Showing papers on "Dielectric resonator antenna published in 1985"

A 20--40-GHz Push--Push Dielectric Resonator Oscillator

Abstract: A novel coupling method is employed in the design of a push-push broad-band dielectric resonator oscillator for K- and Ka-band operation. The oscillators realized with this technique exhibit excellent spectral purity, power output, and suppression of spurious outputs.

Tunable, dielectric-resonator-stabilized oscillator and method of tuning same

Abstract: A dielectric-resonator-stabilized, Gallium-Arsenide-FET, negative resistance oscillator operating in the microwave region incorporating an improved form of dielectric resonator whose resonant frequency is tuned by the addition or removal of metal from the surface of a dielectric tuning plate in the resonator, and a method for tuning the oscillator to the desired frequency range with the resonator in place by use of a laser-trimming device are disclosed.

Coupling Parameters Between a Dielectric Resonator and a Microstripline

Abstract: The coupling coefficient between a microstripline and the dipolar magnetic (TE/0gamma delta/ ) mode of a cylindrical dielectric resonator is evaluated by using two methods numerical and analytical. Theoretical and experimental extenal quality factors, as well as the scattering matrix parameters which consider the substrate material, the ground plane, and the distance between the line and the resonator, are presented.

Analysis of Dielectric Resonators with Tuning Screw and Supporting Structure

Abstract: The finite-element method is applied to calculate the resonant frequencies and electromagnetic field distributions of axisymmetric dielectric resonator modes. Analyses of several resonator shapes, including ring resonator, double resonator, and rod resonator with tuning screw and supporting structure, are made.

Method and apparatus for measuring angular rate with a passive optical resonator

Abstract: A method and apparatus for reading out angular rates by means of a passive optical resonator provides for the generation of three component light beams individually tuned to distinct resonator modes. One component light beam is radiated into the resonator in the opposite direction to the two other component light beams. By means of an evaluating logic, differences are formed between the counterrotating light beams and the differences weighted and subtracted from each other to provide angular rate. The optical length of the resonator, and, thus, temperature are available as a weighted sum of the differences. Temperature drift may be eliminated from angular rate measurements by compensation according to the invention.

Finite-element analysis of the shielded cylindrical dielectric resonator

Abstract: Results are presented of the application of the finite-element method to evaluate the resonant frequency and external Q-factor Q e of a cylindrical dielectric resonator operating in the TE 01δ -mode, taking into account the effects of the conducting shield and the supporting substrate. Normalised design charts covering a wide range of practical geometrical and physical parameters are presented. Measured values of the resonant frequency and external Q-factor compare well with the theory.

Dielectric resonator oscillators with digital temperature compensation

Abstract: A digital compensation circuit for improving the temperature stability of dielectric resonator oscillators is disclosed. A temperature sensor indicates a measure of ambient temperature which is correlated with an amount of phase shift necessary to compensate for frequency drift in a dielectric resonator oscillator. The correlation is made using a correction table or correction function which is determined empirically in a calibration process. The necessary phase shift is then supplied via a voltage controlled phase shifter. This phase shifter is part of the RF oscillation loop which also includes an amplifier, directional coupler and dielectric resonator filter (including microstrip).

Dielectric Resonator Output Multiplexer for C-Band Satellite Applications

Abstract: A 3-channel C-band manifold-coupled multiplexer using dielectric-loaded filters has demonstrated a viable approach for future satellite output multiplexer. The new multiplexer configuration utilizes dual- and triple-mode dielectric resonator filters coupled onto a ridged waveguide manifold. This design offers significant size and weight reduction while preserving the optimum electrical performance. It is therefore expected that this new output multiplexer design will be used for future C-band satellite systems.

Dielectric filter with variable central frequency

Abstract: A dielectric filter with variable central frequency is provided comprising at least one dielectric resonator formed from a dielectric ceramic body covered with electrodes as well as electromagnetic input and output means for coupling the signal to and from the filter. According to the invention, the filter further comprises a variable capacity connected between the electrodes of the resonator, in a capacitive zone of said resonator, for continuously varying the central frequency of said filter.

800 MHz Band Dielectric Channel Dropping Filter Using TM/sub 110/ Triple Mode Resonance

Abstract: High power and temperature stable "Channel Dropping Filters" for Transmission Multiplexer of base stations have been miniaturized to almost 1/3 the size of the dielectric TM/sub 010/ resonator filter by using triple mode resonance, and we reported on this at the last symposium. The triple mode resonator works as resonators of three independent one-section filters. The isolation level between each two filter was about 40dB.

AT-cut crystal resonator pressure transducer

Abstract: An AT-cut quartz resonator pressure transducer includes a generally disc-shaped resonator section, a housing surrounding the resonator section and joined to the perimeter thereof, with the walls of the housing extending in opposite directions generally normal to the plane of the resonator section. Selected portions of the sidewalls are made thinner than the remaining sidewall portions so that when the housing is immersed in a fluid, a non-uniform stress will be produced in the resonator section. The housing and resonator section are formed so that the frequency of vibration of the resonator section is substantially independent of temperature and relatively independent of temperature transients.

Theoretical analysis of the coupling between whispering-gallery dielectric resonator modes and transmission lines

Abstract: Whispering-gallery dielectric resonator modes coupled to one or two transmission lines form a millimetre-wave directional filter or a millimetre-wave stopband filter. The coupling is discussed and a formula for loaded Q is proposed.

A Novel Method for Characterizing the Surface Resistance of Two Conducting Plates Shorted at Both Ends of a Dielectric Resonator

Abstract: A novel method for characterizing the surface resistance of two conducting plates shorted at both ends of a dielectric resonator is given in this paper. It utilizes only one dielectric resonator that can resonate with both TE012 and TE021 mode at same frequency. The theoretical relations and experimental results are also given. The described method has been proved to be convenient, relatively accurate, and of practical usefulness.

Hybrid-Mode Analysis of Coupled Microstrip-Slot Resonators

Abstract: An advanced microwave and millimeter-wave integrated circuit element, that is, a coupled microstrip resonator with a tuning slot, or a coupled microstrip-slot resonator, has been developed. As speciaf cases, a microstrip-slot resonator, coupled microstrip resonator, and microstrip resonator have been investigated. A hybrid-mode analysis is presented for obtaining resonant frequencies. It is based upon Galerkin's method in the Forier transform domain. The Green functions in this domain, which are versatile and applicable to other microstrip-slot structures, are shown in simple form. Computed resonant frequencies and measured resonant values are compared for aluminum substrates in the 3-7-GHz frequency range.

Dielectric resonator frequency selective network

Abstract: A dielectric resonator frequency selective network. A frequency selective network for microwave circuits is provided whereby a dielectric resonator is coupled to associated circuitry by input and output coupling loops formed in a single circuit board. The two loops are closely spaced, but partially overlapping at a position such that they are substantially decoupled from one another. A dielectric resonator is placed adjacent one of the loops so as to couple one loop to the other through the resonator and to cause the resonator to operate in its dominant mode. The circuit board is constructed by forming conductors separated by insulating material on a ceramic substrate.

Elliptic Microwave Filter using Dual Modes of Dielectric Resonators

Abstract: This paper discusses the electromagnetic and electrical parameters available for the analysis of an elliptic dielectric resonator dual mode filter. An example of a practical filter for 4 GHz frequency is presented.

A New Method for Frequency Modulation of Dielectric Resonator Oscillators

Abstract: This paper presents a new method of electronic tuning, i.e. frequency modulation of dielectric resonator oscillators. The method is based on perturbing the field above the dielectric resonator. A preliminary model showed a frequency shift of more than 40MHz at approximately 16GHz, with a keying rate higher than 20Mb/s. Application of analog frequency modulations is also possible.

Electrical trap construction

Abstract: An improved electrical trap construction for use in a high frequency circuit device, which is so arranged that a coaxial resonator is connected to a core pin of a coaxial connector mounted on a case which contains the device, so that main currents received from a hot signal line flow into or flow out of the coaxial resonator the inner conductive electrode layer of the coaxial resonator is in electrically conducting contact with the core pin of the connector so as to allow the coaxial resonator to provide parallel resonance at a frequency to be trapped.

A compound resonator type semiconductor laser device

Abstract: A compound resonator type semiconductor laser device comprising a multiple-layered crystal structure having a first laser operation area which contains a resonator for laser oscillation and a second laser operation area which contains a resonator a facet of which is shared with that of the resonator in the first laser operation area; and an electric current feeder for injecting a current into said multiple-layered crystal structure, and wherein said facet of the resonator in the first laser operation area, which is shared with the facet of the resonator in the second laser operation area, is covered with a protective film to attain a high reflectivity therein, the other facet of the resonator in the first laser operation area is covered with a protective film to attain a low reflectivity therein, and the other facet of the resonator in the second laser operation area is covered with a protective film to attain a high reflectivity therein.

Magnetically tunable dielectric resonator having a magnetically saturable shield

Abstract: A dielectric resonator 11 is tuned by varying the magnetic flux induced into a magnetically saturable shield 12 mounted adjacent the resonator by varying the flow of current through a coil 17.

Two servo loop passive ring laser gyroscope

Abstract: A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity contains a single frequency laser means to provide a sharply tuned single frequency light source to the second resonator cavity. The single frequency light source is sharply tuned and is split to form first and second sources. The second resonator cavity is a passive high Q cavity having a closed second optical path. The two light sources are fed to the second resonator and propagate as CW and CCW beams within the second resonator. A first servo tunes the frequency of the linear laser to the resonance peak of the CW beam in the second resonator. A second servo means is provided to shift the frequency of the CCW beam to its resonance peak. By converting both servo error outputs into frequency, the relative frequency difference between the CW and CCW beams are recorded as the frequency shift in response to the body rate rotation about the sensitive axis. The second resonator cavity is located and dimensioned in relation to the first resonator cavity to have similar path length changes in response to the induced body dimension changes.

Loop coupled YIG resonator

Abstract: An improved loop coupled YIG resonator has a coupling loop of three sections, a loop section partially encircling a YIG resonator, and two straight end sections. The end sections together with a ground plane enclosing one end of the resonator cavity form a transmission line, the characteristic impedance of which is determined by the distance of the end section above the ground plane. The characteristic impedance is chosen to match the transmission line input to which the coupling loop is connected.

A Superconducting Electron Speed Filter for Establishing High DC Voltages

Abstract: A superconducting cavity resonator made of niobium is used as an electron speed filter. As only electrons with well-defined velocities can pass through the resonator via small apertures in the front and rear faces this device can be utilized for the calibration of high dc voltages Due to the high Q-factor of the superconducting resonator, the selectivity of the filtering system is increased by a factor of 25 as compared with the copper resonator used formerly, and field distortion due to the microwave coupling probes is decreased to less than 1 X 10-5 relative to the unperturbed field within the resonator. The relative uncertainty in the realization of calibration values between 40 and 100 kV is estimated to be 1.2 X 10-4 for an aperture diameter of 50 ?m. When the difficulties in the electron beam adjustment are overcome, a relative uncertainty of a few parts in 105 should be realized, due to the use of smaller apertures.

Practical Aspects and Limitations of Dual Mode Dielectric Resonator Filters

Abstract: In-line configuration of dual-mode dielectric resonator filters is discussed from practical point of view. Available ceramics , mounting arrangements and materials , size limitations , temperature stability and power handling capabilities are addressed. Examples of realized fitters for 1.8 GHz , 4 GHz and 12 GHz frequencies are presented.

Distributed resonator stripline circulator and method for fabricating same

Abstract: A distributed resonator stripline circulator is disclosed wherein a geometrically shaped resonator pattern is deposited upon a like geometrically shaped ferrite substrate A ground plane is deposited upon the opposing side of the substrate which includes grounding wrap-arounds that extend partially onto the resonator face of the substrate Two such resonators are assembled, resonator patterns facing, to form a stripline circulator The grounding wrap-arounds provide electrical connection from the top ground plane to the bottom ground plane to provide superior isolation and control of circulator loading factors

Charge Passing off-Axis through a Cylindrical Resonator with Beam Pipes

Abstract: A charge is considered which passes off-axis through a cylindrical resonator with two semi-infinite beam pipes. In the pipe region the fields are represented by the source fields plus a continuous spectrum of waveguide modes and in the resonator region by an infinite, discrete set of resonator modes. Matching the fields at the common interface yields a set of linear equations for the expansion coefficients. The involved integrals are solved with the residuum calculus, where the poles are located so that only waves travelling away from the resonator region are taken into account. By truncating the system, numerical results were derived for the longitudinal and transverse impedance which, contrary to periodic systems, also have real parts due to radiation into the pipes.

Design considerations for the ENEA-FEL optical resonator

Abstract: The main problems connected with the design of the optical resonator for a free electron laser are briefly analyzed with respect to the optimization of the laser performance. The proper operation of the ENEA free electron laser indeed requires accurate setting and control of both mirror spacing and angular alignment. A long-path Fabry-Perot interferometer with a sensitivity of ∼ 10−6 rad developed for the control of the resonator alignment is described.

Slot tube radio frequency resonator

Abstract: A radio-frequency coil, for nuclear magnetic resonance imaging at Larmor frequencies associated with a magnetic field of greater than about 0.5 Tesla, comprises a slotted-tube radio-frequency resonator having an elliptical cross-section. First and second complementary outer resonator portions have central bands connecting juxtaposed wing structures; the end of each of the four wings is spaced from a complementary wing portion of the other outer portion and capacitively coupled thereto. An inner structure has a pair of elliptical guard rings placed substantially in registration with the elliptical portions of the outer structure wing portions.' The eccentricity ratio of the elliptical cross-section of the resonator and the resonator dimensions are arranged to provide an interior volume into which a human head or body extremity can be placed for imaging purposes.

Coaxial line shape resonator with high dielectric constant

Abstract: A high dielectric constant element suitable for making a coaxial line shape resonator comprises a number of sheets, for instance, of mica or plastic, each having plural pieces of conductive film or electrodes provided on one face with appropriate small gaps inbetween, the sheets being assembled in a pile to form a high dielectric constant element body that has high equivalent e value without using a conventional high dielectric constant ceramic body. Fine adjustment of the resonance frequency of the coaxial line shape resonator is easily made by adjusting number of sheets per length.

Resonator device for a microwave heat applicator

Abstract: The microwave power head or modular heat applicating unit comprising a resonator, a waveguide, a source of microwave energy and a water load device. The resonator is divided into two chambers by a center wall member. A microwave energy receiving antenna means is operatively connected to the center wall for coupling microwave energy into the resonator. A microwave energy transmitting antenna spaced from said receiving antenna is operatively connected to the center wall for transmitting microwave energy from the resonator to a water load. In this manner, the resonator provides a dual function.