Theory of Electrically Small Complementary Pair with Inter-Element Coupling.
Abstract
In a previous report, the history of Complementary Pair Element Groups was discussed, and the application of this concept to the matching of electrically small antennas was shown. The measurements indicated a substantial improvement in efficiency as compared to matching with a simple load isolator absorbing the reflected power. In this report, the power delivered to the external region is analyzed for both an individual monopole, and a pair of monopoles, by establishing the scattering matrices for both cases. The potential gain is calculated for the pair over the individual monopole, and it is shown that the pair can deliver up to twice the power to the exterior region if the mutual impedance term is optimized. Various special cases are discussed, varying from full complementarity to zero complementarity, and general conclusions are presented on the optimization of gain-band-width product. Various types of decoys and ECM systems for aircraft and missiles are examples of potential applications of electrically small antennas and scatterers. Large, hardened, ground-based phased arrays and wideband communication base station antennas are typical phased-array applications in fixed stations. Vehicular applications encompass wideband direction finders, aircraft conformal antennas for various functions, and high-performance spacecraft antennas for communications and radar systems. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 10, 1976
- Accession Number
- ADA033791
Entities
People
- Keith M. Soo Hoo
- Klaus G. Schroeder
Organizations
- The Aerospace Corporation