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Design of CPW-Fed Printed Monopole Antenna for CDMA/WLAN

CDMA/WLAN 겸용 CPW 급전 인쇄형 모노폴 안테나 설계

Nam, Ju-Yeol;Song, Won-Ho;Lee, Young-soon
남주열;송원호;이영순

  • Received : 2015.11.26
  • Accepted : 2015.12.10
  • Published : 2015.12.30

Abstract

In the present study, a coplanar waveguide (CPW)-fed printed monopole antenna with an inverted n-shaped slot is newly proposed for dual band operations which cover bandwidths of CDMA (1.85~2.025 GHz) and WLAN (2.4~2.484 GHz) as well as implementation of omnidirectional radiation pattern. For enhancement of impedance bandwidth ($S11{\leq}10dB$) in 2.4 GHz WLAN frequency band, an inverted n-shaped slot instead of the previous n-shaped slot is etched on the printed radiating monopole. The proposed antenna is designed and fabricated on one side of FR4 substrate with dielectric constant of 4.4, thickness of 1.6 mm, and size of $50{\times}25mm^2$. It has been observed that the measured impedance bandwidths are 280 MHz (1.84~2.12 GHz) in frequency band of CDMA and 420 MHz (2.38~2.8 GHz) in WLAN frequency band respectively. It is noticeable that impedance bandwidth in 2.4 GHz frequency band of WLAN is enlarged to three times due to use of inverted L-shaped slot in comparison with impedance bandwidth 140 MHz (2.39~2.53 GHz) obtained by use of the previous n-shaped slot. In addition, good omnidirectional radiation patterns have been observed over the entire frequency band of interest.

Keywords

Printed monopole;L-shaped slot;Dual band for CDMA/WLAN;Omni-directional radiation pattern

References

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Acknowledgement

Supported by : 금오공과대학교