Hang Wang

Publications (2)0 Total impact

• Conference Proceeding: On the optimum design of a thin absorbing screen

  Zhongxiang Shen, Hang Wang
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  ABSTRACT: This paper presents an analytical study for the optimum bandwidth that a very thin absorbing screen can achieve. Our derived results are valid for an absorbing screen of arbitrary thickness, though very thin. Due to its small thickness, the single-layer screen must be capacitive for impedance matching. It is shown that a series capacitive circuit is a much better choice than the shunt capacitive one, as far as the maximum achievable bandwidth is concerned. It is also interesting to note that under certain conditions a series capacitive circuit can theoretically provide an infinite absolute bandwidth for a thin absorbing screen.
  Antennas and Propagation Society International Symposium, 2007 IEEE; 07/2007
• Conference Proceeding: On the Design of Radar Absorbing Materials Using Left-Handed Transmission Line

  Hang Wang, Wei Tang, Zhongxiang Shen
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  ABSTRACT: A novel radar absorbing material is designed by combining a high impedance surface and a transitional structure. The high impedance surface consists of a two-dimensional periodic array of unit cells that are implemented using a left-handed transmission line printed on a dielectric substrate with lumped elements. A transition between free space and the vertically placed microstrip line is designed using a horizontal strip to ensure that the incident electromagnetic energy can be strongly coupled to the guided wave in the microstrip line. A chip resistor is added in the printed microstrip line of each unit cell to absorb the electromagnetic energy. Both simulated and measured radar cross section results of a conducting plate with 4 times 8 cells show that the absorber has a reduction of 10 dB over a bandwidth 50% at the center frequency of 2 GHz. The thickness of the designed absorber is only 0.13 free-space wavelength at the center frequency. Simulation results of another designed absorber show that it has a wider bandwidth about 92% using a double-substrate structure.
  Microwave Symposium, 2007. IEEE/MTT-S International; 07/2007