Development of a Resistor-Loaded Ultrawideband Absorber With Antenna Reciprocity
A novel method of developing an electromagnetic absorber is proposed through the design of an ultrawideband resistor-loaded planar dipole absorber. With the method, an antenna array structure is first designed for its best transmission performance and configured as an absorber with the application of the reciprocal principle. The designed planar dipole antenna has achieved a fractional bandwidth of 105% for an absorbing rate of more than 90% under the normal incident. In addition, the thickness of the proposed structure is 0.128λ0 with λ0 being the wavelength at the center operating frequency. Good agreement between the simulated and measured results demonstrates the validity of the proposed method.