Abstract
Development in field of broadband access technologies is on the rise due to increase in demand of high speed data services for portable devices. Despite recent advances in broadband wireless technologies, there remain a number of critical issues to be resolved. One of the major concerns is the implementation of compact antennas that can operate in a wide frequency band. Another important problem affecting the antenna performance is selecting a proper wideband feed network. The balun provides not only balanced fields but also impedance matching to the antenna. Different kinds of balun have been developed over the past decades. From 1994, several CPW (Coplanar Waveguide) to CPS (Coplanar Strip lines) baluns have been reported. However, these baluns are band limited. To overcome these issues, two designs are proposed in this paper using CPW to CPS wideband balun. First design is using symmetric CPW to CPS balun which uses bond wires and radial slots to do away with the discontinuities between CPW and CPS and we obtain a bandwidth of 2.7 GHz between 1 to 3.7 GHz. Second design is using asymmetric CPW to CPS which does away with the discontinuities without using radial slot and bond wires and we obtain a bandwidth of 5.8 GHz from 2.2 to 8 GHz.
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