Essay On Dielectric Resonator

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The term dielectric resonator (DR) first appeared by Ritchmyer [19], when he showed that unmetallized dielectric objects in the form of toroids could function as microwave resonators. However, his theoretical investigations failed to generate significant interest and practically nothing happened in this area for over 25 years. In the early 1960s, researchers from Columbia University, Okaya and Barash [34-35] reported the first ever DR in the form of a single crystal TiO2. In the mid-1960s, Cohn [36] performed extensive theoretical and experimental evaluation of DR. Nevertheless, the DR was still far from being used in practical applications. A real breakthrough in the dielectric ceramic industry occurred in the early 1970s when researchers…show more content…
Considerable work done on analyzing their resonant modes, radiation characteristics, and various feeding schemes has demonstrated that these “new” radiators could offer new and attractive features in antenna design. Many new elements and arrays with attractive characteristics for wireless and other applications have been implemented and descriptions of some of these are included in the literature [1, 3] Resonance cavities of simple shapes with a metallic coating have been analyzed for a long time as a special case of waveguides. There exist explicit expressions for calculating the resonant frequencies and electromagnetic fields in a resonance cavity [1]. In 1939, Richtmeyer at Stanford University showed that dielectric objects shaped like toroids could be used as microwave resonators [2]. This is where the term dielectric resonator first appeared [3]. It was not until a practical resonator was reported in the early 1960s by Okaya and Barash at Columbia University that the interest regained [3]. This first ever dielectric resonator was made from a single crystal TiO2. The first extensive theoretical and experimental evaluation of the dielectric resonator was carried out by Cohn with colleagues at Rantec Corporation in the mid-1960s [3]. A breakthrough came in 1971 when Masse et al presented the first temperature-stable low loss ceramic of barium tetratitanate [4]. A report from 1975 by van Bladel from the University of Gent, Belgium showed a

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