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A Technique for Broadbanding the CPW-Fed Bow-Tie Slot Antenna  

Kim Sung-Hak (Department of Radio Engineering, Graduate School, Chungbuk National University)
Wen Lijun (Department of Radio Engineering, Graduate School, Chungbuk National University)
Ko Han-Woong (Department of Radio Engineering, Graduate School, Chungbuk National University)
park Dong-Hee (School of Electrical, Electronics and Information Engineering, Chungju University)
Ahn Bierng-Chearl (Department of Radio Engineering, Graduate School, Chungbuk National University)
Publication Information
Journal of electromagnetic engineering and science / v.5, no.1, 2005 , pp. 14-20 More about this Journal
Abstract
In this paper, a technique is presented for broadbanding the bow-tie slot antenna fed by a CPW(coplanar waveguide). The bandwidth performance of existing bow-tie slot designs is greatly enhanced by optimizing the slot shape and properly adjusting the characteristic impedance of the coplanar waveguide feeding the slot. To connect the 50-ohm input coaxial line to the CPW feed line, a linear taper in the CPW is employed. The designed antenna shows a 3.5 $\~$ 10.0 GHz impedance bandwidth, a 3.5 $\~$ 6.0 GHz pattern bandwidth, and a 5.5 $\~$ 7.5 dBi gain over 3.5 $\~$ 6.0 GHz. Above 6.0 GHz, the antenna radiation pattern appreciably deviates from the typical dipolar pattern.
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