JPS63151102A - Plane antenna - Google Patents

Abstract

PURPOSE:To easily and inexpensively receive radio waves of two kinds of polarization mode by dividing a reception face and forming a first antenna part, which receives the radio wave of a first polarization mode, on one side and forming a second antenna part, which receives the radio wave of a second polarization mode, on the other. CONSTITUTION:A reception face 1 is divided, and the first antenna part 1a which receives the radio wave of the first polarization mode is formed on one side, and the second antenna part 1b which receives the radio wave of the second polarization mode is formed on the other. For example, horizontally polarized and vertically polarized radio waves are received if the first antenna part 1a is used for the horizontal polarization mode and the second antenna part 1b is used for the vertical polarization mode. In case radio waves of two kinds of polarization mode are received in this manner, it is sufficient if one plane antenna is attached to a wall surface or a roof, and the construction is easy. The cost is reduced by the mass production effect in comparison with production of individual plane antennas of respective polarization modes, and the inexpensive plane antenna is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a planar antenna that receives radio waves transmitted from a satellite.

[Background technology]

Conventionally, this type of planar antenna that receives radio waves transmitted from communication satellites and broadcasting satellites in a geostationary orbit 36,000 KIIl above the equator has been formed to receive radio waves in a single polarization mode, for example, A planar antenna that receives horizontally polarized waves and a planar antenna that receives vertically polarized waves are:
Although the structure was similar, it was a different antenna. Therefore, when receiving a plurality of radio waves with different polarization modes, it is necessary to install planar antennas corresponding to each polarization mode in parallel, which poses a problem in that construction becomes troublesome. In addition, the constituent parts of the planar antenna for each polarization mode (planar antenna body, dustproof cover, mounting parts, etc.) had to be manufactured and assembled separately, which resulted in the problem of not being able to achieve mass production effects and increasing costs. .

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a flat surface that can receive radio waves in two types of polarization modes, is easy to construct, and is inexpensive. The purpose is to provide an antenna.

[Disclosure of the Invention] (Embodiment 1) Figures 1 to 4 show an embodiment of the present invention, in which the receiving surface 1 is divided and a first side is provided on one side for receiving radio waves in the fjSl polarization mode. A second antenna section 1b that forms the antenna section 1a and receives radio waves in a second polarization mode on the other side.
In the specific example shown in FIG. 1, the first antenna section 1a is in the horizontal polarization mode, and the second antenna section 1b is in the vertical polarization mode. In this case, the first antenna section 1a is set to right-handed circularly polarized wave mode, and the second antenna section is set to left-handed circularly polarized wave mode.

3 and 4 show examples of the basic configuration of a planar antenna. In the specific example shown in FIG. 3, there is a ground conductor on the back side.
A general planar antenna is formed by forming an antenna pattern 12 on the surface of a dielectric substrate 11 on which a ground conductor 10 and a feed line are formed. A triplate air suspended type planar antenna is formed by laminating the circuit board 13 and the radiation circuit board 14 on which a radiation circuit pattern is formed with air layers 15n and 15b interposed therebetween.

Now, in the embodiment shown in Fig. 1, it is possible to receive horizontally polarized waves and vertically polarized radio waves, and in the embodiment shown in Fig. 2, it is possible to receive radio waves with right-handed circularly polarized waves and left-handed circularly polarized waves. Even when receiving radio waves in two polarization modes, it is only necessary to attach one planar antenna to the wall or roof, which simplifies construction. Furthermore, compared to the case where planar antennas for each polarization mode are manufactured separately, costs can be reduced due to the mass production effect, and inexpensive planar antennas can be provided.

(Embodiment 2) FIG. 5 shows another embodiment, in which both antenna parts 1a,
lb received signal to low noise converter block LNB
,, Frequency conversion with LNB2 (12GH2→IGHz)
It is designed to select and output one of the received signals via the selector switch SW, and by switching the signal at a low frequency, the loss at the time of switching is reduced and the overall efficiency is increased. This is what I did.

(Embodiment 3) FIG. 6 shows still another embodiment, in which the signal path (waveguide 1
a', 1 b').

The selected received signal is frequency-converted by a low-noise converter block LNB and then output. It is designed so that it can be done with less effort.

(Example 4)! Figure @7 shows yet another embodiment, in which low-noise amplifiers LNAI and LNA2 are provided in the reception signal extraction sections of both antenna sections 1a and 1b, and the amplified reception signal 46 is sent to the combiner MIX. a low-noise amplifier LNA corresponding to antenna units 1 a and 1 b that receives radio waves in unnecessary polarization modes by synthesizing them as antenna output;
, a mode switching means is formed to switch the reception mode by turning off the power of the LNA 2. In the embodiment, the DC power supply DC is input to the power supply circuits DC, , DC2 via the changeover switch SW'', and the power supply circuits DC, , D
C2 forms a bias voltage necessary for the low noise amplifiers LNA, LNA2 and supplies power to them. Further, as the combiner MIX, one having a good separation effect, such as a Wilkinson type, is used.

Now, in this embodiment, a low noise amplifier LNA,
, LNA2 are connected, and the sufficiently amplified received signal is combined by a combiner MIX, which eliminates the loss due to the Fnecta connection,
It is possible to compensate for the coaxial/tracheal canal conversion loss of a combiner using a waveguide bone, and it is now possible to improve the S/N. Also, low noise amplifier LNA, LNA2
Since the received signal is indirectly switched by turning the power on and off, it is possible to reduce the switching loss that occurs when switching high-frequency signals, and
Switching can be performed stably, and an expensive high-frequency signal switch is not required, so the cost is reduced.

(Embodiment 5) Fig. 8 shows still another embodiment, in which the mode switching means formed at the switching contact r of the relay RY is switched depending on the polarity of the DC power supply DC transmitted via the power supply cable CA. In the embodiment, the polarity of the DC power supply DC sent via the power supply cable CA is switched by the polarity changeover switch SW2 provided on the chainer unit installed indoors, and the The relay RY is selectively operated via the low-noise amplifier LNA to select which low-noise amplifier LNA is to be operated. In the figure, DB is a diode bridge, C
, , C2 is a capacitor, and L , , L 2 is an inductance.

Now, in this embodiment, the receiving operation (from the tuner installed indoors to the planar 7 antenna installed outdoors)
In other words, the polarization mode can be easily switched using a simple device.

(Embodiment 6) FIG. 9 shows still another embodiment, in which the polarization mode of @1 antenna section 1a is horizontal polarization, the polarization mode of @2 antenna section 1b is vertical polarization, and both antennas Part 1 a, 1
While making the area of b equal, both antenna parts 11L
The received signals of t16 are combined by a combiner MIX, and the phases of both received signals are shifted by +90 degrees from each other to receive left-handed or right-handed circularly polarized waves. In this case, a phase shifter PS capable of switching the phase shift is inserted into one of the synthesizer inputs, and the phase shift of the phase 'aps is switched depending on the polarity of the DC power transmitted via the power supply cable.

Now, in this embodiment, DC 1! is supplied from the tuner installed indoors. By switching the polarity of the source, the phases of the received signal of the first antenna section 1a that receives horizontally polarized waves and the received signal of the 27th antenna section 1b that receives vertically polarized waves can be changed by +90 degrees or Since it is possible to receive right-handed circularly polarized waves or left-handed circularly polarized waves by synthesizing them with a 190 degree shift, it is possible to easily switch between the two types of circularly polarized waves and receive them, making it versatile. It is possible to provide a flat antenna.

Note that the polarization mode of the tjS17 antenna section 1a is right-handed circular polarization, the polarization mode of the fjLJ2 antenna section 1b is left-handed circular polarization, the areas of both antenna sections 1 at 1 b are made equal, and both antenna sections i The received signals of
It is also possible to receive horizontally or vertically polarized waves by shifting them +90° from each other.

Furthermore, in FIG. 10, a low noise amplifier LNA is installed at the receiving ε signal extraction section of each antenna section ILL, 1b.
, , LNA2 is added to improve the S/N ratio.

FIG. 11 shows a specific example of a low noise amplifier LNA, in which GaAs field effect transistors FET, FE
T2, capacitor Cl0-CI2, inductance L
The input signal Vi is amplified in two stages by field effect transistors FE'r and FET2, and an output signal ε Vo is output. However, Vd, , Vd2 are drain voltages, V[11
, V g2 is the gate bias voltage.

FIG. 12 shows a Wilkinson type combiner MrX, with input terminals rN3. The signals input to INz are synthesized by a synthesis circuit using a microstrip line and a resistor Rm and outputted to an output terminal OUT, so that the separation effect of the input terminals IN, IN2 is good.

Fig. 13 shows a specific example of the low noise block converter LBN, in which the received signal amplified by the low noise amplifier LNA and the signal generated by the local oscillation circuit O8C are mixed by the mixing circuit MIX' to convert the frequency (120 Hz). →
IGHz)L, and is amplified by an intermediate frequency amplifier AMP and output.

[Effects of the Invention 1] As described above, the present invention divides the receiving surface to form the first antenna section for receiving radio waves in the first polarization mode on one side, and the second antenna section for receiving the radio waves in the first polarization mode on the other side. The second antenna part is formed to receive radio waves in two polarization modes, and has the effect of providing a planar antenna that can receive radio waves in two polarization modes, is easy to install, and is inexpensive. .

[Brief explanation of the drawing]

1 and 2 are front views of one embodiment of the present invention,
Figure Js and Figure 4 are sectional views of the main parts of the same as above, and Figure 5 is the same as above.
FIG. 5(a) is a perspective view of another embodiment, FIG. 5(b) is a schematic configuration diagram of the same as above, and FIG. 6 is a perspective view of main parts of another embodiment.
f: Figure A7 is a schematic configuration diagram of yet another embodiment, FIG. 8 is a schematic diagram of still another embodiment, FIG. 9 is a schematic MII diagram of still another embodiment, and FIG. 10 is a schematic MII diagram of yet another embodiment. FIG. 11 is a circuit diagram of the main part of the same as the above, FIG. 12 is a block diagram of the main part of the same as the above, and FIG. 13 is a block circuit diagram of the main part of the same as the above. 1a and 1b are antenna parts. Agent Patent Attorney Ishi 1) Long 71...Receiving surface 1 at 1 b...Antenna section Fig. 1a Fig. 3 Fig. 4 Fig. 5 (a) Fig. 5 (b) Fig. 6 Figure 9 Figure 10 LNA2 MIX Figure 11

Claims (7)

[Claims] (1) The receiving surface is divided to form a first antenna section that receives radio waves in a first polarization mode on one side, and a second antenna section that receives radio waves in a second polarization mode on the other side. A planar antenna characterized by forming a. (2) The planar antenna according to claim 1, further comprising mode switching means for electrically selecting which of the two antenna sections to operate and switching the reception mode. (3) In addition to providing a low-noise amplifier in the reception signal extraction section of both antenna sections, the amplified reception signals are combined in a combiner and used as an antenna output, making it compatible with the antenna section that receives radio waves in unnecessary polarization modes. 3. The planar antenna according to claim 2, further comprising mode switching means configured to switch the reception mode by turning off the power supply of the low noise amplifier. (4) The first polarization mode is horizontal polarization, the second polarization mode is vertical polarization, the areas of both antenna parts are made equal, and the received signals of both antenna parts are combined by a combiner, 2. The planar antenna according to claim 1, wherein the phases of the two received signals are shifted by ±90 degrees when combined to receive left-handed or right-handed circularly polarized waves. (5) The first polarization mode is right-handed circular polarization, the second polarization mode is left-handed circular polarization, the areas of both antenna sections are made equal, and the received signals of both antenna sections are combined in a combiner. death,
2. The planar antenna according to claim 1, wherein the horizontally or vertically polarized waves are received by shifting the phases at the time of synthesis by ±90°. (6) The planar antenna according to claim 3, characterized in that the mode switching means is switched depending on the polarity of the DC power transmitted via the power supply cable. (7) A phase shifter capable of switching the phase shift is inserted into one of the synthesizer inputs, and the phase shift of the phase shifter is switched depending on the polarity of the DC power transmitted via the power supply cable. A planar antenna according to claim 4 or 5.