http://www.iaeme.com/IJARET/index.asp 604 editor@iaeme.com International Journal of Advanced Research in Engineering and Technology (IJARET) Volume 11, Issue 6, June 2020, pp. 604-613, Article ID: IJARET_11_06_055 Available online athttp://www.iaeme.com/IJARET/issues.asp?JType=IJARET&VType=11&IType=6 ISSN Print: 0976-6480 and ISSN Online: 0976-6499 DOI: 10.34218/IJARET.11.6.2020.055 © IAEME Publication Scopus Indexed DESIGN, FABRICATION AND ANALYSIS OF KEY-SHAPED MICROSTRIP PATCH ANTENNA FOR ULTRA-WIDE BAND APPLICATIONS Dhanikonda Rajeswari and N. Mary Leena Department of Electronics and Communications, D.N.R. College of Engineering and Technology, Bhimavaram, Andhra Pradesh, India. ABSTRACT This work presents the design, fabrication and analysis of microstrip patch antenna for ultra-wide band applications. The proposed key shape resembled antenna consists of two asymmetric hexagonal cuts on the ground plane. The defected ground structure and partial substrate removal techniques as well as coplanar waveguide feeding techniques are used to enhance the gain of the designed antenna. An efficient microstrip patch antenna with ultra-wide bandwidth has been proposed in this paper. The antenna dimensions are 50 x 50 x 1.6 mm 3 . The FR4 substrate material with dielectric constant of 4.4 is used for the proposed antenna. The proposed antenna is simulated using high-frequency structural simulator (HFSS) software. The initial designed antenna is found to be exhibit wide band characteristics with a gain of 6.26 dB and bandwidth of 6.48 GHz. The decreased ground area (modified design) antenna shows wide band characteristics with an enhanced gain of 6.45 dB and bandwidth of 6.83 GHz. Fabricated MPA from modified design is also wide band characteristics with a gain of 6.55 dB and band width of 7.71 GHz. These values are showing a good agreement between results of theoretical and practical. Key words: High Frequency structure simulator software; Microstrip patch Antenna; Co-planar waveguide feed technique; Defected ground structure technique; Ultra-wide band. Cite this Article: Dhanikonda Rajeswari and N. Mary Leena, Design, Fabrication and Analysis of Key-Shaped Microstrip Patch Antenna for Ultra-Wide Band Applications, International Journal of Advanced Research in Engineering and Technology, 11(6), 2020, pp. 604-613. http://www.iaeme.com/IJARET/issues.asp?JType=IJARET&VType=11&IType=6 1. INTRODUCTION In recent years, the study of microstrip patch antennas (MPAs) has made great progress due to their advantages such as low cost, low weight, low profile, planar configuration, easy for fabrication and conformability with microwave integrated circuits [1], [2]. They have been extensively used in the civilian and military applications such as bio-imaging, television,