Abstract: An exhaust gas after-treatment system includes at least first and second substrates. The first substrate has a first region and a second region circumferentially surrounding the first region. The first region of the first substrate has a higher average cell density than the average cell density of the second substrate. The system can also include at least a third substrate.

Abstract: An exhaust gas after-treatment system includes at least first and second substrates. The first substrate has a first region and a second region circumferentially surrounding the first region. The first region of the first substrate has a higher average cell density than the average cell density of the second substrate. The system can also include at least a third substrate.

Abstract: In one aspect, the invention is the system for assessing a navigation augmentation environment. The system includes a reference station for receiving messages from a satellite. The reference station has a known position. The system also includes a simulator for simulating an augmentation system by determining corrections based on the messages received and the known position of the reference station. The system further includes a monitoring system to render the corrections to a user in a form enabling determination of the usability of the augmentation system in the navigation augmentation environment.

Abstract: A monoblock ceramic triplexer for connection to an antenna, a transmitter, a receiver and a GPS receiver is described. The triplexer includes a solid, monolithic core of dielectric material defining a plurality of through-holes extending between top and bottom surfaces. The surfaces of the core present a pattern of metallized and unmetallized areas including a relatively expansive metallized area, a transmitter coupling area, first and second receiver coupling areas spaced, an antenna coupling metallized area and an unmetallized area circumscribing at least one of the openings on the top surface. The antenna coupling metallized area includes a top surface extension towards the first receiver coupling area, and the expanded metallized area includes a top surface extension between adjacent resonator through-holes.

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 non-adjacent 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.

Abstract: A ceramic filter (100) with integrated harmonic response suppression has a ceramic monolithic block filter having a predetermined passband defined by tuned resonators located between an input and an output (116); and at least one of a harmonic trap filter, a lowpass filter and a lowpass microstrip filter, each having an inductive and a capacitive component. This is achievable with a design which incorporates an integrated harmonic response suppression filter directly in or on the dielectric ceramic monolithic block. This can result in a substantial savings in space, cost, and part count in an electronic telecommunications device.

Abstract: A ceramic waveguide filter made from a monolithic block of dielectric ceramic material which has longitudinally spaced resonators is described. Resonant structures having a grounded portion and ungrounded portion, each of the resonant structures being inductively coupled at the ungrounded portion describe the electrical schematic which corresponds to the waveguide filter. The positioning of the input and output on the block of dielectric ceramic material define a passband and also create a shunt resonant section. The shunt resonant section is associated with a shunt zero in the electrical schematic of the waveguide filter. Finally, the dielectric block of ceramic is mostly coated with an electrically conductive coating material with the exception of an uncoated area immediately surrounding the input and output.

Abstract: A bandstop filter module (200) with a shunt zero is provided. The module (200) contains a circuit substrate (202) with input and output pads and transmission lines (208). The module (200) also contains at least one dielectric monolithic block (210) mounted to the circuit substrate (202) having a plurality of metallized through holes defining resonators (224) and guard holes (226). All surfaces of the dielectric monolithic block (210) are substantially covered with a conductive material with the exception that the top surface (212) is selectively metallized providing an unshorted metallization pattern (228) relative to a ground plane in proximity to the guard holes (226). The guard holes (226) and the unshorted metallization pattern (228) provide a shunt zero in a frequency response curve of the module (200). The module also contains means for coupling each of the resonators (224) with the transmission lines (208) on the circuit substrate (202).

Abstract: A ceramic filter (100) is disclosed. The filter (100) has a filter body comprising a dielectric material having a plurality of surfaces with each surface having a plurality of metallized through holes extending through the dielectric material defining a first series of resonators (102) in a first plane and a plurality of second metallized through holes in a different plane and extending transversely with relation to the first, defining a second series of resonators (104). The filter (100) also has a metallization layer substantially coating all surfaces of the filter (100) with the exception that a portion of the surface surrounding each resonator is left unmetallized, and a coupling structure (108) for coupling electrical signals into and out of filter (100).

Abstract: A multi-filter device comprising a ceramic block (10) having at least two filters A and B. Both filters A and B include a notch (11 and 13, respectively) formed on one side of the ceramic block (10), such that these notches are flanked by ceramic block material extensions (32). So configured, coarse tuning of the ceramic block (10) can be accomplished through use of existing double-sided lap techniques, yet constant parameter alteration for both filters will be maintained during the milling process.

Abstract: Ceramic block filters can be constructed to have non-symmetrical, i.e. unequal, input and output impedances. These filters can be used to eliminate impedance matching networks in radio communications devices. These impedance matching networks (22, 14) are precluded when the input and/or output of a ceramic block filter (100) is controlled by appropriate selection of the physical parameters of the block to achieve a direct impedance match between an adjacent circuit element and subsequent signal processing stages in the device.

Abstract: A multi-stage ceramic bandstop filter electrically isolates coupling between stages in a monolithic block of ceramic material (21) by including holes (32 and 36) between the resonator stages (30, 34, and 38) that are shorted at both the top and the bottom ends, that are coated with conductive material and that behave as electrical shields between the succeeding resonator stages electrically isolating and reducing signal coupling between stages. Isolation between stages is also provided by impedance inverting lengths of transmission line (50 and 52) that coupled the stages together.

Abstract: In those monolithic ceramic filters that require resonator stages formed within a block of dielectric material to be electrically coupled together through discrete components, namely wires (44 and 46), a substantial space savings as well as improved electrical and mechanical performance can be realized by mounting the wires (44 and 46) within de-coupling cavities (36 and 40) when such de-coupling cavities are available and properly positioned with respect to the other resonator elements in the filter.

Abstract: Precise concentric alignment of the coolant, plasma and sample gas tubes d in conventional ICPs is an operationally important factor often achieved by fused arrangements which effectively preclude dismountability for maintenance and repair. Spacer rings slip-fitted into the coolant and plasma passages provide support for the concentric arrangement and also permit dismountability. Each ring is slotted to direct coolant and plasma gases and improve their intended functions. One ring spans the plasma tube and has a number of vertically-directed peripheral slots producing a laminar plasma gas flow. The other ring spans the coolant passage and has a pair of threads cut at spaced intervals to spiral the coolant gas and improve its heat transfer function. A separable base member supports the concentric lower ends of the tubes.