JPH02112305A - Two-frequency receiving antenna - Google Patents

Abstract

PURPOSE:To reduce the labor of setting work, setting space, etc., by positioning the receiving part for high frequencies at the center part of a convergent position, and providing the receiving part for low frequencies so as to surround the receiving part for the high frequencies. CONSTITUTION:A receiving part 11 for the high frequencies is provided at the center part of the convergent position, and a receiving part 12 for the lower frequency part than the high frequency part is provided around the part 11. Consequently, when the high frequency radio wave is received, the radio wave is reflected by a reflecting mirror 4, it can be received by the receiving part 11 for the high frequencies, on the contrary, when the low frequency radio wave is received, the radio wave is reflected by the reflecting mirror 4, and received by the receiving part 12 for the low frequencies. Thus, since the both receiving part 11 for the high frequencies and receiving part 12 for the low frequencies are arranged at the convergent position of the radio wave by means of a single reflecting mirror 4, a single mirror 4 is sufficient, and at the time of setting, both the labor of setting work and the setting space can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a receiver in which incoming UHF or SHF radio waves are reflected by a reflecting mirror, and the reflected radio waves are received by a receiver at a convergence location. Regarding antennas.

[Conventional technology]

When receiving one incoming radio wave, one receiving antenna as described above is prepared. In addition to the above radio waves, if you wish to receive other radio waves with different frequencies,
Another receiving antenna with a similar structure but different only in reception frequency is prepared.

[Problem to be solved by the invention]

With this conventional means, when receiving two frequencies as described above, two large reflecting mirrors are required, and when installing them, for example, the problem is that each requires labor and installation space. was there.

The present invention has been made in view of the above points, and its purpose is to be able to receive radio waves of two different frequencies, and to receive them using a single reflecting mirror. It is an object of the present invention to provide a dual-frequency receiving antenna which can reduce the labor and installation space required for installation by half compared to the conventional technology.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

The incoming high-frequency radio waves are reflected by the reflecting mirror and received by the high-frequency receiver. On the other hand, the arriving low frequency radio waves are reflected by the reflecting mirror and received by the low frequency receiving section.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

In FIG. 1, reference numeral 1 denotes a two-frequency receiving antenna, which is supported by a support device 2 equipped with a direction angle and elevation angle adjusting device. 3 is a well-known radome.

In the antenna 1, reference numeral 4 is a reflecting mirror that reflects and focuses incoming radio waves. Reference numeral 5 denotes a primary radiator, which is supported by a support rod 6 at a location where radio waves reflected by the reflecting mirror 4 are focused. 7 is a converter for satellite broadcasting, and 8 and 9 are transmission lines.

Next, FIGS. 2 to 4, which show the above-mentioned -order radiator 5 in detail, will be explained. Reference numeral 11 denotes a high-frequency receiver, which is located at the center of the focusing location. Reference numeral 12 denotes a receiving section for low frequencies, and the above-mentioned receiving section 11 for high frequencies
It is designed to receive radio waves of a lower frequency than the radio waves received by the receiver, and is provided so as to surround the periphery of the above-mentioned high frequency receiver 11.

Next, the high frequency receiving section 11 and related members will be explained. The high frequency receiving section 11 is configured using a circular waveguide so as to be able to receive circularly polarized radio waves. The diameter d of the opening end is also called the aperture diameter, and the smaller it is, the larger the beam width (also called directivity) during reception is, and the larger it is, the smaller the beam width is. In this example, the beam width is set to be approximately equal to the aperture angle θ of the reflecting mirror 4. Reference numeral 15 denotes a radio wave selection section connected to the receiving section 11, which includes a retardation plate 17 inside a circular waveguide 16 formed in the circular waveguide of the receiving section and the member. Of the incoming circularly polarized radio waves, only left-handed circularly polarized waves are selected and passed.

18 is a connecting flange to which the converter 7 is connected. Note that 7a is a radio wave reception port in the converter, and a probe 7b is provided there. 7c is an output terminal to which the transmission A8 is connected. Reference numeral 19 denotes a mounting board connected to the flange 18, and has a mounting portion 20 around the periphery, and the mounting portion 20 is attached to the tip of the support rod 6.

Next, the low frequency receiving section and related members will be explained. The low frequency receiving section 12 is composed of a planar antenna element 22 and a reflecting plate (also called a ground sensing element) 23 arranged in parallel behind the antenna element. The antenna element 22 is also called a patch element, and in this embodiment is constructed of a copper foil (other conductive metal foil may be used) adhered to one surface of an insulating substrate 24. For such a device, a normal single-sided printed circuit board is used. The outer diameter of the antenna element 22 is determined depending on the frequency of the low-frequency radio waves to be received, and in this example, the above-mentioned radio waves are 1.
In order to receive radio waves of 69G)Iz, the above diameter is set to 75. Reference numeral 25 denotes a feed point provided on the antenna element 22, and in this example, a through hole is formed so that the center conductor 26a of the transmission line 26 can be connected. The location of the improved distribution point 25 is set at a location that matches the impedance of the transmission line. 27 is a through hole for passing high frequency radio waves,
29.30 is a member for setting the beam width of the receiving section for the low frequency, and 29 is an interval setting frame. ,
This is for setting the distance between the antenna element 22 and the reflecting plate 23, and is made of an insulating material. As the distance between the reflector 23 and the antenna element 22, which is set by the frame 29, increases, the beam width of the low-frequency receiver tends to become narrower (smaller). Reference numeral 30 denotes a beam width setting frame disposed around the antenna element 22, and is made of synthetic resin, such as polyethylene resin. In this embodiment, by appropriately selecting the distance between the antenna element 22 and the reflecting plate 23 and the dimensions of the frame 30, the beam width can be changed by changing the dimensions of each part of the frame 30. The beam width of the receiving section is made to substantially match the aperture angle θ of the reflecting mirror 4. The distance between the antenna element 22 and the reflector 23 is 101 mm, and the inner diameter of the frame 30 is 85 mm and the width W.
is 12 dragons, and the height H is 10 cranes. Reference numeral 31 denotes a connecting body that connects frames 29 and 30 together, and this connecting body forms a frame 28 in which frames 29 and 30 are integrally connected. The purpose of this connection is to reduce the labor involved in manufacturing the frames 29 and 30, and also to reduce the labor involved in assembling them with other members. Since the connecting body 31 is located between the antenna element 22 and the reflecting plate 23, by changing its thickness, it is possible to change the impedance of the feed point 25 in the low frequency receiving section 12. be. Next, 32 is a cover to prevent dust from entering into the high-frequency and low-frequency receivers, and is made of a material with low radio wave transmission loss, such as polytetrafluoroethylene resin. The diameter is 110 mm and the thickness is about 0.1 mm (~0°2 thickness). Noryl or ABS resin may be used as the above-mentioned material. A stopper 33 is used to integrate the cover 32, the frame 28, and the reflecting plate 23, and is made of an insulating material such as polycarbonate resin. Note that 34 is a connector attached to the transmission line 26, and 35 is a low-frequency receiver 1 to which the transmission line 9 is connected.
2 is a fastening tool for fixing the device around the high-frequency receiving section 11, and is composed of a frame body 36 made of a conductive material and screw rods 37 and 38 for the fastening material.

Next, the assembly of the above-mentioned -order radiator 5 will be explained. First, in the receiving section 12 for low frequency, the frame body 28 and the reflecting plate 2 are
3. Overlap the frames 36 and connect them together with a stopper 37. Further, the insulating substrate 24 of the antenna element 22 is fixed to the tip of the interval setting frame 29 with adhesive. and transmission line 26
are inserted into the through holes 36a, 23a, and 31a provided in the frame 36, the reflecting plate 23, and the connecting body 31, respectively, and the center conductor 2
6a to the feed point 25, and the outer conductor 26
b is soldered to the edge of the hole in the frame 36, the cover 32 is placed on the end, and the cover 32, the frame 28, and the reflecting plate 23 are integrally connected with the stopper 33. The thus completed low frequency receiving section 12 is fitted around the high frequency receiving section 11 and fixed with a stopper 38. This completes the -order radiator 5. A converter 7 is connected to this primary radiator 5, and a mounting board 19 is attached to it, and the mounting board 19 is used to attach it to the tip of a support rod 6, and as shown in FIG. installed in position.

Next, the operation of the antenna 1 will be explained.

When receiving high-frequency radio waves, for example, circularly polarized radio waves of 11.7 to 12 GHz (SHF) from a broadcasting satellite (for example, Yuri), adjust the antenna l to a predetermined position from which the radio waves arrive using an adjustment device. point in the direction of

In this state, the right-handed circularly polarized radio waves arriving from the broadcasting satellite are reflected by the reflecting mirror 4 to become left-handed circularly polarized waves, which are focused toward the -order radiator 5. The above radio waves pass through the cover 32 in the primary radiator 5, and then pass through the high frequency receiver 1.
1 is received. The received radio waves pass through the selection section 15 and reach the radio wave reception lower a of the converter 7. The radio waves are received by the probe 7b, and then subjected to well-known frequency conversion to become an intermediate frequency of, for example, 1.035 to 1.335 GHz, and sent to the transmission line 8 from the output terminal 7c.

On the other hand, low-frequency radio waves, such as 1691 MHz arriving from other satellites (for example, meteorological satellites such as Himawari)
When it is desired to receive radio waves of (U HF ), the antenna 1 is directed to a predetermined direction in which it can receive the above-mentioned incoming radio waves using the adjustment device as in the case described above.

If the meteorological satellite is located close to the broadcasting satellite and can receive the incoming radio waves well, the direction of the antenna 1 may be left as it was. The radio waves arriving from the satellite are reflected by the reflection ta4 in the same manner as in the above case, and are focused toward the -order radiator 5.

The radio waves are received by the low frequency receiving section 12.

The received signal is sent from the feed point 25 to the transmission line 9 via the transmission line 26.

In the case of the above reception, the receiving section 11 for high frequency and low frequency
．． Both 12 and 12 are circularly polarized antennas, so even when antenna 1 is installed on a moving body such as a ship or vehicle and moves (even when the antenna rotates around the straight line connecting the satellite and the antenna) ), both of the above radio waves can be received well.

Next, FIG. 5(A) shows the radiation pattern of the receiving section 12 for low frequencies, where the solid line shows the radiation pattern shown in FIGS. 2 to 4, and the broken line shows the radiation pattern with the frame 30 removed. It shows. Further, FIG. 5(B) shows the radiation pattern of the receiving section 11 for high frequencies. In both cases, good directivity characteristics are shown despite the presence of other receiving sections 11 and 12.

Next, FIGS. 6 to 8 show different embodiments of the present application, and show different examples of the configuration of the high frequency receiving section lie. This high frequency receiving section 111 is connected to the insulating substrate 2.
It is composed of a planar antenna element 41 provided on the front surface of 4a and a reflecting plate (ground conductor plate) 42 provided on the back surface. Both the antenna element 41 and the reflecting plate 42 are constructed of metal body foil adhered to the insulating substrate 24e. 43 is a feed point in the antenna element 41, where transmission! The center conductor 8a at 118e is connected by soldering. The outer conductor 8b of the transmission line 8e is connected to a ground conductor plate 42 by soldering.

In addition, 44 is a spacer, and 45 is a fastener for fastening the receiving parts 11e and 12e to the mounting board 19e.

It should be noted that parts that are considered to have the same or equivalent structure as those in the previous figure in terms of function are given the same reference numerals as in the previous figure with the letter e, and redundant explanations are omitted.

〔Effect of the invention〕

As described above, in the present invention, when receiving high frequency radio waves, the radio waves can be reflected by the reflection 114 and received by the high frequency receiving section 11, while low frequency radio waves can be received by the high frequency receiving section 11. When receiving radio waves, the radio waves are reflected by the above-mentioned reflecting mirror 4 and can be received by the low-frequency receiver 12.

Moreover, even in a device that can receive high and low frequencies as described above, both the high frequency receiving section 11 and the low frequency receiving section 12 are placed at the location where the radio waves are focused by one reflecting mirror 4. , there is a structural feature that only one bulky reflecting mirror 4 is required. This has the effect that when installing a bulky reflecting mirror, both the installation work and the installation space can be halved compared to the above-mentioned conventional technology.

Moreover, even if one receiving section 11, 12 for two high and low frequencies is provided at the location where the radio waves are focused by one reflecting mirror 4 as described above, the B type of these receptions is for high frequency waves with relatively sharp directivity. Since the signal is received at the center of the focal point and the low frequency waves with relatively loose directivity are received around it, it has the advantage that both high and low frequency waves can be received with high efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and Fig. 1 is a side view showing the installed state of the antenna, Fig. 2 is a vertical cross-sectional view of the primary radiator, Fig. 3 is a perspective view of the primary radiator, and Fig. 4. 5 is an exploded perspective view of the primary radiator, FIG. 5 is a radiation pattern diagram, FIG. 6 is a vertical cross-sectional view showing different examples of the primary radiator, FIG. 7 is a perspective view of the receiver section viewed from the front side, and FIG. The figure is a perspective view of the receiving section seen from the rear side. 4.Reflector, 11... Receiving section for high frequency, 12...
Receiving section for low frequencies. Figure 3 Figure 5 Figure 5 Figure 8

Claims (1)

[Claims] In a receiving antenna comprising a reflecting mirror for reflecting and focusing incoming radio waves, and a receiving section disposed at a place where the radio waves reflected by the reflecting mirror are focused, the arrangement state of the receiving section is a focusing state. A two-frequency receiving antenna in which a receiving section for high frequency waves is disposed in the center of a place, and a receiving section for low frequency waves lower than the above-mentioned high frequency band is disposed around the receiving section.