диафрагмированные волноводные фильтры / 767b73b0-3cbe-4429-8ede-2f2c4b3fd479

These Patent Abstracts of recently issued patents are intended to provide the minimum information necessary for readers to determine if they are interested in examining the patent in more detail. Complete copies of patents are available for a small fee by writing: U.S. Patent and Trademark Office, Box 9, Washington, DC 20231.

Superconducting Radio-Frequency Bandstop Filter

Abstract— A bandstop filter contains one or more resonant circuits connected by interconnecting transmission lines. The resonant circuits each have a transmission line connected between two capacitors. One capacitor is connected to the interconnecting transmission line and the other capacitor is connected to ground. The resonant circuits may have a helical coil of superconducting materials as the transmission line. The capacitors may be in the form of screws, which can be inserted into or removed from the center of the helix. The helix may be formed as a discrete structure and supported by a low-loss material within a housing.

19 Claims, 5 Drawing Sheets

tubular piston, the second waveguide wall being opposite to the first waveguide wall. The tubular piston is pressed in the direction of the package. That end (117; 217; 317) of the tubular piston that faces away from the second waveguide wall is open, and slits (120; 220; 320) are arranged at this end, the slits stretching mainly in the direction of the tubular piston. A pressing element

(156; 255; 260; 355; 360; 364) presses the edge (165; 265; 365) of the

end with the slits against the walls of the hole, resulting in a good mechanical and galvanic contact between the piston and the walls of the hole. The distance from the edge to the first waveguide wall is one half of the working wavelength of the circulator.

26 Claims, 3 Drawing Sheets

Waveguide Circulator Having Piston Movable Against

Ferrite Puck

Abstract— The present invention relates to circulators for microwave frequencies and higher frequencies. The circulator (100; 200; 300) of the invention comprises a waveguide system, the waveguide system being situated in a waveguide house. A hole (111; 211; 311) is arranged in a first waveguide wall (171; 271; 371) of the waveguide system. A tubular piston (114; 214; 314) is arranged so that it can slide in the hole. A package, comprising ferrite material (132; 135; 235; 235; 332; 335) in the shape of pucks, is arranged between a second waveguide wall (174; 274; 374) and the

Publisher Item Identifier S 1051-8207(00)06186-9.

High Power Superconductive Filters

Abstract— The high power band-pass filters are made of sections of circular waveguide resonators with sections of waveguide in between them. In the center of the waveguide resonator a ferroelectric disc, with a hole in the center, is placed. A bias is applied to the inner side of the ferroelectric disc. On the application of a bias voltage, the permittivity of the ferroelectric disc changes. As a result, the resonant frequency of the circular cavity changes. Application of different levels of bias voltages produces different resonant frequencies of the filter. The interior conducting surfaces of the waveguide(s) and the waveguide resonator(s) have high Tc superconducting material and the waveguide flanges have high Tc superconducting material on the conducting surfaces. The band-stop filters are made of a section of a main waveguide with branch waveguide resonator(s) connected on the broad-wall of the main waveguide with waveguide sections in between the resonators. A ferroelectric circular disc, with a hole in the middle, is placed in the middle of the branch guide. The branch waveguide loaded resonator is tuned to the dominant mode resonant frequency. A bias voltage is applied to the inner side of the ferroelectric disc changing the permittivity of the ferroelectric material and consequently changing the resonant frequency of the band reject filter.

Three Dimensional Polyhedral-Shaped Microwave

Switches

Abstract— A dielectric microwave filter includes a dielectric body, a trinity of first, second and third resonant slots, a pair of cavities for transmitting input/output signals, a pair of slits, and a trinity of first, second and third resonant holes. Each of the resonant slots (and an associated resonant hole in some embodiments) functions as a resonator having a quarter wavelength. Each of the slits modulates a coupling of electromagnetic fields among the resonant slots (and resonant holes if present). All surfaces of the dielectric microwave filter are completely covered with an electrically conducting material, except for front and top surfaces of the dielectric body. Since the resonators having a quarter wavelength may have reduced surface dimensions, the filter may accommodate associated surface input/output coupling cavities and also be more easily manufactured in a miniaturized structure. In addition, since the filter provides inductive coupling between resonators, it may better preserve a desired overall filter performance.

18 Claims, 4 Drawing Sheets

IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

12 Claims, 11 Drawing Sheets

Waveguide Window

Abstract— The waveguide window assembly disclosed herein is particularly adapted for use in conjunction with a waveguide housing of a high expansion material such as aluminum. The window is formed of a glassy material having a relatively low coefficient of thermal expansion and is provided with a frame of a material having a matching coefficient. The housing is provided with an opening for receiving the frame with substantial clearance. A wall member is interposed between the frame and the edges of the opening with solder filling the space between the wall member and the frame and also the space between the wall member and the edges of the opening, the wall member being constructed of a material having a coefficient of thermal expansion which is intermediate those of the housing material and the frame material.

9 Claims, 3 Drawing Sheets

287

material having a lower refractive index than the core material. The waveguide connector is pressed toward the polymeric multilayer laminate so that the topographic pattern in the waveguide connector stands out in relief in the laminate to form the waveguide pattern in the waveguide connector and where the multilayer laminate is fixed in the waveguide connector after pressing.

40 Claims, 6 Drawing Sheets

E–H Matching Device and Apparatus and Method for Automatically Matching Microwave Impedance

Abstract— An E–H matching apparatus includes an E-plane branch waveguide connected to an E-plane of a waveguide body, an H-plane branch waveguide connected to an H-plane of the waveguide body, and plungers provided in the E-plane branch waveguide and the H-plane branch waveguide, respectively. The plungers are moved to establish impedance matching between the waveguide and a load. The H-plane branch waveguide has a bend portion formed in close proximity to the waveguide body.

27 Claims, 23 Drawing Sheets

Microstrip Dual Mode Elliptic Filter with Modal Coupling Through Patch Spacing

Abstract— Disclosed is a planar dual mode microstrip filter with the coupling between similar modes on different patches governed by the spacing between the patches rather than by microstrip coupling lines between the patches. The patches are shaped to allow dual mode coupling. The materials used in building this filter were an alumina substrate with gold metallization. The filter is encased in a conducting box made from a conducting material. One advantage of the proximity coupled structure is that it reduces the number of parts, complexity and allows the filter to be realized in a smaller space than in previous dual mode designs. This filter is useful in satellite communications, radar, and cellular communications. High temperature superconductor materials can be used in a planar microstrip form.

15 Claims, 3 Drawing Sheets

Filter Device Having a Dielectric Resonator and a Coupling Loop with Adjustable Coupling between the Dielectric Resonator and the Coupling Loop

IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

Mach–Zehnder Interferometric Devices with Composite Fibers

289

a function of the deviation of the operating frequency from a desired value. For more precise control the enclosure is preferably immersed in a cryogenic cooling system.

8 Claims, 4 Drawing Sheets

Dielectric Resonator Tunable Via a Change in Gas

Pressure

Abstract— A dielectric resonator encased within a pressure enclosure establishes the operating frequency of a microwave circuit. The enclosure is supplied with a pressurized gas and the pressure within the enclosure is varied as

Abstract— A balun structure is formed by stripline or square coaxial transmission lines and stacked dielectric substrates. The invention provides a technique for building a balun that maintaines low insertion loss and good balance for DC-to-GHz applications. The impedance ratio of the balanced transmission line to the unbalanced transmission line is N : 1, where N is the number of microstrip transmission lines in the balun. This will prevent the signal loss that occurs when ferrite cores are placed around the transmission lines.

19 Claims, 6 Drawing Sheets

290

LC Resonating Component and Method of Making

Same

Abstract— An LC resonating component, such as multilayered LC filter 1, is provided having a high Q-value and a low profile. The filter 1 comprises an insulating sheet 2 having a ground electrode 3 on its surface and in its center a via hole 7 connected to the ground electrode 3, an insulating sheet 2 having a via hole 4 in its center, insulating sheets 2, 2 having capacitor electrodes 5, 6 on their respective surfaces, and a protective insulating sheet 2. The via hole 7 is connected to the via hole 4, wherein the via holes 4 and 7 together comprise an inductor conductive body 8. The inductor conductive body 8 is perpendicular to the planes defined by capacitor electrodes 5, 6, and thus the magnetic flux created around the inductor conductive body 8 does not penetrate the capacitor electrodes 5, 6.

19 Claims, 14 Drawing Sheets

IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

opening, a first conductor plate disposed by being spaced apart from the dielectric substrate by a predetermined distance, and a second conductor plate disposed by being spaced apart from the dielectric substrate by a predetermined distance, wherein at least one of said first and second conductor plates is electrically connected to at least one of said first and second electrodes. The region of the dielectric substrate defined between the first and second electrodes, a free space defined between the first electrode and the first conductor plate and another free space defined between the second electrode and the second conductor plate are cut-off regions for attenuating a high-frequency signal having the same frequency as the resonance frequency. This dielectric resonator can be used in a millimeter wave band, can resonate with markedly small variations of its resonance frequency even if the temperature thereof varies, and can be manufactured at a low cost.

15 Claims, 33 Drawing Sheets

Dielectric Resonator and Filter Utilizing a Non-Radiative

Dielectric Waveguide Device

Abstract— A dielectric resonator capable of resonating at a predetermined resonance frequency has a dielectric substrate, a first electrode formed on a first surface of the dielectric substrate and having a first opening, a second electrode formed on a second surface of the dielectric substrate and having a second

Abstract— Stronger electromagnetic coupling than in conventional devices can be provided between adjacent resonator holes in a dielectric filter or a dielectric duplexer without changing the external shape and dimensions of a dielectric block. Resonator holes pass through opposing surfaces of a dielectric block, each including a large-diameter hole section and a small-diameter hole section. The small-diameter hole sections may be formed near a short-circuit end face of the dielectric block. The large-diameter hole sections and the small-di- ameter hole sections are connected to each other with their axes shifted from each other. The radius R of the large-diameter hole sections, the radius r of the small-diameter hole sections, and the shift distance P between the axes of the large-diameter hole sections and those of the small-diameter hole sections satisfy the expression R-r<P<R+r.

Abstract— A high power water load for microwave and millimeter wave radio frequency sources has a front wall including an input port for the application of RF power, a cylindrical dissipation cavity lined with a dissipating material having a thickness which varies with depth, and a rear wall including a rotating reflector for the reflection of wave energy inside the cylindrical cavity. The dissipation cavity includes a water jacket for removal of heat generated by the absorptive material coating the dissipation cavity, and this absorptive material has a thickness which is greater near the front wall than near the rear wall. Waves entering the cavity reflect from the rotating reflector, impinging and reflecting multiple times on the absorptive coating of the dissipation cavity, dissipating equal amounts of power on each internal reflection.

9 Claims, 2 Drawing Sheets

Multilayer Ceramic Package with Floating Element to Couple Transmission Lines

Abstract— A multilayer ceramic package (200) with a floating element (202) to couple transmission lines (214) is disclosed. The package (200) has numerous dielectric layers (204A{204I) including an input electrode (206), an output electrode (208), a top ground plane (210) and a bottom ground plane (212). Transmission lines (214) are formed on some of the dielectric layers (204A{204I). Floating element (202) adjusts the electrical coupling between the transmission lines (214) and is spatially separated therefrom. This may provide the advantage of increased capacitive coupling between transmission line resonator structures in a multilayer packages, including nonadjacent resonant structures, without increasing the overall dimensions of the package (200). The floating element (202) may also increase the operable passband of a multilayer bandpass filter or provide a low-side transmission zero.

Dielectric Filter Having a Pattern Electrode Disposed within a Dielectric Body and Manufacturing Method Thereof

Abstract— Grooves are formed on the connection faces of two dielectric base plates in a dielectric resonator. Internal conductors are provided on the inside faces. Coupling electrodes are formed on another dielectric base plate. These three dielectric base plates are connected so that the coupling electrode effects a capacity connection between the internal conductors. This arrangement permits an earth electrode (e.g., an external conductor) to be formed on almost the full exterior of the dielectric resonator, thereby preventing the reduction of the Qo of the resonator and electromagnetic field leakage.

Tunable Resonators

Abstract— In a magnetically-tunable resonator, a wave-guiding structure comprising an electromagnetic frequency filter, or component of such a filter, is placed in sufficient proximity with a magnetic structure so as to be gyromagnetically coupled therewith. The resonator is supportable of two fundamental normal modes of propagation which, in the absence of magnetic interaction are even and odd with respect to the resonator center plane of symmetry. Each normal mode possesses a spectrum of resonance frequencies. When the magnetic structure is magnetized, the formerly even and odd modes become mixed due to gyromagnetic interaction, and the resulting wave fields become elliptically polarized. With appropriate design such that the identities of the modes are preserved under conditions of resonance, this in turn results in a nonreciprocal reinforcement action in the resonator, which leads to the desired shift in resonance frequency in at least one of the two normal modes. The device is especially attractive to application in miniaturized planar microwave devices, for example MMIC’s, in conferring small size and weight, simplicity of structure, low power required for tuning, capability of fixed, continuous or digitally-stepped frequencies, and low-loss high-Q performance; applicable with superconducting or conventional metallic conductors.

30 Claims, 8 Drawing Sheets

Suspended Monolithic Microwave Integrated Circuit

and Method of Manufacture

Abstract— A MMIC for providing a suspended transmission medium, comprising a MMIC chip, an upper ground plane overlying and spaced from critical circuitry and a lower ground plane underlying and spaced from the critical circuitry. The upper and lower ground planes are spaced from the critical circuitry at electrically similar distances. The portion of the MMIC chip that has the critical circuitry is suspended over a recess in the housing floor.

22 Claims, 1 Drawing Sheets

Apparatus and Method for Dissipating Charge from Lithium Niobate Devices

Abstract— Embodiments of the invention include an apparatus and method for stabilizing the operation of lithium niobate devices such as modulators due to charge accumulation caused by, e.g., pyroelectric and piezoelectride effects. The apparatus comprises a substrate having a waveguide formed therein, a buffer layer formed on the substrate, a SiTi N charge dissipation layer (CDL) formed on the buffer layer and a set of electrodes formed on the charge dissipation layer. According to embodiments of the invention, the SiTi N charge dissipation layer has a resistivity of approximately 15–150 k cm. Alternatively, the apparatus includes a second charge dissipation layer formed on the opposing surface of the substrate. The charge dissipation layer according to embodiments of the invention is advantageous in that it provides a suitable resistivity and is a composition that is easily reproducible using conventional formation techniques such as sputtering.

19 Claims, 2 Drawing Sheets

Planar Waveguide and Method of Forming the Same

Abstract— The invention relates to a waveguide and a method of forming a waveguide. The waveguide includes a corrugated polymer sheet having a top layer, a middle layer, and a bottom layer. Each of the top layer, the middle layer, and the bottom layer are defined by an index of refraction.

12 Claims, 6 Drawing Sheets

Abstract— A high efficiency radio frequency (RF) impedance matching network containing an “L-type” inductor-capacitor (LC) circuit where the capacitor is a variable capacitor coupled from an input port to ground and the inductor is a variable inductance inductor coupled from the input port to an output port. A blocking capacitor is provided between the inductor and the output port and a ceramic capacitor is coupled in parallel across the variable capacitor. The impedance match is tuned by physically adjusting tuning elements of both the inductor and capacitor. The variable inductor contains an improved inductor tuning element that optimizes current flow in the tuning elements and inductor. To further improve the efficiency of the matching network, the assembly uses an improved enclosure interior finish and various circuit optimization techniques that reduce contributions to match loop resistance.

Dielectric Filter Unit Comprising Internal Conductors and a Slit with an Electrode for Input/Output Coupling Structure

Abstract— A miniaturized dielectric filter unit exhibiting desired characteristics is formed in which a plurality of resonators are disposed within a dielectric block. A plurality of internal conductors are disposed within the dielectric block. An external conductor and an input/output electrode are formed on an outer surface of the dielectric block. A slit having an electrode therein, which is electrically connected to the input/output electrode, is provided each of between two adjacent through-holes having the internal conductors therein. Thus, unwanted coupling between the input/output sharing filters is prevented, and an external coupling circuit is configured by capacitive coupling. It is thus possible to individually design the respective filters and further to enhance easy designing of the overall filter unit. A transmitting/receiving-sharing unit and a multiplexer, both of which are similar to the above-described dielectric filter unit, are also provided.

Suppression of Spurious Cavity Modes Using Resistive Paste on a Ceramic Transverse-Electromagnetic-Mode (TEM) Filter

Abstract— A ceramic transverse-electromagnetic-mode filter having a resistive paste base and resistive paste layer and method of tuning same is provided. The ceramic filter includes a filter body (200) comprising a block of dielectric material and having top (202), bottom (204) and four side surfaces (206; 208; 210; 212) including vertical edges (214). The filter also has metallized through-holes providing transverse-electromagnetic-mode resonators (210). At least one vertical portion in proximity to the vertical edges (214) of the block on at least one of the side surfaces is unmetallized providing a resistive paste base (218). A resistive paste layer (219) of predetermined resistivity is deposited thereon. The resistive paste layer attenuates a set of parasitic spurious responses in the filter frequency response curve while simultaneously maintaining a desired transverse-electromagnetic-mode passband.

13 Claims, 5 Drawing Sheets