Bandwidth Enhancement of a Compact Microstrip Patch Antenna for Different Wireless Applications

الملخص

The performance and advantages of microstrip patch antennas such as low weight, low profile, and low cost made them the perfect choice for communication engineers. Current technological trend has focused much more attention towards microstrip patch antennas, but it has little drawbacks like low gain, low efficiency, low directivity and narrow bandwidth (3-6%) of the central frequency. Its bandwidth is limited to a few percentage which is not enough for most of the wireless communication systems nowadays. One of the challenges in antenna design for modern wireless communication system is to construct a single antenna that can serve a non-contagious frequency allocation using various wireless technologies. In this paper, a wideband antenna design approach is proposed to produce a single antenna that can be used by various wireless technologies using different frequencies from 2 to 8.2 GHz, covering 2.1 GHz for 4G-LTE, WiFi frequencies at 2.4-2.5 GHz, 5-5.35 GHz and 5,7-5,8 GHz, as well as WiMax frequencies at 2.3-2.4 GHz, 2.4-2.6 GHz, 3.3-3.8 GHz, and 5.25-5.85 GHz. The antenna construction consists of a truncated patch with a coplanar waveguide (CPW)-fed line, printed on an 1.6 mm thick of FR4 dielectric substrate with permittivity εr=4.4. The simulation results of proposed antenna are based on the reflection coefficient and radiation pattern. A fractional bandwidth of 196.6% from 1.6 to 7.5 GHz and Omni- directional radiation pattern. The simulation of this antenna has been performed by using Ansoft HFSS.