Abstract: Power amplifying systems and modules and components therein are designed based on CRLH structures, providing high efficiency and linearity.

Abstract: An electrical component, e.g., a diplexer or a duplexer, can have one of a number of diverse arrangements for terminal surfaces on the substrate bottom. For example, the terminal surfaces for first and second filters are not disposed at the maximum distance from one another. First and second filters can be disposed as one or two discrete components on the substrate, wherein one filter can be implemented as being integrated in a multilayer substrate.

Abstract: For the cost effective implementation of negative-index refraction, an anisotropic hyperbolic planar metamaterial is provided. The material has a first set of substantially parallel, unloaded and coplanar transmission lines that are spaced with a periodicity dy. It has a second set of substantially parallel, unloaded and coplanar transmission lines that are spaced with a periodicity dx and are coplanar and substantially orthogonal with the first set of transmission lines. The periodicities of the first set and second set of transmission lines are governed by the relationship ?x(fr)dx+?y(fr)dy=2?, where: ?x and ?y are the intrinsic propagation constants of electromagnetic waves of frequency fr propagating along the first and second set of transmission lines, respectively.

Abstract: A high-frequency circuit comprising a switch circuit for properly switching the connection of an antenna terminal and four input/output terminals; a first received-signal output terminal being connected to a receiving circuit of a first communications system via a filter circuit; a second received-signal output terminal being connected to a receiving circuit of a second communications system via a filter circuit; a first transmitting-signal input terminal being connected to a transmitting circuit of a first communications system; and a second transmitting-signal input terminal being connected to a transmitting circuit of a second communications system via a power amplifier circuit, the high-frequency circuit further comprising a bandpass filter circuit disposed in any one or more paths between the antennas and the transmitting-signal input or received-signal output; and a detection circuit having a voltage detection terminal for monitoring the output power of the power amplifier circuits.

Abstract: A balun signal splitter for use in transceiver systems, such as wireless communications systems, including a wide-band balun with a secondary winding for signal splitting between two operating bands (e.g., high-band and low-band) or modes. An example of a balun signal splitter configured for dual-band or dual-mode operation or includes a balun having a primary winding and a secondary winding, the secondary winding having a first port and a second port, a first network coupled to the first port and configured to present a short circuit impedance at the first port at out-of-band frequencies or during out-of-mode operation, and a second network coupled to the second port and configured to present a short circuit impedance at the second port at out-of-band frequencies or during out-of-mode operation.

Abstract: A small antenna duplexer that includes antenna terminal, first filter electrically connected to this antenna terminal and passing a first frequency band, second filter electrically connected to antenna terminal and passing a second frequency band, and third filter electrically connected to antenna terminal and passing a third frequency band. First filter and third filter are used for one band, and second filter and third filter are used for another band.

Abstract: A division circuit includes: a signal input/output terminal to and from which two signals, that is, a first signal using a first frequency band and a second signal using a second frequency band higher than the first frequency band, are input and output; a first low-pass filter which does not pass the second signal and passes the first signal; a first high-pass filter which is formed such that a plurality of serial resonant circuits set at different resonant frequencies, respectively, is cascaded in parallel and which does not pass the first signal and passes the second signal; and a division point connecting one end of the first low-pass filter to one end of the first high-pass filter between the signal input/output terminal, the first low-pass filter, and the first high-pass filter. In the plurality of series resonant circuits, a first serial resonant circuit is located from the division point.

Abstract: A signal splitter comprising an input and a plurality of outputs is provided, wherein alternate outputs are connected to phase shifting devices. The phase shifting devices preferably comprise phase shifting transformers and introduce a phase shift of 180°, so that noise components of alternate outputs are antiphase and cancel one another out almost entirely when the signals are summed. Also provided is a cable television network comprising a plurality of such signal splitters to ensure that noise ingress in upstream signals passing into the network is substantially reduced.

Abstract: A duplexer includes a common terminal, receiving filters, a transmitting filter, and a hybrid having four terminals (terminals 1 to 4). A first terminal (terminal 1), which is one of the four terminals of the hybrid is connected to the common terminal, the receiving filters are connected to a second terminal and a third terminal to which a signal is transmitted if it is input from the first terminal, and a transmitting filter is connected to a fourth terminal (terminal 4) of the hybrid. Thus, it is possible to improve the isolation of the duplexer, while avoiding an increase in the number of parts as well as greater complexity.

Abstract: A duplex filter includes a core of dielectric material with top, bottom, and side surfaces, and first and second spaced-apart sets of through-holes extending therethrough. A wall extends outwardly from the top surface to define a peripheral rim and cavity. A pattern of metallized and unmetallized areas are defined on selected core surfaces including strips of metallization on the top surface that extend onto the wall and the peripheral rim thereof to define respective transmit, receive, and antenna connection posts. In one embodiment, the core is made from two separate blocks which have been coupled together to define an interior metallized layer which separates the first and second sets of through-holes and an exterior wall on the top surface separates the respective transmit and receive conductive patterns thereon.

Abstract: Described is a filtering arrangement in which a first filter is configured to exhibit a first frequency response FR and has a first node and a second node; a second filter is configured to exhibit a second FR and has a first node and a second node; and a third filter is configured to exhibit a third FR and has a first node and a second node. A first common node interfaces the second node of the first filter with the second node of the second filter; and a second common node interfaces the first node of the second filter with the first node of the third filter. The second FR exhibited by the second filter isolates a first signal on a first signal path between the first node of the first filter and the first common node from a second signal on a second signal path between the second common node and the second node of the third filter.

Abstract: A system includes more than one subsystem, each subsystem operating within a different subsystem frequency range, the subsystems comprising a circulator having three or more circulator ports and a direction of circulation, the circulator operating within a specific frequency range of the subsystem frequency range, and a filter, such as a bandpass filter, connected to at least one of the circulator ports. The filters each define a subsystem port and operate within the specific frequency range. Each subsystem port has a port index determined by the direction of circulation of the circulator within the subsystem. Each subsystem port has a specific port index that is connected to a common port having the specific port index. At least one of the circulator ports may be terminated to a matched load. Each subsystem circulator may comprise at least three circulator ports, with a filter connected to each of the circulator ports.

Abstract: A duplexer of the present invention includes a reception filter (3) for passing signals in a predetermined frequency band and attenuates signals in the other frequency bands among reception signals input to an antenna port, and a transmission filter (4) for passing signals in a predetermined frequency band and attenuates signals in the other frequency bands among transmission signals input from the outside and outputting them to the antenna port. The duplexer further includes a conversion circuit (22) provided with a single-ended input terminal connected to the antenna port and balanced output terminals. The reception filter (3) is provided with a balanced input terminal connected to the output terminal of the conversion circuit (22) and a balanced output terminal for outputting the filtered reception signal.

Abstract: A split-band system for processing a broadband input signal is disclosed. A signal divider divides the input signal into at least a higher frequency band and a lower frequency band. The lower frequency band is processed in a lower frequency circuit path. The higher frequency band is processed in a higher frequency circuit path. The higher frequency circuit path has a group delay equal to the lower frequency circuit path. A signal combiner combines the processed lower frequency band and the processed higher frequency band into an output signal.

Abstract: A multiplexer circuit may include a first-frequency-quarter-wavelength transmission line extending between a junction between a common terminal and a second-frequency terminal, and a first-frequency low-impedance circuit electrically directly connecting the first transmission line to a circuit ground. In some examples, a second-frequency-quarter-wavelength transmission line may extend between the first transmission line and a third-frequency terminal. A second-frequency low-impedance circuit may electrically directly connect the second transmission line to the circuit ground. The first and second transmission lines and the first and second low-impedance circuits may provide a third-frequency transmission line. A further second-frequency low-impedance circuit may electrically couple the second terminal to the first transmission line. A third-frequency low-impedance circuit may electrically couple the second terminal to the circuit ground.

Abstract: A synchronization pulse representing a symbol boundary in a signal such as an OFDM signal is obtained by deriving a first signal representing the difference between the amplitudes of samples separated by the useful part of an OFDM symbol, a second signal representing the phase difference between the samples, and combining the first and second signals to derive a resultant signal. The resultant signal is examined and the synchronization pulse generated in response to the signal changing in a predetermined manner.

Abstract: A radio frequency filter (1) comprises an input impedance adaption section (2) and a tank capacitor section (3). Thereby, the capacity of the input impedance adaption section (2) does not comprise a fixed capacitor, it only comprises switchable capacitors. Further, the tank capacitor section (3) does not comprise a fixed capacitor as well it only comprises switchable capacitors. The capacity of the input impedance adaption section (2) can be tuned independent of the tank capacity, section capacity by means of switchable capacitors. Hence, bandwidth and frequency of the radio frequency filter can be modified independent of each other. The imput impendance adaption section (2) is connected in series between the input and output of the filter (1). The tank capacitor section (3) is shunt connected between the input-output series path of the filter (1) and ground.

Abstract: A composite high-frequency component includes a diplexer arranged to separate/combine transmission/reception signals in frequency bands of a plurality of communication systems, transmit/receive switches, filters, and a balanced-unbalanced reception signal switch, and a matching circuit. The balanced-unbalanced reception signal switch includes a reception signal switch and balanced-unbalanced filters. A stripline in the transmit/receive switch and a stripline in the reception signal switch are provided on the same layers, and the matching circuit including capacitors is arranged between the transmit/receive switch and the reception signal switch.

Abstract: A filter circuit includes a phase inversion branching circuit branching an input signal and outputting separately first and second signals with mutually-inverted phases from first and second output terminals; a first band rejection filter connected the first output terminal of the phase inversion branching circuit and having a first rejection band; a second band rejection filter connected to the second output terminal of the phase inversion branching circuit and having a second rejection band different from the first rejection band; and a combiner combining the outputs of the first and second band rejection filters.

Abstract: There is provided a resonant circuit includes a resonator, an inductor connected in parallel with the resonator, and a capacitor connected in parallel with the resonator. There are also provided a filter and an antenna duplexer having the above-described resonant circuit.

Abstract: An embodiment of regulation and shaping circuit includes a first input terminal for receiving a first input signal with a first frequency; a second input terminal for receiving a second input signal with a second frequency higher than the first frequency; a first circuital branch coupled to the first input terminal and, through first coupling means active at the first frequency, to an output terminal for providing an output signal; a second circuital branch coupled to the second input terminal and to the output terminal, wherein said second circuital branch comprises a negative feedback circuital loop adapted to control the output signal according to the second input signal.

Abstract: The present invention provides a filter circuit that can achieve both sharp bandpass characteristics and high power handling capability. The filter circuit includes: an input terminal that has a signal input; a four-port device that divides input signals; a band stop filter that has the center frequency of the input signals within the stopband, and causes the out-of-stopband signals among the input signals to pass; two bandstop resonators circuits that cause the signals passing through the band stop filters to pass, and reflect the signals; open ends that are connected in parallel to the two bandstop resonators circuits; and an output terminal that outputs the signals reflected by the band stop filters and the bandstop resonators circuits and combined at the four-port device.

Abstract: A technique for realizing module size reduction while enhancing the anti-ESD characteristic of a low frequency band circuit without the need to add such an element as an ESD filter. In a diplexer included in a high-frequency power amplifier module, a composite grounding inductor with respect to an antenna terminal is formed of three inductors including a series inductor contained in a lowpass filter. Since an ESD signal contains main components thereof belonging to a frequency band of the order of a few hundreds of MHz or lower, the ESD signal is allowed to pass through a lowpass filter almost intactly. Under this condition, a function for ESD filtering from the antenna terminal to an antenna switch circuit is provided by using the composite grounding inductor mentioned above and an electrostatic capacitor element, thereby suppressing passage of the ESD signal to the antenna switch circuit.

Abstract: An active distributed signal splitting apparatus has an architecture conducive for cost-effective expandability, and provides improved features including, for example, independent frequency selection for output signals. According to an exemplary embodiment, the apparatus includes a source of an input signal and a plurality of output points. A signal splitter including a field effect transistor is coupled between the source of the input signal and the plurality of output points. One of the output points associated with the field effect transistor includes a filter.

Abstract: An HF-line includes parallel branches with bias terminals, to which a direct voltage source is respectively connected via a first inductor and a second inductor. The inductors are inductively coupled to one another.

Abstract: A controlled RF active duplexer comprises two distributed amplifiers and means for controlling them. Each distributed amplifier comprises an input line and an output line, the output line of the first distributed amplifier being common to the input line of the second distributed amplifier. An end of the input line of the first distributed amplifier forms the input port, an end of the output line of the second distributed amplifier forms the output port and an end of the line common to the two distributed amplifiers forms the input/output port. The distributed amplifiers are placed in the on state or in the off state in opposition to one another as a function of the ports to be made to communicate. The invention makes it possible to carry out the splitting of the RF signals within a compact space and isolation between input port and output port.

Abstract: A subminiature, high-performance monolithic duplexer is disclosed. The monolithic duplexer includes a substrate, a transmitting-end filter formed in a first area on an upper surface of the substrate, a receiving-end filter formed in a second area on the upper surface of the substrate, a packaging substrate, bonded on an area on the upper surface of the substrate, for packaging the transmitting-end filter and the receiving-end filter in a sealed state, and a phase shifter, formed on one surface of the packaging substrate and connected to the transmitting-end filter and the receiving-end filter, respectively, for intercepting a signal inflow between the transmitting-end filter and the receiving-end filter.

Abstract: A technology which can realize a high-performance multiband operation in a compact circuit configuration and is advantageous for a wireless terminal of GSM system for which the further increase of the demands is expected in the future is provided. Provided is a multiband switch type antenna duplexer adopted in a mobile phone used in TDMA system such as the GSM system, in which the signals of respectively different first to fourth frequency bands (GSM 850, EGSM, DCS, PCS) share a single antenna, wherein switching elements such as receive filters and diodes are combined in various ways to perform the high-performance band switch with the minimum number of switching elements. The circuit of this antenna duplexer can realize not only the size reduction of the multiband switch antenna duplexer but also the size reduction and performance improvement of the wireless terminal itself.

Abstract: A time division duplexing (TDD) transmission/reception apparatus and method are provided. The TDD transmission/reception apparatus includes: a transmitter which generates a transmitted signal; an antenna which transmits the transmitted signal to an external device and receives a received signal from an external device; a receiver which restores source data by demodulating the received signal; and a polarized duplexer which has a first end connected to the transmitter and the receiver and a second end connected to the antenna and comprises an inclined surface, the inclined surface polarizing the transmitted signal and the received signal such that the directivity of the transmitted signal and the directivity of the received signal are perpendicular to each other.

Abstract: The present invention is directed to a system that includes a front-end interface device having a first front-end interface port, a second front-end interface port and a third front-end interface port. The front-end interface device is configured to split a first signal directed into the first front-end interface port into a second signal provided at the second front-end interface port and a third signal provided at the third front-end interface port. The first signal has a first bandwidth, the second signal has a second bandwidth and the third signal has a third bandwidth. The second bandwidth is substantially disposed in a relatively high frequency portion of the first bandwidth and the third bandwidth is substantially disposed in a relatively low frequency portion of the first bandwidth. An N-way high-band device includes a first high-band device port coupled to the second front-end interface port and N second high band ports. N is an integer greater than or equal to two (2).

Abstract: A reverse orthomode junction assembly with associated filters for use in an antenna feed system for transmitting a first electromagnetic signal at a first frequency range lower than the second frequency range of a receive second electromagnetic signal. The assembly includes an orthomode junction with an antenna port for connecting to an antenna, an opposed generally coaxial first signal port to transmit the first signal, and a generally perpendicular second signal port, located there between, to receive the second signal. A first signal channel having on-axis second signal reject filters connects to the first port; and a second signal channel having cross-axis first signal reject filters connects to the second port. The use of a magic-tee as a combiner for the receive signal provides tracking capability to the antenna feed system.

Abstract: An improved component for the separation or combination of high frequency outputs includes a coaxial input port located at the front end of the outer conductor. At the opposite end of the outer conductor, a head is located with at least two, and preferably three or four, single ports which cover the outer conductor connections. The head with the single ports is built as a single part to avoid any mechanical connection junctions. The head with the single ports which form integral outer conductor connectors consists of a forged part or a cast part.

Abstract: A resonator device includes a plurality of resonators which are connected in series. An inductor and a capacitor are connected in parallel with at least one of the plurality of resonators. At least another one of the plurality of resonators has no inductor or capacitor connected in parallel therewith. Therefore, a sufficiently large attenuation outside the passband can be attained when the resonator device is used in a filter. Furthermore, the resonator device can be reduced in size.

Abstract: A wireless communication apparatus is made up of a transmission circuit block including an antenna that is laid out such that the transmission lines, i.e., the sum of the distance connecting respective circuit blocks between an output terminal of the transmission power amplifier to an input/output terminal of the antenna is shorter than the transmission line, i.e., the sum of the distance connecting respective circuit blocks between an input terminal of a transmission power amplifier and an output terminal of a RFIC disposed at a preceding stage of the transmission power amplifier. This arrangement realizes a wireless communications apparatus ensuring improvement of overall performance of the wireless application without reducing the total transmission loss or improving the performance of individual circuits.

Abstract: A composite duplexer includes an antenna terminal, a first receiving terminal, a second receiving terminal, a transmitting terminal, a first switch, a duplexer, and a second switch. The first switch includes a first branch contact, a second branch contact connected with the transmitting terminal, a third branch contact connected with the second receiving terminal, and a first common contact connected with the first antenna terminal. The first common contact of the first switch is connected selectively with the first branch contact, the second branch contact, and the third branch contact. The first duplexer includes a first receiving filter connected with the first receiving terminal, and a first transmitting filter. The duplexer is connected with the first branch contact of the first switch. The second switch is operable to connect and disconnect electrically between the first transmitting filter of the first duplexer and the transmitting terminal.

Abstract: A diplexer circuit comprising a common terminal, a low-frequency-side terminal, a high-frequency-side terminal, a low-frequency-side path comprising a low-frequency filter disposed between the common terminal and the low-frequency-side terminal, and a high-frequency-side path comprising a high-frequency filter disposed between the common terminal and the high-frequency-side terminal, the low-frequency filter comprising a first transmission line series-connected to the low-frequency-side path and a capacitor parallel-connected to part of the first transmission line.

Abstract: There is provided a radio communication apparatus for transmitting transmission signals of the channel CH1 and the channel CH2, including a first antenna, a second antenna, a dual-band transmitting/receiving circuit having a first terminal for the channel CH1 and a second terminal for the channel CH2, a first branching circuit configured to receive a transmission signal from the first terminal or the second terminal, a second branching circuit configured to divide the transmission signal from the first branching circuit between the first antenna and the second antenna, and a transmission line configured to connect the first branching circuit and the second branching circuit.

Abstract: A second band pass filter that is used in a filter device, which has a relatively high pass band, in the pass band of a first band pass filter is provided. One end of a second IDT of a second longitudinally coupled resonator surface acoustic wave filter portion is connected to a first balanced terminal and the other end thereof is connected to a second balanced terminal. Each of a first longitudinally coupled resonator surface acoustic wave filter portion and the second longitudinally coupled resonator surface acoustic wave filter portion has narrow pitch electrode finger portions. The number of electrode fingers of the narrow pitch electrode finger portion of the second IDT of the first longitudinally coupled resonator surface acoustic wave filter portion is greater than the number of electrode fingers of the narrow pitch electrode finger portion of the second IDT of the second longitudinally coupled resonator surface acoustic wave filter portion.

Abstract: When an attenuation pole produces, highly-efficient-izing and a miniaturization of a filter are enabled by changing the electric length between a branch point and each filter. The 1st band pass filter 5 that has the characteristics of center frequency f1, and the 2nd band pass filter 7 that has the characteristics of different center frequency f2 from center frequency f1, In co-planer filter 3 provided with transmission line 9 which connects the 1st band pass filter 5 and the 2nd band pass filter 7, and branch point 11 formed in transmission line 9. It is designed so that an attenuation pole may produce in either [at least] the 1st band pass filter 5 or the 2nd band pass filter 7, and the frequency region which the formation position of branch point 11 is adjusted and an attenuation pole produces is adjusted.

Abstract: Comb generators include a nonlinear transmission line (NLTL) having one or more NLTL sections. Each NLTL section includes one or more nonlinear elements and transmission line portions that provide transmission line dispersion. Typically, the nonlinear elements are Schottky diodes, and a pulse forming bias network is configured to establish Schottky diode bias conditions using a periodic signal that is input to the comb generator. For input periodic signals at frequencies between about 500 MHz and 1 GHz, output signals are produced having substantial power in frequency components at frequencies up to at least about 50 GHz.

Abstract: A simplified digital implementation of a fourth order Linkwitz-Riley crossover network is provided using approximations and transformations of the classical form. The approximation is particularly beneficial when the crossover frequency is low relative to the digital sampling rate, such as when an audio stream is split between bass and treble at about 30-300 Hz and the sampling frequency is about 100 times the cutoff frequency or higher. Rather than merely cascading two sets of second order filters, such as Butterworth filters, a fourth order transfer function is more directly implemented. Conventional transfer functions are simplified through approximations resulting in the elimination of all except one parameter, c, which is a linear function of the cutoff frequency. Additionally, multipliers are moved in line with the integrator elements.

Abstract: A high frequency module incorporates a layered substrate. The layered substrate has a bottom surface and a top surface. Terminals are disposed on the bottom surface. SAW filters and inductors are mounted on the top surface. The layered substrate incorporates: a first conductor layer connecting the SAW filters to the inductors; a second conductor layer connected to the terminals and disposed at a location closer to the bottom surface than the first conductor layer; and a plurality of parallel signal paths each of which is formed using at least one through hole provided inside the layered substrate and each of which connects the first and second conductor layers to each other.

Abstract: A composite duplexer includes an antenna terminal, a first receiving terminal, a second receiving terminal, a transmitting terminal, a first switch, a duplexer, and a second switch. The first switch includes a first branch contact, a second branch contact connected with the transmitting terminal, a third branch contact connected with the second receiving terminal, and a first common contact connected with the first antenna terminal. The first common contact of the first switch is connected selectively with the first branch contact, the second branch contact, and the third branch contact. The first duplexer includes a first receiving filter connected with the first receiving terminal, and a first transmitting filter. The duplexer is connected with the first branch contact of the first switch. The second switch is operable to connect and disconnect electrically between the first transmitting filter of the first duplexer and the transmitting terminal.

Abstract: A dual bandstop filter affects frequencies in a lower passband, first and second stopbands separated by a middle passband, and an upper passband. The filter includes two legs. In one version, one leg is a highpass filter while the other leg is a bandstop filter outputting into a lowpass filter. In a second version, one leg is a lowpass filter while the other leg is highpass filter outputting into a bandstop filter. The first version is preferred when the upper value of the lower passband is around 100 MHz or less, while the second version is preferred when the upper value of the lower passband is around 100 MHz or more. In a third version, one leg is a highpass filter while the other leg is a bandstop filter sandwiched between two lowpass filters, preventing second resonances from the lowpass filter from interfering with desired frequencies in the upper passband.

Abstract: A dual bandstop filter affects frequencies in a lower passband, first and second stopbands separated by a middle passband, and an upper passband. The filter includes two legs. In one version, one leg is a highpass filter while the other leg is a bandstop filter outputting into a lowpass filter. In a second version, one leg is a lowpass filter while the other leg is highpass filter outputting into a bandstop filter. The first version is preferred when the upper value of the lower passband is around 100 MHz or less, while the second version is preferred when the upper value of the lower passband is around 100 MHz or more. In a third version, one leg is a highpass filter while the other leg is a bandstop filter sandwiched between two lowpass filters, preventing second resonances from the lowpass filter from interfering with desired frequencies in the upper passband.

Abstract: In a filter module, a common input/output portion of a switch circuit is set as a first port. A first filter arranged to pass a signal in a first frequency band is connected between a first input/output portion of the switch circuit and a second port. A second filter arranged to pass a signal in a second frequency band is connected between a second input/output portion and the second port. A phase adjusting circuit is provided such that an impedance in the second frequency band as seen from the first port while the switch circuit selects the first input/output portion is in a substantially short-circuited state. This arrangement prevents leakage of unwanted signals from a signal path used in a communication system not in operation among two communication systems for different frequency bands while the other communication system is engaged in communication.

Abstract: This invention provides a novel electronically tunable active duplexer for wireless transceiver applications. It relates to an active duplexer with full-duplex operation, permitting simultaneous transmission and reception of signals at same or different frequencies. It incorporates varactors, instead of fixed or mechanically adjustable capacitors, in phase shifting networks enabling one to electronically tune, with ease and precision, the frequency at which isolation is desired, over a band in both transmit and receive modes of operations. It can be implemented as a Monolithic Microwave Integrated Circuit (MMIC).

Abstract: A wide bandwidth microwave balun utilizes frequency band splitting and two conventional baluns operating in a high frequency band and a low frequency band, which when combined offer a full bandwidth output, thus to offer wide bandwidth impedance matching and second-harmonic rejection.

Abstract: A wave filter is installed in a multimedia wideband router, and includes a circuit board having a first low-pass wave-filtering circuit, and a band-pass wave-filtering circuit; the band-pass wave-filtering circuit consists of a high-pass wave-filtering circuit and a second low-pass wave-filtering circuit; the first low-pass wave-filtering circuit is connected to the high-pass wave-filtering circuit; the circuit board further includes an input terminal, and a first switching component, which is movable to such a position as to electrically connect the input terminal and a joint between the first low-pass wave-filtering circuit and the high-pass wave-filtering circuit; the circuit board further includes two output terminals, which are connected to the first and the second low-pass wave-filtering circuits respectively; a second switching component is provided on the circuit board, which is movable to such a position as to electrically connect the high-pass wave-filtering circuit and the second low-pass wave-filt

Abstract: The present invention concerns a frequency diplexer with an input port and a first and a second output ports, comprising two directional couplers (14 and 15), an unique filter (16) that entails either a first or a second frequency response, and, a first and a second T splitters (19, 40).