MEMS Based Electrostatically Tunable Circular Microstrip Patch Antenna

This paper reports a MEMS based electrostatically tunable circular microstrip patch antenna fabricated using printed circuit processing techniques. The microstrip patch antenna is patterned on the top side of a Kapton polyimide film which is suspended above the ground plane. The resonant frequency of the antenna is tuned electrostatically by applying a DC bias voltage between the patch and the ground plane. The movable patch deflects downward toward the fixed ground plane due to the electrostatic force of attraction caused by the applied DC bias voltage. This deflection decreases the air gap thereby increasing the effective permittivity of the antenna. This increase in effective permittivity results in a downward shift in the resonant frequency. The patch is inductively coupled to a coplanar waveguide (CPW) feed line via a slot in the ground plane. A 6 mm diameter circular patch antenna tunable from 16.91 GHz at 0 V to 16.64 GHz at 165 V, a tuning range of 270 MHz, is presented in this paper

[1]  Kai Fong Lee,et al.  Theory and experiment on microstrip antennas with airgaps , 1985 .

[2]  A. Mortazawi,et al.  An L-band tunable microstrip antenna using multiple varactors , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[3]  J. S. Dahele,et al.  Circular-disk microstrip antenna with an air gap , 1984 .

[4]  R. Ramadoss,et al.  MEMS-based electrostatically tunable microstrip patch antenna using flexible polyimide film , 2005, SPIE Defense + Commercial Sensing.

[5]  R. Ramadoss,et al.  MEMS-Based Frequency Switchable Microstrip Patch Antenna Fabricated Using Printed Circuit Processing Techniques , 2006, IEEE Antennas and Wireless Propagation Letters.

[6]  Afshin S. Daryoush,et al.  Optically tuned patch antenna for phased array applications , 1986, 1986 Antennas and Propagation Society International Symposium.

[7]  Victor M. Bright,et al.  Fabrication, assembly, and testing of RF MEMS capacitive switches using flexible printed circuit technology , 2003 .

[8]  R. Garg,et al.  Microstrip Antenna Design Handbook , 2000 .

[9]  Y. Rahmat-Samii,et al.  Reconfigurable patch antennas for steerable reflectarray applications , 2006, IEEE Transactions on Antennas and Propagation.

[10]  Thomas M. Weller,et al.  Design and tolerance analysis of a 21 GHz CPW-fed, slot-coupled, microstrip antenna on etched silicon , 2002, IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).

[11]  J. Laheurte,et al.  Parametric study of the coupling aperture in CPW-fed microstrip antennas , 1999 .

[12]  I. Bahl,et al.  Frequency agile microstrip antennas , 1982 .