Jen-Chen Lu

National Taiwan University, Taipei, Taipei, Taiwan

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Publications (4)0 Total impact

  • Huan-Chu Huang, Jen-Chen Lu, Powen Hsu
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    ABSTRACT: An experiment is performed on a thin dielectric substrate for the compact printed Yagi type antenna described theoretically in [1]. This time the SMA connector at the feed is taken into design considerations. Measured results show that this implemented antenna has a high directivity of 7.3 dBi, a front-to-back ratio of 11.6 dB, a cross-polarization level of −33.5 dB, and 3-dB beamwidths of 73° and 112° in the planes of θ = 90° and ϕ= 90°, respectively. The bandwidth is 9.1%, and the antenna efficiency is 92%. The proposed antenna is suitable for the global positioning system application in the mobile devices whose volumes are usually not sufficient for embedded antennas with good axial ratio (AR) values of right hand circular polarizations and good angular coverage of preferred AR values.
    01/2011;
  • Huan-Chu Huang, Jen-Chen Lu, Powen Hsu
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    ABSTRACT: A planar bi-directional antenna with high directivities in the broadside directions on a thin FR4 dielectric substrate based on the transformation of the Yagi-Uda design rationale is proposed. This design can provide two main beams with high directivities, better than 6.0 dBi, in two broadside directions. The bandwidth is around 5.5% and efficiency of the antenna is 89.3%, which is better than 78.5% or -1 dBi in terms of the 3D average gain.
    Antennas and Propagation Society International Symposium (APSURSI), 2010 IEEE; 08/2010
  • Huan-Chu Huang, Jen-Chen Lu, Powen Hsu
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    ABSTRACT: A simple planar Yagi-Uda antenna with a single director and a concave parabolic reflector on a thin dielectric substrate is proposed. Through the innovative design, the simple Yagi-Uda antenna can achieve the high directivity of 9.0 dBi, front-to-back ratio of 14.5 dB, cross-polarization level of-38.7 dB, bandwidth of 6.0%, and the radiation efficiency of 85.1%, i.e., better than -1 dBi in terms of the 3D average gain. This proposed antenna is especially suitable for the mobile devices with GPS functions.
    01/2010;
  • Huan-Chu Huang, Jen-Chen Lu, Powen Hsu
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    ABSTRACT: A planar Yagi-Uda antenna with a single director, a meandered driven dipole, and a concave parabolic reflector on a thin dielectric substrate is proposed. Through this design, the high directivity of 7.3 dBi, front-to-back ratio of 14.7 dB, cross-polarization level of -39.1 dB, bandwidth of 5.8%, and the radiation efficiency of 87.5%, which is better than -1 dBi in terms of the 3D average gain, can be achieved. Besides, the area of this antenna is much smaller than that of the previously proposed one by about 78%. Therefore, the proposed antenna is suitable for the GPS (Global Positioning System) application in mobile devices whose volumes are usually not sufficient for embedded antennas with a good RHCP (right hand circular polarization) AR (axial ratio) values and not enough angular coverage of the designed AR values.
    01/2010;

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5 Citations

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Institutions

  • 2010
    • National Taiwan University
      • Graduate Institute of Communication Engineering
      Taipei, Taipei, Taiwan