Showing papers on "Dielectric resonator antenna published in 1984"

Wavelength division multiplexing optical communications systems.

Abstract: Optical device (T1) comprising a waveguide resonator (10), a photodetector (500) and the resonator is adapted to be evanescently coupled to an optical waveguide (F) and optically coupled to the photodetector (500) wherein the resonator is tunable. The device further comprises an intracavity element (50) optically coupled to the resonator, a control circuit element (100 arranged to tune the resonator and further comprising either a receiver (300) or an optical gain element (200). The optical gain device may be located on a loop or interconnecting two loops.

Piezoelectric contamination detector

Abstract: A piezoelectric detector for determination of the mass or film thickness of gaseous, liquid or solid substances being adsorbed or condensed on the surface of a piezoelectric resonator, having at least one measuring resonator with at least one integrated thin-film sensor, one discrete or integrated on the resonator re-evaporation heating element, and a reference resonator separated from the measuring resonator with a contamination shield, and protected from contamination, but not from heat radiation, with an optical window, which all allow correction by electronic or numerical means of influences of temperature changes on the resonant frequency and of cut-angle deviations and the temperature differences between the resonators.

Dielectric material coaxial resonator filter directly mountable on a circuit board

Abstract: A dielectric material coaxial resonator which includes at least one dielectric material block member having a through-opening axially formed in it in one direction, an inner conductive layer formed on an inner peripheral surface of the through-opening, an outer conductive layer formed on an outer wall surface of the dielectric material block member, an open end face which is provided on at least one end face of the dielectric material block member where the through-opening is opened and at which an outer surface of the dielectric material block member is exposed, and capacitor electrodes formed on the open end face so as to constitute a single resonator unit.

A Composite, Multilayered Cylindrical Dielectric Resonator

Abstract: The analysis of TE modes in a composite multilayered cylindrical dielectric resonator is presented. All cylindrical dielectric resonator structures which have found some practical applications can be treated as a special case of the structure under consideration. These include: single resonator, double resonator, ring resonator, resonator in microstrip, inhomogeneous resonator and others. A new rigorous method of determining the field distribution and resonant frequency of this resonator is presented. By this method the solution is obtained in a form of successive approximations converging to an exact solution. The analysis is applied in detail to the lowest frequency TE mode of double dielectric resonator.

Cavity resonator for atomic frequency standard

Abstract: An improved microwave cavity resonator for use in vapor-cell atomic frequency standards. The resonator comprises a generally-rectangular hollow metallic body designed to support the TE101 mode of standing wave. A dielectric element is positioned within the cavity to concentrate electro-magnetic field so that a compact design is achieved and so that a preselected, substantially uniform magnetic field will be coupled into an alkali metal vapor absorption cell within the resonator. Means are provided for mounting elements of an excitation circuit to preferentially excite the desired TE101 mode.

Rubidium atom oscillator

Abstract: PURPOSE:To make the oscillated frequency highly stable with a subminiaturized and inexpensive device by providing a clock generator, a 1/2 frequency divider circuit, a synthesizer, an atom resonance section and a switch, etc., so as to control the frequency of the voltage controlled crystal oscillator. CONSTITUTION:An output of the voltage controlled crystal oscillator 23 is subjected to frequency modulation by using a pulse frequency-divided by 1/4 from a pulse of a clock generator 20 via 1/2 frequency divider circuits 21, 22. Then the resulting output is synthesized and multiplied by a synthesizer 24 and becomes a resonance frequency of a rubidium atom resonator 25, and is fed to the resonator section 25. The output of the resonator section 25 is given to a DC amplifier 26 and the output is given to a comparator 31 via switches SWs 27, 28 and LPFs 29, 30 together with a signal synthesized by AND gates 37, 38. The result of the comparison in the center frequency f0 of the resonator section 25 is H, L, H, L..., the result is fed to an up-down control terminal of a counter 35 and its output is fed to an oscillator 23 via a D/A converter 36 as a control voltage, the entire loop is locked to make the oscillated frequency highly stable.

A cavity resonator coupling type power distributor/power combiner

Abstract: A cavity resonator coupling type power distributor/ power combiner which can be used either as a distributing amplifier or as a combining unit, and comprising a first cavity resonator having a single coupling terminal (7), a second cavity resonator (6) having a plurality of coupling terminals (8a...8n), and a coupling window (9) or a coupling rod for electromagnetically coupling the second cavity resonator with the first coupling resonator, whereby a wide bandwidth of microwave electric power can be distributed or combined.

Double dielectric resonator stabilized oscillator

Abstract: A double dielectric resonator (1) having lower and upper preferably cylindrical dielectric elements (3, 5, respectively) is used to stabilize an oscillator operating at microwave frequencies. The dielectric elements (3, 5) are separated by a distance (d) which is greater than zero but less than an amount that will eliminate magnetic coupling between the dielectric elements (3, 5), and preferably less than an amount that will push the oscillator into a nonlinear region of the frequency versus separation (d) curve. The major axes (43, 45, respectively) of the dielectric elements (3, 5) are aligned, or else parallel but offset slightly. The invention may be used with reflection type, parallel feedback, and series feedback oscillators. Fine tuning may be achieved by means of a preferably dielectric tuning screw (37), which preferably has a thermal expansion coefficient between those of the dielectric elements (3, 5) and electrically conductive supporting walls (33, 35) to enhance the temperature compensation of the oscillator.

Application of a Dielectric Resonator on Microstrip Line for a Measurement of Complex Permittivity

Abstract: A cylindrical dielectric resonator placed on microstrip line is used for measuring the complex permittivity of microwave low-loss high epsilon/sub r/ dielectric materials. The method is based on the accurate solution of this resonator with TE/sub 01delta/ mode and is compared to the method of dielectric rod resonator with TE/sub 11/ mode. The accuracy of the both method is similar - the measurement accuraoy of relative dielectric constant is better than 0.2 percent and measurement accuracy of loss tangent is about 1·10/sup -4/.

Passive ring resonator gyroscope

Abstract: A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity has a single frequency laser means with internal cavity mounted reflective surfaces to provide a single frequency light source to the second resonator cavity. The single frequency light source is sharply tuned. The second resonator cavity is a passive high Q evacuated cavity having a closed second optical path tuned to resonate at the single frequency light frequency of the first resonator cavity. A cavity servo means is provided for controlling the resonant frequency of the second resonator high Q cavity to simultaneously and substantially track the resonant frequency of the first resonator high Q cavity. An output servo means is provided for detecting the change in frequency of the single frequency light within the second resonator in response to said body rate input to the sensitive axis and for providing an output signal.

Wide band dielectric resonator oscillator having temperature compensation

Abstract: A improved microwave dielectric oscillator module which is provided with a removable temperature compensated dielectric resonator channel element is described. The removable temperature compensated dielectric resonator channel element cooperates with an electrically shielded housing. A substrate is mounted within the housing. Microstrip or stripline conductive patterns deposited on the substrate couple energy from the removable dielectric resonator to the remainder of the oscillator circuitry. The oscillator achieves wideband operation utilizing a GaAs FET transistor as the oscillators active element in conjunction with an intergral trombone-line phase adjuster.

Dielectric trough waveguide antenna

Abstract: A dielectric trough waveguide antenna composed of a metallic guide having a dielectric substrate covering the bottom of the guide and a plurality metal radiators placed periodically on the dielectric at the dielectric-air interface provides a low loss antenna suitable for millimeter wave applications.

Mounting dielectric resonators

Abstract: A microwave dielectric resonator (1), eg for use in a microwave filter or oscillator, is provided with a tough low loss mount (6). The mount comprises a polymeric support layer 4, which is provided with an aperture 3 beyond which the resonator extends. About the first polymer layer 4 are a pair of polymeric retaining layers 2, 2'. These three polymer layers may be heat bonded together to secure the resonator. Interlayers 5 may be used between the three polymer layers 4, 2, 2' in order to effect a bond.

Coupling arrangement for a cavity resonator

Abstract: A coupling arrangement for a cavity resonator (10), in particular for measuring the magnetic resonance of a sample (17) located within the cavity resonator (10) comprises a loop (14) for supplying a radio frequency signal to the cavity resonator (10) and exciting in the latter a specific mode of oscillation. For optimizing the coupling of the radio frequency signal, mechanical means are provided, preferably in the form of an axially adjustable screw (16), which permit the surface of the loop (14) to be varied mechanically, and the loop (14) is capacitively coupled with the resonator housing.

A new microwave ring resonator using guided magnetostatic surface waves

Abstract: A new microwave resonator based on guided magnetostatic surface waves is described. The waves are guided around a closed circular path by nonuniform in‐plane fields. The ring resonator exhibits multiple resonances separated by approximately 10 MHz. Loaded Q’s as high as 1100 with 12 dB insertion loss and 1900 with 26 dB insertion loss have been observed. This resonator eliminates the fabrication complexity and losses associated with array reflector‐type resonators and is potentially more compact since uniform fields over large sample areas are not required.

Analysis and Design of Evanescent-Mode Waveguide Dielectric Resonator Filters

Abstract: The analysis and design of an evanescent-mode waveguide dielectric resonator filter are presented. The filter, consisting of low permittivity dielectric resonators placed in waveguide below cutoff, can be designed up to about 20% bandwidth. Measurements performed in K band are in good agreement with the theory.

Microwave oscillator hermetically sealed and coupled to dielectric resonator

Abstract: The interior of a metal housing is divided by a dielectric substrate into two compartments. At least one of the compartments is kept air-tight. The substrate carries thereon a semiconductor active element chip for oscillation within the air-tight compartment and a dielectric resonator within the other compartment. The chip and the resonator, electromagnetically coupled with the chip, constitute a microwave oscillator whose oscillation frequency can be stabilized. A metal screw is threaded into that wall of the housing which defines the other compartment in a predetermined positional relationship to the resonator. The metal screw is rotatable to vary the distance between the screw and the resonator and, thereby, the oscillation frequency.

Piezoelectric resonator using 165° Y-cut LiNbO3

Abstract: A piezoelectric resonator with a rectangular parallelepiped resonator. A lithium niobate single crystal is used as the resonator chip material. Each of the opposed main surfaces of the resonator chip is arranged to be a surface of a rotated Y-cut plate which is rotated 165±5 degrees about an X-axis. The angle of the longitudinal direction of the resonator chip is arranged to be 90±5 degrees with respect to the X-axis of the rotated Y-cut plate.

Optical resonator with a monomode fibre as ring resonator, and application of such a resonator

Abstract: Optischer Resonator mit einer Monomodefaser als Re sonatorring und Verwendung derartiger Resonatoren. In Systemen der optischen Nachrichten- oder Mess technik mit Ringresonatoren, die uber einen Richtkoppler gespeist werden, lassen sich gegenlaufige Lichtwellen in einem Lichtwellenleiter, dh Reflexionen, vermeiden. Fur derartige Resonatorkonfigurationen sind der " freie Spek tralbereich" (FSR) und die " Bandbreite" (Δf) charakteri stisch. Die Erfindung zielt darauf ab, fur Lichtwellen unter schiedlicher spektraler Breite die erforderlichen Anpassun gen zu ermoglichen. Dazu wird der Faserresonator als ein in sich geschlossener Ring (11) aus einer polarisationserhal tenden Monomodefaser (10) gebildet, die zugleich der reso natorringseitigen Halfte (12 s) eines Faser-Richtkopplers (12), uber den der Resonatorring (11) gespeist wird, einver leibt ist. Ein zweiter Faser-Richtkoppler (13) ist entsprechend aufgebaut und dient zur Anzapfung des Resonatorrin ges (11). Der freie Spektralbereich SFR wird durch die Lange des Resonatorringes (11) bestimmt, die Gute durch die Damp fung. Derartige Resonatoren lassen sich zB fur optische Bandfilter, fur Multiplexer/Demultiplexer und insbesondere als Diskriminator zur Frequenzstabilisierung eines Lasers verwenden.

Microwave filter using dielectric resonator

Abstract: PURPOSE:To manufacture easily a filter by providing plural center electric conductors in a dielectric of an integral construction, forming an electric conductor pattern on the end face of the dielectric by extending it from this center electric conductor, and adjusting this electric conductor pattern. CONSTITUTION:An electrical signal impressed from an input terminal 1 generates an electromagnetic field by a dielectric resonator 3 of an input stage provided in a dielectric of an integral construction, it is transmitted to a dielectric resonator 5 of the next stage through a coupling part 9 formed by an electric conductor pattern 14 and 16 extended from each center electric conductor and provided on the end face of the dielectric, and thereafter, it is transmitted to the next stage one after another in the same way. This electric conductor pattern can adjust not only an interstage coupling quantity but also a resonance frequency of each dielectric resonator 3-8. Also, these electric conductor patterns 14-19 can be adjusted by a mechanical method or an optical method, and also, since a dielectric of an integral construction is used, a filter having a desired characteristic can be manufactured easily.

Hermetically sealed microwave solid-state oscillator with dielectric resonator tuned by electromagnetically coupled terminating admittance

Abstract: A microwave solid-state oscillator includes a casing hermetically enclosing a microwave oscillation device and a dielectric resonator electromagnetically coupled with the microwave oscillation device, an output terminal leading out an oscillation output from said casing, and a microwave terminal electromagnetically coupled to the dielectric resonator, one end of which is connected to a microwave line having a terminating admittance at the outside of the casing.

'Engine-Block', Dual Mode Dielectric Resonator Loaded Cavity Filter with Nonadjacent Cavity Couplings

Abstract: A degenerate mode in a dielectric resonator loaded cavity is utilized to realize a flat, miniature, high performance bandpass filter in side coupled, "engine block" configuration. A novel way of providing coupling between nonadjacent electrical cavities by an interchangeable iris-probe combination is employed to achieve high performance elliptic function response.

Low Loss Fiber Ring Resonator

Abstract: A passive high finesse fiber ring resonator has been demonstrated using ultra low loss directional couplers. The finesse of the resonator was measured as high as 500. Resonator loss were dominated by the fiber attenuation rather than insertion loss of a directional coupler as previously reported elsewhere in recent literature. Further improvement of resonator finesse is feasible and applications of the this device are also discussed. Polarization effects in the resonator have been observed which indicate polarization dependent phenomena are occurring in the directional coupler.

800 MHz Band Channel Dropping Filter Using TM/sub 010/ Mode Dielectric Resonator

Abstract: High Power "Channel Bandpass Filter" for Base station was miniaturized to 1/5 to 1/10 in dimension by using high K dielectric ceramics. The resonant mode is dielectric TM/sub 010/ and its unloaded Q is over 8,000 at 800 MHz. The frequency temperature stability of the filter is less than 0.5ppm/°c.

A Temperature Compensated L-Band Hybrid SAW Oscillator and Resonator Filter

Abstract: A 9 5 0 MHz s u b m l n l a t u r e t e m p e r a t u r e compensated SAW r e s o n a t o r osc I I I a t o r (TCSO) and a SAW r e s o n a t o r f l l t e r a r e d e v e l o p e d I n h y b r l d f o r m f o r a p p l l c a t l o n a s l o c a l o s c l I l a t o r and bandpass f I I t e r f o r a commun lca t l on system. The o s c l I l a t o r package vo lume Is a p p r o x l m a t e l y 0.02 c u b l c i n c h e s and t h e f l l t e r package Is a p p r o x l m a t e i y 0.01 c u b l c I n c h e s . The e x t r e m e l y t l g h t p a c k a g i n g r e q u i r e m e n t s a r e met by u t l l l z l n g c h i p r e s i s t o r s and c a p a c i t o r s , p r l n t e d s p l r a l I n d u c t o r s , and c h i p t r a n s i s t o r s and d l o d e s . The SAW o s c l l l a t o r c o n s i s t s o f a t e m p e r a t u r e s e n s i n g ne twork , a v a r a c t o r d l o d e t u n i n g c l r c u l t , and a s l n g l e p o r t SAW r e s o n a t o r osc 1 I I a t o r . The SAW r e s o n a t o r bandpass f l l t e r c o n s l s t s o f a f o u r e l e m e n t i n p u t m a t c h l n g ne twork , a t w o p o r t t w o p o l e SAW r e s o n a t o r , and f o u r e l e m e n t o u t p u t m a t c h l n g n e t w o r k I n h y b r l d fo rm. T h l s paper d e s c r i b e s t h e d e s i g n , f a b r l c a t l o n and p e r f o r m a n c e o f a SAW r e s o n a t o r c o n t r o l l e d o s c l I l a t o r and a SAW r e s o n a t o r f l l t e r . These c i r c u i t s u t l l l z e h y b r l d t e c h n l q u e s t o a c h i e v e e x t r e m e l y s m a l l s i z e . Tempera tu re compensa t lon I s 1 nc I uded i n t h e osc I I I a t o r t u n I ng n e t w o r k I n o r d e r t o m i n i m i z e f r e q u e n c y s h i f t s . The o s c i l l a t o r p e r f o r m a n c e g o a l s a r e low phase n o i s e ( 5 0 dBc/Hz a t 10 H z ) , modera te RF o u t p u t power (0 dBm), m l n l m a l D C power d r a i n , and good f r e q u e n c y s t a b l l i t y o v e r t h e o p e r a t l n g t e m p e r a t u r e r a n g e o f OOC t o + 5 O o C . The goa l f o r s e t on f r e q u e n c y a c c u r a c y and f r e q u e n c y d r i f t due t o t e m p e r a t u r e I s 2 1 5 ppm. The r e s o n a t o r f l l t e r was d e s l g n e d and mode led u s l n g a t r a n s m l s s l o n m a t r i x approach. Low i n s e r t i o n loss ( 5 d B ) and mlnlmum r i p p l e I n t h e pass band were a c h i e v e d by I n c l u d l n g a m a t c h l n g n e t w o r k I n s i d e t h e m i n i a t u r e package and u s l n g an o v e r l a p a p o d l z a t l o n scheme on t h e t r a n s d u c e r s . QSClLLAIQB Q€3lEl A s i n g l e p o r t SAW r e s o n a t o r was used I n a P l e r c e t y p e h y b r i d o s c l l l a t o r c l r c u i t u t l l l z i n g c h i p t r a n s i s t o r s , d lodes , r e s l s t o r s and c a p a c l t o r s , and a p r l n t e d s p l r a l I n d u c t o r . The c l r c u r t d l a g r a m o f t h e v o l t a g e t u n e d o s c i l l a t o r Is shown In F l g u r e 1 .The P i e r c e osc I I I a t o r c o n f l g u r a t l o n has been shown t o r e q u l r e fewer t u n l n g e l e m e n t s and p r o v i d e b e t t e r s t a b i I i t y t h a n o t h e r c o n f 1 g u r a t i o n s . l The t r a n s l s t o r chosen was a b i p o l a r d e v l c e (HXTR 2001) w l t h 18 dB g a i n and 2 dB n o l s e f l g u r e a t 1 0 0 0 MHz. A b l p o l a r t r a n s l s t o r t y p l c a l l y e x h i b i t s 1 0 t o 15 dB l o w e r phase n o f s e t h a n a comparab le f l e l d e f f e c t t r a n s l s t o r when used I n an o s c l l l a t o r o f t h l s t y p e . 2 A r e s o n a t o r was chosen o v e r a d e l a y I I n e as t h e f r e q u e n c y c o n t r o l l l n g feedback e l e m e n t because o f t h e low phase n o i s e r e q u i r e m e n t . The s i n g l e p o r t SAW r e s o n a t o r s w i n g s I n d u c t i v e a t t h e r e s o n a n t f r e q u e n c y and i s s e r l e s r e s o n a n t w l t h t h e base c a p a c i t o r , cb. A v a r a c t o r d l o d e was i n c l u d e d i n s e r l e s w l t h c a p a c l t o r c b i n o r d e r t o v a r y t h e f r e q u e n c y o f o s c l l l a t l o n . The v a r a c t o r d l o d e chosen was an M S I E l e c t r o n i c s M V 1 4 1 2 . T h l s d l o d e has a nomina l v a l u e o f 1 0 p f , a t u n l n g r a t l o o f 7 . 5 : 1 , and a Q o f 2 0 0 a t 1 MHz. T y p i c a l f r e q u e n c y put I I n g o f t h e o s c l l l a t o r was 4 0 PPM w i t h a t u n l n g v o l t a g e o f 0 t o +6 v o l t s . The RF o u t p u t power was e x t r a c t e d v l a a t a p p e d I n d u c t o r I n an LC t a n k c l r c u i t on t h e c o l l e c t o r o f t h e t r a n s l s t o r . T h l s app roach y l e l d s good o u t p u t power and low ha rmon lc c o n t e n t . SAW 1-PORT RESONATOR VOLTAGE CONTROLLED OSCILLATOR PIERCE COHFIGURATION

Unstable Phase-Conjugate Resonator

Abstract: A fundamental Gaussian mode in a phase-conjugate resonator consisting of conventional optical elements and a phase-conjugate mirror constructed by means of degenerate four-wave mixing is analyzed. A ray matrix method is used for the analysis by taking the finite radii of wavefront curvature and the finite beam radii of pump waves into account. It is suggested that the phase-conjugate resonator is generally an unstable resonator.

Lumped-mode resonator

Abstract: An apparatus and method is disclosed for providing a lumped-mode resonator having increased mechanical stability through mounting of the gap of the lumped-mode resonator to a fixed surface. Temperature stability is also enhanced through attaching the resonator to a printed circuit capacitor whose capacitance will vary in a manner to offset any changes in the inductance of the resonator due to temperature variations. This will maintain a substantially constant resonant frequency over varying temperature conditions.

Statistical analysis of natural oscillations in an unstable resonator containing a weakly inhomogeneous medium

Abstract: The model of a phase screen is used as an approximation in determination of the statistical characteristics of the complex amplitude of the output field of an unstable resonator containing a randomly inhomogeneous medium. A correlation theory and a condition of reproduction of the field in the resonator for each realization of the screen are used in deriving a system of self-consistent integral equations for the determination of the coherence function of the output radiation. An analysis is made and solutions are given for the cases of noncoherent and coherent addition of waves resulting from repeated passage of the field in the resonator through the same inhomogeneities of the medium.