Microstrip Patch Antennas for Uwb Applications: A Review

The need for development of microstrip patch antennas for ultra-wideband (UWB) communications has been very well recognized.UWB antennas are mainly used for wearable MIMO sytems,weather mesurements and also UWB radar applications. Patch antenna can be a good choice for handheld devices in UWB applications.There was a great success in finding a suitable structure for mobile applications.This paper is a review of various methods that enhance the bandwidth and gain of microstrip patch antennas that specifically used for UWB applications. For instance, the UWB utilizes the frequency band of 3.1-10.6 GHz. Conventionally microstrip antennas operating at narrow band width. Broadening the antenna bandwidth is achieved by using the U-slot technique.The performance of the antenna related with its parameters. The variation of antenna performance depends on variation of location of microstrip feed (L) and the partial ground plane size (G).Length of the antenna is another factor that determines directivity and gain. Use of graded substrate also enhances the directivity and band width.Microstrip antenns are used in satellite communication, military purposes, GPS, mobile, missile systems and many more applications.Simulated and measured results are also used to validate the usefulness of the antenna structure for UWB applications.