TWM583134U - Toroidal compact antenna test range - Google Patents

Abstract

Toroidal CATR (Compact Antenna Test Range) consists of torus as main reflector, one or many sub-reflectors, and one or many feed antennas. The concave of torus points toward the rotation axis of torus. If various directions of incident plane waves to the rotation axis of quiet zone which is the rotation axis of torus are required, the geometry of each sub-reflector can be calculated by Fermat's principle and Snell's law with given relate part area of torus and relate feed location. This invent describes the method to generate various directions of incident plane wave at the quiet zone of antenna test range. By using this toroidal CATR, two dimensional and three dimensional antenna radiation patterns with one or many antennas can be measured simultaneously.

Description

Ring-shaped telescopic antenna test device

The invention relates to a device for generating a plurality of sets of different plane incident plane waves into the test static zone by using a ring-shaped reflecting surface, combining different sets of auxiliary reflecting surfaces, and a plurality of sets of signal feeding devices, for simultaneously measuring the position of the antennas at different positions. A device for measuring the Radiation pattern.

At present, when measuring the radiation pattern of the antenna, the antenna should be placed in a region where an ideal incident plane wave (Plane wave) can be received, and the ideal plane wave is the same as the wavefront electric field (Amplitude) amplitude (Amplitude). The area of the wavefront where the phase of the electric field is the same. The area under this condition is called the Quiet zone. In order to achieve the ideal plane wave, the distance between the antenna to be tested and the source of the antenna needs to be infinity and the process of radio wave propagation does not have multiple reflections, refraction, or diffraction, so the plane wave depends on the specification requirements. Wavefront's electric field amplitude (Amplitude), and the wavefront's electric field phase (Phase) size, allows for a slight relaxation, such as the traditional far-field microwave darkroom test quiet zone specifications (such as test dead zone) The size is D, λ is the wavelength, and the measurement of the distance R is 2D ² /λ, the electric field quadratic phase difference of the wavefront is 22.5 degrees, plus the influence of electric wave multipath reflection or diffraction, etc., which is the fluctuation of the electric field amplitude ±1 Decibel, the electric field phase ripple is ±6 degrees. If the wavelength is shorter (the higher the frequency), in order to maintain the same test dead zone size D, the measurement distance R needs to be increased. In contrast, the space of the microwave darkroom also needs to be enlarged.

In order to have a large test dead zone in a limited space, and the test dead zone size is not affected by the frequency, the existing antenna field type measuring device is mainly a CATR (Compact Antenna Test Range). The device is implemented, and the existing telescopic antenna measuring device can be mainly divided into two types, a telescopic antenna measuring field of a single reflecting surface, and a telescopic antenna measuring field of a double reflecting surface. The telescopic antenna measuring field of the single reflecting surface is composed of the eccentric part of the paraboloid as the main reflecting surface, and the feeding source is placed at the focus of the paraboloid. After the spherical wave of the feeding radiation is parabolically reflected, the plane wave can be obtained. If the antenna power efficiency (Antenna power efficiency) is considered, the distance measurement field of the teleconverter antenna is small. The radiation field of the telescopic antenna of the double reflecting surface, the common main reflecting surface is the eccentric part of the paraboloid (Paraboloid) is the main reflecting surface, and the auxiliary reflecting surface geometry is part of the elliptical surface (Ellipsoid) or part of the hyperboloid (Hyperboloid) ), the inner (or outer) focal point of the auxiliary reflecting surface overlaps with the focus of the paraboloid, and the feed is placed outside the (or inner) focus of the auxiliary reflecting surface, and the spherical wave of the feeding radiation is reflected by the auxiliary reflecting surface, The equivalent virtual feed is placed inside the secondary reflective surface (or Outside) the spherical wave of the focal radiation. The spherical wave is reflected by the main reflecting surface as a plane wave. For example, considering the same antenna power efficiency, the test dead zone composed of the double reflecting surface is a test dead zone composed of a single reflecting surface. Big.

In order to make the above two kinds of telescopic antenna measurement field test static zone, the wavefront electric field amplitude and the electric field phase ripple of the plane wave change little, except for the distortion of the surface geometry of the reflection surface, the edge of the reflection surface needs special treatment. The edge treatment of the reflective surface is usually performed by adding a plurality of serrated edge reflective surfaces to the edge, or the edge adopting a rolled edge type, and the more edge treatment of the reflective surface increases the cost and the complexity. In addition, if multiple plane waves are to enter the test dead zone from different directions, for testing multiple antenna radiation field tests at different positions on the test object in the static zone and different directions, multiple sets of telescopic antenna measurement fields are required. According to the arrangement, since the main reflecting surface is a paraboloid, the erection complexity and space are required to be increased.

Therefore, an object of the present invention is to provide an incident plane wave having a plurality of different directions in addition to low complexity and space saving requirements in the static field of the measurement field for different positions and different directions on the carrier. A multi-antenna simultaneous measurement of a ring-shaped pitch antenna test device of each field type.

Therefore, the novel ring-shaped pitch antenna testing device comprises a torus main reflecting surface, at least one geometric shape (or different) in different positions. a surface, and at least one signal feeder relative to the auxiliary reflection surface.

The main reflecting surface is an annular reflecting surface, and any point on the surface is composed of two mutually perpendicular main curvatures, wherein one of the curvatures is a curvature of a first curve of a circular circle, and the radius of curvature of the second curve The position of the curve varies at different heights, but the center of curvature is always in the center of the static test zone, and the center of curvature of the other second curve is in the ring. The shape can be parabola or hyperbola. , ellipse (Ellipse), circular line (Circle), and any curve that can be expressed by formula.

The geometry of the auxiliary reflecting surface is determined by the partial reflection area of the main reflecting surface and the corresponding feeding position. The spherical wave radiated from the feed position is reflected by the auxiliary reflecting surface to the main reflecting surface, and then reflected by the main reflecting surface into a plane wave, and the center position of the dead zone is tested toward the field, and the two waves are performed according to the Fermat principle. The phase difference between the relative positions is equal, and Snell's law, at the position of the reflection point, the incident angle is equal to the reflection angle, and the normal directions of the incident direction, the reflection direction, and the position of the reflection point are coplanar. Therefore, the distance R from the feed position to the reflection point on the auxiliary reflection surface, plus the distance L from the reflection point on the auxiliary reflection surface to the reflection point on the main reflection surface, and the distance M of the plane wave after the reflection of the main reflection surface, According to R + L + M is a fixed constant, and Snell's law, the geometry of the auxiliary reflection surface can be calculated.

Moreover, another object of the present invention is to provide an incident flat with a plurality of different directions in addition to low complexity and space saving requirements in the measurement field test static zone. The surface wave is used to measure the ring-shaped telescopic antenna test device of each field at the same time for multiple antennas in different positions and different directions on the carrier.

Therefore, the novel ring-shaped pitch antenna testing device can generate a plurality of plane waves incident in different directions by using only one set of ring-shaped main reflecting surfaces with at least one auxiliary reflecting surface and at least one corresponding signal feeding device. The quiet zone is used for field type measurement of multiple antennas for receiving or transmitting. The geometry of the auxiliary reflecting surfaces is defined by the surface equation of the main reflecting surface and the positions of the signal feeders.

Preferably, the ring-shaped pitch antenna testing device comprises a set of ring-shaped main reflecting surfaces and at least one auxiliary reflecting surface, wherein the main reflecting surface of the ring-shaped type is composed of two orthogonal curves, wherein one of the curves is circular Curve, the center of the circle is on the central axis of the test zone. Another curve may be one of Parabola, Hypcrbola, Ellipse, Circle, and any curve that can be formulated.

Preferably, the main reflecting surface of the ring type is composed of two main curves, a first curve of which is a circular curve, and the center of the circle is on the central axis of the test dead zone.

A second curve of the main reflecting surface of the ring type may be a parabolic equation.

A second curve of the main reflecting surface of the ring type may be a hyperbolic equation.

A second curve of the main reflecting surface of the ring type may be an elliptical line equation.

A second curve of the main reflecting surface of the ring type may be a curve represented by an equation or the like.

The effect of the novel is that the first curve surrounds the central axis The main reflecting surface, and the defined radiation space, and the auxiliary reflecting surface defined by the surface equation of the main reflecting surface and the position of the signal feeder to be generated in the radiation space The measurement of the direction of travel uses electromagnetic waves, which in turn can measure the at least one antenna to be received at a specific time point to generate corresponding electromagnetic radiation parameters, and at the same time, according to the geometrical characteristics of the main reflection surface, the area to be edge-treated is reduced. Moreover, the size of the test dead zone can be increased, thereby reducing the construction difficulty and manufacturing cost of the reflective surface.

21‧‧‧Antenna

22‧‧‧Receiver analyzer

31‧‧‧Main reflective surface

4‧‧‧Signal Feeder

51‧‧‧Auxiliary reflector

C1‧‧‧ first curve

C2‧‧‧second curve

L1‧‧‧ radius of curvature

L2‧‧‧ central axis

R1‧‧‧radiation space

R2‧‧‧ test quiet zone

S1~S3‧‧‧effective radiation area

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a plan view of an embodiment of the novel annular-recess antenna testing device, and generating a positive direction of the plane wave in the middle direction FIG. 2 is a schematic view showing a ring-shaped main reflecting surface, a plurality of auxiliary reflecting surfaces, and a plurality of feeding positions; FIG. 2 is a schematic view for explaining the setting position of the related elements of the embodiment; FIG. 3 is a partial schematic view (including main reflective surface, auxiliary reflective surface, feed position, and test dead zone, etc.), indicating the position of the relevant components in a radiation space of this embodiment and the direction of travel of the electromagnetic wave; and FIG. 4 illustrates the simulated beamforming direction of the example In the test static zone, multiple beams have plane waves of 0 degrees, 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, 315 degrees, etc. In this example, the plane wave amplitude of each beam in the static zone is tested. Dimensional change The amplitude is ±0.65 decibels.

Referring to FIG. 1, FIG. 2 and FIG. 3, an embodiment of the present invention relates to a Toroidal compact antenna test range for measuring a plurality of antennas 21 to receive planar electromagnetic waves in a test dead zone R2 (Plane) Antenna radiation pattern parameter after electromagnetic wave, comprising a Torus main reflector 31, at least one signal horn 4, and at least one auxiliary reflection surface (Sub-reflector) 51.

It should be noted that the number of the signal feeder 4 and the auxiliary reflection surface 5 of the embodiment may be multiple, and each of the signal feeders 4 is disposed at a different position, and the geometry of each auxiliary reflection surface 51 may be The same or different, in the present embodiment, the description of the signal feeder 4 and the auxiliary reflection surface 5 is plural.

Any point on the annular main reflecting surface 31 is composed of a first curve C1 which is a circular curve and a second curve C2 which is orthogonal to the first curve C1, and the second curve C2 is a circle a curve, a parabola curve, an elliptic curve, a hyperbola, and any curve that can be expressed by the formula. One of the curvatures L1 of the first curve C1 changes with the height position of the second curve C2, but the center of curvature L1 of the first curve C1 is always On the center axis L2 of the test dead zone. Therefore, the first curve C1 and the second curve C2 constitute the main reflection surface It is the main reflection surface of the ring.

It is further explained that the substantial appearance of the main reflective surface 31 is annularly surrounded and the surface is curved, and the space surrounded by the main reflective surface 31 in an annular form is the defined radiation space R1, and the The trajectory of the two-curve C2 satisfies the parabolic equation, the elliptic equation, the hyperbolic equation, the circular equation, or the curve represented by the equation, etc., when the main reflective surface 31 is actually designed and manufactured, due to the symmetry of the casing in the first curve C1 Continuity, there is no edge diffraction problem, and the magnitude of the electric field amplitude at the edge of the second curve C2 can be determined by the signal feeder field type and the auxiliary reflection surface, so the edge diffraction processing is relatively simple, so that in addition to the simple construction, the main The reflective surface 31 will also have a larger test dead zone size. More specifically, any point on the surface of the main reflecting surface is composed of two mutually perpendicular main curves, one of which is a circular line whose center of curvature is at the center of the axis of the test dead zone, and the other The orthogonal curve can be a parabola, a hyperbola, an ellipse, a circle, and any curve that can be formulated.

In addition, the measured antennas 21 are placed in a Quiet zone R2 of the radiation space R1, and the test dead zone R2, in this case, the amplitude of the plane electromagnetic wave in the region is changed to 1.3 decibels, ie amplitude chopping between -0.65 decibels to 0.65 decibels, and phase angle chopping between -5° and 5°.

The signal feeder 4 is located in the radiation space R1 and radiates a plurality of feed signals related to the plane wave, wherein each of the S1~S3 is radiated by each signal feeder 4 The effective radiation area of the feed signal.

The surface equations of the auxiliary reflecting surfaces 51 are defined by the surface equation of the main reflecting surface 31 and the position of the signal feeder 4, and the signal feeders 4 inject the feedings toward the auxiliary reflecting surfaces 51. When the spherical wave signal is transmitted, the auxiliary reflecting surface 51 reflects the feeding spherical wave signal to the main reflecting surface 31, and then reflects the plane electromagnetic wave traveling toward the central axis L2 through the first reflecting surface 31 for supplying The measured antennas 21 are received to generate corresponding field type parameters, and the receiving analyzer 22 measures the relevant data.

It should be noted that the surface geometry of the auxiliary reflecting surfaces 51 is determined by the surface equation of the first reflecting surface 31 and the position of the signal feeders 4 by geometric tracing.

In addition, the present invention can also use the ring-shaped main reflecting surface, with the same (or different) auxiliary reflecting surface and signal feeder, to achieve plane waves with different directions in the test static zone.

Furthermore, the present invention can also use a ring-shaped main reflecting surface, a signal feeding device mechanically moving along a fixed trajectory and its corresponding auxiliary reflecting surface, to achieve a plane wave having a relative direction in the test dead zone, and supporting the antenna to be tested. The two-dimensional rotating table can simultaneously test the three-dimensional radiation pattern of the antenna of the multi-antenna system.

As described above, the embodiment of the present invention, in addition to rapidly testing the antenna two-dimensional field type of the multi-antenna system, such as supporting the antenna to be tested The turntable can also quickly test the three-dimensional field of the antenna of a multi-antenna system.

Referring to FIG. 4, in the actual simulation, beamforming is performed in different directions (45°, 90°, 135°, 180°, 215°, 270°, 315°, 360°) toward L2. From this result, it can be seen that in the present embodiment, a plane incident wave can be formed in each direction of L2 and received by the antenna to be tested.

In summary, the novel ring-shaped antenna test device reduces the area to be edge-treated by the geometrical characteristics of the main reflective surface of the annular appearance, thereby increasing the size of the test dead zone and thus reducing the difficulty of construction of the reflective surface. And manufacturing costs. Therefore, the creative purpose of the present invention is indeed achieved. On the other hand, also due to the main reflection surface, the first curve trajectory is a circular equation, and the circular second trajectory of the ring can be a parabolic equation, an elliptical equation, a hyperbolic equation, and a circular equation, or a curve represented by an equation. Etc., the geometry of the auxiliary reflecting surface is determined by the area of the main reflecting surface and the position of the signal feeder. For example, the positions of the plurality of signal feeders are arranged in a circular shape, and the relative positions of the main reflecting surfaces of the ring are defined. The relative auxiliary reflecting surface geometry will have plane waves incident in different directions on the central axis of the test dead zone, and further, according to the simulation result obtained by the actual parameters, fully verify the multi-antenna measurement in the novel telescopic antenna. The devices can each receive planar electromagnetic waves from different directions for one or more antennas to simultaneously measure the radiation pattern of the two-dimensional antenna.

However, the above is only the preferred embodiment of the present invention, when not Therefore, the scope of the novel implementation is limited, that is, the simple equivalent changes and modifications made by the present invention in the scope of the patent application and the contents of the patent specification are still within the scope of the novel patent.

Claims (7)

A ring-shaped pitch antenna testing device can use only one set of ring-shaped main reflecting surfaces to cooperate with at least one auxiliary reflecting surface and at least one corresponding signal feeder to generate a plurality of plane waves incident in different directions in the test dead zone For field type measurement for receiving or transmitting by a plurality of antennas, the geometry of the auxiliary reflecting surfaces is defined by the surface equation of the main reflecting surface and the positions of the signal feeders. The ring-shaped pitch antenna testing device according to claim 1, comprising a ring-shaped main reflecting surface and at least one auxiliary reflecting surface, wherein the main reflecting surface of the ring-shaped type is composed of two orthogonal curves, one of which is a curve For a circular curve, the center of the circle is on the central axis of the test zone, and the other curve can be parabola, hyperbola, ellipse, circle, and any curve that can be expressed. Wait for one of them. The ring-shaped pitch antenna testing device according to claim 1, wherein the main reflecting surface of the ring type is composed of two main curves, a first curve of which is a circular curve, and a center of the circle is on the central axis of the test dead zone. The ring-shaped pitch antenna testing device of claim 3, wherein a second curve of the main reflecting surface of the ring type is a parabolic equation. The ring-shaped pitch antenna testing device of claim 3, wherein a second curve of the main reflecting surface of the ring type is a hyperbolic equation. The ring-shaped pitch antenna testing device of claim 3, wherein a second curve of the main reflecting surface of the ring type is an elliptical line equation. The ring-shaped pitch antenna testing device according to claim 3, wherein a second curve of the main reflecting surface of the ring type is a curve represented by an equation or the like.