201122529 六、發明說明： 【發明所屬之技術領域】 本發明是一種反射器，尤其是關於一種作a 作马雷達偵測 用途之電磁波反射器。 【先前技術】 相反於匿蹤之功能，角反射器的目的就是要讓人射的 電磁波以最大的幅度反射回電磁波入射方向，讓雷達&夠 偵測該角反射器的位置’如此，武器裝備或安裝有角反射 器的標的可以刻意的顯示自己的位置，藉此達到定位、欺 敵誘敵、警示、校正、船隻間避撞、河道安全攀示等功处 ’因此角反射器已經普遍地用於民生與軍事用途。 請參考第一圖及第二圖，一般角反射器是透過三個相 互垂直（0 =90° )的高電磁波反射板體組成，如此，特定 入射角範圍的電磁波可以幾乎全部反射回到入射方向，因 此’雷達或電磁波接收端可以藉此判斷角反射器或標的的 位置。 然而，前述的角反射器在應用上有幾個非常不便的問 通。既有角反射器的有效視角（viewing angle)窄小，當偵 測源超過有效視角時，角反射器的反射方向將偏異而無法 被須測源接收’因此出現所謂的偵測盲點或死角。舉例而 言’當一飛機以低空接近裝有傳統角反射器的乾船時，飛 機所發射的雷連波則將無法有效反射飛機的接受器，形成 前述的偵測盲點或死角的問題。究其原因，其係因為飛機 接近水平面而與角反射器呈現低俯仰角入射的狀態，造成 201122529 前述的問題。當然，水平接近安裝傳統角反射器的靶船對 武器所安裝的偵測雷達也會遭遇相同的問題，而使武器偵 測不到靶船的位置。 【發明内容】 為了解決既有的角反射器在某些角度應用範疇容易超 出適用入射角度範圍的問題，本發明藉由將立體反射結構 置於一四角錐底座之表面，藉以解決前述角反射器不適合 用於水平接近（低俯仰角）等類似的用途的窘境，達到擴 大角反射器適用角度的目的。 配合解決前述技術問題及發明目的，本發明提供—種 具寬視角的角反射器，其包含一四角錐底座以及分別固定 設於該四角錐底座之四個斜側壁表面之四個反射結構，其 中，該四角錐底座之四個斜側壁表面及該反射結構之表面 導電，四個該反射結構分別固定置於該四角錐底座之斜側 壁表面；每一反射結構包含兩個片狀且互相垂直之導電片 體，每一個該反射結構之兩個導電片體與對應之其中之一 斜側壁均相互垂直。 其中’該四角錐底座之斜側壁與該四角錐底座之一水 平底面之失角範圍為大於零至30度之間。 其中’該導電片體為1 /4圓片狀，且四個該反射結構 兩兩抵靠並分別置於該四角錐底座之斜側壁表面。 其中，該四角錐底座及該反射結構為金屬材質製成。 其中’該四角錐底座及該反射結構為表面高導電 合材料。 201122529 其中，該複合材料為碳纖維板、玻璃纖維板或三明治 結構。 /α 其中，該具寬視角的角反射器進一步包含一透波外罩 ’該透波外罩為-半圓頂狀之罩體，其罩設於該反射結構 後與該四角錐底座固定結合。 藉此’本實施例相較於既有的角反射器，其在入射電 磁波或雷達波處於低俯仰角狀態下可以獲得彳艮大的雷達截 面積，因此，非常適合應用於低俯仰角的用途，例如靶機 、靶船、河道船舶警示，達到在低俯仰角亦具備大範圍之 視角的技術效果。 【實施方式】 請參考第三〜五圖，其為本發明之具寬視角的角反射 器（1 〇)之較佳實施例，其包含一四角錐底座（）2)以及 分別固定設於該四角錐底座（12 )之四個斜側壁表面之四 個反射結構（14)，其中，該四角錐底座（12)之四個斜 側壁表面及該反射結構（14 )之表面導電，使入射電磁皮 、雷達波可產生反射。 四個反射結構（14)兩兩抵靠固定置於該四角錐底座 (12 )之四個斜側壁表面；每一反射結構（，4 )包含兩個 片狀且互相垂直之導電片體，本實施例之導電片體呈1/4 圓片狀；每一個該反射結構（14 )之兩個導電片體與對應 之其中之一斜側壁均相互垂直。該四角錐底座（12 ) )^7* 側壁與§亥四角錐底座（12)之一水平底面之夾角範圍為大 於零至30度之間，本實施例之該夹角為2〇度。 201122529 請參考第六圖，本實施例之四角錐底座（彳2)的尺寸 為1580X1 580mm2，當入射電磁波（雷達波）相對於本實 施例處於低俯仰角狀態時，不同的旋轉角可以獲得相對較 寬的視角（viewing angle)。如圖所示，本實施例可以獲得 500m2(〜27dBsm)以上的視角範圍為a，其遠大於既有的 角反射器的視角範圍B。 進一步地’為了讓本實施例可以實際安裝於船舶或運 輸器具等載體而不增加載體行進時的空氣阻力，本實施例 豢 包含一透波外罩’該透波外罩為以電磁波可穿透材料（如 石英纖維、玻璃纖維…）所製成的一半圓頂狀之罩體，其 罩設於該反射結構（14 )後與該四角錐底座（彳2)固定結合 〇 在材質方面，該四角錐底座（12)及該反射結構（14 )可以為金屬材質或表面高導電的複合材料，所謂的複合 材料係可包含金屬鍍層表面的碳纖維板、玻璃纖維板或三 鲁 明治結構製成的該四角錐底座（12 )及該反射結構（’ 4 ) 因此，本實施例相較於既有的角反射器，其在入射電 磁波或雷達波處於低俯仰角狀態下可以獲得很大的雷達戴 面積，因此，非常適合應用於低俯仰角的用途，例如靶機 '靶船、河道船舶警示。 【圖式簡單說明】 第一圖為既有之角反射器立體示意圖。 第二圖為既有之角反射器電磁波入射反射方向示意圖 6 201122529 第三圖為本發明較佳實施例之立體示意圖。 第四圖為本發明較佳實施例之側視示意圖。 第五圖為本發明較佳實施例之俯視示意圖。 第六圖為既有角反射器與本發明較佳實施例之雷達截 面積量測結果圖。 【主要元件符號說明】 • (1〇)具寬視角的角反射器 (12)四角錐底座 (14 )反射結構201122529 VI. Description of the Invention: [Technical Field] The present invention relates to a reflector, and more particularly to an electromagnetic wave reflector for use as a radar detection. [Prior Art] Contrary to the function of stealth, the purpose of the corner reflector is to reflect the electromagnetic wave emitted by the human body to the incident direction of the electromagnetic wave with the maximum amplitude, so that the radar & can detect the position of the corner reflector. Equipped with or equipped with a corner reflector, you can deliberately display your position, thereby achieving positioning, bullying, warning, correction, collision between boats, river safety, etc. The land is used for people's livelihood and military purposes. Referring to the first and second figures, the general corner reflector is composed of three mutually perpendicular (0 = 90°) high electromagnetic wave reflecting plate bodies, so that electromagnetic waves of a specific incident angle range can be almost completely reflected back to the incident direction. Therefore, the 'radar or electromagnetic wave receiving end can be used to judge the position of the corner reflector or the target. However, the aforementioned corner reflectors have several very inconvenient problems in application. The angle of view of the existing corner reflector is narrow. When the detection source exceeds the effective angle of view, the reflection direction of the corner reflector will be different and cannot be received by the source to be tested. Therefore, so-called detection of blind spots or dead angles occurs. . For example, when an aircraft approaches a dry ship equipped with a conventional corner reflector at a low altitude, the Rayleigh wave emitted by the aircraft will not effectively reflect the receiver of the aircraft, forming the aforementioned problem of detecting blind spots or dead ends. The reason is that the aircraft is approaching the horizontal plane and the corner reflector is in a state of low elevation angle incident, resulting in the aforementioned problem of 201122529. Of course, a target ship mounted close to a conventional corner reflector will encounter the same problem with the detection radar installed on the weapon, and the weapon will not detect the position of the target ship. SUMMARY OF THE INVENTION In order to solve the problem that the existing corner reflector is easily beyond the applicable incident angle range in some angles, the present invention solves the above-mentioned corner reflector by placing the stereoscopic reflective structure on the surface of a quadrangular pyramid base. It is not suitable for the dilemma of similar applications such as horizontal approach (low pitch angle), so as to expand the angle of application of the corner reflector. In order to solve the foregoing technical problems and the object of the invention, the present invention provides a corner reflector having a wide viewing angle, comprising a quadrangular pyramid base and four reflective structures respectively fixed on four inclined side wall surfaces of the quadrangular pyramid base, wherein The four inclined side wall surfaces of the quadrangular pyramid base and the surface of the reflective structure are electrically conductive, and the four reflective structures are respectively fixed on the inclined side wall surface of the quadrangular pyramid base; each reflective structure comprises two sheets and are perpendicular to each other. The conductive sheet body, the two conductive sheets of each of the reflective structures and one of the corresponding oblique side walls are perpendicular to each other. Wherein the angular extent of the inclined side wall of the quadrangular pyramid base and the horizontal bottom surface of the quadrangular pyramid base is greater than zero to 30 degrees. Wherein the conductive sheet is 1/4 disc-shaped, and the four reflecting structures are abutted against each other and respectively placed on the inclined side wall surface of the quadrangular pyramid base. Wherein, the quadrangular pyramid base and the reflective structure are made of metal material. Wherein the quadrangular pyramid base and the reflective structure are surface highly conductive materials. 201122529 wherein the composite material is a carbon fiber board, a fiberglass board or a sandwich structure. /α, wherein the corner reflector having a wide viewing angle further comprises a transflective cover. The transflective cover is a semi-dome-shaped cover, and the cover is fixedly coupled to the quadrangular pyramid base after the reflective structure. Therefore, the present embodiment can obtain a large radar cross-sectional area when the incident electromagnetic wave or the radar wave is at a low elevation angle compared to the existing corner reflector, and therefore, it is very suitable for the application of the low elevation angle. For example, target aircraft, target ships, and river vessel warnings have the technical effect of achieving a wide range of viewing angles at low elevation angles. [Embodiment] Please refer to the third to fifth figures, which are preferred embodiments of the wide angle viewing angle reflector (1 〇) of the present invention, comprising a quadrangular pyramid base () 2) and respectively fixed on the Four reflective structures (14) of four oblique sidewall surfaces of the quadrangular pyramid base (12), wherein the four inclined sidewall surfaces of the quadrangular pyramid base (12) and the surface of the reflective structure (14) are electrically conductive to make incident electromagnetic Skin and radar waves can produce reflections. Four reflective structures (14) are fixedly placed on the four inclined side wall surfaces of the four-corner base (12); each reflective structure (4) comprises two sheet-like and mutually perpendicular conductive sheets, The conductive sheets of the embodiment are in the form of 1/4 discs; the two conductive sheets of each of the reflective structures (14) and the corresponding one of the oblique side walls are perpendicular to each other. The angle between the side wall of the quadrangular pyramid base (12) and the horizontal bottom surface of one of the four corner pyramid bases (12) is greater than zero to 30 degrees, and the angle of the embodiment is 2 degrees. 201122529 Please refer to the sixth figure. The size of the quadrangular pyramid base (彳2) of this embodiment is 1580×1 580 mm2. When the incident electromagnetic wave (radar wave) is in the low elevation angle state with respect to the embodiment, different rotation angles can be obtained. A wider viewing angle. As shown, the present embodiment can obtain a viewing angle range of 500 m2 (~27 dBsm) or more, which is much larger than the viewing angle range B of the existing corner reflector. Further, in order to allow the present embodiment to be physically mounted on a carrier such as a ship or a transportation device without increasing the air resistance when the carrier travels, the present embodiment includes a wave-transmission cover which is an electromagnetic wave-permeable material ( A half dome-shaped cover made of quartz fiber, glass fiber, etc., is disposed on the reflective structure (14) and fixedly coupled with the quadrangular pyramid base (彳2), in terms of material, the quadrangular pyramid The base (12) and the reflective structure (14) may be a metal material or a highly conductive composite material. The so-called composite material may include a carbon fiber plate on a metal plating surface, a fiberglass plate or a square pyramid made of a Sanlu Meiji structure. The base (12) and the reflective structure ('4). Therefore, compared with the existing corner reflector, the present embodiment can obtain a large radar wearing area when the incident electromagnetic wave or the radar wave is at a low elevation angle. It is very suitable for applications with low pitch angles, such as target aircraft 'target ship, river ship warning. [Simple description of the diagram] The first figure is a three-dimensional diagram of the existing corner reflector. The second figure is a schematic diagram of the incident direction of the electromagnetic wave incident of the existing corner reflector. 6 201122529 The third figure is a perspective view of a preferred embodiment of the present invention. The fourth figure is a side view of a preferred embodiment of the invention. Figure 5 is a top plan view of a preferred embodiment of the present invention. Figure 6 is a graph showing the measurement results of the radar cross-sectional area of the existing corner reflector and the preferred embodiment of the present invention. [Main component symbol description] • (1〇) corner reflector with wide viewing angle (12) Square pyramid base (14) reflection structure