Characteristic Mode Analysis: Putting Physics back into Simulation

Characteristic-mode analysis (CMA) enables a systematic approach to antenna design and antenna placement. The approach is based on insight in the fundamental resonance characteristics of antenna geometries and of the structures on which they are mounted. This insight aids in choosing the locations of excitations on an antenna and of the antennas on a platform. Furthermore, knowledge of the coupling between excitations and modes enables a design engineer to synthesize the desired antenna pattern by exciting a linear combination of modal patterns. This is a deterministic approach, which is based on insight in physics. It contrasts with an approach in which an optimization routine is used to explore a large many-dimensional design space with few constraints. This paper offers a refresher on the theory of characteristic modes and presents practical examples that all use CMA in the design process and in the interpretation of results.

[1]  R. Harrington,et al.  Computation of characteristic modes for conducting bodies , 1971 .

[2]  Roger F. Harrington,et al.  Pattern synthesis for loaded N-port scatterers , 1974 .

[3]  R. Harrington,et al.  Characteristic modes for dielectric and magnetic bodies , 1972 .

[4]  R. Garbacz,et al.  A generalized expansion for radiated and scattered fields , 1971 .

[5]  M. Vogel.  Design of the Low-Frequency Compensation of an Extreme-Bandwidth TEM Horn and Lens IRA , 1997 .

[6]  Jaume Anguera,et al.  Ground Plane Contribution in Wireless Handheld Devices Using Radar Cross Section Analysis , 2012 .

[7]  Roger F. Harrington,et al.  Modal analysis of loaded N-port scatterers , 1972 .

[8]  M. Cabedo-Fabres,et al.  The Theory of Characteristic Modes Revisited: A Contribution to the Design of Antennas for Modern Applications , 2007, IEEE Antennas and Propagation Magazine.

[9]  Chao-Fu Wang,et al.  Electrically Small UAV Antenna Design Using Characteristic Modes , 2014, IEEE Transactions on Antennas and Propagation.

[10]  Carl E. Baum,et al.  TEMPORAL AND SPECTRAL RADIATION ON BORESIGHT OF A REFLECTOR TYPE OF IMPULSE RADIATING ANTENNA (IRA) , 1997 .

[11]  Roger F. Harrington,et al.  Control of radar scattering by reactive loading , 1972 .

[12]  D. Ben,et al.  Hybrid Technique of Fast RCS Computation With Characteristic Modes and AWE , 2007, IEEE Antennas and Wireless Propagation Letters.

[13]  Gopinath Gampala,et al.  Compact LTE antenna design using the theory of characteristic modes for smart phone applications , 2013, 2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium).

[14]  Roger F. Harrington,et al.  Optimization of radar cross section of N-port loaded scatterers , 1974 .

[15]  R. Harrington,et al.  Theory of characteristic modes for conducting bodies , 1971 .

[16]  Roger F. Harrington,et al.  Field computation by moment methods , 1968 .