A flexible shape generation technique (Surface Contour Shape Generation) is combined with multiobjective evolutionary optimization algorithms in order to synthesize geometrically-diverse dielectric resonator antennas and explore the impact geometry has on relevant performance metrics. It shown that noncanonical shapes can improve gain bandwidth when compared conventional antenna geometries. Pre...

We report on the performance of a Fabry–Perot resonator for far-infrared electron spin resonance ~FIR-ESR! at 250 GHz designed to accommodate a thin, disk-shaped sample that must rest with its flat surface perpendicular to the incident FIR beam. This geometry minimizes dielectric losses, making it possible to obtain FIR-ESR spectra of aqueous or lossy samples with a macroscopic ordering, at can...

We have used near-field scanning optical microscopy to measure the internal optical modes inside glass waveguides and microring resonators. The period of the observed standing modes provides a direct measure of the local effective index. The measured effective index and modal shape determines the values of all components of the wave vector. The observed standing modes inside the ring resonator ...

The effect of the patterning process on the nonlinearity of the microwave surface resistance RS of YBCO thin films is investigated. With the use of a sapphire dielectric resonator and a stripline resonator, the microwave RS of YBCO thin films was measured before and after the patterning process, as a function of temperature and the rf peak magnetic field in the film. The microwave loss was also...

Two types of compact microwave plasma ion sources (MWPIS) for focused ion beam (FIB) have been developed. Cavity resonator type plasma ion source is subjected to make resonant electric field in order to ignite plasma efficiently. The optimum length of resonator and antenna, and position of quartz and antenna have been designed by both simple calculation and computer simulation. The other source...

The design of resonators with degenerate magnetic and electric modes usually requires the ability to perturb one or both types of modes in order to induce alignment of magnetic and electric properties. In this paper perturbation theory is used to identify different types of inclusions that can be used to realize fundamentalmode degeneracy in a rectangular dielectric resonator and thus, can ulti...

Capacitively transduced micromechanical disk resonators that exhibit simultaneous low motional resistance (< 130 Ω) and high Q (>70,000) at 61 MHz are demonstrated using an improved ALDpartial electrode-to-resonator gap filling technique that reduces the Q-limiting surface losses of previous renditions by adding an alumina pre-coating before ALD of the gap-filling high-k dielectric. This work i...

This article presents the use of a microstrip dual resonator for nondestructive permittivity characterization of a ferroelectric thin film at microwave frequencies. The dual-resonator measurement fixture consists mainly of two capacitively coupled microstrip resonators, with the ferroelectric thin film covering the gap between the two resonators. The dielectric constant and loss tangent of the ...

A substrate integrated waveguide (SIW) fed rectangular-shaped dielectric resonator antenna (DRA) is proposed for application in the D - Band frequency regime. The Dielectric Resonator (DR) designed to operate higher order modes. narrow slot used excite DR element, leading multiple resonances. resulting structure a multi-resonant operating at six frequencies 123.64 GHz, 125.76 127.4 129.9 134.9 ...

This paper presents the design, fabrication and measurement of the first pull-in free tunable evanescent-mode microwave resonator based on arrays of electrostatically actuated fringing-field RF-MEMS tuners. Electrostatic fringing-field actuation (EFFA) is the key on achieving a wide tunable frequency range that is not limited by the conventional pull-in instability. Furthermore, total lack of d...