Abstract: The present invention discloses a miniature high directivity multi-band coupled-line coupler for RF power amplifier module application. The coupler utilizes a three-coupled-line structure, with a first RF line designated coupled line for the GSM 900 MHZ band, a second RF line designated coupled line for the DCS/PCS 1800/1900 MHZ band, and a common coupled line. A first capacitor is connected between the center of the first line and the center of the common line and a second capacitor is connected between the center of the second line and the center of the common line. The coupler has a length considerably less than the length of a quarter wave length coupler while achieving directivity requirements for both GSM band and DCS/PCS band.

Abstract: The present invention provides a ninety degree coupler for a frequency range of 100 mHz to gigaHertz ranges and including a minimum number of components employing a four port device which receives an input signal and splits it between a transformer coil and another reactor and couples it to another port and splits it between the transformer and a capacitor, then cross-connecting to a capacitor where phase shift is created by the inductors and capacitors resulting in phase shift between the signal ports remaining at 90 degrees over a wide frequency band.

Abstract: The present invention provides a mechanism for supporting high digital bandwidth in a multi-drop bus system. A first device of the system is electrically coupled to a bus. Multiple receiving devices are coupled to the bus through associated electromagnetic couplers having coupling coefficients in a specified range. The geometries of the electromagnetic couplers are selected to reduce variations in the coupling coefficients with changes in the relative positions of the coupler components.

Abstract: In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in the compressing signal generating path a compressing signal, which keeps the peak-to-average-power ratio of the input signal below a predetermined value, is generated from the input signal. The compressing signal is combined by a power combiner with the input signal having passed through the linear signal transfer path.

Abstract: An electromagnetic (EM) coupler including a first transmission structure having a first geometry, and a second transmission structure having a second geometry and forming an EM coupler with the first transmission structure, the first and second geometries being selected to reduce sensitivity of EM coupling to relative positions of the first and second transmission structures is disclosed.

Abstract: An arrangement for broadband signal and/or energy transmission, between at least two units is disclosed. Said units may be displaced relative to each other along a track. Said arrangement comprises a first unit, which has a symmetrical open circuit arrangement with at least one reflection-free closed end, within which an electromagnetic wave can propagate and at least one second unit with a coupling unit for the coupling and/or decoupling of electrical signals. The invention is characterized in that at least one of the at least one second units has a directional coupler for the coupling and/or decoupling of signals.

Abstract: A cable television multi-tap system for forwarding signals to multiple customers from a main cable, and for receiving individual return signals from respective subscribers includes a printed circuit board secured to the inside face of the respective tap plates of a plurality of multi-taps, respectively, with each printed circuit board including at least first and second electrical receptacles for receiving a selected one of a plurality of first and second plug-in modules, respectively, said plurality of first plug-in modules providing different levels of directional coupling, respectively, and said plurality of second plug-in modules providing individually one or a combination of different levels of forward equalization, return path or backward equalization, cable simulation, high tap value filtering, high pass filtering, low pass filtering, band rejection, shunting, and noise filtering to optimize the signal quality of signals forwarded from the headend of the system to subscribers, and return signals from s

Abstract: An apparatus comprises a first device having one or more conductive areas to form a portion of an electromagnetic coupler and a socket to mount the first device relative to a second device having one or more conductive areas to form the electromagnetic coupler.

Abstract: In a printed board mounting method using a directional coupling bus for a high-speed data transfer, multi-bit data are transferred between nodes at a low cost. For this purpose, to transfer multi-bit data by directional coupling, a one-bit multi-coupling wiring network is vertically configured in a multilayered printed board. This minimizes the width of an area occupied by each bit along a wiring direction of the board to thereby implement a multi-bit configuration.

Abstract: A radio frequency (RF) coupler apparatus (312) suited for use in a multi-band wireless communication device (200), has a termination device (316) and couplers (314 and 315). Each of the couplers (314 and 315) has through-path coupling elements (318 and 320) and coupled-path coupling elements (319 and 321). Through-path coupling elements (318 and 320) pass a RF signal that is to be transmitted respective frequency bands (TX BAND 1, TX BAND 2) within which the device (200) operates. Coupled-path coupling elements (319 and 321) couple the RF signals passed by respective through-path coupling elements (318 and 320). The coupled-path coupling elements (319 and 321) and the termination device (316) are coupled in series, thereby permitting compatibilty with a RF power detector (313) that uses a single detection diode (322).

Abstract: A directional coupler that has a small package size and repeatable electrical characteristics. The directional coupler includes a low temperature co-fired ceramic (LTCC) substrate with several layers. Electrical components such as resistors and capacitors are integrated within the LTCC substrate. A transformer is attached to the upper surface of the LTCC substrate and is electrically connected to the resistors and capacitors. The LTCC substrate has electrically conductive vias extending therethrough. The vias are used to make electrical connections between the layers of the LTCC substrate.

Abstract: A directional coupler for detecting an output of a high frequency circuit module includes a main line and a sub-line overlapped with the main line with a dielectric material. The sub-line is set, in width, narrower than the main line and both side edges of the sub-line are allocated at the internal side of both side edges of the main line. Accordingly, the sub-line is surely provided opposed to the main line in the total width area and a signal current flowing into the main line can be detected in higher accuracy. Therefore, a wireless communication system for controlling an output of the high frequency circuit module by including such directional coupler assures stable communication.

Abstract: Disclosed herein is a microwave oven with a magnetic field detecting device. The microwave oven includes a magnetron for generating microwaves and a wave guide for guiding the microwaves to a cooking chamber. A detection opening is formed in one side of the wave guide to allow a magnetic field generated by standing waves formed in the wave guide to be discharged from the wave guide. The magnetic field detecting device is formed on a board mounted on the wave guide to detect the magnetic field discharged through the detection opening.

Abstract: Microwave semiconductor variable attenuation circuit includes a coupler, two series circuits of inductors and a plurality of means having controllable resistance. Each Inductor of the series circuits has a defined inductance, where one end of the series circuit is connected to a terminal of the coupler. Each of means having controllable resistance respectively being connected to a junction point between two respective inductors of the series circuit. All of means having controllable resistance are controlled on the basis of a common signal is provided at a single terminal. By the above features provided that inductors of defined inductance between the coupler and the means having controllable resistance (e.g. a transistor or diode), the total impedance of the attenuation circuit can be properly set and a performance degradation at high frequency can be avoided.

Abstract: Inner conductor formation holes having inner conductors formed on the inner walls thereof are formed in a dielectric block. Both of the ends of one of the inner conductors are open and led out as terminal electrodes which function as balanced ports. Both of the ends of another inner conductor are connected to an outer conductor to be grounded, and the center portion of the inner conductor between the ends is led out as a terminal electrode which functions as an unbalanced port. The circuit can also be realized with striplines or microstriplines on a dielectric substrate. Thus, a balanced-unbalanced converter having these terminal electrodes as balanced and unbalanced ports is formed.

Abstract: Input port 101 is connected to output port 102 via open-circuited stub 107, first transmission line 105 and open-circuited stub 108. Coupling port 103 is connected to isolation port 104 via second transmission line 106 in electromagnetic coupling with first transmission line 105. Open-circuited stubs 107 and 108 have a stub length corresponding to ¼ wavelength in desired stop frequency. It is thereby possible to provide a directional coupler and directional coupling method enabling the miniaturization and harmonic spurious suppression effect with a low loss and with excellence even in microwave/millimeter wave band.

Abstract: Disclosed herein is a multi-layer chip directional coupler. The multi-layer chip directional coupler has a first ground pattern, a coupling signal line, a main signal line, a second ground pattern, and a plurality of ports. The first ground pattern is formed on the upper surface of a first dielectric layer. The coupling signal line is formed of a conduction pattern on the upper surface of a second dielectric layer. The main signal line is formed of a conduction pattern on the upper surface of a third dielectric layer formed over the second dielectric layer. The second ground pattern formed on the upper surface of a fourth dielectric layer formed over the third dielectric layer. A plurality of ports is formed on the side surfaces of the first to fourth dielectric layers.

Abstract: A superregenerative circuit which is operable in a transmit mode and a receive mode of operation. A superregenerative oscillator and a single antenna are functional in both modes. To minimize any undesired RF energy which may be radiated during the receive mode of operation, the circuitry includes decoupling means connected between the antenna and the oscillator. During reception, the oscillator is periodically quenched, and received signals are recovered by circuitry which obtains, during unquenched periods, time samples indicative of the time required for the RF energy to build up to a predetermined level in the oscillator circuit.

Abstract: A load-insensitive circuit enables a global reference clock signal source of a synchronous multiprocessor system having a plurality of nodes to be “insensitive” with respect to the insertion or removal (“hot-swap”) of a load (such as a node) when the system is operational. The load insensitive clock source is provided through the use of a customized two-way passive radio frequency power splitter having an input port and two phase-matched output ports. A high degree of isolation is provided between clock signals delivered over the output ports when the input port of the splitter is properly terminated and embedded in a controlled impedance environment. Isolation is further enhanced by terminating each output port with a constant impedance comprising a precisely-matched, 50-ohm impedance load pad.

Abstract: A cable television multi-tap system for forwarding signals to multiple customers from a main cable, and for receiving individual return signals from respective subscribers includes a printed circuit board secured to the inside face of the respective tap plates of a plurality of multi-taps, respectively, with each printed circuit board including at least first and second electrical receptacles for receiving a selected one of a plurality of first and second plug-in modules, respectively, said plurality of first plug-in modules providing different levels of directional coupling, respectively, and said plurality of second plug-in modules providing individually one or a combination of different levels of forward equalization, return path or backward equalization, cable simulation, high tap value filtering, high pass filtering, low pass filtering, band rejection, shunting, and noise filtering to optimize the signal quality of signals forwarded from the headend of the system to subscribers, and return signals from s

Abstract: An R.F. antenna switch (102) for coupling either a high-loss port (112) or a low-loss port (114) to a common port (110) includes an unequal power splitter (104) with the high-loss port (112), the low-loss port (114), and the common port (110). The unequal power splitter (104) further has at least one high-loss path (120) coupled between the common port (110) and the high-loss port (112) and a low-loss path (122) coupled between the common port (110) and the low-loss port (114). The R.F. antenna switch (102) further comprises a switching element (106) having an input (106A) coupled to the low-loss port (114) and an output (106B) coupled to a terminating element (108). The low-loss port (114) is terminated with the characteristic impedance of the unequal power splitter (104) when the switching element (106) is switched on.

Abstract: An electromagnetic (EM) coupler including a first transmission structure having a first geometry, and a second transmission structure having a second geometry and forming an EM coupler with the first transmission structure, the first and second geometries being selected to reduce sensitivity of EM coupling to relative positions of the first and second transmission structures is disclosed.

Abstract: An amplifier (600) includes a first terminal (605) for receiving forward signals in a first frequency band and a second terminal (655) for receiving reverse signals in a second frequency band. A single gain block (630) is coupled between the first terminal (605) and the second terminal (655) for amplifying the forward signals and the reverse signals. The forward signals, after amplification, are provided to the second terminal (655) for transmission from the amplifier (600), and the reverse signals, after amplification, are provided to the first terminal (605) for transmission from the amplifier (600). In this manner, both forward and reverse signals, which are transmitted in separate frequency bands, can be amplified by a single gain block (630).

Abstract: An apparatus and method provide an adjustable phase and time delay to an input signal. The apparatus includes an inverting element and first and second variable capacitors. The inverting element has a first end serially coupled with the input signal and a second end. The first variable capacitor is coupled between the first end of the inverting element and first voltage. The second variable capacitor is coupled between the second end of the inverting element and a second voltage. The first and second variable capacitors are separately adjustable to controllably vary a phase shift and a delay of a reflection of the input signal. The first and second voltages may be at the same or different potentials. The input signal may be coupled to the inverting element through a directional coupler, such as a circulator.

Abstract: According to the configuration the present power splitter, it is possible to reduce the characteristic impedance of a transmission line constituting a directional coupler by setting the impedance of a first terminal pair constituted of an input port 7a and a second output port 7d of a 6-dB branch-line-shaped directional coupler 7 to a value smaller than a reference impedance Z0 (50 &OHgr; in general) and setting the impedance of a second terminal pair constituted of an isolation port 7b and a first output port 7c of the directional coupler 7 to Z0. Therefore, it is possible to increase the number of splits and reduce loss, as compared with conventional cases.

Abstract: The present invention relates to a data pulse receiver for receiving data signals propagating on a high speed data transmission medium, where the medium includes both data and clock channels. A hysteresis control signal is generated from the clock signal and it is used to discriminate against unwanted noise signals during the detection of data pulses conveyed by the data signal.

Abstract: A broadband signal tap includes a reversible directional coupler and a make-before-break signal continuity bridge. The electronic circuitry of the directional coupler is provided on a daughterboard that is removably connected to a motherboard in the tap. The removable daughterboard has a plurality of symmetrically arranged connection means and the motherboard has a plurality of symmetrically arranged connection points for accepting connections with the plurality of symmetrically arranged outputs on the daughterboard. The connections on the motherboard and on the daughterboard are physically and functionally symmetrical, thereby permitting the daughterboard to be reversed. The daughterboard is maintained in a housing. The housing has elongated fingers which, when pushed downward onto the motherboard, penetrate through retaining holes in motherboard, thereby retaining the housing on the motherboard.

Abstract: An AC signal is switched between two circuit branches using a transformer or at least one directional coupler as a coupling device. Electronically controlled switches shunt one of two terminals of the coupling device to AC ground. The input signal is propagated out of the non-shunted terminal to one of the two circuit branches. The electronically controlled switches may be relays, transistors, or diodes. Diodes prevent the AC signal from being shunted to AC ground when reverse biased and shunt the AC signal to AC ground when forward biased.

Abstract: A radio frequency combining system is disclosed that uses commercially available quadrature hybrid couplers configured in a unique manner to combine any radio frequency sources such as transmitters into a single load such as an antenna. The radio frequency combining system is bidirectional and can be used in the receive mode to combine the output of a receive antenna with outputs from an interference canceller to then supply received signals to a multiple receiver system.

Abstract: A clock generation system generates and distributes sinusoidal signals. Also, the clock lines are configured and shielded in a novel manner so as to provide the same overall propagation characteristics for the clock signals in all the lines, and to minimize the effects of cross-talk and electromagnetic interference.

Abstract: A low cost glass mount vehicle antenna system utilizes, in a preferred embodiment, an over-coupled quasi-TEM mode transmission line coupler having two simple stamped or printed plates stacked over an L shape internal ground plane. The two conductive plates are located on opposite sides of the glass. With proper open circuit terminations on two of the four coupler ports, the backwards and forward coupling signals are redirected/combined and are effectively fed diagonally between the other two ports, thereby achieving through-glass coupling. The over-coupling achieves this efficient through-glass coupling effect at two spaced-apart frequencies (e.g. 800 MHz and 1800 MHz). The coupler is of a low impedance type and can be used with a variety of collinear array and elevated-feed antennas. It features high efficiency, low backwards radiation, and mechanical simplicity.

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: The invention is a non-contact coupling system for use in interconnecting a large number of electronic modules to a main signal trace via non-contact couplers. A driver sends an electronic signal comprising pulses along the main signal trace. The couplers each have a track of conductive material substantially parallel to the main signal trace. The track of each succeeding coupler is longer than that of the preceding coupler. As a pulse travels from the driver alongside the track of the closest coupler, a pulse is induced therein, although part of the original pulse energy is lost. The remaining lower-energy pulse then couples onto the second-closest coupler but because of the longer parallel track, an induced pulse virtually as strong as the pulse imparted to the first coupler is produced. This phenomenon occurs at every coupler along the main signal trace, resulting in induced pulses that have a relatively low amplitude variation.

Abstract: A conducting housing (to be closed by a lid) for a coaxial cable distribution network has a common port and one of an aerial or pedestal port. A motherboard carries an RF circuit and a transfer switch. In one setting of the transfer switch the RF circuit connects a coaxial pin at the common port with a coaxial pin at the pedestal port. In the other setting the common port pin is connected to the aerial port pin. When the aerial port is used on a rectangular housing, a transmission line forms part of the RF circuit between the motherboard and the aerial port. The transmission is preferably a central conductor spaced over most of its length by air from an outer conductor in the form of an inverted U enclosing the central conductor on three sides. Preferably a ground plane on the back of the motherboard connects to the transmission line outer conductor to provide a path entry in the housing at both ends for ground currents generated by signals in the RF path.

Abstract: A directional coupler for r.f. power measurement utilizes a capacitive voltage divider connected to the center conductor of a length of transmission line. The output of the divider is connected to the input of a field effect transistor amplifier, which makes the divider essentially frequency independent over a wide frequency range. The outer conductor of the transmission line comprises two sections separated by a gap and connected to each other by an annular resistor permitting a current sample to be tapped. The annular resistor is disposed between two parallel circuit boards disposed in radial planes. Circuit components, including the field effect transistor amplifier are mounted on one of the boards. The output of the amplifier and the current sample are combined algebraically at a junction to provide a signal representing forward or reflected power in the transmission line.

Abstract: An electrically controllable impedance matching device for matching an impedance of a signal output from a signal generator in an RF (Radio Frequency) amplifier. The impedance matching device includes a 3-dB directional coupler having a coupling terminal, a through terminal, an isolation terminal being an output terminal, and an input terminal connected to the signal generator; a first phase shifter connected to the coupling terminal, for shifting a phase of the signal according to a control signal; a second phase shifter connected to the through terminal, for shifting the phase of the signal according to the control signal; and controller for generating the control signal.

Abstract: A radio frequency system includes a reflective diode linearizer. The reflective diode linearizer has a quadrature hybrid circuit with an input, an output, a first tuned port, and a second tuned port. Each of the tuned ports has a reflection circuit in electrical communication. Each reflection circuit includes a first Schottky diode having a cathode in electrical communication with the tuned port, a second Schottky diode having an anode in electrical communication with the tuned port, a first delay line having a first end in electrical communication with the tuned port, a second delay line having a first end in electrical communication with an anode of the first Schottky diode and also in electrical communication with a cathode of the second Schottky diode, and a radio frequency resistive element having a first end in electrical communication with a second end of the first delay line and a second end in electrical communication with a second end of the second delay line and with an electrical ground.

Abstract: A bus for high signal quality interconnections, comprising means for producing at least one common mode reflection, often for differential transmission line interconnections. Also, a bus for high signal quality interconnections further comprising means for under-damping the signal and/or reducing the common mode noise. In both cases the means are at least one impedance termination. To produce common mode reflections, there are non-contact couplers terminated by short and open circuits, which cause the reflections from via connectors and other like impedance discontinuities to be re-reflected in common mode so that they are rejected by a differential receiver. To produce under-damping of the signal and/or a reduction of the common mode noise, capacitive terminations are used. The under-damping of the signal sharpens in the falling edge of the coupler pulses.

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: A reflection reducing directional coupler provides an output signal from a coupled signal while reducing the effect of an input signal. The directional coupler provides circuitry to divide, phase delay and vectorially add signals to provide coherent output and coupled signals and reduce reflected signals. The directional coupler also provides the capability to input a calibration signal into a system while mininimizing the effect of the calibration signal on the output signal.

Abstract: A module for radio frequency signal circuits includes an electrically conductive housing. Coax connectors are secured to the rear face of the housing. A circuit board is contained within the interior spaced between sidewalls of the housing. A ground side of the circuit board includes a layer of electrically conductive material which is electrically connected to the housing. Coax cables extend within the interior of the housing from the coax connectors and between the ground side of the circuit board and an opposing sidewall. An opposite side of the circuit board contains circuit components inner connected with one another through a plurality of circuit paths. The components include directional couplers connected in series to combine branch circuits with each branch circuit having a separate attenuator.

Abstract: A system and method for providing distributed amplification of a plurality of input signals is disclosed. The preferred embodiment of the disclosed invention utilizes two substantially different matrixes to dissect an input signal for amplification and subsequent recombination. The unique matrixes disclosed provide for the distributed amplification of any even number of input signals, therefore reducing the number of linear power amplifiers required where a number of input signals other than a power of two are used.

Abstract: An adjustable directional coupler including a housing, a first connector and a second connector secured to the housing, and a main transmission line extending through the housing and between the first and the second connectors. The main transmission line has a center conductor coaxially surrounded by an insulator. A circuit board is secured within the housing, with a first edge of the circuit board being generally parallel to the main transmission line and the circuit board being transversely adjustable with respect to the main transmission line. At least one auxiliary line is mounted on the circuit board and includes a pick-up link extending from a network juncture. The pick-up link is adjacent to and parallel with the first edge of the circuit board. A third connector is also secured to the housing.

Abstract: An S/N enhancer is provided which can be formed to be small in size and in which impedance matching can easily be achieved. The S/N enhancer includes two magnetostatic wave elements. First to fourth transducers each in the shape of a single line are disposed on YIG thin films of the magnetostatic wave elements in parallel and spaced from one another. An input terminal is connected to one end of the first transducer. An attenuator is connected between the other end of the first transducer and one end of the third transducer. A 180.degree. shifter and another attenuator are connected in series between one end of the second transducer and one end of the fourth transducer. An output terminal is connected to the other end of the fourth transducer. The other ends of the second and third transducers are respectively grounded.

Abstract: A bidirectional converter/interface for connecting several two-way broadb RF cables to a single pair of optical fibers is provided. In the reception mode, a broadband RF carrier of an optical conductor signal is directed to a plurality of bandpass filter/block converter combinations. These filter/converter combinations segment the broadband RF carrier into predetermined RF bands carrying the information. Each segmented band is then shifted (either up or down) to the receiving band frequency utilized by each of the RF systems. In the transmission mode, each transmitted signal from one of the RF systems is passed to a return path block converter/bandpass filter combination that shifts the entire transmitted band to a predetermined band. The predetermined bands are chosen such that each is a unique, non-overlapping band associated with a particular one of the RF systems.

Abstract: A spacecraft includes a plurality of paralleled RF amplifiers. Each paralleled power amplifier (206) includes a signal splitter (222) which produces two nominally equal-amplitude signals, and a signal combiner (242) which combines appropriately phased signals to produce a sum signal at a sum port (250). The signal combiner also includes a null output port (248). A pair of elemental amplifiers (236, 238) is coupled between the splitter outputs and the combiner inputs. In order to allow for phase drift of the elemental amplifiers, at least one phase shifter (258) is associated with one of the elemental amplifiers. A phase control loop is coupled from the null output of the combiner, around the paralleled amplifier arrangement, and controls the phase shifter to maintain the phase within bounds, to maximize the signal at the sum port of the combiner.

Abstract: A differential line driver having a pair of transistors arranged as a differential pair for driving a transmission line with a differential logic output signal produced in accordance with a differential logic input signal fed to the base electrodes of the pair of transistors. The differential line driver includes circuitry for suppressing EMI emissions generated by common mode voltage switching transients produced at the collector electrodes of the pair of transistors in response to changes in the differential logic input signal. The common mode voltage switching transient suppression circuitry includes a pair of additional transistors. The differential logic input signal is fed to base electrodes of the additional transistors, and through such additional transistors, to the base electrodes of the pair of transistors of the differential pair. In one embodiment of the invention, the additional transistors are connected in a Darlington pair arrangement with the pair of transistors of the differential pair.

Abstract: A low loss high frequency transmitting/receiving switching module (100) having an input and output port (106,110), that individually may be connected to an antenna or external port (108,112) by applying an appropriate bias potential to a switching circuit (140). The switching circuit (140) is designed to operate with only a single diode (130). This is accomplished by using two, four-port 3 db directional couplers (102,104) connected with two coupling lines (114,118). The switching diode (130) is used to add or delete a transmission line (142) in one of the coupling lines (118) to proved a signal phase shift. The switching circuit (140) switches in or out a 180 degree phase shift to change the phase relationship between signals in the two sets of coupling lines (114,116,118,120) to determine which ports (106,108,110,112) of the directional couplers (102,104) are interconnected.

Abstract: The invention relates to a directional coupler arrangement and measurement of radio frequency electric power with a directional coupler arrangement, which arrangement comprises a directional coupler, in which a terminal impedance, a detector element and a control circuit are connected between the end of the second conductor element and the earth potential. The impedance value of the terminal impedance can be altered by means of an electric control signal and said control circuit produces said control signal on the basis of the signal provided by the detector element. When the detected power level is low, the control circuit increases the impedance value of the terminal impedance, whereby the peak voltage of the signal applied to one end of the directional coupler increases and the arrangement yields a measurement result that is larger than ordinary, which improves the accuracy and reliability of the arrangement at low power levels.

Abstract: A power distributor for microwave signals has n inputs and n outputs, n/2 coupler elements, four power distributor elements each having n/2 inputs and n/2 outputs. The inputs of the first and third distributor elements correspond to respective inputs of the distributor and the outputs of the second and fourth distributor elements correspond to respective outputs of the distributor. The outputs of the first distributor element are connected to respective first inputs of the couplers and the outputs of the third distributor element are connected to respective second inputs of the couplers. The inputs of the second distributor element are connected to respective first outputs of the couplers and the inputs of the fourth distributor element are connected to respective second outputs of the couplers.