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A small cone-shaped dielectric resonator (DR) fed by a quarter-wave-length monopole has been investigated. The combination between the two resonant frequencies of the monopole and the DR results in an enhanced bandwidth of 3.6:1 ratio with an omni-directional pattern over the entire band. S11 <; -10 dB occurs over 3-10.8 GHz has been experimentally demonstrated, indicating over 113% fractional...
This paper presents a broadband directional coupler using traveling-wave (TW) whispering-gallery-mode (WGM) resonators. The proposed directional coupler consists of two microstrip lines and two thin dielectric disks. The coupling ratio can be controlled by adjusting the spacing between both resonators and transmission lines.
In this paper, a hybrid antenna was presented, consisting of a dielectric ring resonator fed by a quarter wavelength monopole with an upper metal disc. This antenna was capable of achieving a bandwidth response starting from 3 GHz up to 13 GHz. Further designs will be studied to reduce the ground plane size keeping the same bandwidth that covers the whole FCC mask for UWB wireless communications....
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