www.tjprc.org editor@tjprc.org NOVEL STACKED ARRAY ANTENNA FOR THZ APPLICATION BAND SHAMALA RAJARAM MAHADIK 1 & BOMBALE UTTAM LAXMAN 2 1 Associate Professor, Department of Electronics & Telecommunication, Dr J.J. Magdum College of Engg., Jaysingpur, India 2 Professor, M Tech. Electronics Department, Department of Technology, Shivaji University Kolhapur, India ABSTRACT Nowadays, wireless space communication demands high data rate for communication. The improvement in the bandwidth gives high data rate. THz spectrum is the frequency range of 300GHz to 30THz, in this spectrum the problems of spectrum scarcity and limited bandwidth can be solved. As the Terahertz waves are atmosphere free, hence are good for space communication. With this high gain terahertz antenna it is possible to reduce free space path loss. This proposed work presents a novel, stacked 24-elements array of antenna at 515GHz for Terahertz application band. The antenna is designed on a thin substrate having lower substrate height is 0.2mm with slotted rectangular antenna having conical vias from this layer to ground. While the stacked antenna having substrate height of 0.2mm above the lower layer; with dielectric constant of Ɛr = 3.8. This Terahertz antenna design provides a 11.5 dBi gain and 12.6 dBi directivity . The proposed antenna consists of 24 elements, where these are connected 4 X 6 excites with coplanar waveguide (CPW) feed. This feeding technique gives a good impedance matching at inputs of the radiating elements. The antenna presents a wide bandwidth of 34 GHz and satisfies all performance parameters. It has return loss of -22.5 dB at the resonance frequency of 515GHz (S11< -10dB). The antenna is low cost, less weight and low profile with radiation efficiency of 100%. The antenna is designed, analyzed and optimized on IE3D Zeland software version 15.30 KEYWORDS: THz Spectrum, Wireless Space Communication, Array Antenna, Wide Bandwidth & Unallocated Spectrum Received: Jan 27, 2019; Accepted: Feb 17, 2019; Published: Mar 15, 2019; Paper Id.: IJECIERDJUN20192 INTRODUCTION The range of frequency from 300 GHz to 30THz in the electromagnetic spectrum which is in between microwave and infrared band is terahertz(THz)spectrum [1][2]. With naked eye, terahertz radiations are not visible to us. If we compare THz radiations and X-rays then THz are more safety, non-destructive and non-invasive can be seen through dust; clouds etc. [3] so it is a good candidature in adverse weather conditions. THz waves reduces the interference problem, minimizes spectrum scarcity and bandwidth problems in space communication. THz waves are highly directional so provides more secure communication than that of microwaves communication [4] [5]. The size and weight of space vehicles and hence their operational cost can be reduced by use of small size THz antennas in wireless communication. Terahertz spectroscopy has various applications such as identifying tablet coating defects, spectroscopy (chemistry, astronomy), product inspection (industry), weapons concealed under clothing (airports), material characterization (physics), detection of cancer and caries. In the pharmaceutical industries it enables nondestructive, internal, chemical analysis of tablets, capsules and other dosage forms. For space craft interior and for inter orbital data transfer, terahertz wireless communication is more preferable. Original Article International Journal of Electronics, Communication & Instrumentation Engineering Research and Development (IJECIERD) ISSN (P): 2249-684X; ISSN (E): 2249-7951 Vol. 9, Issue 1, Jun 2019, 7-16 © TJPRC Pvt. Ltd.