TWI738582B - Reflectarray antenna - Google Patents

Abstract

A reflectarray antenna is provided. The reflectarray antenna includes a feeding antenna and a reflectarray. The feeding antenna includes the radiator of the cross-type dipole antenna. The reflectarray is used for reflecting electromagnetic waves emitted from the feeding antenna. The reflectarray includes a first medium plate, a second medium plate, a first insulation plate, a second insulation, and a reflect metal plate. The first medium plate includes a first reflecting unit array. The second medium plate includes a second reflecting unit array. The first and second reflecting units are arranged according to a radiation pattern to-be-formed by the reflectarray. The first insulation plate is located between the first medium plate and the second medium plate. The second insulation plate is located between the second medium plate and the reflect metal plate. The first medium plate, the first insulation plate, the second medium plate, the second insulation plate, and the reflect metal plate are stacked in order.

Description

Reflective array antenna

The present invention relates to a reflective antenna, and particularly relates to a reflective array antenna suitable for indoor environments.

In view of the indoor environment coverage requirements of mobile communication networks (for example, indoor fields such as the distribution of terraced seats), it is often necessary to achieve the signal intensity distribution in a specific area by means of a strip-shaped antenna scheme. The existing practice uses a parabolic reflector antenna. For example, the new patent TWM531660U proposes a dish antenna with a planar radiating field. By appropriately controlling the incident angle of the feed antenna, a specific field synthesis effect can be achieved. However, this type of antenna may have the disadvantages of heavy structure and high manufacturing difficulty. In particular, the design curvature of the dish antenna is not easy to control, and often depends on the processing accuracy. In addition, the existing practice also proposes an active antenna system, which introduces active components such as a phase shifter and an amplitude adjuster to obtain a specific beam synthesis effect. However, this type of antenna system still has the disadvantages of high cost and high power consumption.

Another existing practice is a reflective array antenna. For example, the reflective array antenna design of the new patent TWM412478U can produce a focusing effect of radiated energy in the near field of the antenna. However, this reflect array antenna cannot produce a large range of radiation coverage in the far field. In addition, because the feed antenna is a patch antenna, there is a problem of insufficient impedance bandwidth. In addition, most reflect arrays are mainly used in satellite communications, so they need to have antenna field characteristics with high antenna gain and narrow beam width. Moreover, the area of these reflective arrays is quite large. If this huge reflector array is hung directly on the indoor wall, it will appear quite abrupt and will be easily affected by nearby furniture or furnishings, which will affect its electromagnetic radiation characteristics. Therefore, the feeds of the existing reflect arrays are still mostly single-polarized, and belong to point-to-point transmission applications. It is still difficult to extend the single-polarization feed to the multiple-input multiple-output antenna system.

In view of this, the present invention provides a reflective array antenna, which combines a dual-polarized dipole antenna feed and a stacked reflective array, so as to be suitable for adjusting the antenna field to be formed, and further suitable for signal coverage in an indoor environment.

The reflective array antenna of the embodiment of the present invention includes a feed antenna and a reflective array. The feed antenna includes the radiator of a crossed dipole antenna, the polarization direction of which is orthogonal. The reflective array is used to reflect the electromagnetic waves radiated by the feed antenna. The reflective array includes a first dielectric substrate, a second dielectric substrate, a first insulating plate, a second insulating plate, and a reflective metal plate. The first dielectric substrate includes a first reflective unit array. The first reflecting unit array includes a plurality of first reflecting units, and the first reflecting units are arranged according to the radiation pattern to be formed by the reflecting array. The second dielectric substrate includes a second reflective unit array. The second reflecting unit array includes a plurality of second reflecting units, and those second reflecting units are arranged according to the radiation pattern to be formed by the reflecting array. The first insulating plate is arranged between the first dielectric substrate and the second dielectric substrate. The second insulating plate is arranged between the second dielectric substrate and the reflective metal plate. The first dielectric substrate, the first insulating plate, the second dielectric substrate, the second insulating plate and the reflective metal plate are sequentially stacked.

Based on the above, in the reflective array antenna of the embodiment of the present invention, the feed antenna uses a cross-type dipole antenna, and the reflective array includes stacked substrates. Part of the substrate is provided with an array of reflection units arranged according to the radiation field pattern. In this way, the focusing effect of the overall radiation energy can be improved. In addition, the reflect array can be installed in an indoor space (for example, on a ceiling), and the reflect array antenna of the embodiment of the present invention can be integrated with the indoor field without being obtrusive.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a reflective array antenna 50 installed in an indoor space according to an embodiment of the present invention. Please refer to FIG. 1, the reflective array is another antenna solution that can be selected to synthesize a specific radiation pattern. This structure is flat, light and thin, and is purely passive, and can achieve beam-shaping through the phase distribution unit. The basic structure of the reflect array antenna 50 includes a feed antenna 3 and a reflect array 10. The reflector array 10 is responsible for reflecting the electromagnetic waves radiated by the feed antenna 3 and performing secondary focusing of the electromagnetic waves, so that the antenna radiation energy of the reflector array antenna 50 is refocused on the area to be covered.

The indoor deployment method shown in FIG. 1 is to erect the reflective array 10 under the ceiling 2. For example, the upper side of the reflective array 10 is installed on the ceiling 2. More specifically, FIG. 2 is a schematic diagram of installing the reflective array 10 on the ceiling 2 according to an embodiment of the present invention. Referring to FIG. 2, the user can remove any calcium silicate board or plastic PVC board 11 from any ceiling 2, and then place the reflector array 10 of the embodiment of the present invention in the removed position and adjacent to the light steel ceiling. The frames 12 are locked to each other (but not limited to a fixing method) to be surely fixed under the ceiling 2. It is worth noting that the reflective array 10 of the embodiment of the present invention is fabricated through stacked dielectric substrates 4, 5 (for example, printed circuit boards), insulating plates 6, 7 (for example, composed of insulating plates or other insulating materials), and It is realized by a reflective metal plate 8, so the reflector array 10 has the characteristics of light weight, and can be directly pasted under the calcium silicate plate or plastic PVC plate 11 of the ceiling 2 to complete the erection of the reflector array 10. Subsequent embodiments will further introduce the reflective array 10 in detail.

In addition to the reflective array 10, the constituent object of the reflective array antenna 50 also includes a feed antenna 3. Since the feed antenna 3 cannot be too far away from the reflect array 10, the feed antenna 3 is erected on the wall 1 adjacent to the reflect array 10 in the embodiment of the present invention. As shown in FIG. 1, electromagnetic waves 9 are emitted from the feed antenna 3 toward the reflective array 10. The reflector array on the reflector array 10 refocuses the antenna radiation energy on the area to be covered. Among them, the reflective unit array will be introduced in subsequent embodiments.

FIG. 3 is a schematic diagram of the reflective array antenna 50 installed in the classroom 13 according to an embodiment of the present invention. Please refer to FIG. 3, taking the classroom 13 field as an example, the feed antenna 3 and the reflection array 10 can be erected in a corner of the classroom 13 in use. With the refocusing characteristic of the radiation energy of the reflective array 10, the signal receiving intensity of different positions in the classroom 13 can be adjusted, so that users in the covered area can have good communication quality.

It should be noted that the reflect array antenna 50 is not limited to be installed in a specific indoor environment, and may even be installed outdoors through other fixing parts (for example, a steel frame, an iron column, etc.).

In order to ensure good communication quality, the current mobile communication system simultaneously excites two antennas arranged in different directions to form electromagnetic wave polarizations in different directions. For example, ±45 degree dual-polarized antenna design. This technique is called polarization diversity. In the embodiment of the present invention, it is also designed to meet the needs of polarization diversity.

FIG. 4 is a perspective view of the feed antenna 3 according to an embodiment of the present invention, and FIG. 5 is a side view of the feed antenna 3 according to an embodiment of the present invention. 4 and 5, the feed antenna 3 includes a plurality of pointer substrates 100, 101, a cross-type dipole antenna radiator 102, a supporting column 103, balun circuits 104, 105, and a metal base 106.

The feed antenna design shown in the figure is called a dual-polarized cross-dipole antenna with orthogonal polarization directions. For example, ±45 degrees. Generally speaking, since the traditional dual-polarized cross dipole antenna can provide the radiation pattern of the dual-polarized antenna at the same time, it is widely used in mobile communication base stations. However, if considering the feed antenna 3 as the reflective array antenna 50, its half-power beam width is too large (usually around 60 degrees), which will lead to radiation energy spillover (spillover) and poor focusing effect of the reflective array, etc. problem.

In the embodiment of the present invention, in addition to the radiator 102 of the cross-type dipole antenna, the director substrates 100 and 101 are added. The pointer substrates 100 and 101 are respectively arranged in parallel with the radiator 102 and are separated from the radiator 102 at different distances. For example, the pointer substrate 100 is closer to the radiator than the pointer substrate 101 (ie, the distance is closer). In addition, each of the pointer substrates 100 and 101 is provided with a pointer to reduce the half-power radiation beam width of the feed antenna 3.

It should be noted that the number and location of the pointing device substrates 100 and 101 can be adjusted according to requirements, which is not limited by the embodiment of the present invention.

In assembly, four vertical support columns 103 (for example, hexagonal nylon columns) can be used to support the pointer substrates 100 and 101 to a specific height. In order to create a dual-polarized antenna radiation pattern at the same time, two coaxial transmission lines 107 will be connected to the feed antenna 3 from the back-end equipment of the base station, and the signals from the back-end equipment of the base station will be further increased through the two balun circuits 104 and 105 arranged in cross. It is transferred to the radiator 102 of the cross-type dipole antenna and the pointer substrates 100, 101.

In order to smoothly install the feed antenna 3 on the wall 1 as shown in FIG. 1, FIG. 6 is a schematic diagram of the tilt angle adjustment seat 200 combined with the main body according to an embodiment of the present invention. Please refer to FIG. 6, the tilt angle adjustment seat 200 includes components 201 to 204. The main body of the feed antenna 3 can be locked to each other through the metal base 106 and the upper half 201 of the tilt adjustment base 200. The lower half 202 of the tilt angle adjustment seat 200 is locked to the wall 1 to secure the feed antenna 3 on the wall 1. The upper half 201 and the lower half 202 of the inclination adjusting seat 200 can be connected to each other through the rotating shaft 204.

Fig. 7 is a schematic diagram illustrating the adjustment of the inclination angle of the reclining seat according to an embodiment of the present invention. Please refer to FIG. 7, since the main beam direction (Boresight) of the feed antenna 3 should point to the exact center of the reflect array 10, the elevation angle of the feed antenna 3 needs to be adjusted appropriately. Since the upper half 201 of the tilt angle adjustment seat 200 and the lower half 202 are connected to each other by the rotation axis 204, the rotation axis 204 can be regarded as the rotation axis of the feed antenna 3 in the adjustment of the pitch angle, and the tilt angle adjustment The rotating scale 203 on the base 200 can accurately adjust the main beam direction 205 of the feed antenna 3.

It should be noted that the structure and operation of the tilt angle adjustment seat 200 are not limited to the embodiments shown in FIG. 6 and FIG. 7, and the user can change it according to actual needs.

Regarding the reflective array 10, FIG. 8 is an exploded view of the reflective array 10 according to an embodiment of the present invention. Please refer to FIG. 8, the reflective array 10 is a five-layer stacking design. Wherein, the reflective array 10 includes a first layer of dielectric substrate 300, a second layer of insulating plate 301, a third layer of dielectric substrate 302, a fourth layer of insulating plate 303, and a fifth layer of reflective metal plate 304 (for example, corresponding The dielectric substrates 4 and 5, the insulating plates 6, 7 and the reflective metal plate 8 in FIG. 1). The stacking sequence is the dielectric substrate 300, the insulating plate 301, the dielectric substrate 302, the insulating plate 303, and the reflective metal plate 304 in order. If it is installed on the ceiling 2, the reflective metal plate 304 is closest to the ceiling 2, and the dielectric substrate 300 is the farthest away from the ceiling 2.

The dielectric substrates 300 and 302 each have a pair of reflective unit arrays 305 and 306. It is worth noting that, in order to ensure that the reflective array 10 has a good radiant energy focusing effect, the reflective unit arrays 305 and 306 on the reflective array 10 are arranged in a circular-like manner. FIG. 9 is a front view of the reflect array 10 according to an embodiment of the present invention. Please refer to FIG. 9, the reflection units 350 of the reflection unit array 305 (the diamond-shaped part in the figure) are all confined within the circle 307. That is, the overall outline of the reflection unit array 305 is circular. In addition, the overall outline of the reflective unit array 306 and the reflective metal plate 304 are also circular.

It should be noted that in other embodiments, the overall outline of the reflective unit arrays 305 and 306 and the shape of the reflective metal plate are also octagonal, twelve-corner or other geometric shapes. In addition, the overall contours of the reflective unit arrays 305 and 306 and the shape of the reflective metal plate are approximately the same geometric figures. For example, the circle 307 shown in FIG. 9 is not limited to this.

In addition, FIG. 10 is a schematic diagram of a lattice structure according to an embodiment of the present invention. Referring to FIG. 10, compared with the traditional reflect array antenna design, the reflector units 350 in the reflector arrays 305 and 306 of the embodiment of the present invention adopt a rhombus design and are arranged in a staggered manner, so as to achieve a dual-polarized antenna radiation pattern. That is, the reflective units are arranged according to the radiation field pattern to be formed by the reflective array 10.

In one embodiment, the reflective units 350 of the reflective unit array 305 are arranged on the dielectric substrate 300 according to the lattice structure, and the reflective units 350 of the reflective unit array 306 are arranged on the dielectric substrate 302 according to the lattice structure. The staggered arrangement (ie, lattice structure) of the reflective unit arrays 305, 306 is based on the virtual grid 308 shown in FIG. The plumb line part can be further divided into two parts, the odd-numbered plumb line 309 (that is, the sorted in the odd-numbered) and the even-numbered plumb line 310 (that is, the even-numbered line) arranged in sequence. As shown in FIG. 10, the reflection unit 350 is disposed at the intersection of the odd-order plumb line 309 and the horizontal line 311 and the intersection of the even-order plumb line 310 and the horizontal line 311.

…(1) 其中，

為空氣波長，

為饋源之相位中心至第

個反射單元350的距離(例如，圖中所示距離

、

)，

為第

個反射單元350到反射陣列10的輻射波前的距離(例如，圖中所示距離

、

)，

為第

個反射單元350的輻射距離修正值(高天線增益的反射陣列10之輻射波前WF1和經波束形塑的反射陣列10之輻射波前WF1之間的距離差值)(例如，圖中所示修正值

、

)，

為第

個反射單元350所造成的反射相位變化(反射單元350的大小與反射相位有關) (例如，圖中所示反射相位

、

)，而

為固定之任意常數值。 It is worth noting that the lattice structure is related to the radiation field pattern to be formed by the reflector array 10. Different from the existing design, the embodiment of the present invention adopts a beam-shaping technology antenna field shape synthesis method. FIG. 11 is a schematic diagram illustrating the radiation field pattern according to an embodiment of the present invention. Referring to FIG. 11, the embodiment of the present invention needs to further consider the radiation wavefront WF2 of the expected radiation field shape. The arrangement of the reflecting unit 350 is related to the following equation (1):

…(1) Among them,

Is the air wavelength,

Is the phase center of the feed to the first

The distance of each reflecting unit 350 (for example, the distance shown in the figure

,

),

For the first

The distance between the reflection units 350 and the radiation wavefront of the reflection array 10 (for example, the distance shown in the figure

,

),

For the first

The radiation distance correction value of each reflection unit 350 (the distance difference between the radiation wavefront WF1 of the reflective array 10 with high antenna gain and the radiation wavefront WF1 of the beam-shaped reflective array 10) (for example, as shown in the figure) Correction value

,

),

For the first

The reflection phase change caused by the reflection unit 350 (the size of the reflection unit 350 is related to the reflection phase) (for example, the reflection phase shown in the figure

,

),and

It is a fixed arbitrary constant value.

，且為了符合前述方程式(1)，反射單元350的大小也需要對應調整。在本發明實施例中，反射單元350的大小將依據輻射場型的涵蓋範圍所決定。此外，如圖9所示，不同大小的反射單元350在反射單元陣列305,306中左右對稱，可確保不同極化之天線場型能保持相同輻射特性。即，以反射單元陣列305,306的中線為基準的左右兩側反射單元350鏡射排列。由此可知，反射單元陣列305或306的反射單元350中的一者的大小可能與另一者不同。 Changes in the radiation pattern (which may change the radiation wavefront) may change the correction value

In order to comply with the aforementioned equation (1), the size of the reflection unit 350 also needs to be adjusted accordingly. In the embodiment of the present invention, the size of the reflection unit 350 will be determined according to the coverage of the radiation field pattern. In addition, as shown in FIG. 9, the reflection units 350 of different sizes are symmetrical in the reflection unit arrays 305 and 306, which can ensure that antenna patterns of different polarizations can maintain the same radiation characteristics. That is, the reflection units 350 on the left and right sides with the center line of the reflection unit arrays 305 and 306 as a reference are arranged in mirror. It can be seen that the size of one of the reflection units 350 of the reflection unit array 305 or 306 may be different from the other.

度兩不同極化的天線輻射場型特性趨於一致，菱形金屬貼片400,401的對角線長度有以下限制：

和

(即，各自兩對角線長相同)，且對角線長

與對角線長

的長度比需介於0.5到1之間。針對反射陣列10上的各菱形金屬貼片的大小(對應到反射單元350的大小)，可依據預期的天線輻射場型涵蓋區域大小來加以決定。此外，透過改變反射陣列10上不同位置的反射單元350大小來調整反射陣列10上不同位置的電磁波反射特性，使得整體的反射電磁波能在特定方向或區域產生輻射能量聚焦的效果。 FIG. 12A is a schematic diagram illustrating a diamond structure according to an embodiment of the present invention. Please refer to FIG. 12A, the part of the reflection unit 350 is shown as a (solid) rhombus structure. Like the five-layer stack design of the reflective array 10, the reflective unit 350 is also in a five-layer structure. The five-layer structure includes dielectric substrates 403 and 404, insulating plates 405 and 406, and reflective metal plates 402. The reflective unit 350 on the dielectric substrate 403, 404 includes etched diamond-shaped metal patches 400, 401. to make sure

The radiation field characteristics of antennas with two different polarizations tend to be the same. The diagonal length of the diamond-shaped metal patch 400,401 has the following limitations:

with

(That is, the two diagonals are the same length), and the diagonals are long

And diagonally long

The length ratio needs to be between 0.5 and 1. The size of each diamond-shaped metal patch on the reflective array 10 (corresponding to the size of the reflective unit 350) can be determined according to the size of the area covered by the expected antenna radiation pattern. In addition, by changing the size of the reflecting unit 350 at different positions on the reflecting array 10, the electromagnetic wave reflection characteristics at different positions on the reflecting array 10 can be adjusted, so that the overall reflected electromagnetic wave can produce a radiant energy focusing effect in a specific direction or area.

It is worth noting that the design of the reflector array antenna 50 is to change the size, shape, and arrangement rules of the reflector unit 350 on the reflector array 10, so that the overall reflectance of the reflector array 3 is the same as that of the dish antenna, thereby achieving high antenna gain. The antenna field type. Therefore, by appropriately adjusting the distribution and/or arrangement of the reflecting units 350 in the reflecting unit arrays 305 to 306, different types of antenna field patterns or beam shaping effects can also be produced, which is suitable for indoor "band-shaped" coverage. .

Fig. 12B is a graph showing the relationship between the reflection phase and the cell size of Fig. 12A. Please refer to FIG. 12B. Whether it is the size of the diamond-shaped metal patch 401, the ratio of the diamond-shaped metal patches 400 and 401, or the selection of the material or thickness of the insulating plates 405 and 406, it will affect the curve change in the figure. In terms of design, the curve in the figure covers as much as possible from 0 degrees to 360 degrees (or close to the aforementioned range), so that the phase distribution of each reflection unit 350 is wider, and a better beam shaping effect is obtained. However, depending on different design requirements, the scope of coverage may still change.

和

(即，各自兩對角線長相同)，且對角線長

與對角線長

的長度比需介於0.5到1之間。此外，反射陣列10上的各環狀菱形金屬貼片的大小(對應到反射單元350a的大小)亦可依據預期的天線輻射場型涵蓋區域大小來加以決定。 FIG. 13A is a schematic diagram illustrating a diamond structure according to an embodiment of the present invention. Please refer to FIG. 13A, a part of the reflection unit 350a is shown as a (ring-shaped) diamond structure. Like the five-layer stack design of the reflective array 10, the reflective unit 350a is also in the five-layer structure. The five-layer structure includes dielectric substrates 503 and 504, insulating plates 505 and 406, and reflective metal plates 502. The reflective unit 505 on the dielectric substrate 503, 504 includes etched ring-shaped diamond-shaped metal patches 500, 501. Similarly, the diagonal length of the ring-shaped diamond-shaped metal patch 500,501 has the following restrictions:

with

(That is, the two diagonals are the same length), and the diagonals are long

And diagonally long

The length ratio needs to be between 0.5 and 1. In addition, the size of each ring-shaped diamond-shaped metal patch on the reflective array 10 (corresponding to the size of the reflective unit 350a) can also be determined according to the size of the area covered by the expected antenna radiation pattern.

FIG. 13B is a diagram showing the relationship between the reflection phase and the cell size of FIG. 13A. Please refer to FIG. 13B. In terms of design, the curve in the figure should also cover 0 degrees to 360 degrees (or close to the aforementioned range) as much as possible to obtain a better beam shaping effect. However, depending on different design requirements, the scope of coverage may still change.

It should be noted that there are other changes in the shape and size of the reflecting unit, which are determined according to actual signal coverage requirements.

為單位（

）而縱軸則是以

為單位（

）。在一實施例中，天線輻射涵蓋區域則是以方位角

為中心點來加以設計。 Fig. 14A is a contour map of normalized antenna gain simulating -45 degree polarization, and Fig. 14B is a contour map of normalized antenna gain simulating +45 degree polarization. Please refer to Figure 14A and Figure 14B, the horizontal axis is

As the unit (

) And the vertical axis is

As the unit (

). In one embodiment, the antenna radiation coverage area is based on the azimuth angle

Design as the center point.

時之二維水平方向天線場型圖。圖15A為

度極化的天線場型圖，而圖15B則為+45度極化的天線場型圖。天線場型圖呈現設定的角度內確實有較強的輻射能量。 Fig. 15A is an antenna field pattern simulating -45 degree polarization, and Fig. 15B is an antenna field pattern simulating +45 degree polarization. Please refer to Figure 15A and Figure 15B, which are hypothetical

Time two-dimensional horizontal antenna field pattern. Figure 15A is

The antenna field pattern of degree polarization, and Fig. 15B is the antenna field pattern of +45 degree polarization. The antenna field pattern shows that there is indeed strong radiated energy within the set angle.

In summary, the reflect array antenna according to the embodiment of the present invention uses beam shaping technology to perform field pattern synthesis for indoor regional signal coverage. The structure of the reflective array antenna includes a dual-polarized feed antenna and a reflective phase distribution array (ie, an antenna array). The feed antenna is used for transmitting and receiving electromagnetic wave signals. The antenna array is used to reflect the electromagnetic wave signal of the dual-polarized feed antenna. In addition, the embodiment of the present invention further designs the reflective element array to have diamond-shaped metal elements of different sizes to form a unique interlaced lattice arrangement in a bilaterally symmetrical manner, so as to satisfy the radiation characteristics of the multi-input and multi-output antenna. The reflect array structure of the embodiment of the present invention can integrate the indoor ceiling space field, thereby achieving the effect of high integration of indoor multi-cell coverage requirements and environment.

The embodiments of the present invention further include the following features and effects:

The feed antenna adopts a crossed dipole antenna to achieve the design effect of multiple input multiple output (MIMO) antenna. In addition, a pointer structure is introduced to improve the field directivity, and the beam width flatness of the field is improved by changing the energy amplitude taper (Amplitude Taper) of the electromagnetic wave signal on the reflected phase distribution array.

The reflection phase distribution array adopts diamond-shaped metal patches, so that the feed antenna and the reflection array achieve the same polarization operation. In addition, in order to maintain the electrical length of one-half of the wavelength of the operating frequency between the reflection phase distribution units, they are arranged in a staggered manner to suppress the side lobes of the composite field.

The reflective array can be deployed in the indoor ceiling field. The size of the overall structure is easy to integrate the ceiling light steel frame space, and only the installation position of the feed antenna needs to be considered, which can greatly simplify the deployment process.

In response to the needs of indoor network capacity expansion, light steel frame partitions can be replaced with reflective array substrates at specific ceiling positions to achieve perfect indoor coverage requirements and high integration of the environment.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

、

、

、

:距離

、

:修正值

、

、

:反射相位 400、401、500、501:菱形金屬貼片

~

、

~

:對角線長50: reflect array antenna 3: feed antenna 10: reflect array 2: ceiling 11: calcium silicate board or plastic PVC board 12: light steel frame 4, 5, 300, 302, 403, 404, 503, 504: dielectric substrate 6, 7, 301, 303, 405, 406, 505, 506: Insulating plate 8, 304, 402, 502: Reflective metal plate 1: Wall 9: Electromagnetic wave 13: Classroom 100, 101: Pointer substrate 102: Radiator 103 : Support column 105: Balun circuit 106: Metal base 200: Inclination adjustment seat 201: Upper part 202: Lower part 203: Rotation scale 204: Rotation axis 205: Main beam direction 305, 306: Reflecting unit array 350, 350a : Reflecting unit 307: Circle 308: Virtual grid 309, 310: Lead straight line 311: Horizontal line WF1, WF2: Radiation wavefront

,

,

,

:distance

,

: Correction value

,

,

: Reflection phase 400, 401, 500, 501: diamond-shaped metal patch

~

,

~

: Diagonal length

FIG. 1 is a schematic diagram of installing a reflective array antenna in an indoor space according to an embodiment of the present invention. FIG. 2 is a schematic diagram of installing a reflector array on a ceiling according to an embodiment of the present invention. Fig. 3 is a schematic diagram of a reflective array antenna installed in a classroom according to an embodiment of the present invention. Fig. 4 is a perspective view of a feed antenna according to an embodiment of the invention. Fig. 5 is a side view of a feed antenna according to an embodiment of the present invention. Fig. 6 is a schematic diagram of an inclination adjusting seat combined with a main body according to an embodiment of the present invention. Fig. 7 is a schematic diagram illustrating the adjustment of the inclination angle of the reclining seat according to an embodiment of the present invention. Fig. 8 is an exploded view of a reflect array according to an embodiment of the present invention. Fig. 9 is a front view of a reflect array according to an embodiment of the present invention. FIG. 10 is a schematic diagram of a lattice structure according to an embodiment of the invention. FIG. 11 is a schematic diagram illustrating the radiation field pattern according to an embodiment of the present invention. FIG. 12A is a schematic diagram illustrating a diamond structure according to an embodiment of the present invention. Fig. 12B is a graph showing the relationship between the reflection phase and the cell size of Fig. 12A. FIG. 13A is a schematic diagram illustrating a diamond structure according to an embodiment of the present invention. FIG. 13B is a diagram showing the relationship between the reflection phase and the cell size of FIG. 13A. Figure 14A is a contour plot of the normalized antenna gain simulated -45 degree polarization. Fig. 14B is a contour map of normalized antenna gain simulating +45 degree polarization. Figure 15A is a simulated -45 degree polarization antenna field pattern diagram. Fig. 15B is a simulated antenna field pattern of +45 degree polarization.

10: reflective array

11: Calcium silicate board or plastic PVC board

12: Light steel frame

Claims (10)

A reflective array antenna, including: A feed antenna, including: A crossed dipole antenna radiator; and A reflection array is used to reflect the electromagnetic waves radiated by the feed antenna, and includes: A first dielectric substrate including a first reflecting unit array, wherein the first reflecting unit array includes a plurality of first reflecting units, and the first reflecting units are arranged according to the radiation field pattern to be formed by the reflecting array; A second dielectric substrate including a second reflecting unit array, wherein the second reflecting unit array includes a plurality of second reflecting units, and the second reflecting units are arranged according to the radiation pattern to be formed by the reflecting array; A first insulating board arranged between the first dielectric substrate and the second dielectric substrate; A reflective metal plate; and A second insulating plate is arranged between the second dielectric substrate and the reflective metal plate, wherein the first dielectric substrate, the first insulating plate, the second dielectric substrate, the second insulating plate and the reflective metal plate Stack in order. The reflect array antenna according to claim 1, wherein each of the first reflection units includes a diamond-shaped first metal patch, and each of the second reflection units includes a diamond-shaped second metal patch, and the first metal The two diagonal lengths of the patch or the second metal patch are the same, the length ratio of the diagonal lengths of the first metal patch and the corresponding second metal patch is between 0.5 and 1, and the Diamond shapes include solid and ring-shaped diamonds. The reflect array antenna according to claim 2, wherein the first reflectors are symmetrical in the first reflector array, and the second reflectors are symmetrical in the second reflector array. The reflect array antenna according to claim 2, wherein the sizes of the first reflection units and the second reflection units are determined according to the coverage range of the radiation pattern. The reflective array antenna according to claim 2, wherein the first reflection units are arranged on the first dielectric substrate according to a lattice structure, and the second reflection units are arranged on the second dielectric substrate according to the lattice structure Arranged, and the lattice structure is related to the radiation field type. The reflect array antenna according to claim 5, wherein the lattice structure includes a virtual grid, the virtual grid includes a plurality of parallel vertical lines and a plurality of parallel horizontal lines, the vertical lines include arranged in order A plurality of odd-order plumb lines and a plurality of even-order plumb lines, and the first reflecting units or the second reflecting units are arranged at the intersections of the odd-order plumb lines and the horizontal lines or at the even-numbered plumb lines At the intersection of the secondary plumb line and the horizontal lines. The reflective array antenna according to claim 1, wherein the overall outline of the reflective metal plate, the first reflective element array, and the overall outline of the second reflective element array are approximately the same geometric figures. The reflective array antenna according to claim 1, wherein the reflective array is used to be installed on a ceiling, wherein the reflective metal plate is closest to the ceiling, and the first dielectric substrate is farthest from the ceiling. The reflect array antenna according to claim 1, wherein the feed antenna further includes: A plurality of director substrates are respectively arranged in parallel with the radiator and are separated from the radiator at different distances, wherein each of the director substrates is provided with a pointer; and Two Balun circuits are arranged crosswise and used to transmit signals to the radiator and the directors. The reflect array antenna according to claim 9, wherein the feed antenna further includes: A metal base; A plurality of supporting posts are used to connect the radiator and the director substrates, and are vertically arranged on the metal base; and An inclination adjusting seat is arranged on the metal base and used to adjust the inclination of the feed antenna.

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