JP2924376B2 - Antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applied to an antenna device for satellite communication. In particular, the present invention relates to an antenna device whose beam direction is electrically variable.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional antenna device. FIG. 5 is a diagram showing the operation principle of changing the beam direction of the antenna device.

Conventionally, in an antenna device, as shown in FIG. 4, two horn antennas 11 and 12 are connected to variable phase shifters 13 and 14 for changing the beam direction, respectively. The terminal 15 was connected. Here, in order to electrically change the beam direction from the horn antennas 11 and 12, the variable phase shifters 13 and 1 are used.
4 is changed.

In FIG. 5, horn antennas 11 and 12 are provided.
If the two horn antennas are excited in the same phase, the beam direction of the composite pattern is upward, that is, in the y direction. Now, in order to change the beam direction of the composite pattern by the angle θ _T [rad], the excitation phase on the horn antenna 11 side is set to (2πd / λ) sin θ _T [ra
d], and the excitation phase on the horn antenna 12 side should be advanced by (2πd / λ) sin θ _T [rad]. Conversely, in order to change the beam in the direction of the angle −θ _T [rad], the excitation phase on the horn antenna 11 side is changed to (2
πd / λ) sin θ _T [rad], and the excitation phase on the horn antenna 12 side is set to (2πd / λ) sin θ _T [r
ad].

[0005]

However, such a conventional antenna device has the following drawbacks because the phase shifter is directly connected to the feed line of each antenna. It is not possible to change only the beam direction of the combined pattern at the time of reception. There is a phase shifter loss due to the need for a phase shifter. When the transmission power is high, it is necessary to increase the withstand power of the phase shifter.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks. An antenna which does not require a phase shifter, has no loss due to the phase shifter, and can change the beam direction of the combined pattern at the time of reception without changing at the time of transmission. It is intended to provide a device.

[0007]

According to the present invention, there is provided an antenna apparatus comprising: a plurality of antennas; and a distributing / combining means connected to the plurality of antennas for distributing and combining transmission / reception signals and connecting to input / output terminals. A plurality of power distribution means inserted between the plurality of antennas and the distribution combiner for branching and outputting received signals of the plurality of antennas, respectively; and a branch output of the plurality of power distribution means based on an input bias voltage. It is characterized by comprising a plurality of high-frequency amplifiers whose phases are variable, a synthesizing means for synthesizing outputs of the plurality of high-frequency amplifiers, and a plurality of bias terminals for respectively applying the bias voltage to the high-frequency amplifier.

According to the present invention, the high-frequency amplifier includes a first coil having one terminal connected to a branch output of the power distribution means, and a first coil having one terminal connected to a common potential. And the first capacitor inserted between the other terminal of the first coil and the bias terminal, the first resistor, the other terminal of the first coil and the common potential A third capacitor inserted between the bias terminal and the common potential, a base connected to the other terminal of the first coil, and an emitter connected to the common terminal. A transistor connected to a potential, a second coil inserted between a power supply terminal and the collector of the transistor, a fourth capacitor inserted between the power supply terminal and the common potential, No May include Kuta and a third coil which is inserted between said combining means, and a fifth capacitor which is inserted between said combining means and said common potential.

Further, according to the present invention, the power distribution means may be a directional coupler.

[0010]

The power distribution means inserted between the plurality of antennas and the distribution combiner branches and outputs the reception signals of the antennas. The high-frequency amplifier varies the phase of the branch output of the power distribution means based on the input bias voltage. The combining means combines the outputs of the high-frequency amplifier. The bias terminal supplies a bias voltage input from the outside to the high frequency amplifier.

As described above, the phase shifter is not required, there is no loss due to the phase shifter, and the beam direction of the combined pattern can be changed during reception without changing during transmission.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an antenna device according to an embodiment of the present invention. FIG. 2 is a circuit diagram of an amplifier of the antenna device of the present invention.

In FIG. 1 and FIG. 2, the antenna device has horn antennas 1 and 2 as a plurality of antennas and an input / output terminal 5 as distribution combining means connected to the horn antennas 1 and 2 for distributing and combining transmission and reception signals. Prepare.

A feature of the present invention is that directional coupling is used as power distribution means inserted between the horn antennas 1 and 2 and the input / output terminal 5 to branch and output the reception signals of the horn antennas 1 and 2 respectively. Amplifiers 3, 4, amplifiers 6, 7 as high-frequency amplifiers for varying the phase of the branch output of directional couplers 3, 4 based on the input bias voltage, and reception signal output terminal 8 combining the outputs of amplifiers 6, 7 And the amplifiers 6 and 7 are provided with bias terminals 9 and 10 for applying the bias voltage, respectively.

The amplifiers 6 and 7 are provided with directional couplers 3 and
Input terminal 26 connected to the branch output of input terminal 4 and input terminal 2
6, a coil 21 serving as a first coil having one terminal connected thereto, a capacitor 16 serving as a first capacitor inserted between one terminal of the coil 21 and a common potential, and the other terminal of the coil 21. A resistor 24 as a first resistor inserted between the bias terminals 9 and 10; a capacitor 17 as a second capacitor inserted between the other terminal of the coil 21 and the common potential; A capacitor 19 as a third capacitor inserted between the capacitor 10 and the common potential, and a transistor 2 having a base connected to the other terminal of the coil 21 and an emitter connected to the common potential.
5, a coil 22 as a second coil inserted between the power supply terminal 28 and the collector of the transistor 25; a capacitor 20 as a fourth capacitor inserted between the power supply terminal 28 and the common potential; 25 includes a coil 23 as a third coil inserted between the collector 25 and the reception signal output terminal 8 and a capacitor 18 as a fifth capacitor inserted between the reception signal output terminal 8 and the common potential. .

The operation of the antenna device having such a configuration will be described. FIG. 3 is a diagram showing amplitude frequency characteristics and phase frequency characteristics of the transistors of the amplifier of the antenna device of the present invention.

In FIG. 1, when transmitting, inputting the transmission power to the input / output terminal 5 causes the horn antennas 1 and 2 to transmit. However, in this case, a part of the transmission power is lost in the dummy of the directional couplers 3 and 4.

At the time of reception, the horn antennas 1, 2
Are passed through the directional couplers 3 and 4 and combined in the same phase to reach the input / output terminal 5. At this time, part of the received signal is transmitted from the coupling ports of the directional couplers 3 and 4 to the amplifier 6
7 is input. When the amplifiers 6 and 7 have the same frequency characteristics, the amplifiers amplify the received signals, combine them in the same phase, and output to the received signal output terminal 8.

That is, if a bias voltage is applied to the bias terminals 9 and 10 so that the amplifiers 6 and 7 have the same amplitude and phase frequency characteristics, the center of the beam in the front direction of the horn antennas 1 and 2 can be obtained. A received signal can be obtained. To change the pattern only during reception, the phase characteristics of the amplifiers 6 and 7 may be changed. This will be described with reference to FIG. 3. In order to move the beam by the angle + θ _T , the phase of the amplifier 6 is compared with that of the amplifier 7 by (4πd /
λ) sin θ _T [rad], or the phase of the amplifier 7 is compared with that of the amplifier 6 by (4πd / λ) si
It is sufficient to advance by nθ _T [rad].

The phase characteristics of the amplifiers 6 and 7 are changed by the bias voltage applied from the bias terminals 9 and 10.

In FIG. 2, the amplifiers 6 and 7 receive a received signal from an input terminal 26, amplify the signal from an output terminal 27, and output the amplified signal. Apply an appropriate DC voltage to the power supply terminal 28,
By adjusting the bias voltage applied to the bias terminal 29, the collector current I _C can be changed.
The collector current I _C is changed, but the amplitude and phase characteristics of the amplifiers 6 and 7 varies, unchanged amplitude little,
An operation region in which only the phase characteristic changes may be used.

[0022] FIGS. 3 (a) and 3 (b) shows an example of the gain and phase of the frequency characteristics with respect to the collector current I _C of the transistor 25, respectively. As shown in FIG. 3 (a), 10mA~20mA the collector current I _C is 1GHz
Although little change amplitude gain (dB) is also changed to the phase (degrees) shown in FIG. 3 (b) is about 6 ° change. Therefore, if the collector current I _C is changed, the phases of the amplifiers 6 and 7 can be changed, and the beam direction of the antenna at the time of reception can be changed.

[0023]

As described above, the present invention does not require a phase shifter, has no loss due to the phase shifter, and can change the beam direction of the combined pattern at the time of reception without changing the beam direction at the time of transmission. Has an effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of an antenna device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of an amplifier of the antenna device according to the present invention.

FIG. 3 is a diagram showing amplitude frequency characteristics and phase frequency characteristics of a transistor of an amplifier of the antenna device of the present invention.

FIG. 4 is a block diagram of a conventional antenna device.

FIG. 5 is a diagram illustrating an operation principle of changing a beam direction of the antenna device.

[Explanation of symbols]

 1, 2, 11, 12 Horn antenna 3, 4-way coupler 5, 15 I / O terminal 6, 7 Amplifier 8 Received signal output terminal 9, 10, 29 Bias terminal 13, 14 Variable phase shifter 16-20 Capacitor 21 23 Coil 24 Resistance 25 Transistor 26 Input terminal 27 Output terminal 28 Power supply terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01Q 3/00-3/46 H01Q 21/00-21/30 H01Q 23/00 H01Q 25/00-25 / 04

Claims (3)

(57) [Claims] A plurality of antennas, and a transmission / reception signal connected to each of the plurality of antennas is distributed and combined , and input / output terminals are provided.
An antenna device comprising: a divider / combiner connected to a plurality of antennas; power dividers inserted between the plurality of antennas and the divider / combiner to branch and output received signals of the antennas; A high-frequency amplifier that is inserted into the branch output of the power distribution means to vary the phase thereof, a combining means for combining the outputs of the high-frequency amplifier for the plurality of antennas, and a bias terminal for applying the bias voltage to the high-frequency amplifier, respectively. An antenna device comprising: 2. A high-frequency amplifier, comprising: a first coil having one terminal connected to a branch output of the power distribution means;
A first capacitor inserted between one terminal of the first coil and a common potential, and a first resistor inserted between the other terminal of the first coil and the bias terminal. A second capacitor inserted between the other terminal of the first coil and the common potential; a third capacitor inserted between the bias terminal and the common potential; A transistor connected to the other terminal of the first coil and having an emitter connected to the common potential;
A second coil inserted between a power supply terminal and a collector of the transistor, a fourth capacitor inserted between the power supply terminal and the common potential, and a collector of the transistor and the combining means. 2. The antenna device according to claim 1, further comprising a third coil inserted between the third coil and the fifth capacitor inserted between the combining unit and the common potential. 3. The antenna device according to claim 1, wherein said power distribution means is a directional coupler.