International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | March -2017
p-ISSN: 2395-0072
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Terahertz Microstrip Patch Antenna Design for detection of Plastic Explosive SEMTEX Payal Kalra1, Prince2, Ekambir Sidhu3 1Department
of Computer Engineering, Punjabi University, Patiala, India of Electronics and Communication Engineering, Punjabi University, Patiala, India 3Assistant Professor, Department of Electronics and Communication Engineering, Punjabi University, Patiala, India ---------------------------------------------------------------------***--------------------------------------------------------------------2Department
Abstract – Terahertz frequency regime has gained high
help of lenses and mirrors [5]. In the past few decades the development of THz sources and detectors had played a crucial role [6] in advancement of terahertz technology and for bringing it to the limelight of the technical world.
attention because of high potential for numerous number of applications. The proposed paper demonstrates the design and analysis of terahertz microstrip patch antenna for detection of plastic explosive SEMTEX by deploying Fr4 material as substrate of thickness 1.62 µm with dielectric constant of 4.4 whereas the radiating patch and ground plane are made up of copper material having high conductivity and low resistivity. The reduced ground plane has been used in order to acquire the desired resonant frequency. For the designing and analysis of the proposed antenna Computer Simulation Technology (CST) Microwave Studio 2016 has been deployed. It has been observed that the proposed antenna has an input impedance of 49.15 Ω which resonates at 4.32 THz frequency with return loss of -52.10 dB and with a gain of 5.88 dB and directivity of 5.75 dBi which makes it highly suitable for detection of plastic explosive SEMTEX.
In the past few decades an increase in research for explosive detection has taken place. Researchers are trying to develop more analytical techniques to enable faster, more sensitive and simpler determination pathways so as to trace or identify explosive substances [7]. They are detected on the bases of their spectral signature as many solid-state explosives exhibit different absorption characteristics in THz frequency. These spectral signatures are the result of intramolecular and intermolecular vibrational modes of the materials [8]. Basically we make use of THz-TDS (Terahertz time domain system) [9] and terahertz microstrip patch antenna for the various applications like standoff detection of explosives [10], medical imaging [11] etc. Terahertz time domain spectroscopy technique is way to generate and detect terahertz efficiently which emerged as the main spectroscopic modality with more compactness and stability [12] whereas Terahertz microstrip patch antennas has built up an easy pathway for detection and determination of illicit drugs, explosives etc. moreover their small size, light-weight, reliability, high-efficiency makes them suitable for employability [13]. Due to this reason in the proposed paper a Terahertz microstrip patch antenna has been designed for the detection of plastic explosive SEMTEX [14] which is considered as one of the strongest explosives in world. It is so much powerful that 250 mg of SEMTEX has capability to destroy a commercial airplane. It is easy to obtain but difficult to detect because of its stable nature [15]. It is very similar to plastic explosive named as C-4 but it is very stable at higher temperature ranges also plus it is waterproof in nature [16]. The proposed system has the capability to detect such a strong explosive at resonant frequency of 4.32 THz.
Key Words: SEMTEX, Plastic explosive, Gain, Directivity, Input impedance.
1.INTRODUCTION The part of electromagnetic spectrum present between classical microwave and the infrared region is known as terahertz frequency band (0.1THz- 10THz), it is gaining popularity and becoming technologically more pertinent due to large number of applications which can be potentially supported by it i.e. sensing, imaging, medicines etc. [1][2]. Developments are going on so as to generate and detect terahertz radiation so as to use terahertz frequency spectrum for detecting the presence of unobtrusive materials [3]. They can easily penetrate through substances like paper, plastic etc. because the terahertz radiation is transparent in many dielectrics and has low photon energy due to which terahertz radiations are mainly used for detection purposes [4]. However, they are like light waves as they can be easily manipulated with the
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