JP2011146812A - Filter device and filter method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device with less passage loss, where frequency bands for simultaneous passage and the number of the bands are made variable. <P>SOLUTION: An input signal is branched into different frequency bands by a branching filter 11, and output to amplitude adjusters 13-1 to 13-n. A control part 12 instructs the amplitude adjuster to which the signal of the frequency band other than the frequency bands for passage among the amplitude adjusters 13-1 to 13-n is input to attenuate a power level. The amplitude adjusters 13-1 to 13-n output, in accordance with the instruction from the control part 12, the signals input from the branching filter 11 as they are or by performing attenuation, to a matching circuit 14. The matching circuit 14 combines the signals input from the amplitude adjusters 13-1 to 13-n to obtain one signal, and then, outputs the one signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filter device and a filter method for passing a signal component in a desired frequency band.

  Conventionally, when the frequency band of a signal component to be passed is made variable, a method of arranging a plurality of filters and switching a filter to be used by a switch (for example, refer to Non-Patent Documents 1 and 2) or a variable capacitance element such as a varactor diode is used. A method of changing the frequency characteristics of the filter itself by using the method has been used (for example, see Non-Patent Document 3).

Takenaka et al., “MMIC chip set for RF spectrum analyzer front end”, IEICE Technical Report MW94-83, pp. 61-68, 1994 Takahashi et al., “Examination of elemental technology in Reconfigurable RF front-end”, IEICE Technical Report SR2006-18, pp. 31-34, 2006 Ki-Byoung Kim et al., "Application of RF Varactor UsingBaxSr1-xTiO3 / TiO2 / HR-Si Substrate for Reconfigurable Radio", IEEE transactions on ultrasonics, ferroelectrics, and frequency control, vol. 54, no. 11, november 2007

  The conventional technology as described above has a problem that only one frequency band can be passed at a time. In addition, when a variable-capacitance element such as a varactor diode is used to make the frequency variable, the resistance component of the varactor diode increases the filter pass loss compared to a fixed frequency dielectric filter. there were.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to change the number of frequency bands and the number of the frequency bands that can be simultaneously transmitted, and to reduce multi-band filter devices and filters. It is to provide a method.

  In order to solve the above-described problem, the present invention provides a demultiplexing unit that separates and outputs a signal into a plurality of frequency bands, a control unit that controls to change a power level in each of the plurality of frequency bands, and A plurality of amplitude adjustment units provided corresponding to each of a plurality of frequency bands, and configured to change a power level of a signal of the frequency band output from the demultiplexing unit based on control by the control unit; and the plurality of amplitudes And a multiplexing unit that multiplexes the signals whose power levels are changed in the adjustment unit.

  Further, the present invention corresponds to a demultiplexing unit that separates and outputs a signal into a plurality of frequency bands, a control unit that controls to change a power level in each of the plurality of frequency bands, and each of the plurality of frequency bands. A plurality of amplitude adjustment units that change the power level of the signal in the frequency band output from the demultiplexing unit based on control by the control unit, and a plurality of output terminals, each of the output terminals And a combining / distributing unit that combines and outputs the signals whose power levels are changed by the plurality of amplitude adjusting units according to one or more frequency bands targeted by the filter device. It is.

  The present invention also provides a demultiplexing unit that outputs a signal separated into N frequency bands (N is an integer of 2 or more), and a control unit that controls the power level to change in each of the N frequency bands, N amplitude adjustment units provided corresponding to each of the N frequency bands, and changing a power level of the signal of the frequency band output from the demultiplexing unit based on control by the control unit; M (M is a positive number less than or equal to 2 and less than N) combining units that are provided corresponding to one or a plurality of amplitude adjustment units and synthesize the signals whose power levels are changed in the corresponding amplitude adjustment units And a filter device comprising:

  Further, the present invention is the above-described filter device, wherein the control unit attenuates the power level of the frequency band that is not allowed to pass.

  The present invention is the above-described filter device, wherein the control unit controls all of the plurality of frequency bands to substantially the same power level.

  In addition, the present invention is the above-described filter device, and includes a multiplexing / demultiplexing unit that multiplexes a plurality of input signals and separates and outputs the signals to the plurality of frequency bands instead of the demultiplexing unit. It is characterized by that.

  The present invention is the above-described filter device, wherein a superconducting filter is used as the demultiplexing unit.

  Further, the present invention is the above-described filter device, wherein the amplitude adjusting unit is a variable attenuator that attenuates the power level of the signal, a variable gain amplifier that amplifies or attenuates the power level by adjusting the amplitude of the signal, or , A combination of a variable attenuator and a variable gain amplifier, or a combination of a low noise amplifier and a variable attenuator.

  Further, the present invention is the above-described filter device, wherein the amplitude adjusting unit has temperature dependency, and changes the ambient temperature of the amplitude adjusting unit to change the power level of the signal. .

  Further, the present invention is a signal filtering method, comprising: a demultiplexing step for separating a signal into a plurality of frequency bands; a control step for controlling the power level to be changed in each of the plurality of frequency bands; Based on the control, an amplitude adjustment step for individually changing the power level for the signals of the plurality of frequency bands separated in the demultiplexing step, and the plurality of signals for which the power level has been changed in the amplitude adjustment step And a combining step for combining the signals.

  The present invention is also a signal filtering method, a signal filtering method, and a demultiplexing step for separating a signal into a plurality of frequency bands, and a control for changing a power level in each of the plurality of frequency bands. A control step; an amplitude adjustment step for individually changing a power level for the signals of the plurality of frequency bands separated in the demultiplexing step based on the control in the control step; and a power level in the amplitude adjustment step. And a combining / distributing step of combining the plurality of signals in which the plurality of signals are changed in accordance with one or more frequency bands targeted by the plurality of output destinations.

  The present invention also provides a demultiplexing step for separating and outputting a signal into N frequency bands (N is an integer of 2 or more), and a control step for controlling the power level to change in each of the N frequency bands, Based on the control in the control step, the amplitude adjustment step for individually changing the power level for the signals of the N frequency bands separated in the demultiplexing step, and the power level is changed in the amplitude adjustment step And dividing the divided N signals into M (M is a positive number of 2 or more and less than N), and combining the divided signals to generate M signals. This is a filtering method.

  Further, the present invention is the above-described filtering method, characterized in that, in the control step, the power level of the frequency band that is not passed is attenuated.

  Further, the present invention is the above-described filtering method, wherein in the control step, all the plurality of frequency bands are controlled to substantially the same power level.

  In addition, the present invention is the above-described filtering method, characterized in that, instead of the demultiplexing step, a multiplexing / demultiplexing step is performed in which a plurality of signals are combined and then separated into frequency bands and output.

  According to the present invention, since it is possible to control the power level individually for a plurality of frequency bands, any one or a plurality of frequency bands among the plurality of frequency bands or all of the plurality of frequency bands are passed. In addition, a low-loss dielectric filter, a superconducting filter, or the like can be used as a constituent element, and a multi-band variable filter device with low passage loss can be realized. In addition, by individually controlling the power level for a plurality of frequency bands, the power levels of the plurality of frequency bands can be made equal.

It is a figure which shows the structure of the filter apparatus by the 1st Embodiment of this invention. It is a figure which shows the structure of the filter apparatus by 2nd Embodiment. It is a figure which shows the structure of the filter apparatus by 3rd Embodiment. It is a figure which shows the structure of the filter apparatus by 4th Embodiment. It is a figure which shows the structure of the filter apparatus by 5th Embodiment. It is a figure which shows the structural example of 1st Embodiment. It is a figure which shows the structural example of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a diagram illustrating a configuration of a filter device 1 according to the first embodiment. In FIG. 1, the filter device 1 includes a duplexer 11, a control unit 12, amplitude adjusters 13-1 to 13-n (n is an integer of 2 or more), and a matching circuit 14.

  The duplexer 11 has one input terminal and a plurality of output terminals, separates a signal input from the input terminal into signals of n frequency bands, and each of the separated signals is an amplitude adjuster 13-1. Output from the output terminal connected to ~ 13-n. The control unit 12 instructs the amplitude adjusters 13-1 to 13-n to attenuate the power level. The amplitude adjusters 13-1 to 13-n are variable attenuators, for example, and attenuate the power level of the signal input from the duplexer 11 based on an instruction from the control unit 12. The matching circuit 14 has an input terminal connected to each of the amplitude adjusters 13-1 to 13-n and one output terminal, and receives signals input from the amplitude adjusters 13-1 to 13-n. Combined into one signal and output from the output terminal. Instead of the matching circuit 14, a multiplexer or a combiner that combines a plurality of signals may be used.

Next, the operation of the filter device 1 according to the present embodiment will be described.
First, a signal having signal components in a plurality of frequency bands, such as a signal in which signals in a plurality of frequency bands are superimposed, is input to the duplexer 11. When the branching filter 11 branches the inputted signal into N different frequency bands 1 to n, the branched signal in the frequency band i (1 ≦ i ≦ n, i is an integer) is sent to the amplitude adjuster 13-i. Output.

  On the other hand, the control unit 12 receives a frequency band k () that is passed by an instruction input from the outside, for example, an instruction input by a user using an input unit (not shown) or an instruction from a signal processing circuit (not shown). k is an integer of 1 to n). The frequency band k to be passed may be one or plural. The control unit 12 outputs an instruction not to attenuate the power level to the amplitude adjuster 13-k corresponding to the frequency band k to be passed, and the amplitude adjusters 13-j (1 except for the amplitude adjuster 13-k). ≦ j ≦ n, where j is an integer excluding k), for example, outputs an instruction to greatly attenuate the power level, for example, to approach 0.

  In accordance with an instruction from the control unit 12, the amplitude adjuster 13-k outputs the signal of the frequency band k input from the duplexer 11 to the matching circuit 14 as it is, and the amplitude adjusters 13 other than the amplitude adjuster 13-k. -J attenuates the power level of the signal of the frequency band j input from the branching filter 11 according to the instruction from the control unit 12 and outputs the attenuated signal to the matching circuit 14.

  The matching circuit 14 combines the signals input from the amplitude adjusters 13-1 to 13-n with a low loss, and outputs the combined signal. As a result, a signal obtained by filtering the signal component of one or a plurality of frequency bands k is output.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 2 is a diagram illustrating a configuration of the filter device 2 according to the second embodiment. In the figure, the filter device 2 includes a multiplexer / demultiplexer 21, a control unit 22, amplitude adjusters 23-1 to 23-n (n is an integer of 2 or more), and a combiner / distributor 24. .

  The control unit 22 and the amplitude adjusters 23-1 to 23-n have the same functions as the control unit 12 and the amplitude adjusters 13-1 to 13-n of the filter device 1 according to the first embodiment, respectively. The multiplexer / demultiplexer 21 has a plurality of input terminals and output terminals, combines the signals input from the plurality of input terminals, separates the signals into n frequency bands, and separates each of the separated signals. Output from the output terminals connected to the amplitude adjusters 23-1 to 23-n. The synthesizer / distributor 24 includes an input terminal connected to the amplitude adjusters 23-1 to 23-n and a plurality of output terminals, and the amplitude adjusters 23-1 to 23-n according to the output terminals. Synthesizes the signals input from and outputs them. Instead of the combiner / distributor 24, a multiplexer / demultiplexer that multiplexes and demultiplexes a plurality of signals may be used.

Next, the operation of the filter device 2 according to the present embodiment will be described.
First, the multiplexer / demultiplexer 21 synthesizes a plurality of input signals, branches the synthesized signals into frequency bands 1 to n, and outputs them to the amplitude adjusters 23-1 to 23 -n.
The control unit 22 and the amplitude adjusters 23-1 to 23-n perform the same operations as the control unit 12 and the amplitude adjusters 13-1 to 13-n of the filter device 1 according to the first embodiment. That is, the control unit 22 acquires a frequency band k (k is an integer from 1 to n) that is passed by an instruction input from the outside. Also in this embodiment, the frequency band k to pass may be one or plural. The control unit 22 outputs an instruction not to attenuate the power level to the amplitude adjuster 23-k corresponding to the frequency band k, and the amplitude adjuster 23-j (1 ≦ j) excluding the amplitude adjuster 23-k. ≦ n and j are integers excluding k), an instruction to greatly attenuate the power level is output. The amplitude adjuster 23-k outputs the signal of the frequency band k input from the multiplexer / demultiplexer 21 to the combiner / distributor 24 as it is, and the amplitude adjusters 23-j other than the amplitude adjuster 23-k The power level of the frequency band j input from the waver 21 is attenuated according to the instruction of the control unit 12 and output to the combiner / distributor 24.

  A signal to be combined among the signals input from the amplitude adjusters 23-1 to 23-n, that is, a frequency band to be combined, is determined for each terminal included in the combiner / distributor 24. The synthesizer / distributor 24 selects, synthesizes and outputs a signal in the frequency band to be synthesized among the signals input from the amplitude adjusters 23-1 to 23-n for each output destination terminal. Note that the frequency band targeted for synthesis by one terminal may be all or part of the frequency bands 1 to n, or any one of them. Further, the frequency bands to be synthesized by a plurality of output destination terminals may be all the same, may all be different, or some may be the same.

[Third embodiment]
Next, a third embodiment of the present invention will be described.
FIG. 3 is a diagram illustrating a configuration of the filter device 3 according to the third embodiment. In the figure, the filter device 3 includes a multiplexer / demultiplexer 31, a control unit 32, amplitude adjusters 33-1 to 33-n (n is an integer of 2 or more), and matching circuits 34-1 to 34-m ( m is an integer of 2 or more and less than n). The amplitude adjusters 33-1 to 33-n are respectively connected to any of the matching circuits 34-1 to 34-m. Hereinafter, the amplitude adjusters 33-1 to 33-n are collectively referred to as the amplitude adjuster 33, and the matching circuits 34-1 to 34-m are collectively referred to as the matching circuit 34.

  The multiplexer / demultiplexer 31, the control unit 32, and the amplitude adjusters 33-1 to 33-n are respectively the multiplexer / demultiplexer 21, the control unit 22, and the amplitude adjusters 23-1 to 23-1 of the filter device 2 according to the second embodiment. It has the same function as 23-n. The matching circuits 34-1 to 34-m include one or a plurality of input terminals and one output terminal, synthesize the signal input from the amplitude adjuster 33 connected to the input terminal, and output from the output terminal. To do. Instead of the matching circuits 34-1 to 34-m, m multiplexers or synthesizers that multiplex a plurality of signals may be used.

Next, the operation of the filter device 3 according to the present embodiment will be described. The multiplexer / demultiplexer 31, the control unit 32, and the amplitude adjusters 33-1 to 33-n are the multiplexer / demultiplexer 21, the control unit 22, and the amplitude adjusters 23-1 to 23-23 of the filter device 2 according to the second embodiment. The same operation as that of −n is performed.
That is, the multiplexer / demultiplexer 31 synthesizes a plurality of input signals, branches the synthesized signals into frequency bands 1 to n, and outputs them to the amplitude adjusters 33-1 to 33-n, respectively. The control unit 32 acquires a frequency band k (k is an integer from 1 to n) to be passed by an instruction input from the outside. Also in this embodiment, the frequency band k to pass may be one or plural. The control unit 32 outputs an instruction not to attenuate the power level to the amplitude adjuster 33-k corresponding to the frequency band k, and the amplitude adjuster 33-j (1 ≦ j) excluding the amplitude adjuster 33-k. ≦ n and j are integers excluding k), an instruction to greatly attenuate the power level is output. The amplitude adjuster 33-k outputs the signal of the frequency band k input from the multiplexer / demultiplexer 31 as it is to the connection matching circuit 34, and the amplitude adjusters 33-j other than the amplitude adjuster 33-k The power level of frequency band j input from multiplexer / demultiplexer 31 is attenuated and output to matching circuit 34 at the connection destination.

  The matching circuits 34-1 to 34-m combine the signals input from the amplitude adjuster 33 connected to the matching circuits 34-1 to 34-m into one signal and output the signal. As a result, the matching circuits 34-1 to 34-m output signals obtained by filtering signal components of one or a plurality of frequency bands k.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.
FIG. 4 is a diagram illustrating a configuration of the filter device 4 according to the fourth embodiment. In the figure, the filter device 4 includes a duplexer 41, a control unit 42, amplitude adjusters 43-1 to 43-n (n is an integer of 2 or more), and a matching circuit 44.

  The duplexer 41 has one input terminal and a plurality of output terminals, separates a signal input from the input terminal into signals of n frequency bands, and each of the separated signals is an amplitude adjuster 43-1. Output from the output terminal connected to .about.43-n. The control unit 42 instructs the amplitude adjusters 43-1 to 43-n to amplify or attenuate the power level. The amplitude adjusters 43-1 to 43-n increase the gain to amplify the power level by adjusting the amplitude of the signal input from the duplexer 41 based on the instruction of the control unit 42, Attenuate the level. The matching circuit 44 includes an input terminal connected to each of the amplitude adjusters 43-1 to 43-n and one output terminal, and the signals input from the amplitude adjusters 43-1 to 43-n Combine with the signal and output from the output terminal. Instead of the matching circuit 44, a multiplexer or a combiner that combines a plurality of signals may be used.

Next, the operation of the filter device 4 according to the present embodiment will be described.
First, a signal having signal components in a plurality of frequency bands, such as a signal in which signals in a plurality of frequency bands are superimposed, is input to the duplexer 41. When branching the input signal into different frequency bands 1 to n, the demultiplexer 41 outputs the branched frequency band i (1 ≦ i ≦ n, i is an integer) signal to the amplitude adjuster 43-i.

On the other hand, the control unit 42 receives a frequency band k (k is passed through an instruction input from the outside, for example, an instruction input by a user using an input unit (not shown) or an instruction from a signal processing circuit (not shown). Any integer of 1 to n). The frequency band k to be passed may be one or plural. The control unit 42 outputs an instruction not to attenuate or amplify the power level to the amplitude adjuster 43-k corresponding to the frequency band k to be passed, and the amplitude adjusters excluding the amplitude adjuster 43-k In 43-j (1 ≦ j ≦ n, j is an integer other than k), an instruction to greatly attenuate the power level is output.
In addition, when the power level is input to the control unit 42 together with the frequency band k to be passed, the power level of the frequency band k is instructed to the amplitude adjuster 43-k.

  In accordance with an instruction from the control unit 42, the amplitude adjuster 43-k outputs the signal of the frequency band k input from the branching filter 41 to the matching circuit 44 as it is, or amplifies or attenuates it to the instructed power level. Output. In addition, the amplitude adjusters 43-j other than the amplitude adjuster 43-k greatly attenuate the power level of the frequency band j input from the demultiplexer 41 and output to the matching circuit 44 in accordance with an instruction from the control unit 42. To do.

  The matching circuit 44 combines the signals input from the amplitude adjusters 43-1 to 43-n into one signal and outputs it. As a result, a signal obtained by filtering the signal component of one or a plurality of frequency bands k is output.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described.
FIG. 5 is a diagram illustrating a configuration of the filter device 5 according to the fifth embodiment. In the figure, the filter device 5 includes a duplexer 51, a control unit 52, amplitude adjusters 53-1 to 53-n (n is an integer of 2 or more), and a matching circuit 54.

  The duplexer 51 has one input terminal and a plurality of output terminals, separates a signal input from the input terminal into signals of n frequency bands, and each of the separated signals is an amplitude adjuster 53-1. Output from the output terminal connected to .about.53-n. The control unit 52 instructs the amplitude adjusters 53-1 to 53-n to attenuate the power level. The amplitude adjusters 53-1 to 53-n attenuate the power level of the signal input from the duplexer 51 based on an instruction from the control unit 52. The matching circuit 54 includes an input terminal connected to each of the amplitude adjusters 53-1 to 53-n and one output terminal, and the signal input from the amplitude adjusters 53-1 to 53-n is 1 Combined into one signal and output. Instead of the matching circuit 54, a multiplexer or a combiner that combines a plurality of signals may be used.

Next, the operation of the filter device 5 according to the present embodiment will be described.
First, a signal having signal components in a plurality of frequency bands, here, a signal in which signals in frequency bands 1 to n are superimposed is input to the duplexer 51. As shown in the figure, these frequency bands 1 to n have different power levels. When branching the input signal into different frequency bands 1 to n, the duplexer 51 outputs the branched frequency band i (1 ≦ i ≦ n, i is an integer) to the amplitude adjuster 53-i.

  On the other hand, the control unit 52 acquires the power level according to an instruction input from the outside. The control unit 52 instructs the acquired power level to the amplitude adjusters 53-1 to 53-n. The amplitude adjusters 53-1 to 53-n attenuate the power level of the signal input from the duplexer 51 to the instructed power level and output it to the matching circuit 54 in accordance with the instruction from the control unit 52. The matching circuit 54 combines the signals input from the amplitude adjusters 53-1 to 53-n into one signal and outputs it. Thereby, the difference in the power level of the frequency bands 1 to N included in the input signal can be reduced.

In general, a radio receiver handles received signal power that varies within a range of several tens to 100 dB due to attenuation due to the distance between the transmitter and the receiver. On the other hand, an analog-to-digital converter (ADC) that converts an analog signal such as a radio signal into a digital signal often reduces the range of analog signal power that can be processed at a time within 50 to 60 dB in order to reduce costs. . For this reason, when receiving a plurality of signals having a large power difference such as 100 dB as described above, an automatic gain adjustment amplifier (AGC) or the like is used before the ADC, and if a signal with a large power is received, the signal is weakened. When a new signal arrives, the dynamic range is compressed by amplifying it. However, in such a method, when a large power signal and a weak signal are input simultaneously, the gain of the AGC is lowered in accordance with the large power, so that the weak signal is at a level lower than the noise and is difficult to receive.
In particular, when radio signals of a plurality of radio frequencies are received simultaneously and processed by AGC and ADC, transmission due to differences in radio standards such as specific low power standards and weak radio standards, in addition to power differences due to differences in distance between transmitters and receivers Since the difference in power is about 50 dB, there is a problem that the difference in received power further increases.
Therefore, by using the filter device 5 according to the fifth embodiment, it is possible to reduce the difference between the power levels of the frequency bands 1 to N included in the received signal before outputting to the ADC. Thus, since the dynamic range of the received signal can be compressed, the above problem can be solved.

[Configuration example]
Next, a specific configuration example of the filter device of the present invention will be described.
FIG. 6 is a block diagram illustrating a configuration of the filter device 100, and is a specific configuration example of the filter device 1 according to the first embodiment.
In FIG. 1, the filter device 100 includes a triplexer 110, a control unit 120, a variable ATT (ATT: attenuator) 130-1 to 130-3 (hereinafter collectively referred to as “ATT130”), and a triplexer 140. Composed.

The triplexer 110 includes a matching circuit 111 and a filter (hereinafter referred to as “FIL”) 112-1 to 112-3. The matching circuit 111 distributes the input signal to three systems, and the FILs 112-1 to 112-3 pass signals of different frequency bands.
The variable ATT 130-i (1 ≦ i ≦ 3, i is an integer) attenuates the power level of the signal input from the FIL 112-i based on an instruction from the control unit 120.
The triplexer 140 includes FILs 141-1 to 141-n and a matching circuit 142. The FIL 141-i (1 ≦ i ≦ 3, i is an integer) passes a signal in the same frequency band as the FIL 112-i from the signal input from the variable ATT 130-i. The matching circuit 142 combines the signals output from the FILs 141-1 to 141-n and outputs the combined signal.

Next, the operation of the filter device 100 will be described.
Here, FIL112-1 and FIL141-1 pass the frequency band of 800 MHz, FIL112-2 and FIL141-2 pass the frequency band of 2.4 GHz, and FIL112-3 and FIL141-3 pass the frequency band of 5 GHz. Let it pass.

Assume that signals transmitted from a plurality of wireless devices each using a frequency band of 800 MHz, 2.4 GHz, and 5 GHz are simultaneously received by an antenna included in the wireless signal receiving device. This received signal is input to the filter device 100.
The matching circuit 111 of the triplexer 110 distributes the received signal to the FIL 112-1 to FIL 112-3. The FIL 112-1 passes a signal in the frequency band of 800 MHz and outputs it to the variable ATT 130-1, and the FIL 112-2 passes a signal in the frequency band of 2.4 GHz and outputs it to the variable ATT 130-2. 3 passes a signal of a frequency band of 5 GHz and outputs it to the variable ATT 130-3.

For example, when the control unit 120 receives an instruction of a frequency band to be passed from 800 MHz, 2.4 GHz, and 5 GHz, the control unit 120 outputs an instruction not to attenuate the power level to the variable ATT 130 corresponding to the frequency band to be passed. Then, the other variable ATT 130 is instructed to greatly attenuate the power level.
The variable ATT 130-i (1 ≦ i ≦ 3, i is an integer) is a signal input from the FIL 112-i as it is or according to an instruction from the control unit 120, or the power level is greatly attenuated to greatly reduce the FIL 141- of the triplexer 140. output to i.

  The FIL 141-1 of the triplexer 140 passes signals in the 800 MHz frequency band, the FIL 142-2 passes signals in the 2.4 GHz frequency band, and the FIL 142-3 passes signals in the 5 GHz frequency band. The matching circuit 142 combines the signals input from the FILs 142-1 to 142-3 into one signal and outputs the signal.

FIG. 7 is a block diagram illustrating a configuration of the wireless reception unit 300 of the wireless signal reception device, and is a specific configuration example using the filter device 3 according to the third embodiment.
In the figure, a radio receiving unit 300 includes antennas 301-1, 301-2, duplexers 310-1, 310-2, a control unit 320, variable ATTs 330-1-1, 330-1-2, 330-2-1. 330-2-2, matching circuits 340-1, 340-2, and amplifiers 350-1, 350-2. Hereinafter, the variable ATTs 330-1-1, 330-1-2, 330-2-1 and 330-2-2 are collectively referred to as the variable ATT 330.

The duplexer 310-1 includes a matching circuit 311-1 and FILs 312-1-1 and 312-1-2. The matching circuit 311-1 distributes the input signal, and the FILs 312-1-1 and 312-1-2 pass signals of different frequency bands.
The duplexer 310-2 includes a matching circuit 311-2 and FILs 312-2-1 and 312-2-2. The matching circuit 311-2 distributes the input signal, and the FILs 312-12-1 and 312-2-2 pass signals of different frequency bands.

  The variable ATT 330-ij (1 ≦ i ≦ 2, 1 ≦ j ≦ 2, i and j are integers) determines the power level of the signal input from the FIL 312-ij based on an instruction from the control unit 320. Attenuate. The matching circuit 340-i combines the signals output from the variable ATTs 330-i-1 and 341-i-2 and outputs the combined signal. The amplifier 350-i amplifies the signal output from the matching circuit 340-i.

Subsequently, the operation of the wireless reception unit 300 will be described.
Here, FIL 312-1-1 passes the 300 MHz frequency band, FIL 312-1-2 passes the 800 MHz frequency band, FIL 312-2-1 passes the 2.4 GHz frequency band, and FIL 312-2. -2 passes the 5 GHz frequency band.

  The antenna 301-1 receives signals transmitted from a plurality of wireless devices that use frequency bands of 300 MHz and 800 MHz, respectively, and outputs the signals to the duplexer 310-1. The matching circuit 311-1 of the duplexer 310-1 distributes the received signal to the FILs 312-1-1 and 312-1-1. The FIL 312-1-1 passes a signal in the 300 MHz frequency band and outputs it to the variable ATT 330-1-1, and the FIL 312-1-2 passes a signal in the 800 MHz frequency band and changes the variable ATT 330-1-2. Output to.

  On the other hand, the antenna 301-2 receives signals transmitted from a plurality of wireless devices each using a frequency band of 2.4 GHz and 5 GHz, and outputs the signals to the duplexer 310-2. The matching circuit 311-2 of the duplexer 310-2 distributes the received signal to the FILs 312-12-1 and 312-2-2. The FIL 312-2-1 passes a signal in the 2.4 GHz frequency band and outputs the signal to the variable ATT 330-2-1, and the FIL 312-2-2 passes a signal in the frequency band of 5 GHz and outputs the variable ATT 330-2. Output to -2.

When the control unit 320 receives an instruction of a frequency band to be passed from 300 MHz, 800 MHz, 2.4 GHz, and 5 GHz, the control unit 320 outputs an instruction not to attenuate the power level to the variable ATT 330 corresponding to the passed frequency band. The other variable ATT 330 is instructed to greatly attenuate the power level.
The variable ATT 330-i-j outputs the signal input from the FIL 312-i-j as it is or after greatly reducing the power level in accordance with an instruction from the control unit 320. The matching circuit 340-i combines the signals output from the variable ATTs 330-i-1 and 330-i-2 and outputs them as one signal, and the amplifier 350-i is output from the matching circuit 340-i. Amplifies the received signal.

  The duplexer 11 in the first embodiment, the multiplexer / demultiplexer 21 in the second embodiment, the multiplexer / demultiplexer 31 in the third embodiment, the duplexer 41 in the fourth embodiment, and the fifth. A superconducting filter can be used as the duplexer 51 in the embodiment.

  Further, the amplitude adjusters 13-1 to 13-n in the first embodiment, the amplitude adjusters 23-1 to 23-n in the second embodiment, and the amplitude adjusters 33-1 to 33 in the third embodiment. -N, amplitude adjusters 43-1 to 43-n in the fourth embodiment, amplitude adjusters 53-1 to 53-n in the fifth embodiment, in addition to variable attenuators, variable gain amplifiers, or A combination of a variable attenuator and a variable gain amplifier, or a combination of a low noise amplifier and a variable attenuator can be used. In particular, the configuration in which the variable attenuator is placed after the low noise amplifier has an advantage of improving the noise characteristics of the filter.

  Further, the amplitude adjusters 13-1 to 13-n in the first embodiment, the amplitude adjusters 23-1 to 23-n in the second embodiment, and the amplitude adjusters 33-1 to 33 in the third embodiment. -N, As the amplitude adjusters 53-1 to 53-n in the fifth embodiment, amplitude adjusters whose attenuation changes depending on the ambient temperature can be used. In this case, a temperature adjusting device is provided around the amplitude adjuster, and the control units 12, 22, 32, and 52 have a temperature corresponding to the amount of attenuation with respect to the temperature adjusting device provided in the amplitude adjuster. Outputs instructions to do so. Conventionally, the amplitude adjuster was used while keeping the temperature constant, but in this embodiment, the attenuation amount can be easily changed by changing the ambient temperature of the amplitude adjuster according to the required attenuation amount. Can be made.

  Similarly, as the amplitude adjusters 43-1 to 43-n in the fourth embodiment, it is possible to use amplitude adjusters whose gain changes depending on the ambient temperature. In this case, a temperature adjusting device is provided around the amplitude adjuster, and the control unit 42 instructs the temperature adjusting device provided in the amplitude adjuster to set the temperature corresponding to the gain to be amplified or attenuated. Is output.

  Further, a duplexer may be used instead of the duplexer 11 of the first embodiment, the duplexer 41 of the fourth embodiment, and the duplexer 51 of the fifth embodiment, or the second embodiment. Instead of the multiplexer / demultiplexer 31 and the multiplexer / demultiplexer 31 of the third embodiment, a duplexer can be used.

  According to the embodiment described above, a low-loss multiband filter device capable of passing any one or a plurality of frequency bands or all of the plurality of frequency bands among a plurality of frequency bands is realized. It becomes possible. It is also possible to align the power levels of a plurality of frequency bands.

1, 2, 3, 4, 5, 100... Filter device 11, 41, 51...
12, 22, 32, 42, 52, 120, 320 ... control units 13-1 to 13-n, 233-1 to 23-n, 33-1 to 33-n, 43-1 to 43-n, 53- 1 to 53-n: Amplitude adjuster (amplitude adjustment unit)
14, 34-1 to 34-m, 44, 54 ... matching circuit (multiplexing unit)
24 ... Combining distributor (combining distributor)
21, 31 ... multiplexer / demultiplexer (multiplexing / demultiplexing unit)
110, 140 ... triplexers 111, 142, 311-1, 311-2, 340-1, 340-2 ... matching circuits 112-1 to 112-3, 141-1 to 141-3, 312-1-1, 312 -1-2, 312-2-1, 312-2-2 ... Filter (FIL)
130-1 to 130-3, 330-1-1, 330-1-2, 330-2-1, 330-2-2 ... Variable attenuator (variable ATT)
300 ... Wireless receivers 301-1, 301-2 ... Antennas 310-1, 310-2 ... Duplexers 350-1, 350-2 ... Amplifiers

Claims (15)

A demultiplexing unit for separating and outputting a signal into a plurality of frequency bands;
A control unit that controls to change the power level in each of the plurality of frequency bands;
A plurality of amplitude adjustment units provided corresponding to each of the plurality of frequency bands, and changing a power level of the signal of the frequency band output from the demultiplexing unit based on control by the control unit;
A multiplexing unit that combines the signals whose power levels are changed in the plurality of amplitude adjustment units;
A filter device comprising: A demultiplexing unit for separating and outputting a signal into a plurality of frequency bands;
A control unit that controls to change the power level in each of the plurality of frequency bands;
A plurality of amplitude adjustment units provided corresponding to each of the plurality of frequency bands, and changing a power level of the signal of the frequency band output from the demultiplexing unit based on control by the control unit;
Synthetic distribution that has a plurality of output terminals, and each of the output terminals combines and outputs the signals whose power levels are changed according to one or more frequency bands targeted And
A filter device comprising: A demultiplexing unit that divides the signal into N frequency bands (N is an integer of 2 or more) and outputs the frequency band;
A control unit that controls to change the power level in each of the N frequency bands;
N amplitude adjusting units that are provided corresponding to the N frequency bands and change the power level of the signal of the frequency band output from the demultiplexing unit based on control by the control unit;
M (M is a positive number less than or equal to 2 and less than N) combining units that are provided corresponding to one or a plurality of amplitude adjustment units and synthesize the signals whose power levels are changed in the corresponding amplitude adjustment units When,
A filter device comprising:   4. The filter device according to claim 1, wherein the control unit attenuates a power level of the frequency band that is not passed. 5.   5. The filter device according to claim 1, wherein the control unit controls all of the plurality of frequency bands to substantially the same power level. 6.   6. The method according to claim 1, further comprising a multiplexing / demultiplexing unit that multiplexes a plurality of input signals and outputs the signals after separating them into the plurality of frequency bands, instead of the demultiplexing unit. The filter device according to any one of the items.   The filter device according to claim 1, wherein a superconducting filter is used as the branching unit.   The amplitude adjustment unit is a variable attenuator that attenuates the power level of the signal, a variable gain amplifier that amplifies or attenuates the power level by adjusting the amplitude of the signal, or a combination of a variable attenuator and a variable gain amplifier, or The filter device according to any one of claims 1 to 7, wherein the filter device is a combination of a low noise amplifier and a variable attenuator.   The said amplitude adjustment part has temperature dependence, The electric power level of the said signal is changed by changing the atmospheric temperature of the said amplitude adjustment part, The claim in any one of Claims 1-7 characterized by the above-mentioned. The filter device as described. A signal filtering method comprising:
A demultiplexing step for separating the signal into a plurality of frequency bands;
A control step of controlling the power level to change in each of the plurality of frequency bands;
Based on the control in the control step, an amplitude adjustment step for individually changing the power level with respect to the signals of the plurality of frequency bands separated in the demultiplexing step;
A combining step for combining the plurality of signals whose power levels are changed in the amplitude adjusting step;
A filtering method comprising: A signal filtering method comprising:
A demultiplexing step for separating the signal into a plurality of frequency bands;
A control step of controlling the power level to change in each of the plurality of frequency bands;
Based on the control in the control step, an amplitude adjustment step for individually changing the power level with respect to the signals of the plurality of frequency bands separated in the demultiplexing step;
A combining and distributing step of combining the plurality of signals whose power levels are changed in the amplitude adjusting step according to one or more frequency bands targeted by each of a plurality of output destinations;
A filtering method comprising: A demultiplexing step of separating the signal into N frequency bands (N is an integer of 2 or more) and outputting the frequency band;
A control step of controlling the power level to change in each of the N frequency bands;
Based on the control in the control step, an amplitude adjustment step for individually changing the power level for the signals of the N frequency bands separated in the demultiplexing step;
The N signals whose power levels are changed in the amplitude adjustment step are divided into M (M is a positive number not less than 2 and less than N), and the divided signals are combined to generate M signals. And
A filtering method comprising:   The filter method according to any one of claims 10 to 12, wherein in the control step, the power level of the frequency band that is not passed is attenuated.   The filter method according to any one of claims 10 to 13, wherein, in the control step, all of the plurality of frequency bands are controlled to substantially the same power level.   15. The method according to claim 10, further comprising a multiplexing / demultiplexing step of combining a plurality of signals and then separating the signals into a frequency band for output instead of the demultiplexing step. Filtering method.

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