Abstract: A coaxial cable connector having a stopper in a main body for supporting the circumference of the coaxial cable and preventing the coaxial cable from falling out. The stopper is a ring-shaped fastening portion provided in the main body and whose central axis is the same as that of the main body, and a supporting portion which protrudes from the fastening portion in the direction of the central axis of the main body. A rotation-stopping means constituted by a strip-shaped projection is provided on at least an inner surface of the main body to engage the circumference of the coaxial cable. When an end of the coaxial cable is inserted into the main body from behind, the stopper prevents the fall-out of the coaxial cable because the supporting portion supports the circumference of the coaxial cable, and the strip-shaped projection prevents rotation of the coaxial cable.

Abstract: A coaxial cable connector having a stopper in a main body for supporting the circumference of the coaxial cable and preventing the coaxial cable from falling out. The stopper is a ring-shaped fastening portion provided in the main body and whose central axis is the same as that of the main body, and a supporting portion which protrudes from the fastening portion in the direction of the central axis of the main body. A rotation-stopping means constituted by a strip-shaped projection is provided on at least an inner surface of the main body to engage the circumference of the coaxial cable. When an end of the coaxial cable is inserted into the main body from behind, the stopper prevents the fall-out of the coaxial cable because the supporting portion supports the circumference of the coaxial cable, and the strip-shaped projection prevents rotation of the coaxial cable.

Abstract: An external noise intrusion prevention device preventing intrusion of external noise into a central conductor of a trunk cable in an up signal frequency band is provided. A first filter circuit 3 letting a signal in frequencies of 54 MHz or higher pass is provided between an input terminal 1 and an output terminal 2. A front filter circuit 4a and a rear filter circuit 4b, which constitute a second filter circuit 4, are provided on both ends of the external noise intrusion prevention device, respectively. A noise elimination circuit 6 formed by cascading two connection transformers 6a and 6b is also provided. The two connection transformers 6a and 6b are connected to each other while being arranged in a line symmetrical manner.

Abstract: The invention provides a connector for coaxial cable which prevents a fall-out of the coaxial cable and has a release function. A sleeve 6 for penetrating between the inner insulator 7b and the outer conductor 7c of the coaxial cable 7, a stopper 3 for preventing the fall-out the coaxial cable 7, and a releaser 5 for releasing the stopper's locking force of the coaxial cable 7 are provided within the main body of the connector 1 to which the coaxial cable is inserted. The stopper 3 has elastic property in diameter, and an inner peripheral portion of the distal end thereof serves as the supporting portion 3a for the coaxial cable and the outer peripheral portion of the distal end thereof serves as the fastening portion 3b for the stopper, hence to support the coaxial cable 7 and prevent the fall-out of the same.

Abstract: A two-staged coupling transformer comprised of an up-stream coupling transformer and a down-stream coupling transformer are successively provided between an input terminal and an output terminal, wherein respective primary windings are connected to the input side while secondary windings are connected to the output side. The up-stream coupling transformer and the down-stream coupling transformer are set to be of identical turns ratios and are connected by respectively converting each other.

Abstract: The present invention provides a circuit board, which can reduce a conduction loss and generate no trouble in electric/electronic apparatuses in the case of being mounted to electric/electronic apparatuses adapting a high frequency current. A circuit board 1 is formed a manner that a copper foil layer 2 and a copper layer 3 are laminated on a base material 5 made of polytetrafluoroethylene so as to form a predetermined circuit, and further, a tin plating layer 4 is laminated on these copper layers.

Abstract: An external noise intrusion prevention device preventing intrusion of external noise into a central conductor of a trunk cable in an up signal frequency band is provided. A first filter circuit 3 letting a signal in frequencies of 54 MHz or higher pass is provided between an input terminal 1 and an output terminal 2. A front filter circuit 4a and a rear filter circuit 4b, which constitute a second filter circuit 4, are provided on both ends of the external noise intrusion prevention device, respectively. A noise elimination circuit 6 formed by cascading two connection transformers 6a and 6b is also provided. The two connection transformers 6a and 6b are connected to each other while being arranged in a line symmetrical manner.

Abstract: A coaxial cable connector for mounting to an end portion of a coaxial cable (20) including a braided conductor (7) and a laminate foil (6) provided inside the braided conductor (7) and having a center conductor. The coaxial cable connector comprises a cylindrical connector main body (30) inserted between the braided conductor (7) and the laminate foil (6), a connective cylinder (2) rotatably supported to a proximal portion of the connector main body (30) so as to be engaged with an outer conductor of a mating connector to be connected, and a clamp ring (3) for fixedly fastening an insertion member (11) of the connector main body (30) after being inserted into the coaxial cable (20). The cylindrical connector main body (30) may also be inserted between the braided conductor (7) and a protective coating (8) portion provided outside the braided conductor (7). Further, the connector main body (30) may comprise slots (41) at the insertion distal portion (11a).

Abstract: The invention provides a noise elimination device that can be installed easily on a coaxial cable and that can effectively eliminate noise from both the center conductor and the outer conductor. Coaxial connectors 2 and 3 are provided on both ends of a tube-shaped housing 1 made of an insulator, and a coil made by winding a coaxial cable of thin diameter is around an open magnetic ferrite core is disposed inside the housing 1 and connected to the connectors 2 and 3 at the two ends. The earth-side connector thickness of the outer conductor of the coaxial cable and the connector as well as all earth-side conductors, such as shield members 7 connecting the connectors with the outer conductors of the coaxial cable, is at least 0.1 mm.

Abstract: The present invention provides a coaxial cable connector, which can perform a connection excellent in a fixing force without an intrusion or radiation of noise.

Abstract: A series unit capable of easily changing over a undirectional state to/from a bidirectional state and easily judging which state the series unit is in, is provided. A high pass filter 9 and a changeover switch 5 are included, and an operating protrusion 5a of the changeover switch 5 is provided in a circular recess 10 of a panel 2 formed to surround an F-type terminal 4 provided on a front surface. A cylindrical adapter 6 inserted into the circular recess 10 is provided so as to operate the operating protrusion 5a. The adapter 6 has a notch 6a which is provided on one side portion of the adapter 6 and which does not press the operating protrusion 5a. By inserting the adapter 6 while rotating the adapter and changing an angle, a unidirectional state can be changed over to/from a bidirectional state. In addition, a mark 16a indicating a position of the operating protrusion 5a is provided on the panel 2 and a mark 15 indicating a notch position is provided on an end portion on a front surface of the adapter 6.

Abstract: A direction coupler makes it possible to freely select an input terminal and an output terminal thereof. A branch unit (6) containing a branching circuit (6a) is mounted so that the branch unit (6) can be rotated relative to a mother board (5), with a central portion of the branch unit (6) being a fulcrum. Relay terminals (11, 12, 13, 14) of the mother board (5) are provided at positions corresponding to an input terminal (15) and an output terminal (16) of the branch unit (6).

Abstract: A directional coupler makes it possible to switch the input terminal and the output terminal thereof in position. A branch unit (5) containing a branching circuit (5a) is mounted so that the branch unit (5) can be rotated relative to a mother board (4), with a central portion of the branch unit (5) being a fulcrum. An input terminal (12) and an output terminal (13) are provided at positions corresponding to relay terminals (10, 11) of the mother board 4.

Abstract: There is provided a distribution apparatus in which transmission losses at the connections between ends of transmission lines and input and output terminals of a mother board are reduced. These ends of the transmission lines are positioned on resin support pieces. A resin support piece (19) is provided at a dead end of each groove (6a) formed in a housing (1). An end portion of a metal rod (6b) is placed on the support piece (19). The end portion of the rod (6b) has a threaded hole (20) formed therethrough. The mother board (11) is provided with two first lands (22,23) each surrounding a screw hole (21). A screw (22a) is tightened in each threaded hole (20), which is part of a main line connection terminal (5b), thereby bringing the head of the screw (22a) into firm contact with the first land (22) and establishing an electrical connection between the first land (22) and the conductive rod (6b).

Abstract: A theft checking system that improves precision in detecting a tagged article. A transmission antenna (1) transmits a signal of a constant amplitude in which sine-wave sweep is made within a range of 7.4 MHz to 8.9 MHz at 140 Hz. A reception side is provided with a signal analyzing portion (9) that predicts from the occurrence timing of a signal received within the first half period of a period of the sweep, the occurrence timing of a signal to be received within the second half period, and that compares a received signal with the predicted timing and, if it is confirmed that the signals are in an opposite phase relationship, recognizes passage of the article.

Abstract: A distribution apparatus is provided which, if a short circuit occurs in a secondary line from a branch output terminal of the apparatus or in terminal equipment connected to the secondary line, stops supplying electric currents to the concerned branch output terminal. In the distribution apparatus, external taps (22) which serve as distribution output terminals are connected to a current passage network (26). A positive thermistor (27) is connected to each external tap (22) in the current passage network (26).