JP2002009552A - Frequency multiplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frequency multiplier in which the frequency of an inputtable signal inputted is made into a broadband. SOLUTION: An input side Lange coupler 10 with the finger length of D receives an input signal with a prescribed input band (f1-f2), outputs a 1st fundamental wave signal (phase: 0 deg.) and a 2nd fundamental wave signal (phase: 90 deg.), FETs 32, 34 output 2nd harmonics (phases 180 deg., 0 deg.) of the 1st and 2nd fundamental wave signals, an output side Lange coupler 20 with a finger length of D/2 (output band 2f1-2f2) adds the 2nd harmonic of the 2nd fundamental wave signal whose phase is increased by 90$0 to the 2nd harmonic wave of the 1st fundamental wave signal and outputs the result to an output terminal 22. Since the finger lengths D, D/2 of the input and output side Lange couplers 10, 20 are decided inversely proportionally to the input (output) band, the frequency bands coped with the input and output side Lange couplers 10, 20 are differentiated, thereby making the frequency of the signal able to be inputted into a broadband.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency multiplier, and more particularly, to a frequency multiplier having a wide band.

[0002]

2. Description of the Related Art Conventionally, a frequency multiplier that outputs a harmonic such as a second harmonic has an input matching circuit that receives an input signal and an output that outputs a second harmonic or the like of the input signal as an output signal. And a side matching circuit. For example, in a frequency multiplier that outputs a double wave, if the frequency of the input signal is 4 [GHz] to 8 [GHz], the frequency of the output signal is 8 [GH].
z] -16 [GHz].

Here, in such a frequency multiplier, in order to improve VSWR (Voltage Standing-WaveRatio), a frequency band which can correspond to an input-side matching circuit and an output-side matching circuit. To be common. For example,
If the frequency of the input signal is 4 [GHz] to 8 [GHz] and the frequency of the output signal is 8 [GHz] to 16 [GHz], the frequency band that the input side matching circuit and the output side matching circuit can support is 4 [GHz] -1
Set to 6 [GHz]. That is, the range from the lowest frequency of the input signal to the highest frequency of the output signal is set as a frequency band that can be used by the input side matching circuit and the output side matching circuit.

[0004]

However, from the lowest frequency of the input signal to the highest frequency of the output signal,
In order to make the frequency band compatible with the input side matching circuit and the output side matching circuit, it is difficult to widen the frequency multiplier, that is, to widen the frequency range of the input signal. The reason will be described below.

For example, if the frequency of an input signal is 4 [GHz] -8
[GHz] and the frequency of the output signal is 8 [GHz] to 16 [GHz], the corresponding frequency band of the input side matching circuit and the output side matching circuit is set to 4 [GHz] to 16 [GHz]. That is, the band of the frequency multiplier 1 is 8-4 = 4 [GHz]. The bandwidth of the frequency multiplier 1 is only one third of the frequency band 16-4 = 12 [GHz] that can be accommodated by the input side matching circuit and the output side matching circuit. Therefore, the band of the frequency multiplier 1 is
This is considerably smaller than the frequency bands of the input side matching circuit and the output side matching circuit, so that it is difficult to widen the frequency multiplier 1.

Accordingly, an object of the present invention is to provide a frequency multiplier in which the frequency of a signal that can be input is widened.

[0007]

According to the first aspect of the present invention, a first fundamental wave signal having the same frequency as an input signal is received upon receiving an input signal in a predetermined input band. A second fundamental signal having a frequency and a predetermined phase difference,
And a harmonic output means for outputting a harmonic signal of the first fundamental signal and the second fundamental signal, and a value obtained by dividing the frequency of the harmonic signal by the frequency of the input signal. Output side signal output means corresponding to the output band multiplied by the input band, combining and outputting a harmonic signal corresponding to the first fundamental signal and a harmonic signal corresponding to the second fundamental signal, The frequency band that the input-side signal output means can support and the frequency band that the output-side signal output means can support are different,
Things.

According to the frequency multiplier configured as described above, the frequency band that can be handled by the signal input means and the frequency band that can be handled by the signal output means are different. Therefore, it is not necessary to allow the signal input means to handle from the lowest frequency of the input signal to the highest frequency of the output signal. It is not necessary to allow the signal output means to handle from the lowest frequency of the input signal to the highest frequency of the output signal. Therefore,
The frequency band of the input signal of the frequency multiplier does not become significantly smaller than the frequency band that the signal input means can support. Therefore, the frequency band of the input signal of the frequency multiplier can be widened.

According to a second aspect of the present invention, in the first aspect, the input signal output means and the output signal output means are Lange couplers.

According to a third aspect of the present invention, when an input signal of a predetermined input band is received, a first fundamental wave signal having the same frequency as the input signal, and a first fundamental wave signal having the same frequency and a predetermined position as the first fundamental wave signal are received. A second fundamental wave signal having a phase difference, an input-side Lange coupler that outputs a harmonic signal, a harmonic output means that outputs a harmonic signal of the first fundamental signal and the second fundamental signal, and a frequency of the input signal that is a harmonic. The value obtained by multiplying the value obtained by dividing the frequency of the signal by the finger length of the input Lange coupler is the finger length, and the phase of the harmonic signal corresponding to the second fundamental signal is added to the harmonic signal corresponding to the first fundamental signal. And an output-side Lange coupler that synthesizes and outputs the modified version.

According to the frequency multiplier configured as described above, the frequency band of signals that can be input and output by the Lange coupler is determined by the finger length, which is the distance between terminals on the same side. Therefore, if the finger length of the input Lange coupler is adjusted to the frequency band of the input signal, and the finger length of the output Lange coupler is adjusted to the frequency band of the output signal,
The frequency band of the input signal of the frequency multiplier does not become significantly smaller than the frequency band that can be supported by the input-side Lange coupler and the output-side Lange coupler. Therefore, the frequency band of the input signal of the frequency multiplier can be widened.

A fourth aspect of the present invention is the invention according to the first or second aspect, further comprising phase changing means for changing the phase of the harmonic signal and outputting the same to the output-side signal output means. is there.

A fifth aspect of the present invention is the invention according to the third aspect, further comprising phase changing means for changing the phase of the harmonic signal and outputting the same to the output-side Lange coupler.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the harmonic output means is an FET.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments of the present invention, a frequency multiplier using a Lange coupler will be described. This is merely a comparative example for comparing the operation and the effect of the embodiment. It should be noted that the comparative example is a hypothetical example that would be obtained when a Lange coupler is used for a conventional frequency multiplier.

FIG. 1 shows a configuration of a frequency multiplier using a Lange coupler as a comparative example. The frequency multiplier 1 outputs a double wave whose frequency is doubled, and includes an input-side Lange coupler 10 and an output-side Lange coupler 20.
An input terminal 12, a ground resistor 14, and transmission lines 16 and 18 are connected to the input-side Lange coupler 10. An output terminal 22, a ground resistor 24, and transmission lines 26 and 28 are connected to the output-side Lange coupler 20. The input-side Lange coupler 10 and the output-side Lange coupler 20 are connected by FETs (Field Effect Transistors) 32 and 34 via transmission lines.

Here, the input-side Lange coupler 10 and the output-side Lange coupler 20 are connected to the VSWR (Voltag) of the frequency multiplier 1.
In order to improve the e Standing-Wave Ratio (voltage standing wave ratio), the finger length D needs to be common. The finger length D is the input (output) terminal 12 (2
2) and the distance between the ground resistor 14 (24). Also, the transmission line 1 of the input (output) side Lange coupler 10 (20)
The distance between 6, 18 (26, 28) is also the finger length D
be equivalent to.

The distance between the input (output) terminal 12 (22) and the ground resistor 14 is determined by the input (output) terminal 12 (2
This is the distance between the parallel lines when a parallel line is drawn directly beside from 2) and the ground resistor 14. Here, FIG. 6 shows an actual Lange coupler. Since the input (output) terminal 12 (22) and the ground resistor 14 are not wires but have a size, if the finger length D is defined according to an actual product, it becomes as shown in FIG.

The reason why the input Lange coupler 10 and the output Lange coupler 20 have the same finger length leads to an improvement (increase) in the VSWR.

The frequency f0 (f1 <f0 <
When the input signal of f2) is input, the transmission lines 16 and 18
To the signal. Assuming that the phase of the input signal is 0 °,
A signal whose phase does not change is transmitted to the transmission line 1.
8, a signal whose phase has been increased by 90 ° is output. In addition,
The amount of phase change in the signal output to the transmission line 18 is determined by the finger length D.

The signal passing through the transmission lines 16 and 18 is F
Input to the gates of ET32 and ET34. FET32, 3
The drain output of No. 4 includes not only a fundamental wave of frequency f0 but also a second harmonic (frequency: 2f0). Where F
The phase of the drain output of the ET32 is 180 ° for the fundamental wave,
The double wave becomes 180 °. The phase of the drain output of the FET 34 is 270 ° for the fundamental wave and 0 ° for the second harmonic. Therefore, the drain outputs of the FETs 32 and 34 are
It is input to the output-side Lange coupler 20 via 6 and 28.

The output terminal 22 of the output Lange coupler 20 outputs a signal obtained by combining or adding the signal from the transmission line 26 and the signal from the transmission line 28. During this combination, that is, the addition, the phase of the signal from the transmission line 26 does not change, but the phase of the signal from the transmission line 28 increases by 90 ° for the fundamental wave and 180 ° for the second harmonic. This is because the input-side Lange coupler 10 and the output-side Lange coupler 20 have a common finger length and a common phase shift amount for changing the phase.

Therefore, in the case of the fundamental wave, the phase of the signal from the transmission line 26 is 180 °, and the phase of the signal from the transmission line 28 is 90 ° from 270 ° and is 360 °, that is, 0 °.
°. Therefore, in the fundamental wave, the signal from the transmission line 26 and the signal from the transmission line 28 are out of phase with each other, that is, cancel each other, thereby reducing the fundamental wave.

On the other hand, in the case of the second harmonic, the phase of the signal from the transmission line 26 is 180 °, and the phase of the signal from the transmission line 28 is increased by 180 ° from 0 ° to 180 °. Therefore, the fundamental wave increases because the signal from the transmission line 26 and the signal from the transmission line 28 have the same phase, that is, the phases match.

Therefore, the second harmonic (frequency: 2f0 = 2 × f0) is output from the output terminal 22 more strongly than the fundamental wave (frequency: f0). Therefore, the VSWR of the frequency multiplier 1 is improved.

The input side Lange coupler 10 has an input terminal 12
And a signal having a frequency of f1 to f2 [Hz] is input from the output side Lange coupler 20, and a frequency of 2
A signal from f1 to 2f2 (= 2 × f2) [Hz] is to be output. In order to improve the VSWR, the input Lange coupler 10 and the output Lange coupler 20 need to have the same finger length D. Therefore, the input-side Lange coupler 10 and the output-side Lange coupler 20 have a common frequency band. If the frequency band is not f1 to 2f2 [Hz], the frequency multiplier 1 does not operate normally.

However, since the frequency band of the input-side Lange coupler 10 and the output-side Lange coupler 20 must be from f1 to 2f2 [Hz], it is necessary to widen the frequency multiplier 1, that is, to increase the range from f1 to f2. Is difficult. The reason will be described below.

For example, it is assumed that f1 = 4 [GHz] and f2 = 8 [GHz]. The frequency band of the input-side Lange coupler 10 and the output-side Lange coupler 20 ranges from f1 = 4 [GHz] to 2f2 = 16.
Must be up to [GHz]. That is, the band f2-f1 = 4 [GHz] of the frequency multiplier 1 is equal to the frequency band 2f2 of the input-side Lange coupler 10 and the output-side Lange coupler 20.
-It is only one third of f1 = 12 [GHz]. That is, the band of the frequency multiplier 1 is determined by the input-side Lange coupler 10.
Further, since the frequency band is considerably smaller than the frequency band of the output Lange coupler 20, it is difficult to broaden the frequency multiplier 1 in a wide band.

As described above, even in a virtual comparative example in which a Lange coupler is used in a conventional frequency multiplier, there is a problem that the frequency band of a signal that can be input to the frequency multiplier becomes narrow.

Therefore, a frequency multiplier having a wide band will be described as an embodiment of the present invention with reference to the drawings.

First Embodiment The first embodiment has a common feature that the finger length D of the input-side Lange coupler 10 is different from the comparative example, but the finger length of the output-side Lange coupler 20 is D / 2. Are different.

In this configuration, the finger length of the input Lange coupler 10 is adjusted to the frequency band of the input signal, and the finger length of the output Lange coupler 20 is adjusted to the frequency band of the output signal. Therefore, the input-side Lange coupler 10
Is different from the frequency band that the output-side Lange coupler 20 can support.

First, the configuration of the first embodiment will be described.
FIG. 2 shows a configuration of the frequency multiplier according to the first embodiment. The frequency multiplier 1 outputs a doubled wave whose frequency is doubled, and includes an input-side Lange coupler 10, an output-side Lange coupler 20, and FETs 32 and 34.

The input side Lange coupler 10 has an input terminal 1
2, the ground resistor 14 and the transmission lines 16 and 18 are connected. From the input terminal 12, the input-side Lange coupler 10 receives an input signal in a predetermined input band between frequencies f1 and f2. The ground resistor 14 is a resistor that grounds the input-side Lange coupler 10. A first fundamental signal having the same frequency and the same phase as the input signal is output to the transmission line 16. The transmission line 18 has the same frequency and phase as the input signal at 90 °.
The advanced second fundamental signal is output. The input Lange coupler 10 corresponds to input signal output means.

The finger length of the input Lange coupler 10 is D, and the frequency band of a signal that can be input is from f1 to f2.
Up to.

The FET 32 strongly outputs a harmonic, particularly a second harmonic, of the first fundamental signal passed through the transmission line 16. However, a fundamental wave having the same frequency as the first fundamental wave signal is also output. The FET 34 strongly outputs harmonics of the second fundamental wave signal that has passed through the transmission line 18, particularly, a second harmonic. However, a fundamental wave having the same frequency as the second fundamental wave signal is also output. FET
Reference numerals 32 and 34 correspond to harmonic output means for outputting harmonics of the first fundamental wave signal and the second fundamental wave signal.

The output side Lange coupler 20 has an output terminal 2
2, the ground resistor 24 and the transmission lines 26 and 28 are connected. From the output terminal 22, a signal obtained by synthesizing a signal obtained by changing the phase of a harmonic (especially, a second harmonic) of the second fundamental signal with a harmonic (especially, a second harmonic) of the first fundamental wave signal is output. I do. The fundamental waves of the first fundamental wave signal and the second fundamental wave signal are hardly output. The ground resistor 24 is a resistor for grounding the output Lange coupler 20. In the transmission line 26,
The output signal of the FET 32 is input. The output signal of the FET 34 is input to the transmission line 28. The output-side Lange coupler 20 corresponds to an output-side signal output unit.

The finger length of the output Lange coupler 20 is D / 2, and the frequency band of a signal that can be input is 2f1.
(= 2 × f1) to 2f2 (= 2 × f2).
That is, the value obtained by dividing the frequency of the first fundamental wave signal and the frequency of the second fundamental wave signal by the frequency of the harmonic (second harmonic) signal output from the FETs 32 and 34 is 、, and this value is divided by the input Lange coupler 10. The value D / 2 multiplied by the finger length D of
This is the finger length of the output-side Lange coupler 20.

In general, the width of the input / output band of the Lange coupler is inversely proportional to the finger length. Therefore, twice the width of the frequency band that can be input to the input Lange coupler 10 is equal to the frequency that can be output from the output Lange coupler 20. Bandwidth.

FIG. 3 is a diagram comparing the frequency band of the input / output signal in the comparative example with the frequency band of the input / output signal in the first embodiment.

FIG. 3A is a diagram showing frequency bands of input / output signals in the comparative example. Input band is 4 [GHz]-
8 [GHz], and the output band is 8 [GHz] -16 [GHz]. The finger lengths of the input-side Lange coupler 10 and the output-side Lange coupler 20 are both D.
Input-side Lange coupler 10 and output-side Lange coupler 20
Are 4 [GHz] to 16 [GHz] in common. Bandwidth is 12
[GHz]. Therefore, the input band of the frequency multiplier 1 is
Input-side Lange coupler 10 and output-side Lange coupler 20
Is only one-third of the bandwidth available for input and output.

FIG. 3B is a diagram showing a frequency band of input / output signals in the first embodiment. The finger length of the input-side Lange coupler 10 is D, and the width of the inputtable band is 12 [GHz]. Therefore, f1 = 4 [GHz], f2
= 4 + 12 = 16 [GHz]. Then, the band of the output signal is from 2f1 to 2f2, that is, 8 [GHz] -32 [GHz].
And the width is 24 [GHz]. Here, the finger length of the output-side Lange coupler 20 is D / 2, and the width of the band that can be output is 12 × 2 = 24 [GHz]. Therefore,
The output side Lange coupler 20 has an output signal band of 8 [GHz]
It operates normally even at 32 [GHz]. As described above, the width of the input band of the frequency multiplier 1 is changed from 4 [GHz] to 12 [GHz].
Can be tripled. However, in the input band of the input-side Lange coupler 10, harmonic components (8, 12
[GHz], etc.), the lower limit of the input band of the input-side Lange coupler 10 is reduced as shown in FIG. May be used as the input band.

As in the first embodiment, the finger length of the input Lange coupler 10 and the output Lange coupler 2
In the case where the finger length is set to be different from 0,
Although there is a concern that the VSWR may be deteriorated or reduced, the operation will be described in the operation of the first embodiment.

Next, the operation of the first embodiment will be described.
When an input signal having a frequency f0 (f1 <f0 <f2) is input to the input terminal 12, the signal is distributed to the transmission lines 16 and 18. Assuming that the phase of the input signal is 0 °, the transmission line 16
A signal whose phase does not change is output to the transmission line 18, and a signal whose phase is increased by 90 ° is output to the transmission line 18. The transmission line 18
Is determined by the finger length D.

The signal passing through the transmission lines 16 and 18 is F
Input to the gates of ET32 and ET34. FET32, 3
The drain output of No. 4 includes not only a fundamental wave of frequency f0 but also a second harmonic (frequency: 2f0). Where F
The phase of the drain output of the ET32 is 180 ° for the fundamental wave,
The double wave becomes 180 °. The phase of the drain output of the FET 34 is 270 ° for the fundamental wave and 0 ° for the second harmonic.

FIG. 4 shows the calculation of the phases of the fundamental wave and the harmonic (second harmonic) output from the FETs 32 and 34. FIG. 4A shows the output signal of the FET 32, and FIG.
FIG. 6 is a diagram illustrating an output signal of No. 4;

Since the phase of the fundamental wave is inverted by the FETs 32 and 34, the phase of the signal passing through the transmission lines 16 and 18 increases by 180 °. As for the double wave, the doubled wave is inverted. Thus, the result is as shown in FIG.

Returning to FIG. 2, the drain outputs of the FETs 32 and 34 are input to the output Lange coupler 20 via the transmission lines 26 and 28.

The output terminal 22 of the output Lange coupler 20 outputs a signal obtained by combining the signal from the transmission line 26 and the signal from the transmission line 28. During this synthesis, the phase of the signal from the transmission line 26 does not change, but the phase of the signal from the transmission line 28 is 45 ° for the fundamental wave and 90 ° for the second harmonic.
° increase. The finger length of the output-side Lange coupler 20 is の of the finger length of the input-side Lange coupler 10, and the amount of phase shift for changing the phase is proportional to the finger length. Further, since the wavelength of the second harmonic is １ ／ of the wavelength of the fundamental wave, the phase is doubled, and the second harmonic changes by 45 ° × 2 = 90 °.

Therefore, in the fundamental wave, the phase of the signal from the transmission line 26 is 180 °, and the phase of the signal from the transmission line 28 is 45 ° from 270 ° and becomes 315 °. Therefore,
In the fundamental wave, the signal from the transmission line 26 and the signal from the transmission line 28 are close to the opposite phases, and are considerably canceled out and reduced.

On the other hand, in the second harmonic, the phase of the signal from the transmission line 26 is 180 ° and the phase of the signal from the transmission line 28 is 0 °.
It increases from 90 ° to 90 ° to 90 °. Therefore, in the fundamental wave, the signal from the transmission line 26 and the signal from the transmission line 28 are close to the same phase, and the signals increase constructively.

Therefore, the second harmonic (frequency: 2f0) is output from the output terminal 22 more strongly than the fundamental wave (frequency: f0). Therefore, the VSWR of the frequency multiplier 1
Does not worsen as much as we are concerned about.

Therefore, according to the first embodiment, the finger lengths of the input Lange coupler 10 and the output Lange coupler 20 are changed according to the frequency band of the input / output signal. That is, the frequency band that the input-side Lange coupler 10 can support is different from the frequency band that the output-side Lange coupler 20 can support. Therefore, the input band of the frequency multiplier becomes wide.

Further, although there is a concern that the VSWR may be deteriorated, the VSWR does not actually deteriorate so much.

Second Embodiment In the second embodiment, the output of the FET 34 is supplied to the phase shifter 40 and the output of the phase shifter 40 is supplied to the output Lange coupler 20 according to the first embodiment. different.

FIG. 5 shows the configuration of the frequency multiplier 1 according to the second embodiment. Except for the phase shifter 40, it is the same as the first embodiment. The phase shifter 40 changes the phase of the output signal of the FET 34 and outputs the result.

Next, the operation of the second embodiment will be described. For example, assume that the phase shifter 40 is set to increase the phase by 45 °. Then, the phase of the fundamental wave output from the FET 34 is 270 °, and 315 ° obtained by adding 45 ° thereto.
Is the phase of the signal output from the phase shifter 40. Phase shifter 40
The phase of the fundamental wave signal output from the output side Lange coupler 2
By 0, the angle is further increased by 45 ° to 360 °, that is, 0 °.

Therefore, the fundamental wave output from the output terminal 22 by the output-side Lange coupler 20 is a signal (phase: 180 °) from the transmission line 26 and a signal (phase: 180 °) from the transmission line 28.
0 °) is in the opposite phase and cancels each other. this is,
This leads to improvement of the VSWR of the frequency multiplier 1.

Further, for example, the phase shifter 40 is set to a phase of 9
Suppose that it is set to increase by 0 °. Then, FE
The phase of the second harmonic output from T34 is 0 °, and
90 ° obtained by adding 0 ° becomes the phase of the signal output from the phase shifter 40. The phase of the fundamental wave signal output from the phase shifter 40 is further increased by 90 ° by the output Lange coupler 20 to 18
0 °.

Therefore, the second harmonic output from the output terminal 22 by the output Lange coupler 20 is a signal (phase: 180 °) from the transmission line 26 and a signal (phase: 180 °) from the transmission line 28.
180 °) becomes in-phase and increases constructively. this is,
This leads to improvement of the VSWR of the frequency multiplier 1.

The amount by which the phase of the phase shifter 40 is varied may be changed as appropriate, and is not limited to 45 ° and 90 °. Further, the phase shifter 40 may be connected to the FET 32.

According to the second embodiment, the FETs 32, 3
4 can be appropriately changed by the phase shifter 40, so that the VSWR of the frequency multiplier 1 can be further improved as compared with the first embodiment.

[0063]

According to the present invention, the frequency band which can be handled by the signal input means and the frequency band which can be handled by the signal output means are made different, so that the frequency band of the input signal of the frequency multiplier can be widened. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a comparative example of a virtual frequency multiplier for comparison with an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a frequency multiplier according to the first embodiment of the present invention.

FIG. 3 is a diagram comparing a frequency band of input / output signals in a comparative example with a frequency band of input / output signals in the first embodiment.

FIG. 4 is a diagram illustrating calculation of the phases of a fundamental wave and a harmonic (second harmonic) output from FETs 32 and 34;

FIG. 5 is a block diagram showing a configuration of a frequency multiplier according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a configuration of a Lange coupler.

[Explanation of symbols]

 Reference Signs List 10 input Lange coupler 20 output Lange coupler 32, 34 FET 40 phase shifter

Claims (6)

[Claims] A first fundamental wave signal having the same frequency as the input signal; and a second fundamental wave signal having the same frequency and a predetermined phase difference as the first fundamental signal. An input-side signal output unit that outputs a fundamental signal, a harmonic output unit that outputs a harmonic signal of the first fundamental signal and the second fundamental signal, and a frequency of the harmonic signal. Corresponding to an output band obtained by multiplying a value obtained by dividing the frequency of the input signal by the input band, the harmonic signal corresponding to the first fundamental signal and the harmonic signal corresponding to the second fundamental signal. A frequency multiplier, comprising: an output-side signal output unit configured to output the synthesized signal, wherein a frequency band that the input-side signal output unit can support and a frequency band that the output-side signal output unit can support are different. 2. The frequency multiplier according to claim 1, wherein said input signal output means and said output signal output means are Lange couplers. 3. A first fundamental wave signal having the same frequency as the input signal, and a second fundamental wave signal having the same frequency and a predetermined phase difference as the first fundamental wave signal, receiving an input signal in a predetermined input band. An input-side Lange coupler that outputs a fundamental signal; a harmonic output unit that outputs a harmonic signal of the first fundamental signal and the second fundamental signal; and a harmonic signal that indicates a frequency of the input signal. The value obtained by multiplying the value obtained by dividing the frequency of the input-side Lange coupler by the finger length is the finger length, and the harmonic signal corresponding to the first fundamental signal is the harmonic signal corresponding to the second fundamental signal. A frequency multiplier comprising: an output-side Lange coupler that synthesizes and outputs a wave signal whose phase has been changed. 4. The frequency multiplier according to claim 1, further comprising a phase changing means for changing a phase of said harmonic signal and outputting the same to said output side signal output means. 5. The frequency multiplier according to claim 3, further comprising phase changing means for changing the phase of the harmonic signal and outputting the same to the output-side Lange coupler. 6. The frequency multiplier according to claim 1, wherein said harmonic output means is an FET.