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A novel mode-identification approach for permittivity measurement using traveling-wave (TW) whispering-gallery-mode (WGM) resonators is proposed. This approach is based on extracting the attenuation and coupling coefficients of the resonator directly from the measured complex insertion loss values. From both coefficients, the modal index of the resonance frequency will be easily identified. This approach...
A new graphical approach for evaluating the loaded and unloaded Q-factors of traveling-wave (TW) whispering-gallery-mode (WGM) resonators is proposed. This approach is based on extracting the attenuation and coupling coefficients of the resonator directly from the measured complex insertion loss values. The extracted Q-factor values of a measured K-band resonator are verified by using the well-known...
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....
A new 2D quasi-optical slab beam power-combining array is introduced. A key part in the design is the Yagi-Uda like coplanar waveguide (CPW) fed directed antennas. The antennas are used to excite the dominant TM in the slab waveguide. The simulated insertion loss for a three-elements and four-elements based array is better than −4 dB. The proposed design has the advantage of being planar with only...
This paper will present the development of a 30GHz integrated receiver for wireless applications. The purpose is to demonstrate the feasibility of implementing such a device as a monolithic microwave integrated circuit (MMIC) using an inexpensive and readily available technology, a 0.8 μm MESFET process. The receiver module consists of a broadband antenna, a 30 GHz balanced common gate amplifier,...
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