Showing papers on "Dielectric resonator antenna published in 1969"

A Frequency-Stabilized Microwave Band-Rejection Filter Using High Dielectric Constant Resonators

Abstract: The high permittivity dielectric resonator is a low loss microwave filter element whose size is substantiality less than metal waveguide cavities. Temperature stabilizing their resonant frequency increases the applicability of such elements. A temperature compensated 3-section band-rejection filter using dielectric resonators has been fabricated and tested. The measured electrical performance was comparable to metal waveguide filters and the frequency stability for temperature variations was comparable to brass waveguide cavity filters which are not temperature compensated.

Analysis of the cylindrical confocal laser resonator having a single circular coupling aperture

Abstract: The diffraction losses of the cylindrical confocal resonator having a circular coupling aperture in the center of one of the resonator mirrors have been calculated over the range of resonator Fresnel numbers 0 \leq N_{b} \leq 1.6 by the numerical iteration technique of Fox and Li. The specific paths by which energy is diffracted from the resonator have also been investigated and a class of equivalent resonators found that maximizes the energy diffracted through the aperture for a given value of total diffraction loss.

Synchronous coupling of laser oscillators to a common resonator

Abstract: There is disclosed a source of coherent optical energy in which a plurality of lasers pumped to support multiple axial modes are restricted to either mutually phase-locked multiple-mode operation or synchronized single-mode continuous-wave operation by mutual coupling to a common resonator that is adapted to support an additive buildup of intensity from the lasers in a manner providing mutual mode-frequency locking. The common resonator is either a ring or is an interferometric resonator of relatively great free spectral range compared to that of the laser resonators. Mode-frequency selection is facilitated by active media providing strong mode competition and/or by a common resonator having one or more loss ports that contribute to a strong filtering characteristic.

The Filling Factor of Shielded Dielectric Resonators

Abstract: The use of dielectric resonators at microwave frequencies usually requires a shield to prevent loss of energy by radiation, and a coupling network. The efficiency of a given circuit depends on the filling factor, which expresses the circuit ability to store most of the input energy in the resonator, and little in the coupling network and surrounding space. The resonator is sometimes excited by means of a coupling loop inside the shield, or with a propagating waveguide. In any case, some energy is stored outside the dielectric material. A calculation is presented for the internal and external stored energies, for the case of a rectangular dielectric resonator in a rectangular waveguide. Verification was performed by measuring the insertion loss of an acoustic delay line, which illustrates an interesting application of dielectric resonators.

Notched stripline resonator

Abstract: A new type of stripline resonator is introduced. This is a compact microstrip resonator separated by a pair of notches from the feeder line. The width of the resonator is equal to, or smaller than, the feeder line. The resonator is suitable for d.c. biasing for various applications.

Solid-state oscillator

Abstract: A high-power solid-state oscillator comprising a cavity resonator, a conductive plate positioned in said cavity resonator and in a plane perpendicular to the electric field in said cavity resonator and bisecting said cavity resonator, and at least two solid-state oscillating elements symmetrically positioned respectively on opposite surfaces of said conductive plate and positioned in a plane perpendicular to the axis of said cavity resonator.