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Application of gain-bandwidth bounds on loaded dipoles

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4 Author(s)
Derneryd, A. ; Electr. & Inf. Technol., Lund Univ., Lund, Sweden ; Gustafsson, M. ; Kristensson, G. ; Sohl, C.

Physical limitations based only on antenna volume, form factor and material parameters are applied to electrically small antennas in the form of single dipoles. The upper bound on the gain-bandwidth product is solely determined by the polarisability matrix that characterises the antenna when it is immersed in a uniform applied static field. The polarisability, and hence the bandwidth, is increased by loading the dipole arms close to their ends. The half-power impedance bandwidth is increased from 5 to 13% by moving the coils from the centre to the ends of the dipole arms. The introduction of a stub-matching further improves the bandwidth but the physical limit is not reached. Finally, a dual-resonance dipole antenna is analysed. It is observed that a second resonance hardly reduces the bandwidth of the first resonance if the resonances are separated more than 1.7 times in frequency.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:3 ,  Issue: 6 )

Date of Publication:

September 2009

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