Soft Surfaces for Reducing Mutual Coupling Between Loaded PIFA Antennas

The use of planar soft surfaces to reduce mutual coupling in a new type of planar inverted-F antenna (PIFA) is demonstrated in this work. The proposed antenna is dual-band, single-port, and quite compact, especially for the low frequency of operation. At that frequency band, the mutual coupling is more critical. With the purpose of decreasing this coupling, a solution based on soft surfaces made of simple printed strips with grounded vias is presented, achieving a simultaneous reduction on the mutual coupling level at the two bands of operation of the antenna. In this particular example, only two strips are used and a reduction on the coupling of more than 6 dB is experimentally verified for these two bands and for different distances between elements. The use of a multilayer substrate is a key aspect in the proposed design.

[1]  Vicente Gonzalez-Posadas,et al.  Design of Periodic Metallo-Dielectric Structure for Broadband Multilayer Patch Antenna , 2005 .

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

[3]  Eva Rajo-Iglesias,et al.  BACK RADIATION REDUCTION IN PATCH ANTENNAS USING PLANAR SOFT SURFACES , 2009 .

[4]  X. Chen,et al.  A microstrip patch antenna on the embedded multi-period EBG structure , 2003, 6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003.

[5]  T. Denidni,et al.  Gain Enhancement of a Microstrip Patch Antenna Using a Cylindrical Electromagnetic Crystal Substrate , 2007, IEEE Transactions on Antennas and Propagation.

[6]  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.

[7]  A. Kishk,et al.  Special Issue on Artificial Magnetic Conductors, Soft/Hard Surfaces, and Other Complex Surfaces , 2005 .

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

[9]  A. Nix,et al.  Mutual coupling in multi-element array antennas and its influence on MIMO channel capacity , 2003 .

[10]  E. Rajo-Iglesias,et al.  Comparison of bandgaps of mushroom-type EBG surface and corrugated and strip-type soft surfaces , 2007 .

[11]  Powen Hsu,et al.  Integrated Dual Planar Inverted-F Antenna With Enhanced Isolation , 2009, IEEE Antennas and Wireless Propagation Letters.

[12]  S. Costanzo,et al.  Reduction of Patch Antenna Coupling by Using a Compact EBG Formed by Shorted Strips With Interlocked Branch-Stubs , 2009, IEEE Antennas and Wireless Propagation Letters.

[13]  Tailoring the radiation pattern of patch antennas by using soft/hard surfaces , 2009, 2009 3rd European Conference on Antennas and Propagation.

[14]  A. Kishk,et al.  EM Modeling of surfaces with STOP or GO characteristics-artificial magnetic conductors and soft and , 2003 .

[15]  Chi Ho Cheng,et al.  Reduction of Mutual Coupling Between Closely-Packed Antenna Elements , 2007, IEEE Transactions on Antennas and Propagation.

[16]  Jong Hwa Kwon,et al.  SAR reduction on a mobile phone antenna using the EBG structures , 2008, 2008 38th European Microwave Conference.

[17]  O. Quevedo-Teruel,et al.  Compact Loaded PIFA for Multifrequency Applications , 2010, IEEE Transactions on Antennas and Propagation.