NNLecture22a - Eric Michielssen https/ctools.umich.edu EECS...

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Unformatted text preview: 4/10/2008 Eric Michielssen https://ctools.umich.edu EECS 531 Antennas Theory and Design Lecture 22 Microstrip Antennas Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Microstrip Antennas Introduction Basic construction Patterns Polarization Surface Wave Modes Feed techniques Frequency tuning and multifrequency operation Patch arrays Models Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Introduction Microstrip antennas consist of four parts: • Patch • Dielectric substrate • Ground plane • Feed Microstrip Antennas: Basic Construction K. R. Carver and J. W. Mink. “Microstrip Antenna Technology.” Fig. 5, page 7. © 1995 IEEE. Reprinted from Microstrip Antennas: The Analysis and Design of Microstrip Antennas and Arrays / edited by David M. Pozar and Daniel H. Schaubert, pp. 3-25, ISBN 0-7803-1078-0. IEEE Transactions on Antennas and Propagation , Vol. AP-29, No. 1, pp. 2-24, January 1981. Microstrip antenna and coordinate system Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Advantages of microstrip antennas – Low profile – Conformable to nonplanar surfaces – Low manufacturing cost – Highly integrated with support platform – Versatile elements (impedance, polarization, bandwidth…) – Adaptive elements can made by adding pins or diodes Disadvantages of microstrip antennas – High Q elements (50-75) – Low efficiency – Small bandwidth (1%-5%) Introduction Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Patches with coax (x) or microstrip (---) feed J. P. Daniel, G. Dubost, C. Terret, J. Citerne, and M. Drissi. “Research on planar antennas and arrays: “Structures Rayonnantes”.” Fig. 1, page 26. © 1995 IEEE. Reprinted from Microstrip Antennas: The Analysis and Design of Microstrip Antennas and Arrays / edited by David M. Pozar and Daniel H. Schaubert, pp. 26-50, ISBN 0- 7803-1078-0. IEEE Transactions on Antennas and Propagation , Vol. 35, No. 1, pp. 14-38, February 1993. Representative shapes of microstrip patch elements: square, rectangular, circular, triangular,... Microstrip Antennas: Different Types Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Representative shapes of microstrip patch elements: square, rectangular, circular, triangular,... Microstrip Antennas: Different Types Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Typical feeds for microstrip antennas (Continued) Microstrip Antennas: Different Types (Cont’d) Antennas © Eric Michielssen, University of Illinois at Urbana-Champaign Dipoles and patches EM coupled to microstrip feed J. P. Daniel, G. Dubost, C. Terret, J. Citerne, and M. Drissi. “Research on planar antennas and arrays: “Structures Rayonnantes”.” Fig. 1, page 26....
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NNLecture22a - Eric Michielssen https/ctools.umich.edu EECS...

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