Abstract: The present invention includes a method of a low cost, reliable novel broadband inductor that can be used with a capacitor to form a broadband filter.

Abstract: The present invention includes a method of a low cost, reliable novel broadband inductor that can be used with a capacitor to form a broadband filter.

Abstract: The present invention includes a method of a low cost, reliable novel broadband inductor that can be used with a capacitor to form a broadband filter.

Abstract: A method of tuning the frequency of a waveguide filter including the step of removing dielectric material from one or both of the first and second opposed exterior side surfaces of the waveguide filter to cause a change in the center frequency of the waveguide filter. In one embodiment, dielectric material is removed from one or both of the first and second opposed exterior side surfaces of the waveguide filter in unequal amounts wherein the tuned waveguide filter includes first and second slits defined in the respective first and second opposed exterior side surfaces which extend unequal first and second distances into the body of the waveguide filter.

Abstract: A method of making a ceramic waveguide delay line includes the step of providing several slices or slabs of dielectric material, each including a layer of metal material applied to respective opposed side surfaces thereof. The slices are then fired in an oven to fuse the layers of metal material to the slices. The slices are then stacked together to form a core which is then dried and subsequently fired. An area of metal material is applied to the outer surface of the core. The core is subsequently dried and fired in an oven.

Abstract: A delay filter module comprising at least one dielectric boneblack ceramic band pass filter and a circuit for compensating/equalizing the signal delay produced by the delay filter. In one embodiment, the circuit is defined by a hybrid coupler defining at least two ports coupled to a dielectric ceramic reactive termination block defining at least a pair of reactive termination resonators and coupling capacitors. The delay can be adjusted by tuning the dielectric boneblack band pass filter and/or the reactive termination resonators and/or the coupling capacitors defined by the dielectric ceramic reactive termination block.

Abstract: A method of making a ceramic waveguide delay line includes the step of providing several slices or slabs of dielectric material, each including a layer of metal material applied to respective opposed side surfaces thereof. The slices are then fired in an oven to fuse the layers of metal material to the slices. The slices are then stacked together to form a core which is then dried and subsequently fired. An area of metal material is applied to the outer surface of the core. The core is subsequently dried and fired in an oven.

Abstract: A wireless telemetry system that leverages the ubiquitous Wi-Fi routers and public internet to communicate the level of propane in a tank to the propane distributor is disclosed. The system also allows the user of the fuel to monitor the level and modify the usage habits. Furthermore, the distributor can use the system to deliver the fuel efficiently. The system can also be used to monitor various utility meters for billing purposes wirelessly without the need to send personnel to the sites.

Abstract: A delay filter module comprising at least one dielectric monoblock ceramic bandpass filter and a circuit for compensating/equalizing the signal delay produced by the delay filter. In one embodiment, the circuit is defined by a hybrid coupler defining at least two ports coupled to a dielectric ceramic reactive termination block defining at least a pair of reactive termination resonators and coupling capacitors. The delay can be adjusted by tuning the dielectric monoblock bandpass filter and/or the reactive termination resonators and/or the coupling capacitors defined by the dielectric ceramic reactive termination block.

Abstract: A ceramic filter with a coplanar shield which has: a filter body (302) comprising a block of dielectric material having top (304), bottom (306) and side surfaces (308,310,312,314), and having a plurality of metallized through holes (316) extending from the top (304) to the bottom (306) surfaces defining resonators; a metallization layer substantially coating the bottom (306) and the side surfaces (306,310,312,314), and the top surface (304) having a metallized pattern thereon defining a top pattern; input-output pads (318); and a conductive shield (322) having standoff legs (324) which maintain the conductive shield at a predetermined height above the top pattern of the filter body, the standoff legs (324) are connected to a portion of the top pattern on the top surface of the filter at a desired distance from the side surface having the input-output pads.

Abstract: A high frequency ceramic waveguide bandpass filter (100) having: two or more waveguide resonators (102) stacked vertically, each adjacent waveguide resonator is coupled with a shunt capacitance, and includes: a plate of dielectric material having a top planar surface (108), a bottom planar surface (110), and four side surfaces (112, 114, 116 and 118); a metallized receptacle (120) on the planar surface (108) and the bottom planar surface (110), the metallized receptacles (120) defining capacitive probes; a metallization layer on substantially all the surfaces of the resonators (102) with the exception of an unmetallized area (124, 126) surrounding the capacitive probes; and the resonators (102) having a conductive interface adapted to electrically connect to an adjacent resonator.

Abstract: A ceramic filter (100) with a transmission zero is disclosed. The filter (100) includes a block of dielectric material having top (102), bottom (104), and side surfaces (106, 108, 110 and 112), and having two or more metallized through-holes extending from the top to the bottom surfaces (102, 104), defining approximately half wave long resonators. The surfaces are substantially covered with a conductive material defining a metallized layer, with the exception that the top surface (102) is substantially uncoated, and with the additional exception that the bottom surface (104) is also substantially uncoated defining a filter with an open circuit at both ends. The filter (100) also has an input and an output (118, 120) and a mechanism or slot for electrically isolating successive resonators, extending about halfway between the top (102) and bottom surface (104). A filter constructed as detailed above, can have a higher Q value and lower insertion loss.

Abstract: A method of tuning a duplex filter (500). First, the center frequency of at least one filter of a duplex filter (10) is measured (502). Next, the difference between the measured center frequency and a desired center frequency is determined (504). And, third the duplex filter is tuned (506) by selectively removing a substantially planar layer of dielectric material for a top surface (14) of the filter (10), whereby the frequency characteristics are modified.

Abstract: A ceramic duplex filter is provided. The duplex filter (10) has a filter body (12) of a dielectric material, and has a top (14), bottom (16) and side surfaces (18, 20, 22, and 24) with through-holes extending from the top (14) to the bottom surface (16). Receptacles are positioned adjacent to the top surface (14) with a conductive material therein. The surfaces (16, 18, 20, 22 and 24) are substantially covered with a conductive material defining a metallized layer (25), with the exception that the top surface (14) is substantially unmetallized. The receptacles include a conductive layer of material to define a certain capacitance. And, coupling devices (94, 96 and 98) for coupling signals into and out of the duplex filter (10) are provided. Shunt, series and coupling capacitors are strategically positioned adjacent to the top surface (14), which help to facilitate tuning of the filter.

Abstract: A ceramic bandpass filter (10) that has transmission zeroes above the passband is accomplished without using the top patterning by a block structure that includes a localized mesa (26) formed at the top end of the block that provides increased capacitive coupling between the open circuits and the resonators (30, 32, and 34). This increased top end capacitance provided by the mesa (26) can provide high end or high side transmission zeroes to the characteristic transfer function of the filter.

Abstract: A dielectric block filter having a self aligning, top and shield is provided. Recesses are formed in at least one side of the block, which recess is dimensioned to accept a mating tab or side of a shield that substantially encloses the top end of the filter. The recess in the block in combination with the appropriately shaped tab produces the overall height of the filter and simplifies manufacturing by eliminating the need to hold or affix the shield to otherwise smooth sides of the block.