A Holographic Antenna Approach for Surface Wave Control in Microstrip Antenna Applications

A holographic antenna inspired structure is used to control the surface wave (SW) excited by a microstrip patch antenna. The hologram is designed to support a periodic leaky-wave which radiates at broadside and enhances the radiation of the patch while suppressing the horizontal lobe. In this design, the holographic approach is adapted for patch antenna applications where the SW wavelengths are comparable to the freespace wavelength. This is achieved by introducing dual phase-shifting metallic dipoles with periodic spacings. This paper discusses a simple and intuitive design method for the holographic surface, as well as its integration with the microstrip patch. The initial design concept was developed by assuming small perturbation to the SW, which was subsequently verified through full-wave simulations and prototype measurements. The results verified the improvements in the broadside gain and SW efficiency of the microstrip patch at the cost of increased area.

[1]  G. Gerini,et al.  Planar circularly symmetric EBG structures for reducing surface waves in printed antennas , 2005, IEEE Transactions on Antennas and Propagation.

[2]  Tatsuo Itoh,et al.  Aperture-coupled patch antenna on UC-PBG substrate , 1999 .

[3]  W. Menzel,et al.  A New Travelling Wave Antenna in Microstrip , 1978, 1978 8th European Microwave Conference.

[4]  Henry Jasik,et al.  Antenna engineering handbook , 1961 .

[5]  A.P. Freundorfer,et al.  Planar Leaky-Wave Antenna Designs Offering Conical-Sector Beam Scanning and Broadside Radiation Using Surface-Wave Launchers , 2008, IEEE Antennas and Wireless Propagation Letters.

[6]  Nicolaos G. Alexopoulos,et al.  Simple approximate formulas for input resistance, bandwidth, and efficiency of a resonant rectangular patch , 1991 .

[7]  Filippo Capolino,et al.  Array thinning by using antennas in a Fabry-Perot cavity for gain enhancement , 2006 .

[8]  M. Okoniewski,et al.  Beam-Splitting Condition in a Broadside Symmetric Leaky-Wave Antenna of Finite Length , 2008, IEEE Antennas and Wireless Propagation Letters.

[9]  F. Caminita,et al.  Leaky-wave based interpretation of the radiation from holographic surfaces , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[10]  R. Collin.  Foundations for microwave engineering , 1966 .

[11]  K. W. Lee,et al.  Surface wave control using nonperiodic parasitic strips in printed antennas , 2001 .

[12]  G. Gerini,et al.  On the optimal radiation bandwidth of printed slot antennas surrounded by EBGs , 2006, IEEE Transactions on Antennas and Propagation.

[13]  J. R. James,et al.  Microstrip Antenna Theory and Design , 1981 .

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

[15]  G. Gerini,et al.  1-D Scanning Arrays on Dense Dielectrics Using PCS-EBG Technology , 2007, IEEE Transactions on Antennas and Propagation.

[16]  D. Jackson,et al.  Analysis and Optimization of Leaky-Wave Radiation at Broadside From a Class of 1-D Periodic Structures , 2006, IEEE Transactions on Antennas and Propagation.

[17]  G. Gerini,et al.  Sector PCS-EBG Antenna for Low-Cost High-Directivity Applications , 2007, IEEE Antennas and Wireless Propagation Letters.