JPS56134802A - Radio wave reflector formed with expanded metal - Google Patents
Radio wave reflector formed with expanded metalInfo
- Publication number
- JPS56134802A JPS56134802A JP3727280A JP3727280A JPS56134802A JP S56134802 A JPS56134802 A JP S56134802A JP 3727280 A JP3727280 A JP 3727280A JP 3727280 A JP3727280 A JP 3727280A JP S56134802 A JPS56134802 A JP S56134802A
- Authority
- JP
- Japan
- Prior art keywords
- reflection
- wave
- waves
- plates
- alpha
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
PURPOSE:To reduce downward reflection, by reflecting the incident wave upward to minimize the range of the downward reflection wave and by selecting diemsions of slope steps to cancell reflection waves with each other, in the reflective plate formed with the expanded metal. CONSTITUTION:Slope step-form reflective plates 5-7 are so constituted that the horizontal pitch is H and the inclined angle is (r) and path difference (d) of propagation between reflection waves 10 and 11 of radio waves 8 and 9 is an integral multiple of wavelength lambda. That is, they satisfy d=nlambda=Hsin2r. For the purpose of preventing the reflection wave reflected by the substrate, horizontal closed plates 20 which operate as the second reflective plates are provided between steps. Closed plates 20 are inclined inside at alpha, and alpha=(90 deg.-3r)/2 is satisfied to set angle alpha=90 deg.-2r-2alpha of reflection wave 23 to the vertical to (r). If length H/cosr of each slope step is set to an odd mutliple of the half wavelength of the radio wave, reflection waves from closed parts between respective steps are cancelled by one another. In this case, H/cosr=(2m+1)lambda/2 is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3727280A JPS56134802A (en) | 1980-03-24 | 1980-03-24 | Radio wave reflector formed with expanded metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3727280A JPS56134802A (en) | 1980-03-24 | 1980-03-24 | Radio wave reflector formed with expanded metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56134802A true JPS56134802A (en) | 1981-10-21 |
Family
ID=12493035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3727280A Pending JPS56134802A (en) | 1980-03-24 | 1980-03-24 | Radio wave reflector formed with expanded metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56134802A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59185410A (en) * | 1983-04-06 | 1984-10-22 | Unyusho Senpaku Gijutsu Kenkyusho | False image suppressing device of radar |
| JPS59211303A (en) * | 1983-05-16 | 1984-11-30 | Maspro Denkoh Corp | Reflector for high frequency communication signal |
| US4513293A (en) * | 1981-11-12 | 1985-04-23 | Communications Design Group, Inc. | Frequency selective antenna |
| JPS60193704U (en) * | 1984-06-01 | 1985-12-23 | 旭硝子株式会社 | Conductor for radio wave reflection |
| JPH01132109U (en) * | 1988-03-04 | 1989-09-07 | ||
| ES2104496A1 (en) * | 1994-07-12 | 1997-10-01 | Campos Irujo Antonio | Electromagnetic microwave reflector. |
| JP2014127950A (en) * | 2012-12-27 | 2014-07-07 | Toshiba Corp | Radio wave reflector |
-
1980
- 1980-03-24 JP JP3727280A patent/JPS56134802A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513293A (en) * | 1981-11-12 | 1985-04-23 | Communications Design Group, Inc. | Frequency selective antenna |
| JPS59185410A (en) * | 1983-04-06 | 1984-10-22 | Unyusho Senpaku Gijutsu Kenkyusho | False image suppressing device of radar |
| JPS59211303A (en) * | 1983-05-16 | 1984-11-30 | Maspro Denkoh Corp | Reflector for high frequency communication signal |
| JPS60193704U (en) * | 1984-06-01 | 1985-12-23 | 旭硝子株式会社 | Conductor for radio wave reflection |
| JPH01132109U (en) * | 1988-03-04 | 1989-09-07 | ||
| ES2104496A1 (en) * | 1994-07-12 | 1997-10-01 | Campos Irujo Antonio | Electromagnetic microwave reflector. |
| JP2014127950A (en) * | 2012-12-27 | 2014-07-07 | Toshiba Corp | Radio wave reflector |
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