A 20 GHz Steerable Array Antenna Using 3-bit Dielectric Slab Phase Shifters on a Coplanar Waveguide

A simple steerable array antenna is designed and developed using a movable dielectric phase shifter. The change of effective dielectric constant at different dielectric slab positions on a coplanar waveguide is used as the phase shifter. The impedance matching and desired phase shift conditions are satisfied at two slab heights, and the reflection is designed to be minimized at these slab positions. The low-loss dielectric material is used as the dielectric slab and is placed close to a coplanar transmission line with airgap. The 4times4 steerable array antenna with the phase shifters is designed and fabricated at 20 GHz. The H-plane radiation patterns are measured at different phase shift positions and compared with the expected results

[1]  John Litva,et al.  Theoretical and experimental study of feed network effects on the radiation pattern of series-fed microstrip antenna arrays , 1991 .

[2]  H.A.C. Tilmans,et al.  Design considerations and technology assessment of phased-array antenna systems with RF MEMS for automotive radar applications , 2005, IEEE Transactions on Microwave Theory and Techniques.

[3]  R. Hansen.  Phased Array Antennas , 2009 .

[4]  Jianming Jin,et al.  A fast full-wave analysis of scattering and radiation from large finite arrays of microstrip antennas , 1998 .

[5]  J. Speck,et al.  A new high performance phase shifter using Ba/sub x/Sr/sub 1-x/TiO3 thin films , 2002, IEEE Microwave and Wireless Components Letters.

[6]  Junho Cha,et al.  Mechanically steerable antennas using dielectric phase shifters , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[7]  Giovanni Ghione,et al.  Coplanar Waveguides for MMIC Applications: Effect of Upper Shielding, Conductor Backing, Finite-Extent Ground Planes, and Line-to-Line Coupling , 1987 .

[8]  Sang Il Lee,et al.  A CONTINUOUSLY STEERABLE ARRAY ANTENNA USING MOVABLE DIELECTRIC SLABS ON A COPLANAR WAVEGUIDE , 2006 .

[9]  Gabriel M. Rebeiz,et al.  Very low-loss distributed X-band and Ka-band MEMS phase shifters using metal-air-metal capacitors , 2003 .

[10]  Sang-Gyu Kim,et al.  Time-delay phase shifter controlled by piezoelectric transducer on coplanar waveguide , 2003, IEEE Microwave and Wireless Components Letters.

[11]  S. Shtrikman,et al.  A study of microstrip array antennas with the feed network , 1989 .

[12]  E. J. Vanzura,et al.  Improved technique for determining complex permittivity with the transmission/reflection method , 1990 .

[13]  K. Gupta,et al.  Microstrip Lines and Slotlines , 1979 .

[14]  S. S. Bedair,et al.  and Simple Approximate Analytic Formulas for Calculating the Parameters of Supported Coplanar Waveguides for (M)MIC ' s , 1992 .