K.-M. Mak

The University of Hong Kong, Hong Kong, Hong Kong

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Publications (2)1.04 Total impact

  • K.M. Mak, K.M. Luk
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    ABSTRACT: A novel circular-polarized antenna composed of bowtie patches, cross dipole and a power combiner is presented. Two air microstrip lines are utilized to feed the bowtie patches orthogonally. A 90-degree phase shift Wilkinson power divider is placed underneath the ground and connected to the feeds to generate circular polarization. The antenna attains an impedance bandwidth of 40.2% for return loss better than -15 dB and 3-dB axial ratio bandwidth of 29% (from 1.62 to 2.17 GHz). Very Stable and symmetric radiation patterns with low cross polarization level have been obtained over the operating frequency range. The 3-dB axial ratio beamwidth is about 90deg and the gain of the antenna is about 6.3 dBi with small variation.
    Antennas and Propagation Society International Symposium, 2007 IEEE; 07/2007
  • H. Wong, P.-Y. Lau, K.-M. Mak, K.-M. Luk
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    ABSTRACT: A small circularly polarised (CP) patch antenna with dual T-shaped probe feeds is presented. The patch is folded like a cap to generate a CP wave as well as to reduce the size of the antenna. The proposed antenna is operated at the centre frequency of 2.28 GHz with circular polarisation. The impedance bandwidth (SWR<2) is 21.8% from 2 to 2.49 GHz and the axial ratio bandwidth (AR<3 dB) is 3.5%. The measured gain is around 7.5 dBi. The antenna shows a good CP performance with a symmetric radiation pattern. The total area of reduction is 54% in comparison with the conventional half-wave patch antenna.
    Electronics Letters 01/2006; · 1.04 Impact Factor

Publication Stats

9 Citations
128 Views
1.04 Total Impact Points

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Institutions

  • 2007
    • The University of Hong Kong
      • Department of Electrical and Electronic Engineering
      Hong Kong, Hong Kong