Abstract: A radio-frequency (RF) splitter is provided. The RF splitter includes a common branch node configured to transfer an RF signal, input from an input port, to at least one of first and second output ports, first and second branch nodes electrically connected between the common branch node and the first and second output ports, first and second series switches configured to control switching operations to electrically connect the common branch node and the first and second branch nodes to each other, first and second inductors electrically connected between the common branch node and the first and second branch nodes, a resistor electrically connected between the first and second branch nodes, and first and second shunt switches configured to control switching operations to electrically connect the first and second branch nodes and the resistor to each other.

Abstract: In an embodiment, a method for determining the phase shift between a first signal and a second signal includes: delivering the first signal to a first input of a 90° hybrid coupler; delivering the second signal to a second input of the 90° hybrid coupler; determining a first piece of information relating to a power of a first output signal delivered to a first output of the 90° hybrid coupler; determining a second piece of information relating to a power of a second output signal delivered to a second output of the coupler; and adjusting the phase of the second signal until obtaining a calibrated phase for which the first piece of information is substantially equal to the second piece of information, wherein the first and second signals have identical frequencies, and wherein the phase shift between the first signal and the second signal is equal to the calibrated phase.

Abstract: A signal transmission device has a multi-point wiring structure in which termination resistors are mounted on both ends of a cable, and a plurality of PCBs connected to the cable transmit a signal through the cable. The PCB of a host node includes: a connector connected to the cable; a transformer unit that is connected to the connector via a first PCB transmission line and insulates the connector; an RS 485 transceiver that is connected to the transformer unit via a second PCB transmission line and transmits the signal to the PCB of another node or receives the signal from the PCB of another node; and AC termination that is provided in at least one of the first PCB transmission line and the second PCB transmission line and suppresses resonance and antiresonance in a reflection frequency characteristic of noise.

Abstract: Provided is a substrate treatment apparatus including a process chamber, a supporting unit, a gas supplying unit, and a plasma generating unit. The plasma generating unit may include a power, a primary antenna connected to the power through a first line, a secondary antenna connected to the power through a second line diverging from the first line at a first junction, the primary and secondary antennas being connected in parallel to the power, a third reactance device connected to the power through a third line diverging from the second line at a second junction, the secondary antenna and the third reactance device being connected in parallel to the power, and a variable reactance installed on the second line between the second junction and the secondary antenna.

Abstract: A multiport splitter with a circuit that is less costly, smaller, impedance matched on all ports, provides 9.54 dB isolation between neighboring ports, and is balanced as compared to the current typical implementations. The present disclosure may further provide a single multiport splitter that may be increased to any suitable number of output ports without the need for cascading multiple splitters and/or couplers together in a single device.

Abstract: The present disclosure relates to a transmission apparatus, including at least one first RF signal connection for an RF signal having a first phase, a ring coupler having a plurality of antenna connections for coupling a plurality of antennas in the first RF signal connection, wherein the ring coupler is configured to cause, at each of different antenna connections of the ring coupler, a constructive superposition of components of the RF signal that propagate from the first RF signal connection to the respective antenna connections in different directions in the ring coupler, wherein RF signals having different phases are obtained at the different antenna connections.

Abstract: A magnet-less multi-port ring combiner comprises a set of ports extending from the circumference of the magnet-less multi-port ring combiner. The set of ports are positioned at ¼ increments around the circumference of the magnet-less multi-port ring combiner. The set of ports comprise a first input port configured to receive a first input signal and a second input port configured to receive a second input signal, wherein the first input signal is 180° out-of-phase with the second input signal. The N-way magnet-less multi-port combiner comprises more than four ports.

Abstract: A power divider includes two transmission lines (TLs), two capacitors and a resistor. Each TL has a first terminal, a second terminal, and a length that is 0.07 to 0.12 times an operation wavelength in the power divider. The TLs establish electromagnetic coupling therebetween. The first terminals of the TLs are connected together, and are to receive an input signal. One of the capacitors is connected to a common node of the TLs. The other capacitor and the resistor are connected in parallel between the second terminals of the TLs. The second terminals of the TLs are to respectively provide two output signals which are in-phase, and each of which has a frequency equal to that of the input signal.

Abstract: An identification circuit for a CATV plug-in fixed attenuator is disclosed. The disclosed identification circuit may include an attenuator, a power supply module to supply power, a detection module to detect an output divided voltage value, and a microcontroller unit (MCU) identification module to determine an attenuation value of the CATV plug-in fixed attenuator based on the detected divided voltage value. The power supply module is connected to an input terminal of the plug-in fixed attenuator. The detection module is connected to an output terminal of the plug-in fixed attenuator and to the MCU identification module. With the disclosed embodiments, attenuation parameters can be determined remotely and failures on the line can be located.

Abstract: A power combiner/divider circuit can be structured having a base structure with the addition of an odd-mode capacitor and a low pass network at an end of the base structure or structured having a base structure with the addition of an inductor and a high pass network at an end of the base structure. The power combiner/divider circuit can be implemented as a port coupled to multiple ports with low pass networks or high pass networks arranged at the ends of paths to the multiple ports. In embodiments using low pass base structures or low pass networks coupled to the base structures, inductors in such low pass sections can be positively coupled on a pair-wise basis.

Abstract: A cable television apparatus improving high frequency characteristics includes a first connector and a first choke. The first connector is electrically connected to an input coaxial cable or an output coaxial cable. The first choke is electrically connected to the first connector. The first connector includes a first signal transmission unit. The first choke is used to block a cable television signal. The first choke allows a first current flowing through the first choke. The first current is greater than or equal to 10 amperes. The first choke is directly touched the first signal transmission unit, or a connection path length between the first signal transmission unit and a pin of the first choke is less than 5 millimeters.

Abstract: A semiconductor apparatus includes: an insulating substrate including an insulating layer having first and second main surfaces, a metal plate on the first main surface, and first to fourth conductors on the second main surface; a semiconductor device including a rear electrode electrically connected to the first conductor and a front electrode electrically connected to the second conductor; a temperature detection device including a first electrode electrically connected to the third conductor and a second electrode electrically connected to the fourth conductor; a first terminal electrically connected to the third conductor; a second terminal positioned so as to be wire-connectable to the fourth conductor; and a third terminal electrically connected to the second conductor, wherein the fourth conductor is positioned so as to be wire-connectable to the second conductor.

Abstract: Provided is a magnetoresistance effect device that functions as a high frequency device such as a high frequency filter or the like. The magnetoresistance effect device includes a magnetoresistance effect element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, a first signal line configured to generate a high frequency magnetic field as a high frequency current flows, a direct current application terminal to which a power supply is able to be connected to cause a direct current to flow to the magnetoresistance effect element in a lamination direction, and an independent magnetic body configured to receive a high frequency magnetic field generated in the first signal line to oscillate magnetization and apply a magnetic field generated through the magnetization to the magnetoresistance effect element.

Abstract: A three-piece electronics enclosure may be provided. The electronics enclosure may comprise a back housing, a lid, and a center frame. The back housing may comprise back housing heat sinks on an exterior of the back housing and back housing circuitry disposed in an interior of the back housing. The lid may comprise lid heat sinks on an exterior of the lid and lid circuitry disposed in an interior of the lid. The center frame may be disposed between the back housing and the lid. The center frame may comprise a plurality of input/output (I/O) ports comprising a first I/O port and a second I/O port. At least one of the plurality of I/O ports may provide power to the back housing circuitry and the lid circuitry. The center frame may further comprise a power bypass that passes power between the first I/O port and the second I/O port.

Abstract: A modular electromagnetic antenna assembly configured for securement to a structure is provided. The assembly includes an antenna, a radio, and a base. The base has a bracket securable to the structure and the base has at least one feed. The radio and base together form a waveguide that transmits radio waves between the radio and the antenna. The radio is removably secured to the base so as to form a removable mechanical connection to the base and a removable communication connection with the at least one feed through the base.

Abstract: A communications receiver. One example embodiment is a system-in-package (SIP) device, which includes a three-dimensional interposer, a first bandpass filter integrated into the three-dimensional interposer, a first integrated circuit chip on the three-dimensional interposer, a second integrated circuit chip on the three-dimensional interposer, a second bandpass filter integrated into the three-dimensional interposer, and a third bandpass filter integrated into the three-dimensional interposer. The first integrated circuit chip includes a balanced amplifier that receives a first filtered signal and suppress distortion products. The second integrated circuit chip includes a first mixer and a second mixer. The first mixer receives an output of the balanced amplifier and mixes the output with a first oscillator signal. The second bandpass filter receives an output from the first mixer and generates a second filtered signal.

Abstract: A power amplifier module includes a combining circuit including a combiner. The combining circuit further includes a first inductor connected in series between an output terminal of a first amplifier and the combiner, a second inductor connected in series between an output terminal of a second amplifier and the combiner, and a second capacitor having an end connected to the combiner and another end grounded. A phase of a third signal from the output terminal of the first amplifier to the second amplifier through the combiner is delayed by about 45 degrees in the first inductor and the second capacitor, and is delayed by about 45 degrees in the second inductor and the second capacitor. A phase of the third signal from the output terminal of the first amplifier to the second amplifier through the first capacitor is advanced by about 90 degrees.

Abstract: A modular passive RF apparatus includes a passive RF portal and a passive RF expansion module configured to be removably coupled with the passive RF portal. A male connector is configured to extend from a top surface of the passive RF portal, and a female connector is configured to extend from the first end wall of the passive RF expansion portal. The female connector is configured to slidingly engage the male connector in a direction parallel to the top surface of the passive RF portal in order to mechanically couple the passive RF expansion module with the passive RF portal, and the male connector is configured to prevent the female connector from being removed from the male connector in a direction perpendicular to the top surface of the passive RF portal.

Abstract: A filter device includes a filter (22A) connected to a common terminal (110) and having a first characteristic, a variable filter (22B) connected to the common terminal (110) and capable of changing a characteristic to one of a second characteristic and a third characteristic, and a switch (23). In the second characteristic, a second pass band including an overlapping band in which the second pass band and an attenuation band of the filter (22A) partially overlap in frequency is defined. Insertion loss within the overlapping band for the third characteristic is greater than insertion loss within the overlapping band for the second characteristic. When the filter (22A) is selected by the switch (23), the characteristic of the variable filter (22B) is set to the third characteristic.

Abstract: A wiring board includes couplers and external connection terminals including a first terminal group including a first antenna terminal and a first monitor terminal respectively connected to an output terminal and a coupler terminal of a coupler, and a first spacer terminal between the first antenna terminal and the first monitor terminal, and a second terminal group including a second antenna terminal and a second monitor terminal respectively connected to an output terminal and a coupler terminal of a coupler, and a second spacer terminal between the second antenna terminal and the second monitor terminal.

Abstract: Provided is a magnetoresistance effect device that functions as a high frequency device such as a high frequency filter or the like. The magnetoresistance effect device includes a magnetoresistance effect element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, a first signal line configured to generate a high frequency magnetic field as a high frequency current flows, a direct current application terminal to which a power supply is able to be connected to cause a direct current to flow to the magnetoresistance effect element in a lamination direction, and an independent magnetic body configured to receive a high frequency magnetic field generated in the first signal line to oscillate magnetization and apply a magnetic field generated through the magnetization to the magnetoresistance effect element.

Abstract: Radio frequency subscriber drop units include a housing having an input port and an output port and a printed circuit board mounted in an interior of the housing. The printed circuit board includes a dielectric layer, a wiring layer that includes conductive wirings that comprise at least part of a communications path between the input port and the output port that is on a first face of the dielectric layer, and a ground plane layer that includes a conductive ground plane that is on a second face of the dielectric layer.

Abstract: Systems, methods, and devices are provided to efficiently share an antenna between multiple communication systems and allow for the communication systems to be simultaneously connected to the antenna with less attenuation and/or no fluctuation in signal strength. Communication circuitry may include an antenna that transmits and receives electromagnetic radiation. The communication circuitry may also include an antenna port that provides primary access to the antenna with a first attenuation via an antenna port input. Additionally, the communication circuitry may include a coupler attached to the antenna port. The coupler may provide secondary access to the antenna with a second attenuation.

Abstract: The present invention increases the degree of freedom in layout of parts possessed by an electronic apparatus. A lower cover (50) has a first engaging section (53A). An inner part (B) has a first edge section (S1) which is located under the first engaging section (53A) and which overlaps with the first engaging section (53A) in the vertical direction. The inner part (B) has a guide section (31) located below the first edge section (S1). The guide section (31) is formed such that when the lower cover (50) and the inner part (B) are combined together in the vertical direction, the guide section (31) comes into contact with a right wall section (52B) of the lower cover (50) and pushes the right wall section (52B) rightward so as to cause the first engaging section (53A) to move rightward beyond the first edge section (S1).

Abstract: A resistance-type splitting apparatus includes a transformer and a resistor distribution circuit. The resistor distribution circuit is electrically connected to the transformer. The resistor distribution circuit includes a plurality of distribution resistors. The distribution resistors are electrically connected to the transformer. The distribution resistors of the resistor distribution circuit are arranged as a radial pattern. The transformer receives a cable television signal. After the transformer receives the cable television signal, the transformer distributes the cable television signal through the distribution resistors. A transformer turns ratio of the transformer is adjusted to perform an impedance matching with the distribution resistors of the resistor distribution circuit.

Abstract: Provided is a divider capable of accurately evaluating an object to be measured without being affected by impedance of a terminal to be measured of the object to be measured, and a signal generation system. There is provided a divider including an input terminal, a plurality of output terminals, a distribution unit that distributes a high frequency signal input to the input terminal and outputs signals obtained by the distribution, and a plurality of reflected wave blocking units that are respectively connected to a plurality of distribution unit outputs and attenuate reflected waves reflected by sides of the plurality of output terminals. The distribution unit includes the plurality of distribution unit outputs and outputs the high frequency signal distributed from the plurality of distribution unit outputs. Outputs from the plurality of reflected wave blocking units are output from the plurality of output terminals.

Abstract: There is provided a cable network device comprising an input associated with a plurality of outputs, wherein each output is connected to a respective microstrip directional coupler and each microstrip directional coupler is connected to at least one of the other microstrip directional couplers. The microstrip directional couplers form a series of microstrip directional couplers, with a last microstrip directional coupler in the series having its output port terminated by a resistive element. An isolated port of each microstrip directional coupler is in electrical communication with the upstream path.

Abstract: A power dividing circuit includes an input port, a first microstrip line, a first transmission subcircuit, a second transmission subcircuit, and a matching element. The first transmission subcircuit is coupled to a first microstrip line first end, and the first transmission subcircuit includes a first output port and a first resonance unit. The second transmission subcircuit is coupled to a first microstrip line second end, and the second transmission subcircuit includes a second output port and a second resonance unit. The matching element is coupled between the first output port and the second output port, the matching element matches impedances between the first transmission subcircuit and the second transmission subcircuit. A power divider is also provided.

Abstract: A microwave receiver includes a magnetoresistive element to which a microwave is input, a magnetic field application unit, and a DC bias current application unit. The magnetoresistive element includes a free magnetic layer, a fixed magnetic layer, and a nonmagnetic spacer layer interposed between the free magnetic layer and the fixed magnetic layer. The magnetic field application unit applies a magnetic field to the free magnetic layer. The DC bias current application unit applies a DC bias current to the magnetoresistive element, and includes an input terminal. The DC bias current is made variable by adjusting a DC voltage that is applied to the DC bias current application unit via the input terminal.

Abstract: A phase shift circuit includes a 90° hybrid circuit, variable capacitors, a switch circuit, and a balun circuit. The 90° hybrid circuit includes a high-frequency signal input terminal and a high-frequency signal output terminal. The variable capacitors are respectively connected to between first and second variable capacitor connection terminals of the 90° hybrid circuit and the ground. The balun circuit includes an unbalanced signal input terminal and balanced signal output terminals formed by a pair of terminals. The switch circuit selects any one of the balanced signal output terminal and the balanced signal output terminal of the balun circuit and connects the selected terminal to the high-frequency signal input terminal to the 90° hybrid circuit.

Abstract: There is disclosed herein integrated circuitry, comprising a signal path connected to a connection pad, for connection to external circuitry; and a termination circuit connected between the signal path and a voltage reference, wherein the termination circuit comprises a resistor and an inductor. The resistor and the inductor are connected together so as to compensate for parasitic capacitance associated with the connection pad. The signal path may carry an output signal from high-speed circuitry such as digital-to-analog converter circuitry.

Abstract: A symmetrical input signal is converted into an asymmetrical output signal. A first conduction path and a second conduction path are arranged parallel to one another based on signal flow. The first conduction path and the second conduction path form a first stage and a second stage. The first conduction path includes a first high-pass element assigned to the first stage. The second conduction path includes a first low-pass element assigned to the first stage. The first conduction path and the second conduction path have a second high-pass element assigned to the second stage. The second conduction path includes a second low-pass element assigned to the second stage and arranged in a chain with the first low-pass element. Each high-pass element shifts the phase of a signal forward, and each low-pass element shifts the phase of a signal backward to generate the asymmetrical signal.

Abstract: A test system includes a single-channel signal generator configured to generate an autocorrelation test signal to be distributed to each of a plurality of RF channels of a device under test (DUT). A time offset network includes a plurality of time offset channels each corresponding to one of the plurality of RF channels of the DUT, and is configured to, in combination with the DUT, provide corresponding autocorrelation test signals each with a different time delay as respective RF channel test signals. A single-channel measurement instrument is configured to process a single-channel test signal, based upon a combination of the RF channel test signals, to independently measure at least one characteristic of each of the RF channels of the DUT. The time offset network may be configured to be coupled between the single-channel signal generator and the DUT. Or, the time offset network may be configured to be coupled between the DUT and the single-channel measurement instrument.

Abstract: An embodiment of an integrated stripline feed network for a linear antenna array comprises a power distribution network coupled to the linear antenna array; a feed signal input/output component coupled to the power distribution network; wherein the input/output component receives a feed signal and splits the feed signal for distributing to a plurality of antenna elements of the linear antenna array through the power distribution network. The integrated stripline feed network is configured to be integrated into a support body of the linear antenna array, wherein, the support body structurally supports the linear antenna array.

Abstract: Aspects of the subject disclosure may include, for example, identifying a device coupled to a transmission medium that obstructs a propagation of guided electromagnetic waves propagating on an outer surface of the transmission medium when the device is subjected to a liquid, and applying a material to a portion of the device to mitigate the obstruction. Other embodiments are disclosed.

Abstract: Power divider networks are provided that have Multimedia Over Coax Alliance (“MoCA”) bypass paths.

Abstract: Device and a method of forming an integrated circuit (IC) that offers protection against ESD in RE applications is disclosed. The device includes a transmission line (TL) coupled to a signal pad. The TL is a short circuited stub that is configured as an ESD protection device and as a band pass filter in dependence of a center frequency of the band pass filter. The TL is configured to pass through a signal in response to a frequency of the signal being within an allowable range of frequencies of the band pass filter. The TL functioning as an ESD protection device is configured to shunt the signal in response to the frequency being outside the allowable range. The IC may include an array of control switches that are operable to change an electrical length L of the TL. The center frequency is tunable by controlling the electrical length L.

Abstract: The present disclosure provides for a fabrication layout and design for transmission lines that are implemented as part of a differential Wilkinson power divider/combiner. The transmission lines are configured and arranged in a poly-loop line geometry. The poly-loop line geometry includes overlapping transmission lines to route differential signals within the differential Wilkinson power divider/combiner. The overlapping transmission lines each include a crossover region to route the differential signals. The crossover represents a spacing between the overlapping transmission lines that encompasses a magnetic flux of the overlapping transmission lines.

Abstract: A coupled inductor and a power converter includes at least two input ends, an output end, a common magnetic core, at least two first windings, and at least two second windings. The common magnetic core includes at least two magnetic cylinders, and the number of the at least two magnetic cylinders corresponds to the number of the at least two input ends; and one first winding and one second winding are twined in parallel on each cylinder among the at least two magnetic cylinders, and the first windings and the second windings on the at least two magnetic cylinders are mutually connected between the at least two input ends and the output end to form mutually coupled inductances and when currents that flow into the at least two input ends are equal, make the first winding and the second winding on each cylinder generate opposite magnetic potentials.

Abstract: An electronic device is disclosed that includes a power distribution network, a first resonant network, a second resonant network, and a third resonant network. The power distribution network is configured transmit a voltage. The first resonant network is coupled to a first terminal of the power distribution network, and is configured to provide a first electrostatic discharge (ESD) protection to the power distribution network. The second resonant network is coupled to a second terminal of the power distribution network, and is configured to provide a second ESD protection to the power distribution network. The third resonant network coupled between the first terminal and the second terminal of the power distribution network, and the first resonant network, the second resonant network, and the third resonant network are configured to filter an AC signal from the power distribution network.

Abstract: A radio frequency load for absorbing a radio frequency wave having a frequency in a predetermined frequency band and a wavelength comprises a waveguide with a portion having an opening for said radio frequency wave. In addition, the radio frequency load comprises at least one metal rod provided in said waveguide, said at least one metal rod having a length of one-half of said wavelength to damp said radio frequency wave.

Abstract: The invention discloses a balance filter formed from a combination of a first circuit and a second circuit, wherein both the first circuit and the second circuit have at least one through-hole via inductor. The balance filter is connected to an IC through a first terminal and a second terminal, wherein a power trace is disposed between the first circuit and the second circuit to deliver the power to the IC.

Abstract: An apparatus comprising a first power combiner/divider network and a second power combiner/divider network. The first power combiner/divider network splits a first electromagnetic signal into split signals that are connectable to signal processor(s). The second power combiner/divider network combines processed signals into a second electromagnetic signal. The apparatus includes a three-dimensional coaxial microstructure.

Abstract: The embodiments disclose a method for creating a silicone encased flexible cable using manufacturing machinery including automatically arranging plural individual conduits, into custom grouped arrangements including electrical wiring, pneumatic tubing and fluid tubing, inserting the custom grouped arrangements including connectors and flexible silicone junction devices into a shaped silicone encasement extrusion apparatus, depositing a mixture of silicone and additives to the custom grouped arrangements encasement using the extrusion apparatus, customizing the mixture of silicone and additives to create differing characteristics of the custom grouped arrangements, using the extrusion apparatus to create a singular encasement and to cure the singular encasement to a desired shape of the custom grouped arrangements and integrating one or more encased flexible junction box to the custom grouped arrangements, wherein the one or more flexible junction box contains at least one incoming and two outgoing conduit con

Abstract: When a power amplifier mounted in mobile communications equipment, such as a mobile-phone, is composed of a balanced amplifier, technology with which the loss of the electric power composition in a power combiner can be reduced is provided. According to the technical idea of the present embodiment, by dividing an isolation capacitor element into two capacitor elements with high symmetry and coupled in parallel, it is possible to make almost equal parasitic capacitance arising from these capacitor elements, even when the capacitor elements are formed as interlayer capacitor elements of the wiring substrate.

Abstract: A circuit includes first and second signal networks, a driver circuit, and a bypass circuit. The driver circuit generates a first signal based on a second signal during a normal mode. The second signal is received from the first signal network. The bypass circuit is coupled to the driver circuit to provide a third signal generated based on the first signal to the second signal network during the normal mode. The bypass circuit receives a fourth signal from the first signal network during a test mode. The bypass circuit generates a fifth signal based on the fourth signal. The fifth signal is provided to the second signal network during the test mode. The bypass circuit prevents the driver circuit from driving a signal to the second signal network during the test mode.

Abstract: A semiconductor device includes: a terminal configured to input a signal from a signal source; a receiver configured to receive the signal from the signal source through the terminal; and a terminal circuit configured to be coupled between the terminal and an input end of the receiver, and to suppress reflected wave caused by signal reflection at the receiver, wherein impedance of a wire line connecting the terminal and the input end of the receiver, and direct-current impedance of a resistance component included in the terminal circuit are set lower than impedance of an external wire line connected to the terminal.

Abstract: Techniques for adding WiFi capabilities to a region may include installing WiFi access points in a cable television (CATV) system. For easier installation of the WiFi access points, a WiFi access point extension devices may be integrated into existing taps in the CATV system. The WiFi extended taps are able to provide radio frequency (RF)/CATV signals to subscribers, provide power to the respectively integrated WiFi access point, and maintain power to the coaxial transmission line during installation. During installation, the WiFi access point extension devices can be integrated into the CATV outdoor distribution plant without having to splice into an existing coaxial transmission line. The multiplicity of existing tap locations in CATV distribution plants makes the positioning of new wireless access points extremely versatile for the cable provider.

Abstract: A printed circuit board includes signal transmitting units that transmit signals, signal receiving units that receive signals, and a plurality of signal lines that connect the signal transmitting units and the signal receiving units. A resistor having a value Rp [?] of resistance with a first tolerance is provided between two signal lines that are adjacent to each other. In addition, a capacitor element that is connected in series to the resistor and that has a value Cp [F] of capacitance with a second tolerance is also connected between the two signal lines. In relation to the rise time tr [s] of the signals output from the signal transmitting units, the value Rp of resistance of the resistor and the value Cp of capacitance of the capacitor element are set such that an expression (Cp×Rp)×0.9?tr/3?(Cp×Rp)×1.1 is satisfied.

Abstract: Radio frequency subscriber drop units include a housing having an input port and an output port and a printed circuit board mounted in an interior of the housing. The printed circuit board includes a dielectric layer, a wiring layer that includes conductive wirings that comprise at least part of a communications path between the input port and the output port that is on a first face of the dielectric layer, and a ground plane layer that includes a conductive ground plane that is on a second face of the dielectric layer.