JPH0884022A - Multibeam transmission system - Google Patents

Abstract

PURPOSE: To make the output of a power amplifier uniform and to improve the reliability or a multibeam transmission system. CONSTITUTION: Plural teams are formed from primary radiators 2a to 2s cellularly arranged at the focus of a revolving parabolic reflection mirror, and a part of the primary radiator group for each beam is used to form the adjacent beams. In this multibeam transmission system of the overlap aperture feed system, one or plural output terminals of a beam forming circuit 5 are selected, and signals outputted from selected output terminals are distributed and are subjected to power amplification, and distributed and amplified signals are synthesized, The same number of hybrid synthesis type power amplifiers 12a to 12f and 13 as beams which output powers the number of which is equal to the number of inputs and which are proportional to inputs are provided and are used to supply the powers by which primary radiators 2a to 2s radiate respective beams.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-beam antenna for a mobile communication satellite which continuously covers a service area with a plurality of spot beams, and is used for improving the minimum gain in the service area. The present invention relates to a multi-beam transmission system using an aperture cluster feeding circuit.

[0002]

2. Description of the Related Art FIG. 5 is a schematic configuration diagram of an offset type multi-beam antenna which is one of reflector antennas.
In FIG. 5, reference numeral 1 is a reflecting mirror forming a part of a paraboloid of revolution, and 2 is a cluster primary radiator group composed of a plurality of horn antennas of the same size arranged near the focal point of the reflecting mirror 1, The reflecting mirror 1 converts the spherical wave radiated from the primary radiator group 2 into a plane wave.

In FIG. 6, the primary radiator group 2 shown in FIG.
It is the conventional primary radiator arrangement | positioning figure seen from the side, and in order to simplify description, the case where seven beams are formed by 19 circular aperture horn type | mold primary radiators is described. Each beam is fed by a horn cluster composed of seven primary radiators. That is, in FIG. 6, the horn cluster 31 for the first beam includes the primary radiators 2a, 2b, 2
c, 2f, 2j, 2r, 2s, and the horn cluster 32 for the second beam includes primary radiators 2b, 2c, 2
d, 2e, 2f, 2i, 2j, and the horn cluster 33 for the third beam includes primary radiators 2e, 2f, 2
g, 2h, 2i, 2j, 2m, and the horn cluster 34 for the fourth beam includes primary radiators 2c, 2f, 2
i, 2j, 2m, 2p, 2s, and the horn cluster 35 for the fifth beam includes primary radiators 2h, 2i, 2
j, 2k, 2l, 2m, 2p, and the horn cluster 36 for the sixth beam is a primary radiator 2j, 2m, 2
1, 2n, 2o, 2p, 2s, and the horn cluster 37 for the seventh beam is a primary radiator 2c, 2
j, 2o, 2p, 2q, 2r, 2s. Here, the horn clusters 31 to 37 for each beam share a part of the primary radiator. For example, in the horn cluster 31 for the first beam and the horn cluster 32 for the second beam, the primary radiators 2b, 2c, 2f, 2j are shared.
Such a feeder circuit sharing a part of the primary radiator is called an overlapping aperture feeder.

FIG. 7 shows a power supply circuit for realizing the above-mentioned double aperture power supply system and shows a transmission system. In FIG. 7, 2a to 2s are primary radiators, 3a to 3s are power amplifiers (HPA), 4a to 4s are bandpass filters, and 5 is a beam forming circuit (BFN). Beam forming circuit 5
Are signal input terminals 11a for the first to seventh beams
Dividers 6a to 6g for dividing each high-frequency signal input from 11g into seven, and amplitude / phase correction circuits 7a to 7
f, combiners 8a to 8f for 2 synthesis, combiners 9a to 9f for 4 synthesis, and combiner 10 for 7 synthesis
Is provided.

In the transmission system configured as described above, the high frequency signal input to the divider 6a from the signal input terminal 11a for the first beam is equally divided into 7 by the divider 6a, and the amplitude is adjusted. Each of the divided high frequency signals has an amplitude / phase correction circuit 7a and combiners 8a, 9a, 9b, 10, 8f,
Input to 9f. The signals for the first beam input to the respective amplitude / phase correction circuits 7a and the combiners 8a, 9a, 9b, 10, 8f, 9f are combined with the signals of the other beams divided by the other dividers, and further, the signals of the dividers are combined. After the amplitude and the phase are corrected to be the same as the distribution ratio, the respective power amplifiers 3a, 3b, 3c, 3f, 3j, 3
The power is amplified by r and 3s. The power-amplified signals are supplied to the respective bandpass filters 4a, 4b, 4c, 4
After being band-pass filtered by f, 4j, 4r and 4s and removing spurious components, they are input to the corresponding primary radiators 2a, 2b, 2c, 2f, 2j, 2r and 2s for the first beam, respectively.

The high frequency signal input to the divider 6b from the signal input terminal 11b for the second beam is the divider 6b.
Are evenly divided into 7 and the amplitude is adjusted. Each of the divided high-frequency signals has an amplitude / phase correction circuit 7b and a combiner 8a,
9a, 8b, 9b, 9c and 10 are input. These amplitude / phase correction circuits 7b and combiners 8a, 9a, 8b,
The signals for the second beam input to 9b, 9c, and 10 are combined with the signals of the other beams divided by the other dividers, and the amplitude and phase are corrected to be the same as the divider distribution ratio. After that, each power amplifier 3b, 3
The power is amplified by c, 3d, 3e, 3f, 3i and 3j.
The power-amplified signals are band-pass filtered by the respective band-pass filters 4b, 4c, 4d, 4e, 4f, 4i, 4j and, after removing spurious components, the corresponding primary radiator for the second beam. 2b, 2c, 2d, 2
e, 2f, 2i, 2j, respectively.

The high frequency signal input to the divider 6c from the signal input terminal 11c for the third beam is the divider 6c.
Are evenly divided into 7 and the amplitude is adjusted. Each of the divided high-frequency signals has an amplitude / phase correction circuit 7c and a combiner 8b,
9b, 8c, 9c, 10, 9d. The amplitude / phase correction circuit 7c and the combiners 8b, 9b, 8c,
The signals for the third beam input to 9c, 10, and 9d are combined with the signals of the other beams divided by the other dividers, and the amplitude and phase are corrected to be the same as the distribution ratio of the dividers. After that, each power amplifier 3e, 3
The power is amplified by f, 3g, 3h, 3i, 3j, and 3m.
The power-amplified signals are band-pass filtered by respective band-pass filters 4e, 4f, 4g, 4h, 4i, 4j, and 4m, and spurious components are removed. 2e, 2f, 2g, 2
It is input to h, 2i, 2j, and 2m, respectively.

The high frequency signal input to the divider 6d from the signal input terminal 11d for the fourth beam is the divider 6d.
Are evenly divided into 7 and the amplitude is adjusted. The divided high-frequency signals are combined by the combiners 9a, 9b, 9c, 10, 9d,
9e and 9f are input. These combiners 9a, 9
The signals for the fourth beam input to b, 9c, 10, 9d, 9e, and 9f are combined with the signals of the other beams divided by the other dividers, and the amplitude is adjusted so as to be the same as the divider distribution ratio. After the phase is corrected, the power is amplified by the respective power amplifiers 3c, 3f, 3i, 3j, 3m, 3p, 3s. The power-amplified signals are supplied to the bandpass filters 4c, 4f, 4i, 4j, 4m, 4 respectively.
After being band-pass filtered by p, 4s and removing spurious components, the corresponding primary radiator 2c for the fourth beam,
It is input to 2f, 2i, 2j, 2m, 2p and 2s, respectively.

The high frequency signal input to the divider 6e from the signal input terminal 11e for the fifth beam is the divider 6e.
Are evenly divided into 7 and the amplitude is adjusted. Each of the divided high-frequency signals has an amplitude / phase correction circuit 7d and a combiner 8c,
9c, 10, 8d, 9d and 9e are input. Each of the amplitude / phase correction circuits 7d and the combiners 8c, 9c, 10,
The signals for the fifth beam input to 8d, 9d, and 9e are combined with the signals of the other beams divided by the other dividers, and the amplitude and phase are corrected to be the same as the divider distribution ratio. After that, each power amplifier 3h, 3
The power is amplified by i, 3j, 3k, 3l, 3m, 3p.
The power-amplified signals are band-pass filtered by respective band-pass filters 4h, 4i, 4j, 4k, 4l, 4m, and 4p, and after removing spurious components, the corresponding primary radiators for the fourth beam. 2h, 2i, 2j, 2
It is input to k, 2l, 2m, and 2p, respectively.

The high frequency signal input to the divider 6f from the signal input terminal 11f for the sixth beam is the divider 6f.
Are evenly divided into 7 and the amplitude is adjusted. Each of the divided high-frequency signals has an amplitude / phase correction circuit 7e and a combiner 10,
It is input to 8d, 9d, 8e, 9e and 9f. Each of the amplitude / phase correction circuits 7e and the combiners 10, 8d, 9d,
The signals for the sixth beam input to 8e, 9e, and 9f are combined with the signals of the other beams divided by the other dividers, and the amplitude and phase are corrected to be the same as the divider distribution ratio. After that, each power amplifier 3j, 3
The power is amplified by 1, 3m, 3n, 3o, 3p and 3s.
The power-amplified signals are band-pass filtered by the respective band-pass filters 4j, 4l, 4m, 4n, 4o, 4p, 4s, and after removing spurious components, the corresponding primary radiator for the fourth beam. 2j, 2l, 2m, 2
It is input to n, 2o, 2p, and 2s, respectively.

The high frequency signal input to the divider 6g from the signal input terminal 11g for the seventh beam is the divider 6g.
Are evenly divided into 7 and the amplitude is adjusted. Each of the divided high-frequency signals has an amplitude / phase correction circuit 7f and a combiner 9a,
It is input to 10, 8e, 9e, 8f, 9f. The amplitude / phase correction circuit 7f and the combiners 9a, 10, 8e,
The signals for the seventh beam input to 9e, 8f, and 9f are combined with the signals of the other beams divided by the other dividers, and the amplitude and phase are corrected to be the same as the distribution ratio of the dividers. After that, each power amplifier 3c, 3
The power is amplified by j, 3o, 3p, 3q, 3r and 3s.
The power-amplified signals are band-pass filtered by the respective band-pass filters 4c, 4j, 4o, 4p, 4q, 4r, 4s, and after removing spurious components, the corresponding primary radiator for the fourth beam is generated. 2c, 2j, 2o, 2
It is input to p, 2q, 2r, and 2s, respectively.

The high frequency signal input to the primary radiator 2 of the horn cluster by such a feeding circuit becomes a spherical wave and is radiated to the reflecting mirror 1. The reflecting mirror 1 converts a spherical wave into a plane wave and re-emits it. This plane wave becomes a spot beam at a distance. Here, the beams from a plurality of primary radiators are emitted in slightly different directions depending on their positions, but since the seven primary radiators are arranged close to each other, it is as if one primary radiator were arranged. It makes the same movement as the radiator to form one spot beam. Moreover, since the four primary radiators that overlap each other are shared between adjacent beams,
The arrangement of the primary radiators shown in FIG. 6 is apparently similar to the arrangement of the openings of the seven primary radiators overlapping each other, whereby the seven spot beams partially overlapped with each other. To form. For this reason, a multibeam antenna that needs to continuously cover a wide service area, such as mobile satellite communication, has the advantage of reducing the gain deviation between beams.

[0013]

Problems to be solved by the conventional method will be described below. As shown in FIG. 6, the primary radiators constituting the multi-beam antenna are arranged in a cellular configuration adjacent to each other, and one horn cluster is centered on one primary radiator and has six horn clusters around it. It is composed of seven primary radiators arranged so as to circumscribe the primary radiators. The excitation distribution of the feed in such a horn cluster is generally different between the primary radiator in the center and the primary radiator in the periphery from the viewpoint of reducing side lobes.
Here, the power ratio between the central primary radiator and the peripheral primary radiator is 1.0: 0.2, and the phases are the same. Now, if the required transmission power of each beam is made the same, the relative power supplied to each of the primary radiators 3a to 3s becomes a value as shown in FIG. That is, the input power of each power amplifier has a relative value of 0.2 to 2.2, and the maximum output of each power amplifier also requires transmission power proportional to this. Therefore, each power amplifier requires a different design of maximum output, and with such a power amplifier, the failure of one power amplifier results in a corresponding loss of radiated power from one primary radiator. Therefore, there is a problem in that the reliability of the multi-beam transmission system is reduced.

The present invention has been made in view of the above points, and an object of the present invention is to provide a multi-beam transmission system capable of uniformizing the output of a power amplifier and improving reliability.

[0015]

In order to achieve the above object, the invention of claim 1 is such that a large number of primary radiators having the same aperture size are arranged in a planar cellular manner at the focal portion of a rotating parabolic reflector. Then, a plurality of sets of beams formed by using a plurality of primary radiators adjacent to each other in this array are provided, and a part of the primary radiator group forming each beam is shared for the formation of adjacent beams. In the multi-beam transmission system of the overlapping aperture feeding system, each high-frequency signal corresponding to each beam is divided into a number according to the number of primary radiators of the primary radiator group forming each beam, and the amplitude and phase are corrected. Along with the total number of the primary radiators, an output terminal for outputting a signal of a power level corresponding to the arrangement position of the primary radiators of the primary radiator group by synthesizing predetermined signals of the divided beams To have Beam forming circuit and a signal of a power level necessary for exciting each primary radiator of each primary radiator group are selected from each output terminal of the beam forming circuit, and the selected signal is distributed and power amplified. At the same time, the hybrid-combined power amplifiers are provided in the same number as the number of beams, which outputs the same number of output powers as the number of inputs proportional to the input by combining the distributed and amplified signals.

According to a second aspect of the present invention, the total number of output terminals of all the hybrid combining type power amplifiers is made the same as the total number of the primary radiators. According to a third aspect of the present invention, the hybrid power distribution unit includes n stages of hybrid power distribution units that distribute the input signal to 2 ⁿ , which is larger than the number of primary radiators forming one beam, and the hybrid power distribution unit. 2 ⁿ unit power amplifiers for individually amplifying each power distributed in step n, and n for combining each power amplified by each of the unit power amplifiers to a number corresponding to the number of input signals and outputting n
It is composed of a hybrid power combining unit of stages. According to a fourth aspect of the present invention, when the total power supplied to each beam by the primary radiator group is the same, the total output power of the output terminals of the hybrid combining type power amplifiers is the same. .

[0017]

According to the present invention, since the total output power of each hybrid combining type power amplifier is the same and the output of each unit power amplifier constituting each hybrid combining type power amplifier is also the same, the hybrids of substantially the same design. A unit power amplifier of the same design as the combined power amplifier can be applied, so that even if a part of the unit power amplifier fails,
Only the maximum output of the hybrid combining type power amplifier is slightly decreased, and the operation of the multi-beam transmission system is not hindered, and the reliability of the multi-beam transmission system can be improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit configuration diagram of a multi-beam transmission system using an overlapping aperture feeding system according to the present invention, and a case where seven beams are formed by 19 circular aperture horn type primary radiators will be described. In FIG. 1, the same components as those in FIG. 7 are designated by the same reference numerals, and 2a to 2s are 7
As shown in FIG. 6, all of the primary radiators 2a to 2s are primary radiators that radiate two multi-beams, and the primary radiators 2a to 2s radiate the first to seventh beams, respectively. Each cluster primary radiator group is composed of seven primary radiators, each of which is centered around one primary radiator and arranged so that six primary radiators are circumscribed around the primary radiator. Further, 4a to 4s are primary radiators 2a to 2s, respectively.
Band-pass filter 5 is a beam forming circuit for forming seven multi-beams, and this beam forming circuit 5 includes signal input terminals 11a for the first to seventh beams.
Dividers 6a to 6g for dividing each high-frequency signal input from ˜11g into 7 and amplitude / phase correction circuit 7a to
7f, combiners 8a to 8f for 2 synthesis, combiners 9a to 9f for 4 synthesis, and combiner 1 for 7 synthesis
0, each of the high-frequency signals divided into 7 by each of the dividers 6a to 6g has amplitude / phase correction circuits 7a to 7f and a combiner 8 for combining 2 according to the connection relationship shown in FIG.
a to 8f, 4 combiners 9a to 9f for synthesis, and 7 combiner 10 for synthesis.

In FIG. 1, 12a to 12f are 3 inputs 3
Output hybrid hybrid power amplifier, 13 is 1 input 1
It is an output hybrid combined power amplifier, and these hybrid combined power amplifiers show the characteristic part of this embodiment. The 1-input / 1-output hybrid combining type power amplifier 13 is connected between the output terminal j of the beam forming circuit 5 and the bandpass filter 4j of the primary radiator 2j. Further, as shown in FIG. 2, the 1-input 1-output hybrid combining type power amplifier 13 has input terminals by connecting hybrid type power distributors 14a to 14g, which divide the input power into two equal parts, in three stages. 13a, a power distribution unit 14 that divides the input power input into 8 equal parts, and this power distribution unit 14
Of the hybrid type power distributors, the eight unit power amplifiers 15a to 15h for individually amplifying the two output powers of the hybrid type power distributors 14d to 14g and the output power of the unit power amplifiers 15a to 15h are combined. The hybrid type power combiners 16a to 16g are connected in three stages in cascade to form a power combiner 16 that combines the outputs into one output, and the one output power is output to the output terminal 13b.

The three-input, three-output hybrid combining type power amplifier 12a comprises the output terminals a to c of the boom forming circuit 5.
Connected to the bandpass filters 4a to 4c, and the hybrid input power amplifier 12b having three inputs and three outputs is connected to the output terminals d to f of the boom forming circuit 5 and the bandpass filter 4.
The hybrid combining type power amplifier 12c having three inputs and three outputs, which is connected between d to 4f, is connected between the output terminals g to i of the boom forming circuit 5 and the band pass filters 4g to 4i,
Hybrid input type power amplifier 12d with 3 inputs and 3 outputs
Is connected between the output terminals k to m of the boom forming circuit 5 and the bandpass filters 4k to 4m, and the 3-input / 3-output hybrid combined power amplifier 12e is connected to the output terminals n to p of the boom forming circuit 5 and the bandpass filter. The hybrid combining type power amplifier 12f having three inputs and three outputs, which is connected between the filters 4n to 4p, is connected between the output terminals q to s of the boom forming circuit 5 and the band pass filters 4q to 4s.

As shown in FIG. 3, each of the three-input, three-output hybrid combining type power amplifiers 12a-12f is a hybrid type power distributor 1 for dividing the input power into two equal parts.
By connecting 7a to 17h in three stages in cascade, a power distribution unit 17 that divides three input powers input from the input terminals 20a to 20c into 8 equal parts and a hybrid type power distributor of the power distribution unit 17 Hybrid type power distributor 17
Eight unit power amplifiers 18a to 18h for individually amplifying two output powers of d to 17g and hybrid power combiners 19a to 19h for combining output powers of the unit power amplifiers 18a to 18h are cascaded in three stages. It is configured with a power combiner 19 that combines the three outputs by being connected, and the three output powers are output to the output terminals 21a to 21c.

Next, the operation of the present embodiment configured as described above will be described for the case of emitting the first beam. In FIG. 1, the high frequency signal input to the input terminal 11a of the first beam is equally divided into seven by the divider 6a, and the amplitude is adjusted. Each of the divided high-frequency signals is composed of an amplitude / phase correction circuit 7a, two combiners 8a, 8f,
It is input to the four-combining combiners 9a, 9b, 9f and the seven-combining combiner 10. Further, the amplitude / phase correction circuit 7a
And the divided signals for the first beam input to the combiners 8a, 8f, 9a, 9b, 9f and 10 are corrected so that the combined loss and the phase become the same as the output distribution ratio of the divider, and the beam forming circuit. 5 output terminals a, b, c, f,
It is output to j, r, and s. These output terminals a, b, c,
The output signals output to f, j, r, and s are amplified by the hybrid combining type power amplifiers 12a, 12b, 13, 12d, and 12f connected to the output terminals thereof. The power-amplified signals are band-pass filtered by the respective band-pass filters 4a, 4b, 4c, 4f, 4j, 4r, 4s, and after removing spurious components, the corresponding primary radiators for the first beam. 2a, 2b, 2
c, 2f, 2j, 2r, 2s, respectively. As a result, the first beam is fed.

Here, the signals input to the input terminals 20a of the hybrid input power amplifiers 12a, 12b, 12d, and 12f of three inputs and three outputs, that is, the input power, are the output terminals 21 due to the nature of the hybrid power amplifiers.
It is output to a and does not appear at other output terminals. Moreover, if the operation mode of the hybrid combined power amplifier is a linear operation with an output backoff of about 3 dB, its input and output are in a proportional relationship. Therefore, each signal from the plurality of input terminals is output to the corresponding output terminal in proportion to the input. Therefore, the hybrid combined power amplifier functions as if a plurality of unit amplifiers exist independently.

The hybrid combining type power amplifiers corresponding to the other second to seventh beams also emit the first to seventh beams because they have the same functions as those of the first beam. The excitation distribution of each cluster primary radiator group is the same as the conventional feeding method.

FIG. 4 shows the power distribution state of the transmission system in this embodiment. In the transmission system of this embodiment, assuming that the relationship between the first to seventh beams and the output levels of the output terminals a to s of the beam forming circuit 5 is the same as in the conventional transmission system, each hybrid combining type power amplifier 12a. ~ 12
The input power levels of f and 13 are as shown in FIG.
As is apparent from FIG. 4, the total input powers of the hybrid combined power amplifiers 12a to 12f, 13 are all the same. Therefore, the output powers of the hybrid combined power amplifiers 12a to 12f and 13 are all the same.
Therefore, the hybrid combined power amplifiers are different only in the number of input / output terminals, and each hybrid combined power amplifier can be composed of the same number of unit power amplifiers having the same maximum output.

As shown in FIGS. 2 and 3, the hybrid combination type power amplifier applied to the multi-beam transmission system of this embodiment has eight unit amplifiers and three stages provided at the input and output thereof. And the number of hybrid stages on the input and output sides of this hybrid combining type power amplifier is changed to 1 input to 8 outputs.
It becomes a multi-terminal power amplifier up to the output, and this power amplifier is isolated between the input terminals and between the output terminals, and moreover, the input and output of the specific input terminal and the corresponding output terminal are It corresponds. Therefore,
The hybrid combined power amplifier functions as if the same number of unit power amplifiers as the input terminals or output terminals are lined up, and the signal input to a certain input terminal is the unit power of all the hybrid combined power amplifiers. It will be amplified with the same power by the amplifier.

Further, even if the unit power amplifier in the hybrid combining type power amplifier fails, the unit combining power amplifier also provides isolation, so that the maximum output of the hybrid combining type power amplifier is reduced, but the hybrid combining type power amplifier is reduced. The power amplifier can be operated continuously.
As a result, unlike the conventional case, there is no problem that the radiation power from one primary radiator is lost due to the failure of one power amplifier, and the reliability of the transmission system can be improved.

In the above embodiment, the case where eight unit power amplifiers are used as the hybrid combination type power amplifier has been described, but the present invention is not limited to this, and the maximum number of input / output terminals is three, respectively. In the case of the number of units, a hybrid combining type power amplifier using four unit power amplifiers may be used. Further, it goes without saying that the number of unit power amplifiers may be 16, 32 or the like, which is a multiple of 2 times. Further, in the above embodiment, the case where one beam is fed by seven primary radiators has been described, but the present invention is not limited to this, and the number of beams, the arrangement form of unit primary radiators, and the primary beam forming one beam. Even if the number of radiators changes, the total output of the hybrid combined power amplifier can be made the same by changing the number of input / output terminals of the hybrid combined power amplifier and selecting the combination of terminals.

[0029]

As described above, according to the present invention, a large number of primary radiators having the same aperture size are arranged in a planar cellular manner in a focal portion of a rotating parabolic reflector, and adjacent to each other in this arrangement. A multi-beam transmission system of an overlapping aperture feeding system in which a plurality of sets of beams formed by using a plurality of primary radiators are provided, and a part of a group of primary radiators forming each beam is shared for forming adjacent beams. In the above, each high-frequency signal corresponding to each beam is divided into a number according to the number of primary radiators of the primary radiator group forming each beam to correct the amplitude and phase, and a predetermined value of each of the divided beams is determined. A beam forming circuit having a number of output terminals corresponding to the total number of the primary radiators for outputting signals of power levels according to the arrangement positions of the respective primary radiators of the primary radiator group by combining the signals of each A signal having a power level required for exciting each primary radiator of the secondary radiator group is selected from each output terminal of the beam forming circuit, the selected signal is distributed and power amplified, and the distributed amplified signal is selected. The hybrid combining type power amplifier is composed of the same number of beams as the number of beams that are combined and output the same number of output powers as the number of inputs.

The present invention also provides an n-stage hybrid power distribution unit for distributing the input signal to 2 ⁿ , which is larger than the number of primary radiators forming one beam, of the hybrid combined power amplifier, and the hybrid power. 2 ⁿ unit power amplifiers that individually amplify each power distributed by the distribution unit,
The hybrid power combiner has n stages of combining the powers amplified by the unit power amplifiers into a number corresponding to the number of input signals and outputting the combined power.

Further, according to the present invention, when the total power supplied to each beam by the primary radiator group is the same, the total output power of the output terminals of each hybrid combining type power amplifier is the same.

Therefore, according to the present invention, the total output power of each hybrid combining type power amplifier becomes the same, and the output of each unit power amplifier constituting each hybrid combining type power amplifier also becomes the same, and substantially the same design. A unit power amplifier having the same design as that of the hybrid combining type power amplifier can be applied. Therefore, even if a part of the unit power amplifier fails, the maximum output of the hybrid combining type power amplifier is slightly reduced, and multi-beam transmission is performed. The operation of the system is not hindered, and the reliability of the multi-beam transmission system can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a power supply circuit of a multi-beam transmission system according to the present invention.

FIG. 2 is a block diagram showing a configuration of a 1-input 1-output hybrid combining type power amplifier in the present embodiment.

FIG. 3 is a block diagram showing a configuration of a 3-input 3-output hybrid combining type power amplifier in the present embodiment.

FIG. 4 is a diagram showing a power distribution of a transmission system in the present embodiment.

FIG. 5 is a schematic configuration diagram of an Otto feed type multi-beam antenna.

FIG. 6 is an array diagram of a group of primary radiators forming a multi-beam.

FIG. 7 is a configuration diagram of a conventional power supply circuit of a multi-beam transmission system.

FIG. 8 is a diagram showing a conventional power distribution of a transmission system.

[Explanation of symbols]

1 Reflector 2 Primary radiator group 2a to 2s Primary radiator 4a to 4s Bandpass filter 5 Beam forming circuit 6a to 6g Divider 7a to 7f Amplitude and phase correction line 8a to 8f Combiner 9a to 9f Combiner 10 Combiner 11a to 11g Input terminal a to s output terminal 12a to 12f 3 input 3 output hybrid combined power amplifier 13 1 input 1 output hybrid combined power amplifier 14a to 14g hybrid type power distributor 15a to 15h unit power amplifier 16a to 16g hybrid type power distributor 17a -17h Hybrid type power distributor 18a-18h Unit power amplifier 19a-19h Hybrid type power distributor 20a-20c Input terminal 21a-21c Output terminal 31 First beam horn cluster 32 Second beam horn cluster 3 Third beam horn cluster 34 fourth beam horn cluster 35 fifth beam horn cluster 36 sixth beam horn cluster 37 seventh beam horn cluster

Claims (4)

[Claims] 1. A plurality of primary radiators having the same aperture size are arranged in a planar cellular manner in a focal portion of a rotating parabolic reflector,
A plurality of sets of beams formed by using a plurality of primary radiators adjacent to each other in this array are provided, and a part of a group of primary radiators forming each beam is shared to form adjacent beams. In the multi-beam transmission system of the feeding system, each high-frequency signal corresponding to each beam is divided into a number according to the number of primary radiators of the primary radiator group forming each beam, and the amplitude and phase are corrected. A number of output terminals corresponding to the total number of the primary radiators, each of which outputs a signal of a power level corresponding to an arrangement position of each primary radiator of the primary radiator group by combining predetermined signals of the divided beams. A beam forming circuit having the same, and selecting a signal of a power level necessary for exciting each primary radiator of each primary radiator group from each output terminal of the beam forming circuit, distributing the selected signal, and outputting the selected signal. Multi-beam transmission system amplifies become equipped with the beam as many hybrid synthetic power amplifier to output the same number of output power and input number that is proportional to the input by combining the signals the distributed amplification,. 2. The multi-beam transmission system according to claim 1, wherein the total number of output terminals of all the hybrid combining type power amplifiers is the same as the total number of the primary radiators. 3. The hybrid combining type power amplifier,
An n-stage hybrid power distribution unit that distributes an input signal into 2 ⁿ , which is larger than the number of primary radiators forming one beam,
2 ⁿ unit power amplifiers for individually amplifying each power distributed by the hybrid power distribution unit, and each power amplified by each unit power amplifier are combined into a number corresponding to the number of input signals and output. The multi-beam transmission system according to claim 1, comprising n stages of hybrid power combining units. 4. The total output power of the output terminals of each of the hybrid combining type power amplifiers is set to be the same when the total power supplied to each beam by the primary radiator group is set to be the same. The described multi-beam transmission system.