Volume IV, Issue IX, September 2015 IJLTEMAS ISSN 2278 - 2540 www.ijltemas.in Page 11 Dual Band Suspended Hexagonal Patch Antenna Archana B. Naval 1 , Dr. D.K.Shedge 2 Department of Electronics Engineering, All India Shri Shivaji Memorial Society’s Institute of Information Technology, Pune, Maharashtra, India Abstract—This paper presents a suspended hexagonal Antenna. The hexagonal antenna with stub tunes for a two frequencies 1.9GHz(used in PCS mobile applications) and 2.4GHz (used in Bluetooth application ).In this paper demonstrate the suspended structure of the antenna that enhance the bandwidth of the antenna 102 MHz for PCS and 172 MHz for Bluetooth. The design of the proposed antenna is tested by experimentally. To study the effect of different height of the air gap on the performance of the antenna. Index Terms—Hexagonal patch antenna, Bandwidth enhancement, Dual band, Suspended antenna. INTRODUCTION icrostrip patch antenna used for many of the applications because of their many advantages like Light weight and low volume ,compact size, can be easily integrated with electronic circuits. Now a day’s wireless communication systems supports many applications .In one communication systems supports for many applications. So instead of using number of antennas for different applications use multiband antennas. Yazdan Khan et.al 2013[9] has discuss Bandwidth Improvement of the Rectangular Micro strip Antenna by Using Single Dipole Stub of different length that improves the Bandwidth up to 21 %. K. P. Ray et.al 2010 [10] has discuss Suspended Hexagonal Micro strip Antennas for Circular Polarization. This configuration has been realized by inserting perturbations along two opposite sides of the suspended hexagonal microstrip antenna and achieves broad bandwidth of 70 MHz. Gehan Sami [20] has been fabricated rectangular tri-band patch antenna and measured for wireless communication systems. The introduced antenna is designed for WLAN and WiMAX applications. The desired tri-band operation was obtained by proper loading for a rectangular patch antenna using slots and shorting pins. The results obtained from our simulated antenna show 5.8% impedance matching band width at 2.4 GHz, 3.7% at 3.5 GHz and 1.57% at 5.7 GHz. Deepak[21] has demonstrate the , dual band antenna for 2.4, 5.2 & 5.8 GHz ISM band applications, on a substrate of relative permittivity 4.3 used. The wide band at higher resonance is due to the modified planar dipole and the lower resonance is achieved by a stepped impedance resonator (SIR), which is electrically coupled to the modified dipole. The 2:1 VSWR impedance bandwidth of this antenna is 95MHz for the first resonance and 1.38GHz for the second resonance . M. Abou Al-Alaa [23] has fabricated compact reconfigurable multi-band monopole antenna . To achieve frequency reconfigurability, a PIN diode is used. There are two states of switch. State 1: when the switch is OFF, the antenna operates at four bands: 2.45, 3, 3.69, and 5.5 GHz with impedance bandwidth of 9.95, 5.96, 12.57, and 10.76%, respectively.In this [32] paper presents a low cost and high quality small planar antenna design for the Texas Instruments 2.4 GHz Bluetooth low energy and Proprietary System Chip application All simulation results for the antenna voltage standing wave ratio (VSWR) are verified by measurements and they are below 2 in the complete 2.4 – 2.485 GHz frequency band. This antenna used for personal mobile communication applications and Bluetooth applications. In this antenna design the separation of two bands and good impedance bandwidth and axial ratio with circular polarization using the HFSS software is take place. This paper is organized as follows section II describes the antenna design ,Section III represents the simulation results and discussion, section V conclusion. ANTENNA DESIGN The geometry of the proposed antenna is hexagonal with coaxial probe feed [8] shown in fig 1.This antenna is designed for a 2.4GHz frequency so that the resonance frequency (fo) is selected 2.4GHz putting resonance frequency in formula. 1. Calculation of the width of Patch (W)- For c=3*10^8 m/s2, f o=2.4GHz, ε r=4.4 We get W=38.22 mm 2. Calculation of effective dielectric const- For εr=4.4, h=1.6mm, W=38mm We get εreff=3.99 M