Abstract:
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator providing a strip line resonator in the inside layer of a multilayer substrate and less in the dispersion of oscillation frequency by humidity. SOLUTION: Polytetrafluoroethylene is used as the core material of the multilayer substrate. Since the polytetrafluoroethylene has smaller water absorptivity than glass epoxy, the change of dielectricity to the change of humidity. As a result, also the change of the resonant frequency of the strip line resonator formed in the inside layer of the multilayer substrate is small, as a result, also the change of oscillation frequency becomes small. Then, since the change of the oscillation frequency is small, control voltage sensitivity can be reduced, and thus, C/N characteristics is improved. Then, since also the property of the polytetrafluoroethylene material itself is small in dielectric loss comparing with the glass epoxy and also specific dielectricity is small, the Q of resonant system is improved, and thereby, the C/N characteristics is improved too.
Abstract:
A clip for surface-mounting a coupled-dual resonator crystal to a circuit board includes an elongated housing shaped complementary to the housing of the crystal and having an opening along a side for receiving the crystal. A tab spaces first and second shielding portions which overlie the end of the crystal housing. A first shield portion engages the middle ground terminal of the crystal shielding the input and output terminals, while the second shield extends from the first shield to overlie the output terminal, likewise shielding it from the input terminal. Distal portions of the input, output and common terminals, together with pads at the opposite end of the clip, mount the clip mechanically to the surface of a circuit board.
Abstract:
An elongate opening is formed in the substrate of the printed circuit, from which project lugs formed in the copper layer on the substrate. The lugs are shaped to form a supporting cradle for the resonator which is soldered or stuck to the lugs with its base in contact with the end of the opening. Two conductive tracks extend across the opening to two resonator terminals, in the form of pins, to which they are soldered.
Abstract:
Various embodiments of an interconnect device and modules and systems that utilize such interconnect device are disclosed. In one or more embodiments, the interconnect device can include a printed circuit board (PCB). The PCB can include a substrate forming a resiliently deflectable element, a conductive material disposed on the substrate, and an electrical contact disposed on the resiliently deflectable element and electrically coupled to the conductive material. The interconnect device can also include a connector that includes a connecting pin configured to electrically couple with the electrical contact of the resiliently deflectable element of the PCB and cause the resiliently deflectable element to deflect when the element contacts the connecting pin.
Abstract:
A resonator/filter (100) adapted for direct surface mounting to the surface of a printed circuit board. The resonator/filter comprises a block of dielectric material (110) including at least one resonator through-hole (101-104) extending therethrough and respective top (112), bottom (113) and side surfaces (114-117) defining respective regions of dielectric material covered with conductive material. The top block surface defines at least a first conductive region. A second conductive region on the bottom surface of the block defines an input/output contact which allows the filter to be mounted on the board with the bottom filter surface seated thereon, thus providing a direct ground contact between the board and the resonator through-hole for improved attenuation performance particularly at higher frequencies. A plurality of transmission line embodiments (131, 156) electrically interconnect the first and second conductive regions.
Abstract:
A wiring board (1) has an insulation base plate (11), and a plurality of electrodes (12) provided adjacent to each other in plan view on the insulation base plate (11), the electrodes (12) have an opening (12b) in the outer periphery and a slit (12a) oriented from the outer periphery to the interior, and, among two electrodes (12) adjacent to each other, the slit (12a) in one electrode (12) has a central line (12c) intersecting the outer periphery of the other electrode (12).