The temperature sensor presented in this paper is based on a microwave dielectric resonator, which uses alumina ceramic as a substrate to survive in harsh environments. The resonant frequency of the resonator is determined by the relative permittivity of the alumina ceramic, which monotonically changes with temperature. A rectangular aperture etched on the surface of the resonator works as both...

A post-wall waveguide-fed parallel-plate slot array antenna [1–3] has been proposed as a highgain, high-efficiency and mass producible planar antenna in millimeter-wave applications. The authors are developing post-wall waveguide slot arrays using a copper-clad dielectric substrate which reduces the cost of waveguides structures by printed circuit board (PCB) fabrication technique. The transmis...

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...

this paper describes the design of a 2x2 micro strip patch antenna array in the frequency of 9.5ghz for radar applications, using substrate integrated waveguide, siw, for feeding network. the micro strip patches are aperture-coupled with the feeding network of siw. the feeding network consisting of a perpendicular coax-to-siw transition and two y-junction power dividers. the antenna is simulate...

A new design of a circularly-polarized (CP) trapezoidal dielectric resonator antenna (DRA) for wideband wireless application is presented. A single-layered feed is used to excite the trapezoidal shaped dielectric resonator to increase resonant frequency and axial ratio. Besides its structure simplicity, ease of fabrication and low-cost, the proposed antenna features good measured impedance band...

A novel technique fitr the bat dividth enhancement of conventional rectangular microstrip antenna is proposed in this paper. When a high permittivity dielectric resonator of suitable resonant frequency was loaded over the patch. the % bandwidth of the antenna was increased by more than five tunes without much affecting its gain and radiation performance. A much more improved bandwidth was obtai...