Antenna currents for optimal Q, superdirectivity, and radiation patterns using convex optimization
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7216)/1-21/(2012)
Övrig information: Published version: IEEE Transactions on Antennas and Propagation, Vol. 61, No. 3, pp. 1109-1118, 2013.
The high Q-factor (low bandwidth) and low efficiency make the design of small antennas challenging. Here, convex optimization is used to determine current distributions that give upper bounds on the antenna performance. Optimization formulations for maximal gain Q-factor quotient, minimal Q-factor for superdirectivity, and minimum Q for given far-field are presented. The effects of antennas embedded in structures are also discussed. The results are illustrated for planar geometries.
- Technology and Engineering
- Antenna theory
- Physical limitations
- Antenna Q
- small antennas
- Convex optimization
- Electromagnetic theory