Vatanjeet Singh

Circular slotted THz Microstrip Patch Antenna for detection of constitutes of peptides in human body

This paper presents a novel ultra wideband circular slotted terahertz antenna design for detection of peptides in human body. In the proposed antenna design, the FR4 material has been used as a substrate having dielectric constant (εr) 4.4 and thickness of 1.5 μm. The ground, patch and feed line are made up of Copper material with thickness of 0.02 μm. The performance of terahertz antenna has been analysed in terms of bandwidth (THz), return loss (dB), directivity (dBi), gain (dB), VSWR and impedance (ohms). The designed antenna resonates at 6 THz with the bandwidth of 2375 GHz (5.423 THz 7.798 THz). The return loss of the proposed antenna is -43.58 dB at the resonating frequency of 6 THz. The VSWR of the proposed antenna design is 1. For feeding the antenna, the microstrip feed line technique has been employed for proper impedance matching and the proposed antenna has an input impedance of 48.23Ω. The proposed terahertz antenna design has a gain and directivity of 7.547 dB and 7.247 dBi, respectively at the resonating frequency of 6 THz. The antenna has been designed and simulated using Computer Simulation Technology (CST) Microwave Studio 2014. The proposed antenna can be suitably employed for the detection of constituents of peptides in human body. Keywords— CST Microwave Studio, dB, dBi, FR4, High gain, High directivity, Optical antenna, Peptides, Wide band, THz, VSWR

High gain multifaceted novel UWB flexible microstrip patch antennas for indoor location and tracking equipment applications

The motive behind this research is to analyze the performance of different microstrip patch antennas employing different shapes of substrate and ground (circular, rectangular, square, elliptical and hexagonal) using flexible substrate material for UWB wireless applications. In this paper, the multifaceted novel UWB flexible microstrip patch antennas operating over 8.2 GHz frequency for indoor location and tracking equipment such as radio frequency identification (RFID) have been proposed. The substrate employed in the proposed antennas is flexible FR-4 having dielectric constant 4.4 and thickness 1.5 mm. The main objective of using flexible FR-4 material is to make antennas robust against mechanical exposures such as twisting and bending. The antennas have rectangular shaped radiating patch with microstrip feed line mounted on the upper side of substrate for feeding power to be radiated and ground plane on the lower side of substrate. The copper material of thickness 17 microns is employed for design of radiating patch, microstrip feed line and multifaceted ground in the proposed antenna designs. The performance analysis of the proposed high gain UWB flexible microstrip patch antennas have been carried out in terms of effect of different substrate shapes on the return loss (dB), impedance bandwidth (GHz), gain (dB), directivity (dBi), VSWR and antenna impedance. It has been observed that the performance characteristics of the proposed antennas rely on the substrate and ground shapes. The antennas have been designed and simulated using CST Microwave Studio 2014. The proposed antennas have been practically fabricated and tested using E5071C network analyzer and anechoic chamber. It has been observed that experimental results closely match with simulated results.

Novel Efficient Micro strip Antenna Design for Satellite C-band Downlink Applications

* Assistant Professor, Department of Electronics and Communication Engineering, Punjabi University Patiala, India Abstract— This paper presents a novel microstrip patch antenna design for C-band satellite downlink communication applications. In the proposed antenna design, the substrate is of FR4 (Flame Retardant 4) material having dielectric constant 4.4 and the patch and ground are of copper material. The proposed antenna is resonant at 4.2 GHz and has bandwidth of 727.3 MHz (3.74 GHz 4.46 GHz) which can be used for reception of C-band satellite downlink signals at earth station. The proposed antenna has a return loss of -71 dB at resonant frequency of 4.2GHz. The antenna has a gain of 5.68 dB and directivity of 5.55 dBi at resonant frequency of 4.2GHz. The performance of the antenna has been analysed in terms of return loss (dB), directivity (dBi), gain (dB), smith chart and VSWR.

Flexible FR-4 based novel ultra-wide band microstrip patch antenna for buried landmine detection applications

The motive behind this research is to design, implement and analyze the flexible FR-4 (Flame Retardant 4) based novel wide band microstrip patch antenna operating at resonant frequency of 790 MHz for buried landmines detection applications. The proposed microstrip patch antenna has been designed using flexible FR-4 having dielectric constant (Єr) of 4.4 and thickness of 1.5mm with slotted patch on the top of substrate and a reduced ground at its lower side. The radiating patch and conducting ground are made of copper material having thickness 17 microns. The ground plane has been defected and reduced so as to escalate the antenna performance in terms of bandwidth and return loss. The feed line has to be of appropriate width so as to match the antenna impedance with port impedance of 50 ohms for maximum power transfer with minimal reflections. The performance of proposed antenna is analyzed in terms of return loss (dB), directivity (dBi), gain (dB), smith chart and VSWR. The antenna has a gain of 2.474 dB and directivity of 1.957 dBi at resonant frequency of 790 MHz. The antenna has VSWR less than 2 in the operating frequency range (761 MHz to 966 MHz). The antenna has been designed and simulated using CST Microwave Studio 2014. The antenna has been fabricated and tested for experimental validation using Network Analyzer E5071C and anechoic chamber. It has been observed that the practical results closely match with the simulated results of the antenna.

Slotted rook shaped novel wide-band microstrip patch antenna for radar altimeter, IMT, WiMAX and C-band satellite downlink applications

In this paper, a slotted rook shaped novel wide band microstrip patch antenna suitable to be employed for C-Band satellite downlink, Radio Altimeter, IMT, WiMAX applications has been proposed. The proposed antenna is resonant at 4.3 GHz with an impedance bandwidth of 1.419 GHz (3.181 GHz to 4.6 GHz) and a return loss of −53.94dB. The Teflon is used as substrate for designing the proposed antenna having dielectric constant (εr) of 2.1 with a thickness of 8mm with a radiating patch on the top of substrate and a reduced ground surface at the lower side of substrate. The ground plane has been reduced to enhance the performance in terms of bandwidth and return loss. The antenna has a gain of 3.64 dB and directivity of 3.70 dBi at frequency of 4.3 GHz. The performance of the proposed antenna has been analyzed in terms of return loss (dB), directivity (dBi), gain (dB), smith chart and VSWR. The CST Microwave Studio 2014 has been used for design antenna. The antenna has been fabricated and tested for experimental validation using Network Analyzer E5071C and anechoic chamber. It has been observed that the practical results closely match with the simulated results of the antenna.

Stacked decagon shaped THz Microstrip Patch antenna design for detection of GaAs semi-conductor properties

This paper presents a THz stacked Microstrip antenna employing substrates of material FR4 with dielectric constant of 4.4. The ground, patch and feed line are of copper material. The proposed antenna is decagonal in shape and is resonant at 8.2 THz with a return loss of −38.85dB. The bandwidth of the antenna is 360 GHz (8.058 THz – 8.418THz). The performance of optical antenna has been analyzed in terms of impedance bandwidth (THz), return loss (dB), directivity (dBi), gain (dB), VSWR and impedance (ohms). The proposed antenna design has gain and directivity of 6.48 dB and 6.33 dBi at the frequency of 8.2 THz. The proposed antenna can be used for detecting the properties of semi-conductor by employing the principle of Restrahlen effect. Measurement of the change in the amplitude and phase of THz waveforms after transmitting through a GaAs can be used to collect the information about the Semi-Conductor. A strong change in the reflectance in the optical phonon Restrahlen band of GaAs between 8 and 9 THz can be observed.

Novel dual resonant air gap antenna for defence systems, earth exploration-satellite, land mobile, radio determination application, weather satellite and broadcasting satellite applications

This paper emphasizes on the design and performance analysis of dual resonant air gap antenna design. The proposed antenna has been designed using Flame Retardant 4 (ΓΚ4) substrate of dielectric constant, εr=4.4 sandwiched between copper patch and ground plane. The design o f antenna has been made to ensure the compact size of the designed antenna and operating bandwidth of 1.007 GHz (7.281 GHz-8.288 GHz) and 560MHz (11.57 GHz-12.13 GHz). The antenna has been fe by microstrip feed line via impedance transformer to match the impedance of proposed antenna with the 50Ω impedance of coaxial connector used for feeding power to the antenna. The proposed antenna has been designed and simulated in CST Microwave Studio 2014. This antenna resonates at frequency of 7.94 GHz with the minimal return loss of −33.64 dB with an impedance bandwidth of 47.97 Ω covering the frequency range from 7.281 GHz-8.288 GHz and −30.37 dB at 11.855 GHz covering the frequency of 11.57 GHz-12.13 GHz. The antenna has gain of 6.43 dB, directivity of 7.13 dBi and percentage bandwidth of 11.92% and 4.72% at resonant frequency of 7.942 GHz and 11.855 GHz respectively. The designed antenna can be suitably employed for Defence systems (7.25 GHz–8.215 GHz), Earth exploration satellite (8.02 GHz-8.215 GHz), Land mobile (8.02 GHz-8.215 GHz), Radio determination application (7.25 GHz–8.215 GHz), Weather satellite (7.45 GHz-7.55 GHz), Broadcasting satellite (11.7 GHz-12.5 GHz) applications. The antenna has been fabricated and efficaciously tested using E5071C network analyzer and anechoic chamber. It has been perceived that the practical results closely match with the simulated results.