Array antenna device

Abstract

To obtain an array antenna device capable of suppressing double waves without increasing the size.SOLUTION: An array antenna device 1 includes a plurality of transmitters 2 arranged in parallel, a plurality of polarization switches 3, and a plurality of antennas 4. Each of the plurality of transmitters 2 includes a first output terminal 26, a transmission line 27, and a second output terminal 28 connected to the transmission line 27. The electrical length of the transmission line 27 is adjusted to 1 / 4 of the wavelength of the fundamental wave. In one example, in the transmitters 2 arranged in the odd-numbered rows, the first output terminal 26 is connected to the horizontal terminal H of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the vertical terminal V of the corresponding polarization switcher 3, and in the transmitters 2 arranged in the even-numbered rows, the first output terminal 26 is connected to the vertical terminal V of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the horizontal terminal H of the corresponding polarization switcher 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an array antenna device. [Background technology]

[0002] An array antenna device is composed of multiple transmitters. In the amplifiers and switches of each transmitter, a double wave is output when a signal passes through due to nonlinear operation, and the double wave is output from the antenna.

[0003] Patent Document 1 discloses a technique for disposing a bandpass filter between an amplifier and an antenna in order to suppress a second harmonic generated in the amplifier. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-64624 A Summary of the Invention [Problem to be solved by the invention]

[0005] The technique disclosed in Patent Document 1 requires a bandpass filter, which results in a problem of a large size of the array antenna device.

[0006] The present disclosure has been made in consideration of the above, and has an object to provide an array antenna device that can suppress second harmonic waves without increasing in size. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, an array antenna apparatus according to the present disclosure includes a plurality of transmitters, a plurality of polarization switches, and a plurality of antennas arranged in parallel. A corresponding one of the plurality of polarization switches is connected to each of the plurality of transmitters. A corresponding one of the plurality of antennas is connected to each of the plurality of polarization switches. Each of the plurality of transmitters includes an input terminal, a phase shifter, an amplifier, a switch, a first output terminal connected to a first end of the switch, a transmission line connected to a second end of the switch, and a second output terminal connected to the transmission line. The input terminal, the phase shifter, the amplifier, and the switch are connected in the order of the input terminal, the phase shifter, the amplifier, and the switch. The electrical length of the transmission line is adjusted to 1 / 4 of the wavelength of the fundamental wave. Regarding the connection between each of the multiple transmitters and the corresponding polarization switch, in the transmitters arranged in the odd-numbered rows among the multiple transmitters, the first output terminal is connected to the horizontal terminal of the corresponding polarization switch, and the second output terminal is connected to the vertical terminal of the corresponding polarization switch, and in the transmitters arranged in the even-numbered rows among the multiple transmitters, the first output terminal is connected to the vertical terminal of the corresponding polarization switch, and the second output terminal is connected to the horizontal terminal of the corresponding polarization switch. Or, in the transmitters arranged in the even-numbered rows among the multiple transmitters, the first output terminal is connected to the horizontal terminal of the corresponding polarization switch, and the second output terminal is connected to the vertical terminal of the corresponding polarization switch, and in the transmitters arranged in the odd-numbered rows among the multiple transmitters, the first output terminal is connected to the vertical terminal of the corresponding polarization switch, and the second output terminal is connected to the horizontal terminal of the corresponding polarization switch. The double wave output from the transmitters in the odd-numbered rows and the double wave output from the transmitters in the even-numbered rows cancel each other out and are suppressed. Effect of the Invention

[0008] The array antenna apparatus according to the present disclosure has an advantage in that it is possible to suppress second harmonic waves without increasing the size. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 shows a configuration of an array antenna apparatus according to an embodiment. [Diagram 2] FIG. 1 is a diagram for explaining the operation of the array antenna apparatus according to the embodiment. [Diagram 3] FIG. 13 is a diagram showing a configuration of a transmitter according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Array antenna apparatuses according to embodiments will be described below in detail with reference to the drawings.

[0011] Embodiment First, the configuration of an array antenna device 1 according to an embodiment will be described. FIG. 1 is a diagram showing the configuration of the array antenna device 1 according to an embodiment. The array antenna device 1 has a plurality of transmitters 2, a plurality of polarization switches 3, and a plurality of antennas 4 arranged in parallel. The number of transmitters 2, the number of polarization switches 3, and the number of antennas 4 are the same. In FIG. 1, the polarization switcher 3 is written as POL3. A corresponding one of the plurality of polarization switchers 3 is connected to each of the plurality of transmitters 2. A corresponding one of the plurality of antennas 4 is connected to each of the plurality of polarization switchers 3.

[0012] Each of the multiple transmitters 2 has an input terminal 21, a phase shifter 22 connected to the input terminal 21, a first amplifier 23 connected to the phase shifter 22, a second amplifier 24 connected to the first amplifier 23, and a switch 25 connected to the second amplifier 24. In Fig. 1, the switch 25 is written as SW25. That is, in each of the multiple transmitters 2, the input terminal 21, the phase shifter 22, the first amplifier 23, the second amplifier 24, and the switch 25 are connected in this order.

[0013] Each of the multiple transmitters 2 further has a first output terminal 26 connected to a first end of the switch 25, a transmission line 27 connected to a second end of the switch 25, and a second output terminal 28 connected to the transmission line 27. In other words, the switch 25 is connected to the first output terminal 26 and the second output terminal 28, and the transmission line 27 is disposed between the second end of the switch 25 and the second output terminal 28.

[0014] The electrical length of the transmission line 27 is adjusted to ¼ of the wavelength of the fundamental wave, which is ½ of the wavelength of the double wave.

[0015] Each of the multiple polarization switchers 3 has a horizontal terminal H and a vertical terminal V as input terminals. Regarding the connection between each of the multiple transmitters 2 and the corresponding polarization switcher 3, in the transmitters 2 arranged in the odd-numbered columns among the multiple transmitters 2, the first output terminal 26 is connected to the horizontal terminal H of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the vertical terminal V of the corresponding polarization switcher 3. In the transmitters 2 arranged in the even-numbered columns among the multiple transmitters 2, the first output terminal 26 is connected to the vertical terminal V of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the horizontal terminal H of the corresponding polarization switcher 3.

[0016] Next, the operation of the array antenna device 1 according to the embodiment will be described. FIG. 2 is a diagram for explaining the operation of the array antenna device 1 according to the embodiment. The array antenna device 1 switches between a polarized wave corresponding to a signal input to the horizontal terminal H of the polarization switcher 3 and a polarized wave corresponding to a signal input to the vertical terminal V, and transmits the switched wave. When the array antenna device 1 outputs a polarized wave corresponding to a signal input to the horizontal terminal H of the polarization switcher 3 from the antenna 4, the transmitter 2 arranged in the odd-numbered row switches the switch 25 to the first output terminal 26, and the transmitter 2 arranged in the even-numbered row switches the switch 25 to the second output terminal 28. At this time, the phase shifter 22 of the transmitter 2 arranged in the even-numbered row advances the phase by λ / 4 in electrical length with respect to the frequency f of the fundamental wave. λ is the wavelength of the fundamental wave. The desired wave shown in FIG. 2 is the fundamental wave.

[0017] In the transmitter 2 arranged in the odd-numbered row, when a fundamental wave is input, a double wave is generated in the first amplifier 23, the second amplifier 24 and the switch 25, and the generated double wave passes through the first output terminal 26 and the horizontal terminal H of the polarization switcher 3 to be output from the antenna 4.

[0018] When a fundamental wave is input to a transmitter 2 arranged in an even-numbered row, the phase is advanced by λ / 4 in phase shifter 22, and then a double wave is generated in first amplifier 23, second amplifier 24, and switch 25. When the fundamental wave passes through switch 25 and then transmission line 27, the fundamental wave is delayed in phase by λ / 4, and the double wave is delayed in phase by λ / 2. As the phase of the fundamental wave is advanced by λ / 4 in phase shifter 22 before it is input to transmission line 27, the phase at the output end of transmitter 2 arranged in an even-numbered row after the fundamental wave has passed through transmission line 27 is the same as the phase at the output end of transmitter 2 arranged in an odd-numbered row.

[0019] As for the double wave, since the phase is delayed by λ / 2 in the transmission line 27, the phase at the output end of the transmitter 2 arranged in the even-numbered rows is shifted by a half wavelength from the phase at the output end of the transmitter 2 arranged in the odd-numbered rows. As for the double wave of the signal that passes through the horizontal terminal H of the polarization switcher 3 and is output from the antenna 4, the phase of the signal from the transmitter 2 arranged in the odd-numbered rows is shifted by a half wavelength from the phase of the signal from the transmitter 2 arranged in the even-numbered rows, so that the signals from the transmitters 2 arranged in the odd-numbered rows and the signals from the transmitters 2 arranged in the even-numbered rows cancel each other out through spatial synthesis, and an effect is obtained in which the signal is not output to the outside of the array antenna device 1.

[0020] For a signal corresponding to the signal input to the vertical terminal V of the polarization switch 3 and output from the polarization switch 3, the same effect as that described above can be obtained by switching the switch 25 of the transmitter 2 to the opposite side and leading the phase by λ / 4 in electrical length with respect to the fundamental wave frequency f in the phase shifters 22 of the transmitters 2 arranged in the odd-numbered rows.

[0021] As described above, in the array antenna device 1 according to the embodiment, the transmission line 27 is disposed between the second end of the switch 25 and the second output terminal 28. Regarding the connection between each of the plurality of transmitters 2 and the corresponding polarization switcher 3, in the transmitter 2 disposed in the odd-numbered row among the plurality of transmitters 2, the first output terminal 26 is connected to the horizontal terminal H of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the vertical terminal V of the corresponding polarization switcher 3. In the transmitter 2 disposed in the even-numbered row among the plurality of transmitters 2, the first output terminal 26 is connected to the vertical terminal V of the corresponding polarization switcher 3, and the second output terminal 28 is connected to the horizontal terminal H of the corresponding polarization switcher 3. In the above-described configuration, by switching the switch 25 and adjusting the phase shifter 22, a bandpass filter for suppressing the second harmonic is not required, and the array antenna device 1 can suppress the second harmonic in two adjacent transmitters 2 without increasing the size. That is, the array antenna device 1 can suppress the second harmonic without increasing its size.

[0022] In the above description, the polarization is horizontal and vertical, but the same effect as that described above can be obtained by combining circularly polarized waves and linearly polarized waves.

[0023] Regarding the connection between each of the multiple transmitters 2 and the corresponding polarization switch 3, in the transmitters 2 arranged in the even-numbered columns among the multiple transmitters 2, the first output terminal 26 may be connected to the horizontal terminal H of the corresponding polarization switch 3, and the second output terminal 28 may be connected to the vertical terminal V of the corresponding polarization switch 3. In that case, in the transmitters 2 arranged in the odd-numbered columns among the multiple transmitters 2, the first output terminal 26 is connected to the vertical terminal V of the corresponding polarization switch 3, and the second output terminal 28 is connected to the horizontal terminal H of the corresponding polarization switch 3.

[0024] Each of the multiple transmitters 2 may be replaced by a transmitter 2A shown in Fig. 3. Fig. 3 is a diagram showing a configuration of a transmitter 2A according to a modified example of the embodiment. The transmitter 2A is a transmitter in which the first amplifier 23 and the second amplifier 24 of the transmitter 2 are replaced by an amplifier 29. That is, the transmitter 2A has an input terminal 21, a phase shifter 22, an amplifier 29, a switch 25, a first output terminal 26, a transmission line 27, and a second output terminal 28. In the transmitter 2A, the input terminal 21, the phase shifter 22, the amplifier 29, and the switch 25 are connected in this order.

[0025] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies. Parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0026] 1 array antenna device, 2, 2A transmitter, 3 polarization switch, 4 antenna, 21 input terminal, 22 phase shifter, 23 first amplifier, 24 second amplifier, 25 switch, 26 first output terminal, 27 transmission line, 28 second output terminal, 29 amplifier, H horizontal terminal, V vertical terminal.

Claims

[Claim 1] A plurality of transmitters arranged in parallel; A plurality of polarization switches; A plurality of antennas, Each of the plurality of transmitters is connected to a corresponding one of the plurality of polarization switchers, Each of the plurality of polarization switches is connected to a corresponding one of the plurality of antennas, each of the plurality of transmitters has an input terminal, a phase shifter, an amplifier, a switch, a first output terminal connected to a first end of the switch, a transmission line connected to a second end of the switch, and a second output terminal connected to the transmission line; the input terminal, the phase shifter, the amplifier, and the switch are connected in the order of the input terminal, the phase shifter, the amplifier, and the switch; The electrical length of the transmission line is adjusted to ¼ of the wavelength of the fundamental wave, Regarding a connection between each of the plurality of transmitters and a corresponding polarization switch, In a transmitter arranged in an odd-numbered row among the plurality of transmitters, the first output terminal is connected to a horizontal terminal of a corresponding polarization switch and the second output terminal is connected to a vertical terminal of the corresponding polarization switch, and in a transmitter arranged in an even-numbered row among the plurality of transmitters, the first output terminal is connected to a vertical terminal of the corresponding polarization switch and the second output terminal is connected to a horizontal terminal of the corresponding polarization switch, or In a transmitter arranged in an even-numbered row among the plurality of transmitters, the first output terminal is connected to a horizontal terminal of a corresponding polarization switch and the second output terminal is connected to a vertical terminal of the corresponding polarization switch, and in a transmitter arranged in an odd-numbered row among the plurality of transmitters, the first output terminal is connected to a vertical terminal of the corresponding polarization switch and the second output terminal is connected to a horizontal terminal of the corresponding polarization switch, The double wave output from the odd-numbered row transmitter and the double wave output from the even-numbered row transmitter cancel each other out and are suppressed. Array antenna device comprising:

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