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Designing of Reconfigurable Multiband Antenna for WLAN Application
Blekinge Institute of Technology, School of Engineering.
Blekinge Institute of Technology, School of Engineering.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years))Student thesis
Abstract [en]

Remarkable equipment development in the field of communication and the growing end user requirement has lifted the need for multi-functional wireless communication devices. Since antenna is the basic part of each wireless communication scheme and multi-functional antennas are looked-for to meet up the requirements of present progress, those be able to sustain compound functions in a particular antenna constituent by sustaining other than one operational frequency . For this reason reconfigurable multiband antennas can be used basically to lessen the amount of antennas needed for projected system application. Moreover, conventional antennas are deficient in the ability to adjust as altering operating situations that could limits the system performance. Consequently, the use of reconfigurable antennas helps out to overcome incapability of conventional antennas and improve the system recital for example in applications like as cognitive radio where system parameters differ with the changing in circumstances. This thesis purpose is to design of Reconfigurable Multiband Microstrip Antenna equipped with the competence of fine-tuning one of its functioning frequencies independently. Varactor diodes are used, and the capacitance range from 1 pF to 10 pF are engaged to get reconfigualbility and High Frequency Structure Simulator (HFSS) V 13 software tool is used to carry out the antenna designing.

Abstract [sv]

Design of Multiband reconfigurable microstrip antenna furnished with the competency of fine-tuning one of the operating frequencies independently has been reconnoitred in this thesis. High Frequency Structure Simulator (HFSS) V 13 is the software tool is used to achieve antenna designing. Beforehand the antenna planning starts, fundamentals of reconfigurable antenna comprising significant antenna parameters, and several categorizations; approaches can be used to attain reconfigualbility, possible inferences that could get up in designing are explored. Subsequently essentials of HFSS are defined that integrate its structures, significant innovations is V13, methods engaged to solve complications and its submissions. When fundamentals of reconfigurable antennas and HFSS are enclosed, succeeding mission was to design a multiband reconfigurable antenna that can be shared keen on two main parts. First, project a straight multiband antenna and next, examine the design to complement reconfigualbility in it. Once scheming of conventional multiband antenna is talented; after parametric study is supported to inspect the design for accomplishing reconfigualbility. Parametric study comprises the distinction in geometrical parameter of the antenna and perceives its properties on resonant frequency. Future reconfigualbility is completed through variable reactive loading tactic that contains the usage of varactor diodes whose capacitance differs with varying reverse bias voltage. The key objective was to reconfigure the resonant frequency independently, to reach that location of diode is acknowledged by scrutinizing surface current distribution (SCD) and finest location is selected. This thesis has sight seen the design of a reconfigurable multiband microstrip antenna. Reconfigualbility can be accomplished over reconfiguring any of the important antenna parameters for specimen polarisation, radiation pattern and frequency response. Herein work idea of frequency response reconfigualbility is considered and variable reactive loading procedure is engaged, and established on simulation outcomes resulting scrutiny can be ended:  Parametric study produces that independent fine-tuning of all resonant frequencies is attainable. Furthermore it is perceived that patch width and proportions of E-slot concludes the resonant frequency in 3GHz and 5GHz band correspondingly whereas in 4GHz band resonant frequency is fined via L-slot and patch length which can be seen figures 28,33a and 32b.  Projected antenna is echoing at several frequencies and has the capability to fine-tuning its resonant frequency in 5GHz band as shown in figure 34. The analysis based on measured results is as follows:  Implemented multiband reconfigurable antenna is equipped with the capability of altering one of its operating frequencies independently.  Finally, the thesis can be finished as follows: • Aim of the thesis to build multiband reconfigurable antenna is rewarded as multiband response is attained. • Main goal to realize independent fine-tuning of operating frequency is achieved as independent tuning of 5 GHz band is accomplished.

Place, publisher, year, edition, pages
2013. , 70 p.
Keyword [en]
Mulitiband, Reconfiguration, Recunfigurable , Antenna , Parametric Study
National Category
Signal Processing Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:bth-1934Local ID: diva2:829191
0046 727604886Available from: 2015-04-22 Created: 2013-10-19 Last updated: 2015-06-30Bibliographically approved

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