Design and Analysis of Various Handset Antennas with the Aid of HFSS

Abstract

In this thesis, an attempt is made to present the design of handset antennas, the proposed handset acts as a thin wire model that represents the backbone of the final antenna. The designed antenna parameters are subjected to optimization to fit into the desired frequency bands. Different antenna types are used, such as wire antennas and planar antennas designed using theHFSS.The design of basic antennas for handset applications, experimented with a simple monopole and dipole in a 3-D form. The monopole and dipole used in handset antennas provides multi-band and broadband properties that cover the desired frequency bands in the handset antennas. The design experiment and analysis of a continuous and unbroken metal rimmed antenna with a monopole which is directly fed with a patch acts as aloo antenna in smart phone applications is proposed. The antenna proposed here provides a straight forward and a good multi-band antenna result for anprotected metal rimmed smart phone. The protected rim and two no-ground portions are set on the both the top and bottom sides of the system circuit board, respectively. The system ground is surrounded between the two no ground portions which are connected to the metal rim with a small grounded patch which divides the unbroken metal rim into two strips. Atlast the dualloop antenna is formed by adjusting the ground plane and the micro strip ina proper way. The design antenna is operated on several number of GSM bands.The second design is study of a balanced antenna with folded architecturefor mobile handset applications with dual-frequency performance (2.40 GHzand 5.00 GHz) for WLAN applications are discussed. The thin-strip planardipole is used as an antenna with folded architecture and two arms on eachmonopole. The folded architectures one on the left and other on the rightacts as a dipole and are capable of providing the multiple bands .The antenna performance is featured by using the antenna radiation pattern,returnloss, power gain and surface current distribution of the antenna. The parametric studies are carried out by varying the antenna height and width of1 mm each, the parameters are optimized for steered impedance matchingwithin the range of frequency bands for both the WLAN and short distance communication systems.The third design is focused on the frequency band (1.8 GHz to 2.45 GHz)in which the balanced antenna for applications of mobile handsets with abandwidth of highly improved performance. The slot planar dipole is usedan antenna here with folded architecture and is having a dual arm on boththe sides of the ground plane. The S-parameter method is used to findthe antenna impedance. In order to obtain the power gain measurementin the antenna.The balanced feed from an unbalanced source is supportedby planar balun which is of wide bandwidth to get the desired gain. The results measured provides a good agreement and also provides good wideband characteristics