International Journal of Scientific & Engineering Research, Volume 5, Issue 4, April-2014 1114 ISSN 2229-5518 IJSER © 2014 http://www.ijser.org Design and Simulation of Planar Inverted F Antenna for ISM Band Applications using HFSS Ashutosh Joshi 1 , Bhawana Jain 2 , Chitranshu Agrawal 3 , Anup Kotiyal 4 , Anand Singh 5 Abstract — This paper describes the design and simulation of a probe fed PLANAR INVERTED F ANTENNA (PIFA), operating at 2.4 GHz ISM band frequency; using HFSS simulator. Parameters like height of the patch from the ground, shorting plate dimensions and feed position are optimized to obtain a high gain PIFA. Bandwidth of the designed antenna is 281 MHz and gain is 3.8219 dB. Index Terms—Antenna, HFSS, ISM band, PIFA, parametric analysis, simulation, shorting plate at feed ——————————  —————————— 1 INTRODUCTION HE Planar Inverted F Antenna (PIFA) is increasingly used in the mobile market because it is a low profile antenna with omnidirectional pattern. The antenna is resonant at a quarter-wavelength (thus reducing the required space needed on the device) [1]. In general PIFA consists of a large ground plane, a top radiating patch, feed wire attached between ground plane and top radiating patch through the substrate, and a shorting wire or plate. The antenna is fed at the base of the feed wire at the point where wire connects to ground plane. In addition the shorting plate provides a good imped- ance matching with the top radiating patch. The resulting an- tenna is more compact than conventional half-wavelength probe fed patch antenna [2]-[3]. The industrial, scientific, and medical radio band (ISM band) refers to a group of bands or parts of the radio spectrum that are internationally reserved for the use of radio frequency (RF) energy intended for scientific, medical and industrial require- ments. ISM bands are generally open frequency bands, which vary according to different regions and permits. The 2.4 GHz ISM band is commonly accepted band for worldwide opera- tions [4]. The use of 2.4 GHz industrial, scientific and medical (ISM) band is becoming an important means of wireless com- munication. Wireless local area networks (WLAN), wireless internet at any access-point equipped building, Bluetooth and Zigbee wireless networks all utilize the 2.4 GHz ISM Band. Therefore, the development of appropriate antenna design is essential. For these kinds of applications the designed antenna should have a smaller size. Hence PIFA is a good option for these kinds of applications. Various parameters like dimension of the top radiating patch, feed point position, height of the radi- ating patch, shorting plate width and position, effect antenna characteristics [5]. By optimizing these parameters a PIFA is designed. Bandwidth of the designe antenna is 281 MHz and gain is 3.8219 dB. 2 DESIGN METHODOLOGY 2.1 Description of Antenna The resonant frequency is not very sensitive to the dimension of the ground plane; this could be due to the fact that the an- tenna dimension is the dominant factor for radiation [6]. As the designed antenna resonates at ISM band and is to be used in mobile devices hence it should be compact. Length and width of the ground plane are taken as Lg = 100mm and Wg = 60mm. length of the radiating patch is denoted by LP and width is WP fig (1). The patch is fed by a coax which has the resistance of 50Ω. Inner wire of the coax is extended beyond the ground through the substrate to patch. Shorting plate has width Ws . Height of the patch from the T ———————————————— • Ashutosh Joshi is currently pursuing B.Tech in ECE in DIT University, Dehradun, India, PH-9758707902. E-mail: ashi783@gmail.com • Bhawana Jain is currently pursuing B.Tech in ECE in DIT University, Dehradun, India, PH-8954238754. E-mail: bhawanajain34@gmail.com • Chitranshu Agrawal is currently pursuing B.Tech in ECE in DIT Univer- sity, Dehradun, India, PH- 9997555983. E-mail: agrawal.chitranshu@gmail.com • Anup Kotiyal is currently pursuing B.Tech in ECE in DIT University, Dehradun, India, PH-9758833960. E-mail: anupk3690@gmail.com • Anand Singh is working as the Assistant Professor in the ECE department at DIT University, Dehradun, India, PH-8979058120. E-mail: singh01anand01@gmail.com Fig (2) Fig (1) IJSER