Design of Multiband Microstrip Antenna For Industrial, Scientific, and Medical Band Application

A Multiband microstrip antenna for Industrial, Scientific and Medical Band (ISM Band) application is proposed in this paper which have a working frequency at 902 - 928 MHz, 2400 - 2480 MHz and 5150 - 5350 MHz. The antenna design uses FR4 substrate with a relative dielectric constant 4.4, thickness 0.8 mm and has a simple structure with small size of 32x72 mm2. The simulation result showed impedance bandwidth with return loss less than-10 dB, band achieved covers frequency from 898 - 932 MHz (34 MHz=3.71%). The second band at 2308 - 2484 MHz (176 MHz=7.34%), and the third band at 5065 - 5372 MHz (307 MHz=5,88%). Moreover, the proposed antenna achieved gain of 1.34 dB, 3,81 dB and 4.91 dB for the frequency band 915 MHz, 2440 MHz and 5250 MHz, respectively.