JPS63142926A - Weak radio wave passive repeater - Google Patents

Abstract

PURPOSE:To improve the indoor and outdoor weak radio propagating characteristic without using any special amplifier and power supply by providing plural sets of feeding point short-circuit type parasitic antenna elements resonated effectively at a predetermined frequency to the wall face of a house and relaying a radio wave for communication equipment using a weak radio wave. CONSTITUTION:In providing a transmission antenna sending a weak radio wave and a reception antenna 2 receiving a weak radio wave at both sides of a corner of an indoor bent corridor, a conductor rod 5 as a half wavelength dipole element and is imbedded to the inner corner of the bent corridor and a conductor rod 5' is imbedded at an outer wall face 4 open from the transmission antenna 1 and a conductor rod 5'' is imbedded to the outer wall face 4 close to the conductor rod 5' toward the reception antenna 2. The diffraction propagation loss at the propagation path B in a hose along the bent corridor is improved by arranging the conductor rod 5 with excellent conductivity or a conductor plate at the corner. In selecting the electric length of the conductor rod 5 arranged at the corner as a half wavelength, the reradiation is applied effectively and the re-radiation level by the conductor 5' is increased toward the antenna 2 by the similar principle of the Yagi antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a weak radio wave unpowered relay device suitable for use in combination with communication equipment using weak radio waves used in the home.

[Background technology] Communication devices that use weak radio waves are often used in homes, but the transmission output value is regulated to be below a certain value, so
There were cases where it could not be used depending on the frequency used or the antenna installation location. Furthermore, since the signal level is weak, it is easily affected by changes in radio wave propagation conditions inside and outside the home, which poses the problem of lower reliability, especially in the transmission and reception of data signals. In order to avoid this, antenna systems, modulation/demodulation systems, coding systems, etc. have been used to deal with this problem, but such methods have the drawback of requiring a large amount of cost.

Conventionally, when using weak (No. 3) wireless communication,
A distributed transmission/reception system in which multiple antennas and transceivers are wired to intermediate points has been used, but this is also not suitable for home use due to cost. In addition, in the microwave band, as a relay means, a reflector is wired on the ridgeline of a mountain to perform unpowered relay at low cost, but it is not practical for home use because there is a place to mount the reflector. It was scarce.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to improve the effectiveness of communication equipment that uses weak radio waves at home, especially when using communication equipment that uses weak radio waves. It is an object of the present invention to provide a low-cost weak radio wave non-power repeating device that reduces loss caused by (including), improves communication reliability, and is inexpensive.

[Disclosure of the Invention 1 (Structure) The present invention provides a power feeding system that effectively resonates at a predetermined frequency in a weak radio wave parasitic relay device used in combination with communication equipment using weak radio waves used in the home. A plurality of point-shorted parasitic antenna elements are arranged on the wall of a house, and these parasitic antenna elements relay radio waves from communication equipment that uses weak radio waves, making it inexpensive by not using special amplifiers, power supplies, etc. Moreover, by improving the indoor and outdoor weak radio wave propagation characteristics of this parasitic antenna element, loss is reduced and communication reliability is improved.

(Example 1) It is thought that conductive structural materials and electrical wiring materials are mainly obstacles to the propagation of weak radio waves inside and outside a general house.

In other words, because conductors with dimensions and shapes unrelated to the frequency used are wired everywhere, they have effects such as shielding, reflection, and absorption depending on the location. had a great influence on.

Conventionally, such deterioration of radio wave propagation conditions due to structural members of houses, etc. has been dealt with by changing the wiring of transmitting and receiving antennas, but no other measures have been taken, and communication equipment that uses weak radio waves This was an obstacle to its widespread use.

The present invention aims to reduce the propagation loss of weak radio waves by designing or modifying a part of the structure of a house in accordance with the operating frequency.

FIG. 1 shows a first embodiment of the present invention. FIG. 1 shows the present invention applied to a case where a transmitting antenna 1 for transmitting weak radio waves and a receiving antenna 2 for receiving weak radio waves are respectively arranged on both sides of a corner of a curved hallway indoors. . Note that room 3 is located inside the curved hallway. In this example,
A conductor rod 5 as a half-wavelength Guiball element is buried in the inner corner of the above-mentioned curved hallway, and a conductor rod 5'' is buried in the outer wall surface 4 that can be seen from the transmitting antenna 1. A conductor rod 5' is embedded in the wall surface 4.

As shown in FIG. 1, the propagation path through the curved hallway inside the house can be considered to be a direct propagation path shown by arrow A, and a diffraction propagation path shown by the arrow exit that goes around the inside corner of the hallway.

Since route A passes through room 3, there is always a possibility that metal furniture, blinds, etc. will be wired inside the room, making it difficult to stably improve propagation loss.

On the other hand, the diffraction propagation loss at the path entrance can be improved by wiring a conductor rod 5 or a conductor plate with good conductivity at the corner. In this case, depending on the frequency used, there is a possibility of applying a shielding type diffraction plate used in the microwave band, but v
j. Since the shape is rough, the above-mentioned conductor rod 5 is used. If the electrical length of the conductor rod 5 wired at this corner is selected to be half a wavelength, effective re-radiation will occur, and within the line of sight from this conductor rod 5 it will operate as a parasitic relay element. Furthermore, the half-wave conductor rod 5' can be wired freely as long as it can see through the antennas 1 and 2, and the conductor rod 5' can be wired at a distance of about a quarter wave along the wall 4 in the direction of the antenna 2. The length of the conductor rod is selected to be slightly shorter than 5°, and it acts as a wave director. By arranging the conductor rods 5', 5'' in this way, the re-radiation level by the conductor rods 5'' in the direction of the antenna 2 can be increased using the same principle as the Yagi antenna.Conductor rods 5.5
', 5' are both explained as being buried within the wall surface, but means such as attaching a sheet conductor to the surface of the wall material may also be used.In the above explanation, in the case of vertically polarized waves, In the case of horizontally polarized waves, the antenna and the Guiball element may be wired horizontally.

(Example 2) FIG. 2 shows a second example of the present invention. In this embodiment, a conductor loop 7 is used as a parasitic antenna element, and this conductor loop 7 is built into an outer wall panel board 6. Note that the electrical length of the entire circumference of the conductor loop 7 is adjusted to approximately one wave length. This conductor loop 7 is bent into a rectangular frame shape, and the lower ends of the conductor loop 7 are bent inwardly from each other at intervals in the vertical direction to form lower sides 11 and 13. is short, and the lower side 13 of the other end is rounded. Note that the tip of the lower side 13 is separated from the vertical side 12 on one end side, and the shorting conductor 10 is attached so as to cross this lower side 11.13.

By moving this shorting conductor 10 from side to side, it is possible to change the resonant frequency of the conductor loop 7. In order to adjust the resonant frequency by moving this shorting conductor 10, an outer wall panel board is used. 6 is provided with an opening 8. After the shorting conductor 10 has been tightened, it is fixed with a tightening screw 9. The conductor loop 7 as a single-wave loop resonant element has the advantage of being able to respond to both horizontal and vertical polarization even if it remains fixed. If the conductor loop 7 is embedded in the outer wall of the house, the resonant frequency of the conductor loop 7 can be reradiated to form a "radio window" that connects the indoors and outdoors with low loss.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention. In this embodiment, a conductive plate 14 having a slot 15 shown in FIGS. 3(a) and 3(b) is used as a parasitic antenna element.

In this embodiment, a rectangular slot 15 is formed in the conductor plate 14 as shown in FIG. 3(a). The length of the slot 15 in the power direction is usually selected to be half a wavelength.

In addition, the conductor plate 14 may be a welded wire mesh, metal lath, or other material other than a flat plate.
You can also use a wall base material such as Librass. FIG. 3(1) shows an example in which a welding material W416 is used as the conductor plate 14, and a flat plate 17 is attached around the slot 18 to facilitate the flow of current. It is preferable that this flat plate 17 has a dimension that is at least half a wavelength or more from the edge of the slot 18. Note that the flat plate 17 and the welded wire mesh 16 are welded or connected in a way that ensures sufficient electrical contact. Furthermore, when horizontally polarized waves are used, the slots 18 are wired vertically. Further, FIG. 13 shows the inside of the wall, and the wall material is not shown.

(Example 4) FIG. 4 shows an example of FF14 of the present invention,
Similar to FIG. 3, only the parasitic antenna element installed within the wall surface is shown. In this embodiment, a conductor plate 20 with one rectangular annular slot as a parasitic antenna element is used.
It uses The peripheral electrical length of the annular slot 19 shown in FIG. 4(,) is approximately one wavelength. Note that the shape of the annular slot 19 is not limited to a rectangular shape. When forming this annular slot 19, the conductor plate 2 is placed in the center.
1 remains, and in order to support it, it is necessary to line it with a dielectric plate that has sufficiently low loss at the operating frequency. In FIG. 4(b), a laminated printed wiring board is used as the central conductor plate 23, and the annular slot 22 is created by seven etchings. Note that this t54 diagram (b) shows the conductor plate 2.
A welded wire mesh 24 is used as the wire.

(Embodiment 5) FIG. 5 shows a fifth embodiment of the present invention. In the above-mentioned embodiments, the structural materials of the walls were not described, but in reality, the things that impede weak radio transmission include steel frames and columns as structural members, metal joints as exterior materials, There are conductor bars such as metal window frames. Therefore, this embodiment shows an example in which these conductor rods are actively used as parasitic relay elements. In Fig. 5(a), the center piece of a band-shaped U-shaped conductor 27 is attached to a lightweight steel column 26 by welding, and the electrical length of the conductor along the steel column 26 is 1/4 wave. The U-shaped conductor 27 operates as an effective choke or trap in the frequency band used. In other words, the double-shaped conductor 27 is used as a reactance element. Therefore, as shown in FIG. 5(b), the F-shaped conductor 27
If they are wired apart from each other at a distance as shown in the figure, and the electrical length of this distance is set to half a wavelength, a dipole antenna that resonates in the used frequency band can be formed. Moreover, if the interval K is made equal to or less than a quarter wave, it is possible to eliminate the influence on the transmitting and receiving antenna impedance in the used frequency band. In addition, in FIG. 5, a conductor 27 having a F-shaped shape with good conductivity is used, but four conductors are used with the steel column 26 as one conductor.
The choke can also be formed by welding L-shaped plates of 1/2 wave length.

Note that electrical piping or gas pipes other than the steel column 26 can be dealt with in the same manner.

(Embodiment 6) Figure ttS6 shows a sixth embodiment of the present invention. In this embodiment, the electrical dimensions of the metal window frame 29 are shortened or extended.
2 shows a method of forming a wavelength loop element. Figure 6 (
In a), an L-shaped conductor plate 30 with a vertical piece having a length of M is welded to the outer surface of the rectangular frame-shaped window frame 29. Note that the conductor plate 30 is for forming a tip short-circuited distributed constant line (impedance zb). In this case, the same effect as when the sending end impedance zb of the end short circuit line is loaded in series in the middle of the loop electrically formed in the window frame 29'r is obtained, and the electrical length of the loop becomes longer.

Further, the electrical length can be shortened by arranging the conductor plates 31 constituting the open-ended transmission line shown in FIG. 6(a) in parallel. fjS6 Figure (b) shows an example in which the window frame 29 is used as a resonant Gouiball element. The upper and lower sides of the frame 40 are used as resonant gouballs, and the left and right sides are used as non-resonant (does not affect the antenna in the frequency band used). This example is approximately the same as the case in Figure 5 (b).

(Embodiment 7) FIG. 7 shows a seventh embodiment of the present invention. FIG. 7(,) is a diagram showing the structure of a choke for indoor wiring, in which Troy Gluco 742 is connected between RJ daughter plates 45 and 46 arranged in the choke storage case 41, and connected to the terminal plates 45 and 46, respectively. Input/output VVF cables 43° and 44 are connected. The Troigle core 42 is wound with two flat wires using a via T winding, and this error!t2 #i1 is inserted in series with the two wires of the electrical wiring as it is, so the reciprocating current (balanced current)
It has no effect on the current, and acts as a high-impedance choke coil against externally induced common-mode current (unbalanced current).

Figure 7(b) is a diagram showing an example of its use.
In the middle of 48, there is a chalk 47. shown in @7 (a).
When 49 is wired at intervals of half a wavelength in terms of electrical length, it operates as a resonant Goupole. If there is electrical wiring around the transmitting/receiving antenna, inserting these chokes at intervals of 1/4 wavelength or less can eliminate the antenna impedance.This point is similar to the above embodiment. It is.

[Effects of the Invention] As described above, the present invention includes a plurality of feeding point short-circuited parasitic antenna elements that effectively resonate at a predetermined frequency, which are arranged on the wall of a house, and these parasitic antenna elements emit weak radio waves. Because it relays the radio waves of communication equipment that uses a Moreover, it is possible to realize a non-power relay device that is inexpensive and requires no maintenance. In particular, the shielding effect of housing structural materials, exterior materials, wiring materials, etc., which was previously considered unavoidable, is 1!
It is possible to suppress or improve the field disturbance effect, which has the advantage that system design of communication equipment using weak radio waves can be done easily and reliably. This has the effect of preventing large fluctuations in the current state due to the influence of the noise, allowing rational design of gain and directivity, and improving efficiency, which is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the installed state of the first embodiment of the present invention, FIG. 2(a) is a perspective view showing the second embodiment, and FIG.
) is a perspective view of the main parts of the same as above, FIG. 3 (,) is a perspective view showing a parasitic antenna element used in the third embodiment,
) is a perspective view showing another parasitic antenna element, and FIG.
) is a perspective view showing a parasitic antenna element used in the fourth embodiment, FIG. 5(b) is a perspective view showing another parasitic antenna element, and FIG. A perspective view of the main parts, FIG. 6(b) is an overall front view of the same as above, and FIG.
(b) is a front view of a different shape; a perspective view of the main part showing the seventh embodiment of the 74th soil;
)]) is an explanatory diagram showing the overall configuration of the same as above. 1 is a transmitting antenna, 2 is a receiving antenna, 4 is an outer wall surface, 5
．． 5', 5'' are conductor rods. Agent Patent Attorney Stone [H 艮 7 + Book Figure 3 Figure 5 (a) (b) Figure 6 (b)

Claims (7)

[Claims] (1) In a weak radio wave parasitic relay device used in combination with communication equipment using weak radio waves used in the home, a feed point short-circuit type parasitic antenna element that effectively resonates at a predetermined frequency is installed in the house. A weak radio parasitic relay device that is constructed by disposing a plurality of parasitic antenna elements on a wall and relaying radio waves from communication devices that use weak radio waves. (2) The weak radio wave parasitic relay device according to claim 1, characterized in that a half-wavelength dipole antenna is used as the parasitic antenna element. (3) The weak radio wave parasitic relay device according to claim 1, characterized in that a one-wavelength loop antenna is used as the parasitic antenna element. (4) The weak radio parasitic relay device according to claim 1, characterized in that a resonant slot antenna is used as the parasitic antenna element. (5) The weak radio parasitic relay device according to claim 1, characterized in that a reactance element is loaded onto a structural member of a house, and this structural member is used as a parasitic antenna element. (6) A weakly weak antenna according to claim 1, characterized in that a reactance element is loaded in an unbalanced mode on an electrical wiring member inside a wall of a house, and this electrical wiring member is used as a parasitic antenna element. Radio wave unpowered relay device. (7) A trap element is attached to a conductive member in a wall of a house that is not used as a parasitic antenna element so that the conductive member does not resonate at a predetermined frequency. The weak radio wave unpowered relay device according to scope 1.