Transmit–Receive Isolation Improvement of Antenna Arrays by Using EBG Structures

The mushroom-like electromagnetic band-gap (EBG) structure combined with a choke structure is applied to improve the transmit-receive (T/R) isolation of two X-band large antenna arrays. The basic idea presented is to suppress the surface wave propagation between the T/R arrays by utilizing EBG walls formed through a vertical configuration of the EBG cells, so as to improve the T/R isolation. The isolation level of the arrays with the EBG walls and a metal choke is measured and compared to other isolation methods applied. The experimental results show that by using this combined structure, the isolation level can be improved by at least 30 dB in the radar's operation band, which shows its high efficiency.

[1]  T. Milligan.  Modern Antenna Design , 1985 .

[2]  Reduction of the coupling between microstrip arrays antennas using High Impedance Surface (HIS) structures , 2010, The 40th European Microwave Conference.

[3]  M. Ando,et al.  2-D MoM Analysis of the Choke Structure for Isolation Improvement between Two Waveguide Slot Array Antennas , 2007, 2007 Asia-Pacific Microwave Conference.

[4]  O. Quevedo-Teruel,et al.  Planar Soft Surfaces and Their Application to Mutual Coupling Reduction , 2009, IEEE Transactions on Antennas and Propagation.

[5]  Thomas A. Milligan.  Dipoles, Slots, and Loops , 2005 .

[6]  Per-Simon Kildal,et al.  Artificially soft and hard surfaces in electromagnetics , 1990 .

[7]  R. Shavit,et al.  Microstrip antenna phased array with electromagnetic bandgap substrate , 2004, IEEE Transactions on Antennas and Propagation.

[8]  D. Sievenpiper,et al.  High-impedance electromagnetic surfaces with a forbidden frequency band , 1999 .

[9]  Constantine A. Balanis,et al.  Modern Antenna Handbook , 2012 .

[10]  O. Quevedo-Teruel,et al.  Mutual Coupling Reduction in Patch Antenna Arrays by Using a Planar EBG Structure and a Multilayer Dielectric Substrate , 2008, IEEE Transactions on Antennas and Propagation.

[11]  E. Michailidis,et al.  Mutual coupling reduction in a linear two element patch array and its effect on theoretical MIMO capacity , 2008, 2008 Loughborough Antennas and Propagation Conference.

[12]  C. Caloz,et al.  Compact Elongated Mushroom (EM)-EBG Structure for Enhancement of Patch Antenna Array Performances , 2010, IEEE Transactions on Antennas and Propagation.

[13]  Bin Li,et al.  Analysis and Design of Waveguide Slot Antenna Array Integrated With Electromagnetic Band-Gap Structures , 2006, IEEE Antennas and Wireless Propagation Letters.

[14]  J. Saily,et al.  UC-EBG on LTCC for 60-GHz Frequency Band Antenna Applications , 2009, IEEE Transactions on Antennas and Propagation.

[15]  Weiwei Wu,et al.  Design of an Efficient X-Band Waveguide-Fed Microstrip Patch Array , 2007, IEEE Transactions on Antennas and Propagation.

[16]  Yuan Nai-chang.  Novel method to improve radar transmit-receive isolation , 2008 .

[17]  Y. Rahmat-Samii,et al.  Microstrip antennas integrated with electromagnetic band-gap (EBG) structures: a low mutual coupling design for array applications , 2003 .