DOI: https://doi.org/10.15588/1607-3274-2020-1-3

A CIRCULAR SHAPED MULTIBAND SEMI-COMPOUND RECONFIGURABLE ANTENNA WITH FREQUENCY AND PATTERN DIVERSITY FOR WIRELESS APPLICATIONS

Y. Pandurangaiah, R.V. S. Satyanarayana

Abstract


Context. The problem of achieving multi band functionality and two or more reconfiguration capabilities by using a single antenna for diversified Wireless communication applications. The objective of the work is to model a prototype that combines the above functionalities.

Objective. The major goal of the work is to produce a very efficient and compact antenna satisfying all the requirements for wireless applications combining semi compound reconfigurability and multi-band functionality for Wireless communication applications.

Method. This paper reports design and investigations on a planar multi-band frequency– and pattern-circular shaped reconfigurable antenna by the use of PIN diodes. It consists of symmetrically placed, seven PIN diodes on each half of the circle cutting the longitudinal axis. By changing the controlled activation of the slots placed on a circular disk which is fed by Coplanar Waveguide feed, the required reconfiguration mechanism is achieved.  The antenna can be operated in 8 different modes by the use of 15 PIN diodes. A beam shape pattern reconfigurability is achieved by operating the antenna in all the modes. The basic antenna is a circular disk without slots and is designed to operate at 2.4GHz. Frequency reconfigurability is achieved by changing the overall electrical length of the slot by activating the switches in appropriate positions in different operating modes. Pattern reconfigurability is achieved by maintaining the same overall electrical length in each operating mode but changing the switch positions orient in a particular direction in each half of the circle. 

Results. The model has been developed and investigative simulations were carried out using Ansys HFSS.

Conclusions. The proposed antenna resonates at three frequencies 2.2GHz, 4.98GHz and 5.72GHz when operated in pattern reconfigurability mode. A simultaneous frequency reconfigurability along with pattern is achieved with more (at 6.2GHz, 8.2GHz and 9GHz) or less number of new frequency bands (at 7.1GHz) than pattern reconfiguration mode. The area of the antenna occupied is 40 X 60 mm2. An acceptable gain is obtained in all of the operating modes. The prototype of the designed antenna has been developed and the simulation results have been verified experimentally. 


Keywords


Frequency diversity, Pattern diversity, Reconfigurable antennas, PIN diodes, Circular patch, RF switch, Gain.

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References


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GOST Style Citations


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