JPH09275301A - Lightning-proof waveguide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightning-proof waveguide by which destruction of components of a radio communication equipment due to lightning surge delivered from a connection waveguide tying a transmission/reception antenna and the radio communication equipment into the radio communication equipment on the occurrence of lightning. SOLUTION: A sheet plate 3 having insulation property against a lightning surge and having transmittivity for a desired radio wave is inserted between a 1st waveguide 1 and a 2nd waveguide 2 each provided with a flange 12 and a couple of stationary covers are connected and fixed to upper and lower parts of both flanges 12 to couple the 1st and 2nd waveguides 1, 2 so as to have both flanges 12 inbetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of a lightning strike of a wireless communication device, and more particularly to a connecting waveguide connecting an antenna and the wireless communication device.

[0002]

2. Description of the Related Art A conventional lightning strike prevention measure for a wireless communication device is to provide a ground wire from a part of a connecting waveguide section connecting an antenna and the wireless communication device to the ground to escape a lightning surge to the ground. It was being done.

[0003]

According to the conventional measures against lightning strikes, all lightning surges are not grounded, and a part of the lightning surges penetrates into the device from the waveguide up to the wireless communication device and gives damage to the device. There was a problem such as.

An object of the present invention is to provide a lightning protection waveguide capable of preventing destruction of device parts due to a lightning surge transmitted from a connecting waveguide section connecting a transmitting / receiving antenna and a wireless communication device and intruding into the wireless communication device at the time of a lightning strike. Is to provide a tube.

[0005]

According to the present invention, between a first waveguide and a second waveguide each having a flange portion, there is an insulation property against a lightning surge, A sheet plate having transparency to desired radio waves is sandwiched between the first plate and the first plate.
And a pair of fixed cover members are formed on the upper and lower parts of the flanges to join the second waveguide by joining and fixing them so as to sandwich the flanges. A lightning protection waveguide is obtained.

Further, according to the present invention, the fixed cover body is composed of a substantially U-shaped fixed cover and a fixed bar fitted in the fitting portion of the fixed cover, and the first and second conductive members are provided. The joining and fixing of the wave tube is performed by bolts / from one side to the other side of the pair of fixing bars via the pair of fixing covers.
A lightning protection waveguide is obtained which is characterized by being tightened with a nut.

Further, according to the present invention, in order to position the both flange portions, the first positioning plate and the first positioning plate each having a concave portion having a shape corresponding to the outer peripheral shape of the upper side and the lower side of the both flange portions, respectively. Two positioning plates are provided, and the recesses of the first and second positioning plates are brought into contact with the outer peripheral surfaces of the upper and lower sides of the flange portions, respectively, to thereby form the first and second waveguides. A lightning protection waveguide is obtained which is characterized in that the joint surface is positioned.

Further, according to the present invention, the first positioning plate and the second positioning plate are formed with fixing recesses near the left and right ends thereof, respectively, and the second positioning plate of the first positioning plate is formed. Is fixed to the positioning plate by tightening bolts / nuts from the recesses near the left and right ends of the first positioning plate to the recesses near the left and right ends of the second positioning plate. A characteristic lightning protection waveguide is obtained.

Further, according to the present invention, at least one choke groove is formed along the outer periphery of a side surface of at least one of the flange portions on the joint surface side of the waveguides. A lightning protection waveguide is obtained.

Further, according to the present invention, it occurs in both the waveguides between the opening surfaces between the first and second waveguides and in a state of being in contact with the surface of the sheet plate. A lightning protection waveguide is obtained which is provided with an iris having a window for eliminating reflected waves and adjusting transmission characteristics of radio waves.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIG. FIG. 1 (A) is a front view of a lightning protection waveguide according to the present invention, and shows a partially broken surface. 1B is a side view of FIG. 1A, and FIG. 1C is a plan view of FIG.

The built-in structure of the lightning protection waveguide in the present embodiment is such that a lightning surge is provided between the first waveguide 1 and the second waveguide 2 to which the flange portions 12 are fixedly attached. Is sandwiched between the sheet plates 3 which have an insulating property with respect to the above and have a transparency with respect to a desired radio wave. This seat plate 3
With this, it is possible to completely block the lightning surge transmitted to the waveguide.

Since the first waveguide 1, the second waveguide 2, and the sheet plate 3 are bonded and fixed to each other, the first waveguide 1 and the second waveguide 2 are formed.
A fixed cover body composed of a pair of substantially U-shaped fixed covers 5 and fixed bars 6 fitted in the fitting portions of the fixed covers 5 is provided on the upper and lower portions of both flanges 12 of the waveguide 2. The first waveguide 1 and the second waveguide 2 are joined and fixed by fixing the pair of fixing covers 5 by contacting the upper and lower portions of both flange portions 12 so that both flange portions 12 are sandwiched. A bolt 7a and a nut 7 are provided from one side to the other side of the pair of fixing bars 6 fitted in the fitting portion of the cover 5.
It is performed by tightening the bolt 7a using b.

A first positioning plate having a two-divided structure for positioning the outer peripheral surfaces of both flange portions 12, that is, for positioning the joint surface of the first waveguide 1 and the second waveguide 2. 8a and a second positioning plate 8b are provided. Specifically, each of the first positioning plate 8a and the second positioning plate 8b has a recess having a shape corresponding to the upper and lower outer peripheral shapes of the flanges 12, respectively. First and second
The concave portions of the positioning plates 8a and 8b are brought into contact with the upper and lower outer peripheral surfaces of the flange portions 12 to position the joint surfaces of the first waveguide 1 and the second waveguide 2 respectively. There is.

Fixing recesses 11 are formed in the first positioning plate 8a and the second positioning plate 8b in the vicinity of the left and right ends, respectively, and the second positioning plate 8 of the first positioning plate 8a is formed.
The mounting and fixing to b are performed so that the outer peripheral portions of both flanges are wrapped, respectively, from the recess 11 near the left and right ends of the first positioning plate 8a to the recess near the left and right ends of the second positioning plate 8b. 11 is performed by tightening the bolt 7a using the bolt 7a and the nut 7b. In this embodiment, the first waveguide 1 and the second waveguide 2 are bonded and fixed, and the first positioning plate 8a is fixed to the second positioning plate 8b by bolts / fixing. Although a nut is used, a bolt may be passed through from one side and a male screw (male groove) formed at the tip of the bolt may be screwed into a female screw (female groove) cut into the other.

With this, it is possible to prevent the joint step between the inner wall of the joint portion of the first waveguide 1 and the second waveguide 2 from being generated, and it is possible to smoothly transmit the radio wave in the waveguide. Becomes Here, as the material used for the fixed cover 5 and the positioning plate 8, a material having an insulating property against lightning surge, for example, resin is used to prevent the lightning surge from wrapping around from the waveguide body. The material used for the fixing bar 6 is a metal such as aluminum in consideration of mounting strength.
The material used for the sheet plate 3 is, for example, Teflon, which has insulation and radio wave transmission.

On the other hand, the sheet plate 3 transmits the electric wave in the waveguide, but cuts off the inside of the waveguide.
Is provided, the propagation path of the radio wave is disturbed, and a reflected wave and a leaky wave that adversely affect communication are generated. In order to eliminate this reflected wave and adjust the transmission characteristics of the radio wave, the contact was made between both opening surfaces between the first waveguide 1 and the second waveguide 2 and on the surface of the sheet plate 3. In this state, an iris 10 having a window for adjustment is provided. In order to eliminate (absorb) the leaky wave, a choke groove 4 is formed on the side surface of at least one of the flange portions 12 on the joint surface side of the waveguides 1 and 2 along the outer periphery thereof.
Two are formed. The shape of the choke groove 4 is determined so as not to leak when a desired frequency band passes, and in the present embodiment, the flange portion 1 on the first waveguide 1 side is formed.
2. In this case, the number of choke grooves 4 may be one or more. Further, it may be provided on the flange portion 12 on the second waveguide 2 side, or may be provided on both flange portions 12.

It should be noted that, from the present embodiment, it is possible to easily infer a fixing method of fixing the joint portion of the two waveguides with an insulating resin.

[0019]

As described above, according to the present invention, the waveguide structure having the insulation property against the lightning surge is provided.
Only by incorporating the lightning protection waveguide of the present invention into a part of the connecting waveguide connecting the transmission / reception antenna to the wireless communication device, it is possible to completely prevent intrusion of lightning surge into the wireless communication device, and under any external environment. It is possible to construct a communication system that enables stable communication.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 1st waveguide 2 2nd waveguide 3 sheet plate 4 choke groove 5 fixed cover 6 fixed bar 7a bolt 7b nut 8a 1st positioning plate 8b 2nd positioning plate 10 iris 11 hollow 12 flange part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Manabu Kinoshita 5-7-1 Shiba, Minato-ku, Tokyo Inside NEC Corporation (72) Inventor Takashi Koshio 3-50, Kamiishihara, Chofu-shi, Tokyo 1 Inten Co., Ltd. (72) Inventor Hajime Takakura 3-50 Kamiishihara, Chofu, Tokyo 1 Inten Co., Ltd. (72) Inventor Yoshiaki Kobayashi 1-3-3 Uchiyuki-cho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Ltd. (72) Inventor Tadao Watanabe 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc.

Claims (6)

[Claims] 1. A first waveguide and a second waveguide, each of which has a flange portion, has an insulating property against a lightning surge and is transparent to a desired radio wave. A sheet plate having the same is sandwiched, and a pair of fixed cover members are respectively joined and fixed to the upper and lower portions of the flange portions so as to sandwich the flange portions in order to couple the first and second waveguides. A waveguide for lightning protection, which is formed by: 2. The fixed cover body comprises a substantially U-shaped fixed cover and a fixed bar fitted in a fitting portion of the fixed cover, and the first and the second waveguides are joined and fixed together. 2. The lightning protection waveguide according to claim 1, wherein bolts / nuts are tightened from one of the pair of fixing bars to the other through the pair of fixing covers. 3. A first positioning plate and a second positioning plate each having a concave portion having a shape corresponding to the outer peripheral shape on the upper side and the lower side of the both flange portions, respectively, for positioning the both flange portions. , The recesses of the first and second positioning plates are brought into contact with the upper and lower outer peripheral surfaces of the flange portions, respectively, to position the joint surfaces of the first and second waveguides. The lightning protection waveguide according to claim 1 or 2, wherein. 4. The first positioning plate and the second positioning plate are provided with fixing recesses near the left and right ends, respectively, and the first positioning plate is attached to the second positioning plate. The fixing is performed by tightening bolts / nuts from a recess near the left and right ends of the first positioning plate to a recess near the left and right ends of the second positioning plate, respectively. The lightning protection waveguide described. 5. At least one choke groove is formed along the outer periphery of a side surface of at least one flange portion of the both flange portions on the joint surface side of the both waveguides. The lightning protection waveguide according to claim 1. 6. A radio wave for eliminating a reflected wave generated in both of the waveguides between the opening surfaces between the first and second waveguides and in a state of being in contact with the surface of the sheet plate. 6. The lightning protection waveguide according to claim 1, further comprising an iris having a window for adjusting the transmission characteristic of the lightning protection waveguide.