An Effective Synthesis of Planar Array Antennas for Producing Near-Field Contoured Patterns

We present an efficient procedure for the synthesis of planar array antennas to radiate contoured patterns in the near zone of array aperture, as desired in RFID applications. It first grids the target area, and then utilizes a global basis set to span the array's excitations. Each basis's excitation of the array radiates a focused spot beam in the near zone and serves as a local basis function for representing the radiation field. The unknown coefficients of the array's basis set are then found via a minimum least square error (MLSE) technique. It is found that only a small number of basis functions are sufficient to synthesize the radiation pattern, and make the present approach very fast.

[1]  B. Philips,et al.  Synthesis of near-field patterns of arrays , 1987 .

[2]  Youngchel Kim.  On a Uniform Geometrical Theory of Diffraction based Complex Source Beam Diffraction by a Curved Wedge with Applications to Reflector Antenna Analysis , 2009 .

[3]  P. Nikitin,et al.  Antenna design for UHF RFID tags: a review and a practical application , 2005, IEEE Transactions on Antennas and Propagation.

[4]  J. Mead,et al.  A Near Field Focused Microstrip Array for a Radiometric Temperature Sensor , 2007, IEEE Transactions on Antennas and Propagation.

[5]  T.W.R. East,et al.  A self-steering array for the SHARP microwave-powered aircraft , 1992 .

[6]  A. Sebak,et al.  Near field focusing of apertures and reflector antennas , 1997, IEEE WESCANEX 97 Communications, Power and Computing. Conference Proceedings.

[7]  Yahya Rahmat-Samii,et al.  Directivity of planar array feeds for satellite reflector applications , 1983 .

[8]  B. Philips,et al.  Synthesis of near-field patterns of a nonuniformly spaced array , 1987 .

[9]  W. Graham.  Analysis and synthesis of axial field patterns of focused apertures , 1983 .

[10]  Hsi-Tseng Chou,et al.  Feed array synthesis for reflector antennas in contoured beam applications via an efficient and novel Gaussian beam technique , 2001 .

[11]  Hsi-Tseng Chou,et al.  A fast DFT planar array synthesis tool for generating contoured beams , 2004, IEEE Antennas and Wireless Propagation Letters.

[12]  Hsi-Tseng Chou,et al.  Fast Gaussian beam based synthesis of shaped reflector antennas for contoured beam applications , 2004 .

[13]  T. Isernia,et al.  An efficient approach to 2-D arrays mask constrained power pattern synthesis , 1997, IEEE Antennas and Propagation Society International Symposium 1997. Digest.

[14]  Zhong-Min Liu,et al.  A 3 patch near field antenna for conveyor bottom read in RFID sortation application , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[15]  R. J. Acosta,et al.  A method for producing a shaped contour radiation pattern using a single shaped reflector and a single feed , 1988 .

[16]  Changzhi Li,et al.  Wireless Non-Contact Detection of Heartbeat and Respiration Using Low-Power Microwave Radar Sensor , 2007, 2007 Asia-Pacific Microwave Conference.

[17]  P. Pathak,et al.  Extension to a hybrid UTD-MoM approach for the efficient analysis of radiation/scattering from tapered array distributions , 2000, IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (C.

[18]  L. Felsen,et al.  Asymptotic high-frequency Green's function for a large rectangular planar periodic phased array of dipoles with weakly tapered excitation in two dimensions , 2005, IEEE Transactions on Antennas and Propagation.

[19]  Shaya Karimkashi,et al.  Focusing Properties of Fresnel Zone Plate Lens Antennas in the Near-Field Region , 2011, IEEE Transactions on Antennas and Propagation.

[20]  Galen H. Koepke,et al.  A Near-Field Array of Yagi-Uda Antennas for Electromagnetic-Susceptibility Testing , 1985, IEEE Transactions on Electromagnetic Compatibility.

[21]  A. G. Williamson,et al.  Antenna array with beam focused in near-field zone , 2003 .

[22]  Plane-wave synthesis by an antenna-array and RCS determination: theoretical approach and numerical simulations , 2004, IEEE Transactions on Antennas and Propagation.

[23]  Y. Rahmat-Samii,et al.  A generalized diffraction synthesis technique for high performance reflector antennas , 1995 .

[24]  D. Hill,et al.  A Numerical Method for Near-Field Array Synthesis , 1985, IEEE Transactions on Electromagnetic Compatibility.

[25]  Allan G. Williamson,et al.  Microstrip Antenna Array With a Beam Focused in the Near-Field Zone for Application in Noncontact Microwave Industrial Inspection , 2007, IEEE Transactions on Instrumentation and Measurement.

[26]  Hsi-Tseng Chou,et al.  Uniform asymptotic solution for electromagnetic reflection and diffraction of an arbitrary Gaussian beam by a smooth surface with an edge , 1997 .

[27]  H.-T Chou,et al.  A Focused Planar Microstrip Array for 2.4 GHz RFID Readers , 2010, IEEE Transactions on Antennas and Propagation.

[28]  Paolo Nepa,et al.  A hybrid uniform geometrical theory of diffraction–moment method for efficient analysis of electromagnetic radiation/scattering from large finite planar arrays , 2000 .

[29]  J. Sherman.  Properties of focused apertures in the fresnel region , 1962 .

[30]  G. T. Poulton.  Power pattern synthesis using the method of successive projections , 1986, 1986 Antennas and Propagation Society International Symposium.

[31]  Ahmed A. Kishk,et al.  A new Fresnel zone antenna with beam focused in the Fresnel region , 2008 .