Wideband 3D Frequency Selective Rasorber

This communication presents a 3D frequency selective rasorber (FSR) with bandpass filtering response and wideband absorption characteristics. By loading an array of lumped resistors at one side of a microstrip-line based bandpass frequency selective structure (FSS), multiple resonators, including lossy resonators, are constructed. The bandpass performance with high selectivity is provided by resonators in the substrate region of the microstrip line. The absorption characteristic is obtained by the lossy resonators at the resistor-loaded side of the air region. All reflected waves at the resistor-loaded side can be effectively absorbed by appropriately choosing the resistance value. Physical mechanism of the FSR is analyzed with the aid of an equivalent circuit model and current distributions. As an example, a prototype of the designed FSR is fabricated and tested. Experimental results show that the insertion loss at the center frequency is 2.4 dB and a bandwidth of 114% for the absorption better than 10 dB in the upper rejection band is achieved under the normal incidence.

[1]  Zhongxiang Shen,et al.  An Elliptical Bandpass Frequency Selective Structure Based on Microstrip Lines , 2012, IEEE Transactions on Antennas and Propagation.

[2]  Zhongxiang Shen,et al.  A Novel Band-Reject Frequency Selective Surface With Pseudo-Elliptic Response , 2010, IEEE Transactions on Antennas and Propagation.

[3]  B. Sanz-Izquierdo,et al.  Wideband FSS for electromagnetic architecture in buildings , 2011 .

[4]  Zhongxiang Shen,et al.  Three-Dimensional Dual-Polarized Frequency Selective Structure With Wide Out-of-Band Rejection , 2014, IEEE Transactions on Antennas and Propagation.

[5]  Gang Li,et al.  Adaptive beamforming in time modulated antenna arrays based on beamspace data , 2009, 2009 Asia Pacific Microwave Conference.

[6]  B. A. Munk,et al.  On Designing Jaumann and Circuit Analog Absorbers (CA Absorbers) for Oblique Angle of Incidence , 2007, IEEE Transactions on Antennas and Propagation.

[7]  Zhongxiang Shen,et al.  Angular-stable and polarization-independent frequency selective structure with high selectivity , 2013 .

[8]  H. Shanks,et al.  FOUR-DIMENSIONAL ELECTROMAGNETIC RADIATORS , 1959 .

[9]  Yizhen Tong,et al.  Reduced Sideband Levels in Time-Modulated Arrays Using Half-Power Sub-Arraying Techniques , 2011, IEEE Transactions on Antennas and Propagation.

[10]  Z. Nie,et al.  A Novel Electronic Beam Steering Technique in Time Modulated Antenna Array , 2009 .

[11]  P. Rocca,et al.  Adaptive Nulling in Time-Varying Scenarios Through Time-Modulated Linear Arrays , 2012, IEEE Antennas and Wireless Propagation Letters.

[12]  C. Mias.  Varactor tunable frequency selective absorber , 2003 .

[13]  Shiwen Yang,et al.  Design of a uniform amplitude time modulated linear array with optimized time sequences , 2005 .

[14]  P. Rocca,et al.  Handling Sideband Radiations in Time-Modulated Arrays Through Particle Swarm Optimization , 2010, IEEE Transactions on Antennas and Propagation.

[15]  A. Tennant,et al.  A Two-Channel Time Modulated Linear Array With Adaptive Beamforming , 2012, IEEE Transactions on Antennas and Propagation.

[16]  Kouji Wada,et al.  An experimental study of a ?/4 wave absorber using a frequency-selective surface , 2001 .

[17]  Shiwen Yang,et al.  Synthesis of low sidelobe planar antenna arrays with time modulation , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[18]  Paolo Rocca,et al.  Sideband radiation reduction exploiting pattern multiplication in directive time-modulated linear arrays , 2012 .

[19]  Richard Langley,et al.  Equivalent-circuit models for frequency-selective surfaces at oblique angles of incidence , 1985 .

[20]  Shiwen Yang,et al.  Direction of Arrival Estimation in Time Modulated Linear Arrays With Unidirectional Phase Center Motion , 2010, IEEE Transactions on Antennas and Propagation.

[21]  K. L. Ford,et al.  Oblique Incidence Performance of a Novel Frequency Selective Surface Absorber , 2007, IEEE Transactions on Antennas and Propagation.

[22]  K.P. Esselle,et al.  A novel absorb/transmit FSS for secure indoor wireless networks with reduced multipath fading , 2006, IEEE Microwave and Wireless Components Letters.

[23]  N. Behdad,et al.  Wideband Planar Microwave Lenses Using Sub-Wavelength Spatial Phase Shifters , 2011, IEEE Transactions on Antennas and Propagation.

[24]  Shaoqiu Xiao,et al.  On the Design of Single-Layer Circuit Analog Absorber Using Double-Square-Loop Array , 2013, IEEE Transactions on Antennas and Propagation.

[25]  Chien-Hao Liu.  Frequency selective surfaces and metamaterials for high-power microwave applications , 2014 .

[26]  P. Rocca,et al.  Harmonic Beamforming in Time-Modulated Linear Arrays , 2011, IEEE Transactions on Antennas and Propagation.

[27]  Gang Li,et al.  A Hybrid Analog-Digital Adaptive Beamforming in Time-Modulated Linear Arrays , 2010 .

[28]  F. Costa,et al.  A Frequency Selective Radome With Wideband Absorbing Properties , 2012, IEEE Transactions on Antennas and Propagation.

[29]  A. Tennant,et al.  Experimental Two-Element Time-Modulated Direction Finding Array , 2010, IEEE Transactions on Antennas and Propagation.

[30]  E. Pelton,et al.  A streamlined metallic radome , 1974 .

[31]  B. L. G. Jonsson,et al.  Design of a wideband rasorber with a polarisation-sensitive transparent window , 2012 .

[32]  N. Behdad,et al.  Frequency Selective Surfaces for Pulsed High-Power Microwave Applications , 2013, IEEE Transactions on Antennas and Propagation.

[33]  Alan Tennant,et al.  Beam steering techniques for time-switched arrays , 2009, 2009 Loughborough Antennas & Propagation Conference.

[34]  Christos Mias.  Frequency selective absorption using lumped element frequency selective surfaces , 2003 .