Design and Analysis of Wideband Microstrip Patch Antenna for Wireless Applications

Abstract

In this thesis diverse antenna designs are proposed for wideband applications. As of late, communication is done in wideband and ultra-wideband areas, where high data transmission rate, low power consumption and equipment design is accomplished.
This thesis for the most part focuses on different design techniques to diminish the real disadvantage of MSA i.e. narrow bandwidth.
However, in first proposed design, a wideband MSPA is designed using a capacitive fed suspended E-shape technique, which significantly increases the impedance bandwidth of about 24%. The antenna radiates at a frequency range of 2.310GHz-3.03GHz. Hence, the proposed antenna design can be used at 2.4 GHz for WLAN, USB dongle, and Bluetooth communication.
Second, a wideband U-Slot MSA is design for covering wireless mobile applications. The proposed antenna geometry describes a coaxial fed rectangular patch printed over a FR4 substrate of thickness 1.6mm and a permittivity r  =4.4. Broadening the antenna bandwidth was achieved by the U-slot technique. The operating frequency range is 1.86GHz-2.456GHz with a VSWR  2, and also having a gain of 3.577dB.The proposed antenna can be used in wireless applications like Wi-Fi, WiMAX, and WCDMA 3G, and some 4G LTE.
Third design is a Dual band MSPA with a Defected Ground Structure (DGS) technique. However, DGS is employed for wideband and multiband 2.5GHZ and 3.5GHz communications. The design concept is to have two slots etched out from the ground plane of the MSPA design for 2.5GHz operation to enable second frequency band of 3.5GHz operation. The proposed antenna provides a wide impedance bandwidth of 13.56% (2.3-2.7GHz) and 12% (3.3-3.7GHz) at center frequency of 2.5GHz and 3.5 GHz respectively.
Hence, all of the designs implemented in this thesis do contain the same dielectric substrate with permittivity r  =4.4 and substrate height of 1.6mm achieving a wide impedance bandwidth of a 12% to 24% respectively, and can be used in wireless communication applications like WLAN and WiMAX..