JPH03169102A - Circularly polarized wave receiver - Google Patents

Abstract

PURPOSE:To simplify the constitution of a feeding circuit by adopting a microstrip line antenna folded in a crank form. CONSTITUTION:Since each circularly polarized wave array antenna 11 adopts a microstrip line antenna and two feeders 12, 13 outputting right rotatory and left rotatory circularly polarized wave signals respectively are set to a remote position facing to each circularly polarized wave array antenna 11. Thus, the constitution of the feeders 12, 13 is simplified. Since the feeders 12, 13 are formed on a same plane and the antenna receiving the right rotatory and left rotatory circularly polarized wave signals simultaneously are formed on the same plane, the constitution of the antenna is simplified. Moreover, the right rotatory and left rotatory circularly polarized wave signals are separated efficiently independently of the characteristic of the separation of the planer array antenna itself with respect to the right rotatory and left rotatory circularly polarized wave signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a microwave receiving device using a planar array antenna. This invention relates to a circularly polarized wave receiving device that can simultaneously receive circularly polarized waves and has excellent separation of right-handed and left-handed circularly polarized waves. BACKGROUND OF THE INVENTION For example, in satellite broadcasting, in order to prevent interference, channels are assigned to each country based on frequency as well as right-handed circularly polarized waves or left-handed circularly polarized waves. Right-handed circularly polarized waves and left-handed circularly polarized waves are always assigned to adjacent channels.

In order to receive both right-handed and left-handed circularly polarized waves simultaneously and separately, it is necessary to have a good degree of separation between right-handed and left-handed circularly polarized waves, and to receive right-handed and left-handed circularly polarized waves simultaneously and separately. An antenna that receives circularly polarized waves and an antenna that receives left-handed circularly polarized waves are simultaneously required. One way to receive both left and right circularly polarized waves simultaneously and separately with one antenna is to combine a hybrid circuit with a primary radiator made of a circular waveguide in a parabolic antenna. On the other hand, a thousand-sided array antenna with a large number of antenna radiating elements arranged in an array can receive both right-handed and left-handed circularly polarized waves simultaneously and separately with one antenna. In order to achieve this, it is necessary to make it possible to separate and radiate both left and right circularly polarized waves in the large number of antenna radiating elements that make up the thousand-sided array antenna.

For example, in a microstrip array antenna, which is a type of 1000-sided array antenna, there is a method in which a feeding circuit composed of a hybrid circuit is coupled to an antenna radiating element.

FIG. 4 shows a conventional left and right circularly polarized receiving antenna using a microstrip array antenna, which is a type of planar array antenna. FIG. 4(a) shows a microstrisop punch type circularly polarized wave radiating element that can radiate both left and right circularly polarized waves with a single antenna radiating element. 1 is a square microstrinobubanoch, 2 is a hybrid circuit that is a power supply circuit, if power is supplied from terminal 3, right-handed circularly polarized waves will be emitted from batch 1, and if power is supplied from terminal 4, left-handed circularly polarized waves will be punched. It is radiated from 1. Figure 4 Q)l is a microstrip array antenna in which a large number of microstrip punches 1 shown in Figure 4(a) are arranged, and 5.6 is a feeding point for right-handed circularly polarized waves and a feeding point for left-handed circularly polarized waves, respectively. This is the power supply point. To create a right-handed circularly polarized antenna by combining multiple terminals 3 of multiple feeder circuits 2 connected to multiple microstrinob patches 1, multiple terminals 3 are combined into one right-handed circularly polarized antenna. A power feed line is provided at a feed point 5 for combining a large number of terminals 4 of a large number of feed circuits 2 connected to a large number of microstrip batches 1 to form a left-handed circularly polarized antenna. , a feed line is provided that connects a large number of terminals 4 to one feed point 6 for left-handed circularly polarized waves.

Problems to be Solved by the Invention However, in the above structure, a large number of terminals 3 and a large number of terminals 4 are also placed on the same plane, so when the number of antenna elements increases, it becomes difficult to combine a large number of terminals 3. Since it is unavoidable that the feed line that combines the terminals 4 and the feed line that combines the many terminals 4 intersect with each other, the structure of the feed tm path becomes very complicated, and it is possible to simultaneously receive both left and right circularly polarized waves using a single planar array antenna. The problem was that it was extremely difficult to enable reception. Furthermore, the degree of separation between right-handed circularly polarized waves and left-handed circularly polarized waves is approximately equal to that of hybrid circuit 2, which is the power supply circuit.
Therefore, there was a problem in that the degree of separation between right-handed circularly polarized waves and left-handed circularly polarized waves was determined by the frequency characteristics of the hybrid node circuit.

The present invention has been made in view of the above points, and has a simple structure in which the feed line for right-handed circularly polarized waves and the feed line for left-handed circularly polarized waves do not intersect. An object of the present invention is to provide a circularly polarized wave receiving device that can simultaneously receive wave signals with one antenna and separate left and right circularly polarized signals.

Means for Solving the Problems The present invention uses a microstrip line type antenna that utilizes radiation from a microstrinop transmission line as a planar array antenna used in a circularly polarized wave receiving device. One feeding point of the strip line is used as the feeding point of the right-handed circularly polarized antenna, and the other feeding point of the microstrip line is used as the feeding point of the left-handed circularly polarized antenna. The left-handed circularly polarized signal that leaks out is in reverse phase with a part of the left-handed circularly polarized signal that is combined at the feeding point of the left-handed circularly polarized antenna, and cancels out, and the right-handed circularly polarized signal that leaks into the feeding point of the left-handed circularly polarized antenna The polarized signal is a part of the right-handed circularly polarized signal that is synthesized at the feeding point of the right-handed circularly polarized antenna, and is canceled out in reverse phase.

Effect of the Invention With the above-described structure, the present invention can simultaneously receive both left and right circularly polarized waves with a single antenna without the feed line for right-handed circularly polarized waves and the feed line for left-handed circularly polarized waves intersecting on the same plane. The feed line for right-handed circularly polarized waves and the feed line for left-handed circularly polarized waves can be arranged on the same plane together with the thousand-sided array antenna.

Furthermore, the left and right circularly polarized signals can be efficiently separated regardless of the characteristics of the planar array antenna itself regarding the degree of separation between the left and right circularly polarized waves. Embodiment FIG. 1 shows a first embodiment of a circularly polarized wave receiving apparatus according to the present invention. In FIG. 1, the thousand-sided array antenna IO consists of a one-dimensional multi-element circularly polarized array antenna 11 constructed of microstrip lines bent into a crank shape, and feed lines 12 and 13 of each circularly polarized array antenna 11. The feed lines 12 and 13 feed in-phase power to each circularly polarized array antenna 11. 14.15 is a frequency converter, ■6 is a local oscillator, 17.18 is a phase shifter, 19.20
is a variable attenuator, 2l is a power combiner, and 22 is an output terminal.

Right-handed circularly polarized waves and left-handed circularly polarized waves are generated by one-dimensional multi-element circularly polarized array antenna 1. 1, the right-handed circularly polarized wave signal received by the planar array antenna 10 and the left-handed circularly polarized wave signal received by the thousand-sided array antenna 10 are output from separate frequency converters. Entered on 14.15. The local oscillator 16 is a local oscillator for the frequency converter l4 as well as a local oscillator for the frequency converter l5. The right-handed circularly polarized signal converted into an intermediate frequency signal by the frequency converter 14 has its phase and amplitude adjusted by a phase shifter 17 and a variable attenuator 19, is combined by a power combiner 21, and is output from an output terminal 22. Ru. On the other hand, the left-handed circularly polarized wave signal converted into an intermediate frequency signal by the frequency converter l5 has its phase and amplitude adjusted by the phase shifter 18 and the variable attenuator 20, is combined by the power combiner 21, and is output from the output terminal 22. Output.

When receiving a right-handed circularly polarized wave, the phase of the left-handed circularly polarized wave signal with a high signal level combined in the feed line 13 is adjusted by a phase shifter l8, and the amplitude is adjusted by a variable attenuator 20. The left-handed circularly polarized wave signal is then synthesized in the power combiner 21 so that it has the same amplitude and opposite phase as the left-handed circularly polarized wave signal with a low signal level leaked to the feed line 12, so that the left-handed circularly polarized wave signal is delivered to the output terminal 22. You can prevent it from appearing. On the other hand, when receiving left-handed circularly polarized waves, the phase of the right-handed circularly polarized waves with a high signal level synthesized on the feed line I2 is adjusted by the phase shifter 17, and the amplitude is adjusted by the variable attenuator 19. The right-handed circularly polarized signal is adjusted so that it has the same amplitude and opposite phase as the low-level right-handed circularly polarized signal leaked to the feed line 13, and is combined in the power combiner 21. It can be prevented from appearing on the output terminal 22.

In the circularly polarized wave receiving device according to the first embodiment, each circularly polarized wave array antenna 11 is a microstrinob line type antenna, and therefore outputs a right-handed circularly polarized wave signal and a left-handed circularly polarized wave signal, respectively. Since the two feed lines 12.13 can be set at separate positions facing each other with respect to each circularly polarized array antenna l1, the structure of the feed circuit 12.13 can be simplified. In addition, since the feeder circuits 12 and 13 can be placed on the same plane, antennas that can simultaneously receive right-handed circularly polarized signals and left-handed circularly polarized signals can be placed on the same plane. itself can be simplified. Furthermore, the left and right circularly polarized signals can be efficiently separated regardless of the characteristics of the thousand-sided array antenna itself regarding the degree of separation between the left and right circularly polarized waves.

FIG. 2 shows a second embodiment of the circularly polarized wave receiving apparatus according to the present invention, and the same parts as in FIG. 1 are given the same numbers and will be described. The planar array antenna 10 is composed of a one-dimensional multi-element circularly polarized array antenna 11 made up of a micro-striumb line bent into a crank shape, and feed lines 12 and 13 of each circularly polarized array antenna 11, and is fed with power. Railroad 1
2.13 is feeding the in-phase power to each circularly polarized array antenna 1l, 23.24 is a phase shifter, 25 is a directional coupler, 26
．． 27 is a frequency converter, 28 is a suinochi, and 29 is an output terminal.

Since the right-handed circularly polarized wave and the left-handed circularly polarized wave are each output from separate terminals of the one-dimensional multi-element circularly polarized array antenna 11,
The right-handed circularly polarized signal received by the planar array antenna 10 and the left-handed circularly polarized signal received by the planar array antenna 10 are input to separate phase shifters 23 and 24, respectively.

The right-handed circularly polarized wave signal and the left-handed circularly polarized wave signal whose phases have been adjusted by the phase shifter 2324 are combined by the directional coupler 25 and input to the frequency converters 26 and 27, respectively. .27 is converted into an intermediate frequency signal, and the switch 28
Either the right-handed circularly polarized signal or the left-handed circularly polarized signal is selected and output from the output terminal 29.

When receiving right-handed circularly polarized waves, the phase of the left-handed circularly polarized waves with a high signal level combined on the feed line 13 is adjusted by a phase shifter 24, and the amplitude is adjusted by a directional coupler 25. Then, pay! By making the left-handed circularly polarized wave signal have the same amplitude and the opposite phase as the left-handed circularly polarized wave signal having a low signal level leaked to the line 12, it is possible to prevent the left-handed circularly polarized wave signal from appearing in the manual power of the frequency converter Fi26. Conversely, when receiving left-handed circularly polarized waves, the phase of the right-handed circularly polarized waves with a high signal level synthesized by the feed line 12 is adjusted by the phase shifter 23, and the amplitude is adjusted by the directional coupler 25. By adjusting the signal so that it has the same amplitude and opposite phase as the low-level right-handed circularly polarized signal leaking to the feed line 13, the right-handed circularly polarized signal is input to the frequency converter 27. You can prevent it from appearing.

In the circularly polarized wave receiving device according to the second embodiment, each circularly polarized wave array antenna 11 is a microstrithop line type antenna, and therefore outputs a right-handed circularly polarized wave signal and a left-handed circularly polarized wave signal, respectively. Two salaries! Since the lines 12 and 13 can be set at separate positions so as to face each other with respect to each circularly polarized array antenna 11, the structure of the feeder circuit can be simplified. Moreover, since the feeder circuits 12 and 13 can be arranged on the same plane, antennas that can simultaneously receive right-handed circularly polarized signals and left-handed circularly polarized signals can be placed on the same plane.
The antenna structure itself can be simplified. Further, by adjusting the degree of coupling of the directional coupler 25, it is possible to efficiently separate left and right circularly polarized signals regardless of the characteristics of the planar array antenna itself regarding the degree of separation of left and right circularly polarized waves.

Figure 3 shows the microstrifle cable bent into a crank shape in the first and second embodiments of the present invention! This figure shows a specific example of the structure of the solar polarization radiation basic element A of the one-dimensional multi-element circularly polarized array antenna 11 shown in FIGS. 1 and 2.

The basic circularly polarized wave radiation element A is composed of two microstrimb lines 30 and 31 bent into a crank shape. The length of each microstrip line 30 and 31 is 2λg (λ8 is the wavelength within the microstrip line). When a signal advances from the left side of the microstrip line 30, 31, a right-handed circularly polarized wave is radiated from the basic circularly polarized wave radiation element A. Conversely, microstrip line 30.31
When a signal advances from the right side of , a left-handed circularly polarized wave is emitted from the circularly polarized wave radiation basic element A. Therefore, it is possible to radiate or receive both left and right circularly polarized waves depending on whether the feeding point is selected on the left or right side of the microstrisobacter line 30, 31.

Effects of the Invention As explained above, according to the present invention, the circularly polarized array antenna is a microstrip line antenna bent into a crank shape. Since the two feeder lines that output the respective outputs can be set at separate positions so as to face each other with respect to the circularly polarized array antenna, the structure of the feeder circuit can be simplified.

Moreover, since the feeder circuit can be configured on the same plane, antennas that can simultaneously receive right-handed and left-handed circularly polarized signals can be placed on the same plane, simplifying the antenna configuration itself. can. Furthermore, the left and right circularly polarized signals can be efficiently separated regardless of the characteristics of the planar array antenna itself regarding the degree of separation between the left and right circularly polarized waves. In particular, when there are left and right circularly polarized signals of close frequencies, it is possible to provide a circularly polarized wave receiver that is resistant to interference.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a circularly polarized wave receiver according to a first embodiment of the present invention, FIG. 2 is a structural diagram of a circularly polarized wave receiver according to a second embodiment of the present invention, and FIG. First and second aspects of the present invention
A specific configuration diagram of the basic circularly polarized wave radiation element A of the one-dimensional multi-element circularly polarized wave array antenna which is used with the micro-strinob line in the example of 2. Composition diagram of Sochi-type circularly polarized wave radiating element, Figure 40
)) is a diagram of a circularly polarized wave receiver in which conventional microstrip patch type circularly polarized wave radiating elements are arranged in an array.

Claims (3)

[Claims] (1) A first feed line, a second feed line, and the first feed line.
a circularly polarized microstrip line antenna provided between the feed line and the second feed line; a first frequency converter connected to the first feed line; and a first frequency converter connected to the first feed line;
a second frequency converter connected to a power supply line; a local oscillator supplying a frequency signal to the first frequency converter and the second frequency converter; and an output signal of the first frequency converter. means for controlling the phase and amplitude of the second
1. A circularly polarized wave receiver comprising: means for controlling the phase and amplitude of the output signal of the frequency converter. (2) a first feed line, a second feed line, and the first feed line;
a circularly polarized microstrip line antenna provided between the feed line and the second feed line; a first phase shifter that controls the phase of the output signal of the first feed line;
a second phase shifter that controls the phase of the output signal of the second feed line; and a synthesis/distribution unit that combines and distributes the output signal of the first phase shifter and the output signal of the second phase shifter. A circularly polarized wave receiving device comprising: a distribution means; and first and second frequency converters that convert the frequency of the signals synthesized and distributed by the synthesis and distribution means. (3) The circularly polarized wave receiver according to claim 1 or 2, wherein the circularly polarized microstrip line antenna is a crank type microstrip line.