Compact Printed Multiband Antenna With Independent Setting Suitable for Fixed and Reconfigurable Wireless Communication Systems

Abstract

Abstract-This paper presents the design of a low-profile compact printed antenna for fixed frequency and reconfigurable frequency bands. The antenna consists of a main patch, four sub-patches, and a ground plane to generate five frequency bands, at 0.92, 1.73, 1.98, 2.4, and 2.9 GHz, for different wireless systems. For the fixed-frequency design, the five individual frequency bands can be adjusted and set independently over the wide ranges of 18.78%, 22.75%, 4.51%, 11%, and 8.21%, respectively, using just one parameter of the antenna. By putting a varactor (diode) at each of the sub-patch inputs, four of the frequency bands can be controlled independently over wide ranges and the antenna has a reconfigurable design. The tunability ranges for the four bands of 0.92, 1.73, 1.98, and 2.9 GHz are 23.5%, 10.30%, 13.5%, and 3%, respectively. The fixed and reconfigurable designs are studied using computer simulation. For verification of simulation results, the two designs are fabricated and the prototypes are measured. The results show a good agreement between simulated and measured results.Index Terms-Cognitive radio, fixed antenna, independent control, multiband antenna, reconfigurable antenna, small antenna, wide tuning range.

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“…With the rapid development of different wireless communications systems, it is highly desirable if one or more of the above-mentioned antennas characteristics can be reconfigured. Thus, substantial research work has been carried out to reconfigure these characteristics of antennas [1][2][3][4][5][6][7][8].…”

Frequency‐Tunable Monopole Antenna for Wimax Applications

“…To fulfill such demands, antenna as one of the key elements in a wireless communication system needs to have multiband operation. Recently, significant research efforts have been put to study frequency reconfiguration antennas . Frequency reconfigurable antennas can be classified into two categories, namely band switching and continuous tuning .…”

“…In both cases, DC biasing circuits are needed to bias the varactors and PIN‐diodes. The biasing circuits for patch antennas , slot antennas , and planar inverted F‐antennas are relatively easy to design. As mobile users are looking for thinner wireless devices, planar monopole antenna, having simple structure and omnidictional radiation, is becoming more attractive.…”

“…The biasing circuits in Refs. cannot be used to bias varactors placed on the radiators of planar monopole antennas. Our literature review has shown that there is very little work on frequency‐tunable monopole antennas using varactors or PIN‐diodes placed on the radiators.…”