JP2009159361A - High-frequency power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a high-frequency power transmission device operate stably by preventing damages to a power amplifier by reflected waves and making even higher harmonic frequency components totally reflected by filters seem to be terminated from the power amplifier. <P>SOLUTION: A directional coupler 2 and a directional coupler 3 are directional couplers, for which the line length is set to 1/4 of the wavelength of the fundamental wave and which have a coupling factor of 3 dB. A directional coupler 4 and a directional coupler 5 are directional couplers, for which the line length is set to 1/6 of the wavelength of the fundamental wave and which have a coupling factor of 3 dB. A filter 12 and a filter 13 are filters which can totally reflect odd-numbered order harmonics of fifth order or above. Even-numbered order harmonics of the fundamental wave amplified by a power amplifier 1 are absorbed by a terminal resistor 7, odd-numbered order harmonics of the fifth order or above are absorbed by terminal resistors 6 and 8, and third-order harmonics are absorbed by a terminal resistor 9, and only the fundamental wave which is distributed by the directional coupler 4, passes through the filters 12 and 13, and then is synthesized by the directional coupler 5 is output to an output terminal 11. Consequently, reflected waves never come back to the power amplifier 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-frequency power transmission device, and more particularly to a high-frequency power transmission device including at least a power amplifier and a directional coupler.

  FIG. 3 shows a configuration diagram of an example of the high-frequency power transmission apparatus. In the figure, an input terminal 38 is connected to a directional coupler 32 via a power amplifier 31 and a terminal 501. The directional coupler 32 is connected to the filters 33 and 34 through terminals 502 and 503, and is connected to the termination resistor 36 through a terminal 504. The directional coupler 35 is connected to the filter 34 via the terminal 505, connected to the filter 33 via the terminal 506, connected to the output terminal 39 via the terminal 507, and connected to the termination resistor 37 via the terminal 508. It is connected.

  The directional coupler 32 and the directional coupler 35 are directional couplers having a coupling degree of 3 dB configured by a line length of a quarter wavelength of the fundamental wave, such as a microstrip line, a strip line, and a coaxial line. Consists of a distributed constant circuit. The directional coupler 32 equally distributes the fundamental wave and the odd harmonics input from the terminal 501 and outputs them to the terminals 502 and 503. The phase of the fundamental wave and odd harmonics output to the terminal 502 is −90 × n degrees (n is the harmonic order) with respect to the phase of the fundamental wave and odd harmonics output to the terminal 503. Yes. All the even harmonics input from the terminal 501 are output to the terminal 502. The terminal 502 is a terminal that is isolated from the terminal 503.

  The directional coupler 35 is configured such that the phase of the fundamental wave and the harmonic wave input from the terminal 505 is −90 × n degrees with respect to the phase of the fundamental wave and the odd harmonic wave input from the terminal 506 (n is the order of the harmonic wave). ), The fundamental wave and the harmonic wave input from the terminals 505 and 506 are synthesized and output to the terminal 507. All even-order harmonics input to the terminal 505 are output to the terminal 507. The terminal 507 is a terminal that is isolated from the terminal 508. The filter 33 and the filter 34 are filters that have a performance of totally reflecting higher-order harmonics.

  In this high frequency power amplifier, the signal input to the input terminal 38 is power amplified by the power amplifier 31 used at a power level close to saturation, and at this time, a harmonic is generated. The fundamental wave amplified by the power amplifier 31 passes through the filter 33 and the filter 34 via the directional coupler 32, and is further output to the output terminal 39 via the directional coupler 35 and the terminal 507.

  Here, instead of the filters 33 and 34 that totally reflect the harmonics, a filter that absorbs the harmonics may be used. As this type of filter, two U-shaped coupling conductors connecting the conjugate terminals of a λ / 4 strip line of a 3 dB directional coupler are arranged vertically, and an input terminal is connected to one of the two coupling conductors. A filter having a structure in which two terminals are connected to the output terminal and an absorption resistor is connected to each other can be used (see, for example, Patent Document 1). According to the filter described in Patent Document 1, the fundamental wave signal input to the input terminal appears at the output terminal, but the harmonic signal of the fundamental wave can be absorbed by the absorption resistor.

Japanese Utility Model Publication No. 61-100002

  However, in FIG. 3, the second and higher harmonics output from the power amplifier 31 are totally reflected by the filter 33 and the filter 34, and the odd harmonics are totally reflected by the filter 34. The even-order harmonic wave is totally reflected by the filter 33 and returns to the power amplifier 31 via the directional coupler 32, causing damage or damage to the power amplifier 31. End up.

  In order to operate the power amplifier 31 with high efficiency, the power amplifier 31 is usually used at a power level close to saturation, but distortion occurs when used at a power level close to saturation. There are also non-linear distortion inherent in the transistor and distortion that occurs in the circuit configuration. Due to these distortions, harmonics are generated in the signal amplified by the power amplifier 31 as described above, but it is necessary to remove the harmonics before outputting from the antenna in accordance with the Radio Law.

  In order to remove the harmonics, the removal by the filters 33 and 34 is generally performed. However, as described above, the harmonics totally reflected by the filter 33, particularly the second to fourth harmonics having a high power level are reflected to the power amplifier 31. Damage or break down parts.

  Further, the filters 33 and 34 that totally reflect the second to fourth harmonics close to the fundamental wave need to have large and steep characteristics. Furthermore, the filter described in Patent Document 1 also has a large structure in which two U-shaped coupling conductors are arranged above and below, and requires a steep characteristic.

  The present invention has been made in view of the above points, prevents damage to the power amplifier due to reflected waves, and can operate stably even when the filter appears to be terminated from the power amplifier even at harmonic frequencies that are totally reflected. An object of the present invention is to provide a high-frequency power transmission device with a simplified filter configuration.

  In order to achieve the above object, the present invention is a cascade connection composed of a power amplifier that amplifies an input signal and a line length of a predetermined first wavelength of a fundamental wave of a signal output from the power amplifier. A fundamental terminal and odd harmonics of a signal output from the power amplifier are connected to a first terminal by a pair of first directional couplers and a first termination resistor connected to the first directional coupler. And a first directional coupling means for absorbing even-order harmonics to the first termination resistor, and a line length of a predetermined second wavelength of the fundamental wave of the signal output from the power amplifier, A configuration comprising at least a pair of cascaded second directional couplers and a second termination resistor connected to the second directional coupler, wherein the first directional coupling means is a first one. The fundamental wave and oddity of the signal output from the power amplifier output from the A second directional coupling unit that terminates odd harmonics among the second harmonics by the second terminating resistor and synthesizes only the fundamental wave and outputs it from the second terminal to the output terminal. Features.

  According to the present invention, since the reflected wave of the harmonic does not return to the power amplifier at all, it does not damage or damage the power amplifier and absorbs the harmonic generated with respect to the high frequency power amplified by the power amplifier. Thus, the power amplifier can be prevented from being damaged and can be stably operated.

  Next, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a configuration diagram of a first embodiment of a high-frequency power transmission device according to the present invention. In the figure, the high-frequency power transmission apparatus includes a power amplifier 1, directional couplers 2 to 5, termination resistors 6 to 9, an input terminal 10, and an output terminal 11. The power amplifier 1 is a power amplifier that is used at a power level close to saturation and outputs an amplified fundamental wave and a harmonic that is an integral multiple of the fundamental wave. The directional coupler 2 and the directional coupler 3 connected in cascade are directional couplers having a coupling degree of 3 dB configured by a line length of a quarter wavelength of the fundamental wave, and are microstrip lines, strip lines, and coaxials. It consists of a distributed constant circuit like a line. The directional coupler 2 and the directional coupler 3 may be a broadband directional coupler having a 4/3 wavelength of the fundamental wave.

  The directional coupler 2 equally distributes the fundamental wave and odd harmonics output from the power amplifier 1 and input via the terminal 101, and outputs them to the terminal 102 and the terminal 103. The phases of the fundamental wave and odd harmonics output to the terminal 102 are −90 × n degrees (n is the order of the harmonics) with respect to the phases of the fundamental wave and odd harmonics output to the terminal 103. Yes. The directional coupler 2 outputs all the input even harmonics to the terminal 102. The terminal 105 is a terminal that is isolated from the terminal 101.

  In the directional coupler 3, the phase of the fundamental wave and the harmonic wave input from the terminal 102 is −90 × n degrees (n is a harmonic wave) with respect to the phase of the fundamental wave and the odd harmonic wave input from the terminal 103. The fundamental wave and odd harmonics input from the terminal 102 and the terminal 103 are combined and output to the terminal 104. In addition, the directional coupler 3 outputs all even harmonics input from the terminal 102 to the terminal 106. The terminal 106 is a terminal that is isolated from the terminal 104.

  The directional coupler 4 and the directional coupler 5 connected in cascade are directional couplers having a coupling degree of 3 dB configured by a line length of 1/6 wavelength of the fundamental wave, and are microstrip line, strip line, coaxial It consists of a distributed constant circuit like a line. Note that the directional coupler 4 and the directional coupler 5 may be broadband directional couplers of 3/6 wavelength of the fundamental wave.

  The directional coupler 4 is a signal having a 4/6 wavelength of the fundamental wave input from the directional coupler 3 via the terminal 104 and the terminal 201, that is, a signal having a frequency 1.5 times that of the fundamental wave, and the fundamental wave. Are distributed to the terminals 202 and 203. The signal of 1.5 times the frequency of the fundamental wave output to the terminal 202 and the phase of the odd-order harmonic are the signal of 1.5 times the frequency of the fundamental wave output to the terminal 203 and the phase of the odd-order harmonics. On the other hand, it is −90 × n degrees (n is the harmonic order).

  Further, the directional coupler 4 outputs all even-order harmonics to a terminal 202 with respect to a signal having a frequency 1.5 times the fundamental wave input from the directional coupler 3 through the terminal 104. The terminal 204 is a terminal that is isolated from the terminal 201.

  The directional coupler 5 is a fundamental in which a signal having a frequency 1.5 times the fundamental wave input from the filter 12 through the terminal 206 and the phase of the odd harmonic are input from the filter 13 through the terminal 205. When the signal has a frequency 1.5 times higher than the wave and the phase of the odd-order harmonic is −90 × n degrees (n is the harmonic order), the signal is input via the terminal 205 and the terminal 206, respectively. A signal having a frequency 1.5 times that of the fundamental wave and the odd harmonics are combined and output to the output terminal 11 via the terminal 207.

  Further, the directional coupler 5 outputs all even-order harmonics with respect to a signal having a frequency 1.5 times the fundamental wave input from the filter 12 via the terminal 206 to the terminal 208. The terminal 208 is a terminal that is isolated from the terminal 207. The directional couplers 4 and 5 are in a band where the fundamental wave input to the directional coupler 4 can also be distributed and synthesized. Therefore, the directional coupler 4 distributes the fundamental wave, and the directional coupler 5 Can be synthesized.

  Termination resistors 6-9 are resistors for terminating the isolation terminals 105, 106, 204, 208 of the directional couplers 2-5. The filter 12 and the filter 13 are filters that can totally reflect odd-order harmonics of the fifth or higher order. The filter 12 and the filter 13 may be a band-pass filter that passes only the fundamental wave, or may be a band-blocking filter or a low-pass filter that totally reflects only the fifth-order or higher harmonics.

  Next, the operation of this embodiment will be described. In FIG. 1, a power amplifier 1 is used at a power level close to saturation, and amplifies a high frequency signal input from an input terminal 10. As a result, not only a power-amplified fundamental wave signal but also a harmonic having a frequency that is an integral multiple of the fundamental wave is generated at the output of the power amplifier 1.

  The directional coupler 2 and the directional coupler 3 are directional couplers having a coupling degree of 3 dB configured by a line length of a quarter wavelength of the fundamental wave. Since the center frequency is the same as that of the fundamental wave, Of the output signal of the power amplifier 1 input from the terminal 101 of the directional coupler 2, even-order harmonics go straight without being distributed by the directional coupler 2, pass through the terminal 102, and then the terminal 106 of the directional coupler 3. And is absorbed by the terminating resistor 7.

  On the other hand, among the output signals of the power amplifier 1 input from the terminal 101, the fundamental wave and the odd-order harmonics are terminals with a phase difference of 90 × n degrees (where n is the harmonic order) in the directional coupler 2. 102 and the terminal 103 are equally distributed and synthesized by the directional coupler 3. Therefore, only the fundamental wave and odd harmonics are output to the terminal 104 of the directional coupler 3 and supplied to the directional coupler 4.

  The directional coupler 4 and the directional coupler 5 are directional couplers having a line length of 1/6 wavelength of the fundamental wave and having a coupling degree of 3 dB. The center frequency is 1.5 times that of the fundamental wave. is there. The directional coupler 4 is a signal having a 4/6 wavelength of the fundamental wave input from the directional coupler 3 via the terminal 104 and the terminal 201, that is, a signal having a frequency 1.5 times that of the fundamental wave, and the fundamental wave. Are distributed to the terminals 202 and 203. The signal of 1.5 times the frequency of the fundamental wave output to the terminal 202 and the phase of the odd harmonic of the fundamental wave are 1.5 times the frequency of the fundamental wave output to the terminal 203 and the phase of the fundamental wave. It is −90 × n degrees (n is the order of the harmonic) with respect to the phase of the odd-order harmonic.

  Of the harmonics of the fundamental wave and the odd-order harmonics of the fundamental wave output from the terminals 202 and 203 of the directional coupler 4 and the odd-order harmonics of the fundamental wave, the fifth-order or higher odd-order harmonics are filtered. 12 and the filter 13 are totally reflected respectively. Odd-order harmonics of the fifth or higher order totally reflected by the filter 12 are absorbed by the termination resistor 6 through the directional couplers 4, 3, 2. Further, the fifth and higher order odd harmonics totally reflected by the filter 13 are absorbed by the termination resistor 8 via the directional coupler 4.

  Further, among the odd-order harmonics input to the directional coupler 4, the third harmonic corresponds to twice the center frequency of the directional coupler 4 and the directional coupler 5. It goes straight without being distributed, passes through the filter 12 and is input to the directional coupler 5 through the terminal 206, and further goes straight through this directional coupler 5 and is absorbed by the terminating resistor 9 through the terminal 208. .

  On the other hand, the fundamental wave input to the directional coupler 4 is in a band that can be distributed and synthesized by the directional coupler 4 and the directional coupler 5, and is distributed by the directional coupler 4, and the filters 12 and 13 are connected. After passing through and being combined by the directional coupler 5, it is output to the output terminal 11 via the terminal 207 and transmitted.

  Thus, in the present embodiment, the even-order harmonics of the fundamental wave are absorbed by the termination resistor 7, the odd-order harmonics of the fifth or higher order are absorbed by the termination resistors 6 and 8, and the third-order harmonic is absorbed by the termination resistor. 9 is absorbed, and only the fundamental wave is output to the output terminal 11, and the reflected wave does not return to the power amplifier 1, so that the power amplifier 1 is not damaged or broken, and the filter 12, The impedance viewed from the power amplifier 1 at the harmonic frequency at which the light is totally reflected by the power amplifier 13 appears to be terminated, and the power amplifier 1 can be operated stably.

  Further, although the voltage standing wave ratio (VSWR) is poor at the frequency at which the filters 12 and 13 are totally reflected, in this embodiment, the reflected wave is absorbed by the termination resistors 6 to 9, so that the power amplifier The VSWR seen from 1 is kept good. Furthermore, since the necessary filters 12 and 13 only need to reflect odd-order harmonics of the fifth or higher order, the filter can be configured easily.

(Second Embodiment)
FIG. 2 shows a configuration diagram of a second embodiment of the high-frequency power transmission device according to the present invention. In the figure, the high-frequency power transmission device includes a power amplifier 15, directional couplers 16 to 19, termination resistors 20 to 23, an input terminal 10, and an output terminal 11. The power amplifier 15 is a power amplifier that outputs a power-amplified fundamental wave and second to fourth harmonics. The directional coupler 16 and the directional coupler 17 are directional couplers having a coupling degree of 3 dB configured by a line length of a quarter wavelength of the fundamental wave, such as a microstrip line, a strip line, and a coaxial line. Consists of a distributed constant circuit. The directional coupler 16 and the directional coupler 17 may be a broadband directional coupler having a 4/3 wavelength of the fundamental wave.

  The directional coupler 16 equally distributes the fundamental wave and the odd-order harmonics (specifically, the third-order harmonic) output from the power amplifier 15 and input via the terminal 301 to the terminal 302 and the terminal. It outputs to 303. The phase of the fundamental wave and the odd harmonic (third harmonic) output to the terminal 302 is −90 with respect to the phase of the fundamental wave and odd harmonic (third harmonic) output to the terminal 303. Xn degrees (where n is the order of the harmonic). In addition, the directional coupler 16 outputs all the input even-order harmonics (specifically, the second-order harmonic and the fourth-order harmonic) to the terminal 302. The terminal 305 is a terminal that is isolated from the terminal 301.

  The directional coupler 17 is such that the phase of the fundamental wave and the harmonic wave input from the terminal 302 is −90 × n degrees (n is the order of the harmonic wave) with respect to the phase of the fundamental wave and the odd harmonic wave input from the terminal 303. ), The fundamental wave and the odd harmonics input from the terminal 302 and the terminal 303 are combined and output to the terminal 304. The directional coupler 17 outputs all even harmonics input to the terminal 302 to the terminal 306. The terminal 306 is a terminal that is isolated from the terminal 304.

  The directional coupler 18 and the directional coupler 19 are directional couplers having a line length of 1/6 wavelength of the fundamental wave, and are distributed constant circuits such as microstrip lines, strip lines, and coaxial lines. Composed. As the directional coupler 18 and the directional coupler 19, a 3/6 wavelength broadband directional coupler may be used.

  The directional coupler 18 distributes a signal having a wavelength of 4/6 of the fundamental wave input from the terminal 401, that is, a signal having a frequency 1.5 times that of the fundamental wave and its odd-order harmonics, and the terminals 402 and 403. Output to. The signal having a frequency 1.5 times that of the fundamental wave output to the terminal 402 and the phase of the odd-order harmonic are the signal having a frequency 1.5 times that of the fundamental wave output to the terminal 403 and the odd-order signal. It is −90 × n degrees (n is the harmonic order) with respect to the phase of the harmonic. The directional coupler 18 outputs all even-order harmonics to a terminal 402 for a signal having a frequency 1.5 times the fundamental wave input to the terminal 401. The terminal 405 is a terminal that is isolated from the terminal 401.

  The directional coupler 19 has a signal having a frequency 1.5 times that of the fundamental wave input from the terminal 402 and the phase of the odd-order harmonic of the fundamental wave is 1.5 times that of the fundamental wave input from the terminal 403. When the frequency signal and the phase of the odd-order harmonic of the fundamental wave are −90 × n degrees (where n is the order of the harmonic), 1.5 of the fundamental wave input from the terminal 402 and the terminal 403. The double frequency signal and its odd harmonics are combined and output to the output terminal 11 via the terminal 404. Further, the directional coupler 19 outputs all even-order harmonics to a terminal 406 for a signal having a frequency 1.5 times the fundamental wave input from the terminal 402. The terminal 406 is a terminal that is isolated from the terminal 404.

  Terminating resistors 20-23 are resistors for terminating the isolation terminals 305, 306, 405, 406 of the directional couplers 16-19.

  Next, the operation of the embodiment of FIG. 2 will be described. The high frequency signal input to the input terminal 10 is amplified by the power amplifier 15 to output a fundamental wave and second to fourth harmonics. Of the fundamental wave and the second to fourth harmonics, which are input from the power amplifier 15 via the terminal 301 of the directional coupler 16, and the second to fourth harmonics, the second harmonics that are even harmonics and Since the fourth harmonic wave is twice the center frequency of the directional coupler 16 and the directional coupler 17, the fourth harmonic wave is not distributed and synthesized, and is not distributed but travels straight, passes through the terminal 302, and is connected to the terminal 306 of the directional coupler 17. And is absorbed by the termination resistor 21.

  On the other hand, the fundamental wave and the odd-order harmonics (specifically, the third-order harmonics) in the output signal of the power amplifier 15 are 90 × n degrees from the directional coupler 16 to the terminals 302 and 303 (n is The phase difference of the harmonic order) is distributed and outputted, and is synthesized by the directional coupler 17 and outputted to the terminal 304. Therefore, only the fundamental wave and the third harmonic are input from the directional coupler 17 to the terminal 401 of the directional coupler 18.

  Of the fundamental wave and the third harmonic input to the directional coupler 18, the third harmonic is twice the center frequency of the directional coupler 18 and the directional coupler 19. 18 is not distributed at 18 but goes straight to the terminal 402, and the directional coupler 19 also goes straight to the terminal 406 and is absorbed by the terminating resistor 23. The fundamental wave is distributed by the directional coupler 18, further synthesized by the directional coupler 19, output to the output terminal 11 via the terminal 404, and transmitted.

  In the present embodiment, it is effective when the harmonics output from the power amplifier 15 are only in the second to fourth harmonics, and the second to fourth harmonics are absorbed. The reflected wave does not return. The present embodiment has the same features as the first embodiment, and the harmonics of the power amplifier 15 are from the second to fourth harmonics, so that it is compared with the first embodiment of FIG. No filter is required and the cost can be reduced.

It is a block diagram of 1st Embodiment of the high frequency electric power transmission apparatus of this invention. It is a block diagram of 2nd Embodiment of the high frequency electric power transmission apparatus of this invention. It is a block diagram of an example of the high frequency electric power transmission apparatus of related invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 Input terminal 2-5, 16-19 Directional coupler 6-9, 20-23 Termination resistor 11 Output terminal

Claims (7)

A power amplifier that amplifies the input signal, and
A pair of first directional couplers connected in cascade, each having a line length of a predetermined first wavelength of a fundamental wave of a signal output from the power amplifier, and connected to the first directional coupler The first termination resistor is configured to output the fundamental wave and odd harmonics of the signal output from the power amplifier to the first terminal and absorb the even harmonics to the first termination resistor. One directional coupling means;
Connected to a pair of cascaded second directional couplers configured with a line length of a predetermined second wavelength of the fundamental wave of the signal output from the power amplifier, and the second directional coupler And a second termination resistor, and a fundamental wave and odd harmonics of the signal output from the power amplifier output from the first terminal of the first directional coupling means. A second directional coupling unit that terminates the odd harmonics with the second termination resistor and combines only the fundamental wave and outputs the synthesized signal from the second terminal to the output terminal. A high-frequency power transmitter. A power amplifier that amplifies the input signal, and
A pair of cascaded first directional couplers and a first directional coupling, each having a line length of ¼ wavelength or 4/3 wavelength of the fundamental wave of the signal output from the power amplifier A first termination resistor connected to the power supply unit to output a fundamental wave and an odd-order harmonic of the signal output from the power amplifier to the first terminal, and an even-order harmonic to the first termination resistor. First directional coupling means to be absorbed;
A pair of second directional couplers connected in cascade, each having a line length of 1/6 wavelength or 3/6 wavelength of the fundamental wave of the signal output from the power amplifier, and the pair of second directional couplers A filter that totally reflects a fifth-order or higher harmonic wave sandwiched between directional couplers, and a pair of second terminations respectively connected to the input side and the output side of the pair of second directional couplers A resistor, and the fundamental wave and odd harmonics of the signal output from the power amplifier output from the first terminal of the first directional coupling means have a fifth or higher order. The harmonic wave is totally reflected by the filter and absorbed by one of the pair of second termination resistors connected to the input side, and the third harmonic wave that has passed through the filter is connected to the output side. Only the fundamental wave is absorbed by the other of the pair of second terminal resistors. Synthesized high-frequency power transmitter, characterized in that a second directional coupler means for outputting to the output terminal. A power amplifier that amplifies an input signal to output a fundamental wave and second to fourth harmonics;
A pair of cascaded first directional couplers and a first directional coupling, each having a line length of ¼ wavelength or 4/3 wavelength of the fundamental wave of the signal output from the power amplifier A first terminator connected to the power supply unit to output a fundamental wave and a third harmonic of the signal output from the power amplifier to the first terminal and to transmit an even-order harmonic to the first terminator. First directional coupling means to be absorbed by
A pair of second directional couplers connected in cascade, each having a line length of 1/6 wavelength or 3/6 wavelength of the fundamental wave of the signal output from the power amplifier, and the second directionality A second termination resistor connected to the coupler, and a fundamental wave of the signal output from the power amplifier output from the first terminal of the first directional coupling means and a second Of the third harmonic, the third harmonic is terminated by the second terminating resistor, and the second directional coupling means for synthesizing only the fundamental wave and outputting it to the output terminal is provided. A high-frequency power transmitter. A power amplifier that amplifies the input signal at a saturation level; and
First and second directional couplers connected in cascade, each having a line length of ¼ wavelength of the fundamental wave of the signal output from the power amplifier, the center frequency being the same as the fundamental wave;
The first and second directional couplers go straight and absorb all even harmonics of the fundamental wave in the output signal of the power amplifier, which are all output from the second directional coupler. A termination resistor;
Receiving the fundamental wave and its odd harmonics in the output signal of the power amplifier, which are equally distributed by the first directional coupler and synthesized by the second directional coupler, as inputs; A third directional coupler having a line length of 1/6 wavelength and having a center frequency of 1.5 times the fundamental wave;
First and second filters that respectively totally reflect the fifth and higher harmonics of the fundamental wave distributed and output from the third directional coupler to two terminals;
A second termination resistor that absorbs the fifth and higher harmonics totally reflected by the first filter that is sequentially input through the third, second, and first directional couplers;
A third termination resistor that absorbs the fifth and higher harmonics totally reflected by the second filter input via the third directional coupler;
The first and second filters each receive a signal output as an input and are configured with a line length of 1/6 wavelength of the fundamental wave, and a fourth frequency whose center frequency is 1.5 times the fundamental wave. A directional coupler;
The third harmonic of the fundamental wave output straight from the fourth directional coupler by traveling straight through the third directional coupler, the first filter, and the fourth directional coupler. A fourth terminating resistor to absorb;
And the fundamental wave in the output signal of the power amplifier, which is distributed by the third directional coupler and synthesized by the fourth directional coupler, is output to an output terminal. High frequency power transmitter.   The first and second directional couplers are 4/4 wavelength broadband directional couplers of the fundamental wave instead of a line length configuration of ¼ wavelength of the fundamental wave, and the third and The fourth directional coupler is a directional coupler having a line length of 3/6 wavelength instead of a line length of 1/6 wavelength of the fundamental wave. High frequency power transmitter. A power amplifier that amplifies an input signal to output a fundamental wave and second to fourth harmonics;
First and second directional couplers connected in cascade, each having a line length of ¼ wavelength of the fundamental wave of the signal output from the power amplifier, the center frequency being the same as the fundamental wave;
The first and second directional couplers go straight and absorb all even harmonics of the fundamental wave in the output signal of the power amplifier, which are all output from the second directional coupler. A termination resistor;
Receiving the fundamental wave in the output signal of the power amplifier and the third harmonic thereof, which are equally distributed by the first directional coupler and synthesized by the second directional coupler, as an input; A third and a fourth directional coupler connected in cascade, the center frequency of which is 1.5 times the frequency of the fundamental wave,
A second termination resistor that absorbs the third harmonic of the fundamental wave, which travels straight through the third and fourth directional couplers and is all output from the fourth directional coupler;
A high-frequency power transmission device that outputs the fundamental wave in the output signal of the power amplifier, which is distributed by the third directional coupler and synthesized by the fourth directional coupler, to an output terminal. .   The first and second directional couplers are 4/4 wavelength broadband directional couplers of the fundamental wave instead of a line length configuration of ¼ wavelength of the fundamental wave, and the third and The fourth directional coupler is a directional coupler having a line length of 3/6 wavelength instead of a line length of 1/6 wavelength of the fundamental wave. High frequency power transmitter.

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