parameters of the antenna such as bandwidth, radiation pattern, return loss, and VSWR are compared for both the substrate materials. It is found that rogers RT/duroid as a substrate provides less return loss and more gain. Vector Network Analyzer (VNA) is used for the measurement of return loss and VSWR of the antenna. Simulated and measured results show good agreement with each other. The measured results of proposed antenna with rogers RT/duroid substrate exhibit a gain of 7.2261, 5.0946, 2.9631, 8.3167, and 1.2998 dB at resonant frequencies 5.6, 7.72, 9.34, 11.26, and 13.58 GHz, respectively.

Design of Modified Plus Shape Sierpinski Carpet Fractal Antenna for S and C band applications

This paper presents the Modified Plus Shape Sierpinski Carpet Fractal Antenna (MPSSCFA) for S and C band applications. Ansoft High Frequency Structural Simulator (HFSS) software is used for simulation purpose. The FR-4 epoxy with relative permittivity 4.4 and height 1.6 mm is taken as substrate material for design of suggested antenna. This antenna is fed by 50 ohm coaxial probe feed. The suggested antenna is simulated up to 3rd iteration. The hardware implementation of MPSSCFA is also carried out. Return losses of suggested antenna are measured using Vector Network Analyzer (VNA). Experimental results show that suggested antenna works at six resonant frequencies having values (in GHz) 2.23, 4.75, 5.23, 6.61, 6.79 and 9.58 and exhibits the multiband behavior. The measured and simulated results are compared. Return Loss (RL), VSWR, gain and radiation pattern are used to evaluate performance of this antenna. All these parameters have acceptable values. A comparison of suggested antenna with similar type of antennas is also done. It is found that suggested antenna works at six frequencies with maximum gain 15.27dB where as other antennas work at the most five frequencies with maximum gain 8.95 dB. Thus suggested antenna is better than other existing antennas.

Double U slotted microstrip rectangular patch antenna for GPS applications

A double U slot microstrip rectangular patch antenna with truncated corners is demonstrated in this paper. The antenna has been designed with FR4 substrate material whose dielectric constant is 4.4 with defected ground plane using coaxial probe feed. Two U slots are cut from the patch and third U slot is cut from the ground plane to make it defective. Performance parameters like return loss (dB), VSWR, gain (dB), bandwidth (GHz) and radiation pattern of proposed antenna are improved than conventional antenna. The return loss of proposed antenna is -22.9dB at resonant frequency 1.1 GHz where as the return losses of conventional antenna -12.39dB at 1.9 GHz frequency. It is observed that resonant frequency of proposed antenna is shifted towards the lower side. By introducing two U slots in the rectangular patch, truncating the corners of patch and one U slot in the ground plane the size of proposed antenna has been reduced near about 60% as compared to conventional antenna. HFSS (high frequency structural simulator) software is used to investigate the characteristics of this antenna.

Circular-Shape Slotted Microstrip Antenna

In this paper, a novel single-feed circular-shape slotted microstrip antenna is proposed for C-band (4–8 GHz) applications. Antenna is designed on FR4 glass epoxy material with dielectric constant 4.4 and height 1.56 mm. Antenna is fed by a coaxial probe feed. Ansoft-based HFSS software is used for the simulation of proposed antenna. Vector Network Analyzer (VNA) is used for measuring the Return Loss (RL) and Voltage Standing Wave Ratio (VSWR) of the proposed antenna. The measured results such as gain, bandwidth, and return loss confirm the validity of this design and show a good agreement with simulated results. The proposed antenna shows a bandwidth of 191 MHz at 4.34 GHz, 190 MHz at 5.9 GHz and 106 MHz at 6.51 GHz frequency.

On the design defected ground plane based L slotted microstrip patch antenna for C band applications

A co-axial feed Microstrip Patch Antenna (MPA) operating at 4.6 GHz frequency, with four symmetric L shaped slots is presented in this paper. The proposed antenna is designed using Roger RT Duroid 5880 substrate material having dielectric constant 2.2 and thickness 4.0 mm. This antenna with Full Ground Plane (FGP) has return loss is -17.91dB and gain 7.9dB is achieved but by defecting the ground plane return loss and gain are further improved to -21.23dB and 8.4dB respectively. The performance parameters of antenna such as Voltage Standing Wave Ratio (VSWR), Return Loss (RL), gain and radiation pattern are simulated using Ansoft High Frequency Structure Simulator (HFSS) software. The performance parameters of conventional antenna, proposed antenna with full and Defected Ground Planes (DGPs) are compared in this paper. It is found that defected ground plane antenna has better results than conventional and the antenna with full ground plane.