CN220474892U - Circularly polarized microwave detecting antenna - Google Patents

Abstract

The utility model provides a circularly polarized microwave probe antenna comprising a circularly polarized radiation source and a reference ground, wherein the circularly polarized radiation source is spaced from the reference ground, wherein the circularly polarized radiation source is provided with a regular polygon or a circular basic form and comprises at least one degenerate mode separating unit formed in a hollowed or epitaxial manner from the basic form, wherein the area of each degenerate mode separating unit is equally divided by a straight line passing through the physical center point of the basic form, the straight line is correspondingly named as an area bisector, wherein when the physical center point of the degenerate mode separating unit is coincident with the physical center point of the basic form, the degenerate mode separating unit is simultaneously symmetrical with the area bisector, wherein the circularly polarized radiation source is provided with a feed point, and the included angle between the connecting line of the feed point and the physical center point of the basic form and the area bisector is more than or less than 45 degrees, so as to form a better circularly polarized characteristic.

Description

Circularly polarized microwave detecting antenna

Technical Field

The utility model relates to the field of microwave detection, in particular to a circularly polarized microwave detection antenna.

Background

Antennas are used as necessary devices for wireless communication technology and are widely used in production, living and military applications, such as satellite communication systems, satellite navigation systems, remote control systems, and common wireless devices such as RFID, WIFI, bluetooth, etc., which have index characteristics such as radiation directivity, polarization, etc. for transmitting and/or receiving electromagnetic waves. Specifically, the polarization of an antenna is a parameter of vector space pointing of an electromagnetic field radiated by the antenna, generally, the change direction of an electric field is taken as the polarization direction of the antenna, and according to the difference of the change directions of the electric field, the polarization of the antenna can be divided into: linear polarization and circular polarization (including elliptical polarization), wherein a linear polarized electromagnetic wave generated by a linear polarized antenna refers to an electromagnetic wave that propagates forward by vibrating back and forth in one direction, and a circular polarized or elliptical polarized electromagnetic wave refers to an electromagnetic wave that propagates forward by rotating along a circular or elliptical path about the propagation direction.

In the field of microwave detection, the microwave detector is required to form a detection area which tends to be circular in most application scenes, so that the microwave detector adopting the circularly polarized antenna can theoretically form the detection area which tends to be circular based on the electromagnetic wave propagation characteristics of the circularly polarized antenna. The circular polarized antenna generally adopts a mode of setting degeneracy or a multi-point feed structure to form circular polarization, referring specifically to fig. 1A, a circular polarized antenna 10P set with a degenerate mode separation unit 11P is illustrated, wherein the circular polarized antenna 10P includes a radiation source 12P, the radiation source 12P is circularly polarized with a single feed point structure and has a feed point 13P and at least one degenerate mode separation unit 11P, wherein a connection line between the feed point 13P and a physical center point 120P of the radiation source 12P is perpendicular to two opposite sides of the radiation source 12P and forms an angle of 45 ° with the degenerate mode separation unit 11P and the physical center point 120P, but when the actual feed setting is completed, the impedance matching setting and the forming circular polarization setting can generate conflict, that is, when the impedance matching is completed, the pure circular polarization can not be formed, referring specifically to fig. 1B and fig. 1C, when the circular polarized antenna 10P is fed with the feed point 13P, a difference between total gain and left-hand gain and a formed radiation range are perpendicular to two opposite sides of the radiation source 12P, and the total gain is known to be the circular polarization 1dB, and the total gain is not to be the circular polarization 10 dB, and the total gain is not known to be the circular polarization 10 dB, and the total gain is not the circular polarization is the circular polarization 1dB 1, and the total gain is not the circular polarization is the full, and the gain is the full.

In practical applications, the radiation range of the circularly polarized antenna 10P is further affected by factors such as installation environment, due to the poor circular polarization characteristics of the circularly polarized antenna 10P. Taking the use scenario of the lamp as an example, referring to fig. 1D, when the circularly polarized antenna 10P is mounted on the lamp, the large-area metal such as the housing and the lamp panel of the lamp is equivalent to the reference ground of the circularly polarized antenna 10P, so that the beam of the circularly polarized antenna 10P is changed, and further the problem of non-circular radiation range is aggravated, and referring specifically to fig. 1E and 1F, the radiation range formed by mounting the circularly polarized antenna 10P on the lamp is visualized, wherein the radiation range of the circularly polarized antenna 10P is difficult to match with the desired detection range tending to be circular, and meanwhile, as can be seen by comparing fig. 1E and 1F, the left-hand gain is also significantly smaller than the total gain when the circularly polarized antenna 10P is mounted in the lamp, and the circularly polarized antenna 10P has poor circular polarization characteristics.

Even if the radiation source of the circular polarized antenna 10P is changed to a circular radiation source 12P with a more uniform shape, as shown in fig. 1G, when the corresponding feeding and impedance matching requirements are satisfied, the energy of the probe beam formed by the circular polarized antenna 10P is difficult to be balanced in the 360 ° direction, and as can be seen from comparing fig. 1H and 1I, the total gain of the circular polarized antenna 10P corresponding to fig. 1H exceeds 5dB, the left-hand gain of the circular polarized antenna 10P corresponding to fig. 1I is only 3.1dB, the left-hand gain is significantly smaller than the total gain, and the radiation range formed by the circular polarized antenna 10P is non-circular, i.e. the circular polarization characteristic of the circular polarized antenna 10P is poor.

That is, in theory, the circularly polarized antenna is more capable of meeting the use requirement of forming the detection area which tends to be circular, but in practice, is blocked from being influenced by factors such as matching requirement and installation environment, the circularly polarized characteristic of the circularly polarized antenna is poor, so that the formed actual radiation range is difficult to match with the expected detection area which tends to be circular.

Disclosure of Invention

An object of the present utility model is to provide a circularly polarized microwave probe antenna, in which the circularly polarized performance of the circularly polarized microwave probe antenna is improved, and a better circularly polarized characteristic can be formed, which is beneficial to exerting the theoretical advantages of circular polarization, and simultaneously, is beneficial to improving the adaptability of the circularly polarized microwave probe antenna to different environments, and is beneficial to corresponding impedance matching design.

It is another object of the present utility model to provide a circularly polarized microwave probe antenna, wherein the circularly polarized microwave probe antenna comprises a circularly polarized radiation source and a reference ground, wherein the circularly polarized radiation source is spaced apart from the reference ground, wherein the circularly polarized radiation source is arranged from a regular polygon or a circular basic form and comprises at least one degenerate mode separation element formed hollowed out or epitaxially from the basic form, wherein the area of each degenerate mode separation element is divided by a straight line passing through a physical center point of the basic form, the straight line being correspondingly named an area bisector, wherein the degenerate mode separation element is simultaneously symmetrical with the area bisector when the physical center point of the degenerate mode separation element coincides with the physical center point of the basic form, wherein the circularly polarized radiation source has a feed point, wherein the circularly polarized radiation source is not arranged with a line symmetry of the feed point and the physical center point of the basic form to form a circular polarization to the circularly polarized radiation source, and the line of the feed point and the physical center point of the basic form is connected with the circularly polarized radiation source so as to increase the circularly polarized radiation beam toward the circularly polarized microwave probe antenna in a direction more than 45 °.

Another object of the present utility model is to provide a circularly polarized microwave probe antenna, wherein in a state in which the circularly polarized radiation is disposed from a basic form of a square, the square has two pairs of center lines passing through physical center points thereof and being perpendicular to each other, wherein one pair of center lines is two first center lines perpendicular to two opposite sides of the square, wherein the other pair of center lines is two second center lines connecting two opposite corners of the square, wherein the area bisector is preferably located at the first center line or the second center line, wherein the feeding point is disposed in a state offset from both the first center lines and the second center lines to form a structural form in which the circularly polarized radiation source is not symmetrical with a line connecting the feeding point and the physical center point of the basic form and an angle between the feeding point and the area bisector is greater than or less than 45 °, so that the circularly polarized microwave probe antenna can form a preferable circularly polarized characteristic when the circularly polarized radiation is fed from the feeding point.

It is another object of the present utility model to provide a circularly polarized microwave probe antenna, wherein the circularly polarized radiation originates from a square basic form, and is circularly polarized by cutting two opposite corners of the square to form the degenerate mode separating element, wherein the circularly polarized radiation source is divided into four areas by two first central lines, and the circularly polarized radiation source has two corner cutting areas with a corner cutting design and two non-corner cutting areas adjacent to the two corner cutting areas respectively, wherein the feeding point is preferably arranged in the non-corner cutting areas, so as to further facilitate the circularly polarized microwave probe antenna to form better circular polarization characteristics.

Another object of the present utility model is to provide a circularly polarized microwave probe antenna, wherein the circularly polarized radiation source adopts a microstrip feed structure, and the circularly polarized microwave probe antenna includes a strip transmission line, wherein one end of the strip transmission line is connected to the circularly polarized radiation source, and the other end of the strip transmission line is connected to a corresponding feed circuit, and the corresponding feed point is equivalently located at a point where the strip transmission line is connected to the circularly polarized radiation source, and at least one side of the strip transmission line is provided with at least one grounding point, so as to facilitate reducing radiation of the strip transmission line, thereby improving signal transmission quality of the strip transmission line.

Another object of the present utility model is to provide a circularly polarized microwave probe antenna, wherein the circularly polarized radiation source is disposed at the feeding point to emit at least one circularly polarized probe beam in a circularly polarized manner when the feeding point is fed with a corresponding excitation signal, and receives a reflected echo formed by the circularly polarized beam being reflected by a corresponding object, and is integrally disposed to receive and transmit, thereby being advantageous to reduce the size of the circularly polarized microwave probe antenna.

Another object of the present utility model is to provide a circularly polarized microwave probe antenna, wherein the circular polarization characteristic of the circularly polarized microwave probe antenna is improved, and the energy of the probe beam formed by the circularly polarized microwave probe antenna alternately advances with the characteristic of circular polarization, so that the energy in the 360 ° direction is balanced, and the adaptability of the circularly polarized microwave probe antenna to different environments is improved.

According to one aspect of the present utility model, there is provided a circularly polarized microwave probe antenna, wherein the circularly polarized microwave probe antenna comprises:

a reference ground; and

a circularly polarized radiation source, wherein the circularly polarized radiation source is spaced from the reference ground, wherein the circularly polarized radiation source is derived from a regular polygon or a circular basic form and comprises at least one degenerate mode separation element formed hollowed out or epitaxially from the basic form, wherein the area of each degenerate mode separation element is equally divided by a line passing through the physical center point of the basic form, correspondingly named the line being an area bisector, wherein the degenerate mode separation element is simultaneously symmetrical with the area bisector when the physical center point of the degenerate mode separation element coincides with the physical center point of the basic form, wherein the circularly polarized radiation source has a feed point, wherein the circularly polarized radiation source is not arranged with circular polarization to the circularly polarized radiation source with a line connecting the feed point and the physical center point of the basic form, and the line connecting the feed point and the physical center point of the basic form is at an angle of more than or less than 45 ° to the area bisector.

In an embodiment, the circularly polarized radiation is configured from a basic configuration of a square, the square having two pairs of centerlines passing through its physical center point and being perpendicular to each other, wherein one pair of centerlines is two first centerlines perpendicular to two opposite sides of the square, wherein the other pair of centerlines is two second centerlines connecting two opposite corners of the square, wherein the area bisector is located at the first centerline or the second centerline, wherein the feeding point is configured in a state offset from both the first centerlines and the second centerlines, to form a structural configuration in which the circularly polarized radiation source is not symmetrical with a line connecting the feeding point and the physical center point of the basic configuration and an angle between the line connecting the feeding point and the physical center point of the basic configuration and the area bisector is greater than or less than 45 °.

In an embodiment wherein the circularly polarized radiation originates from a basic form of a square, the circularly polarized radiation source is arranged circularly polarized by cutting out two opposite corners of the square to form the degenerate mode separating element, such that when the circularly polarized radiation originates from the feeding point being fed, the circularly polarized radiation source is capable of generating two degenerate modes with orthogonal polarizations, wherein the degenerate mode separating element is arranged to separate the resonant frequencies of the two degenerate modes with orthogonal polarizations to form a phase difference between the two degenerate modes with orthogonal polarizations tending to 90 °, thus forming the circularly polarized arrangement of the circularly polarized radiation source.

In an embodiment, the circularly polarized radiation source is divided into four areas by two first central lines correspondingly, and then the corresponding circularly polarized radiation source is provided with two corner cut areas designed by corner cut and two non-corner cut areas respectively adjacent to the two corner cut areas, wherein the feeding point is arranged in the non-corner cut areas.

In an embodiment, wherein the circularly polarized radiation source is arranged with a probe feed structure.

In an embodiment, wherein the circularly polarized microwave probe antenna comprises a strip transmission line, wherein the strip transmission line feed is connected between the feed point and the respective feed circuit.

In an embodiment, two symmetrical grounding points are disposed on two sides of the strip transmission line, and the grounding points are electrically connected to the reference ground.

In an embodiment, the circularly polarized radiation source is configured with a microstrip feed structure, one end of the strip transmission line is connected to the circularly polarized radiation source, and the other end of the strip transmission line is connected to a corresponding feed circuit, so that the corresponding feed point is equivalently located at a point where the strip transmission line is connected to the circularly polarized radiation source.

In one embodiment, the strip transmission line includes a main transmission line and two feeder lines led out from one end of the main transmission line, the other end of the main transmission line is connected to a corresponding feeder circuit, and the corresponding feeder point is equivalently located at one end of the main transmission line connected to the two feeder lines.

In an embodiment, the circularly polarized radiation source is arranged with an edge feed structure, corresponding to the circularly polarized radiation source being connected to the corresponding excitation signal via an edge feed, wherein the edge feed is a strip conductor adjacent and parallel to the straight edge of the circularly polarized radiation source, wherein one end of the strip transmission line is connected to the edge feed, and the other end of the strip transmission line is connected to the corresponding feed circuit, wherein the feed point is electrically equivalent to the point at which the edge feed is connected to the strip transmission line.

In an embodiment, the circularly polarized microwave probe antenna comprises a circuit substrate, wherein the circularly polarized radiation source and the reference ground are disposed on two sides of the circuit substrate, wherein the circuit substrate is disposed in a rectangular shape, and the circularly polarized radiation source is disposed in a state close to two connected sides of the circuit substrate.

In an embodiment wherein the circularly polarized radiation source is arranged in a circular basic configuration and symmetrical about the area bisector.

In an embodiment, wherein the circularly polarized radiation originates from a physical center point thereof which is grounded.

In an embodiment, wherein the circularly polarized radiation sources are in at least one group and/or at least one pair of states equidistant from their physical center points, the grounding points arranged equiangularly about their physical center points equivalently form a state in which the physical center points of the circularly polarized radiation sources are grounded.

Further objects and advantages of the present utility model will become fully apparent from the following description and the accompanying drawings.

Drawings

Fig. 1A is a schematic structural diagram of a conventional circularly polarized antenna.

Fig. 1B is a radiation pattern of the circularly polarized antenna.

Fig. 1C is a left-hand radiation pattern of the circularly polarized antenna.

Fig. 1D is a schematic diagram of a simulation structure in which the circularly polarized antenna is mounted on a lamp housing.

Fig. 1E is a radiation pattern of the structure according to fig. 1D.

Fig. 1F is a left-handed radiation pattern of the structure according to fig. 1D.

Fig. 1G is a schematic structural view of the circularly polarized antenna configured in a circular radiation source configuration.

Fig. 1H is a radiation pattern in the configuration of fig. 1G.

FIG. 1I is a left-handed radiation pattern of the structure according to FIG. 1G.

Fig. 2A is a schematic structural diagram of a circularly polarized microwave probe antenna according to an embodiment of the utility model.

Fig. 2B is a schematic front view of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 2C is a radiation pattern of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 2D is a left-hand radiation pattern of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 3A is a schematic diagram of a simulation structure of the circularly polarized microwave probe antenna according to the above embodiment of the utility model mounted on a lamp housing.

Fig. 3B is a radiation pattern of a simulation structure in which the circularly polarized microwave probe antenna is mounted on a lamp housing according to the above embodiment of the utility model.

Fig. 3C is a left-hand radiation pattern of a simulation structure in which the circularly polarized microwave probe antenna is mounted on a lamp housing according to the above embodiment of the utility model.

Fig. 4 is a schematic diagram of a variation of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 5 is a schematic diagram of a variation of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 6 is a schematic diagram of a variation of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 7 is a schematic diagram of a modification of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 8 is a schematic diagram of a variation of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 9 is a schematic diagram of a product form of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 10 is a schematic diagram of a product form of the circularly polarized microwave probe antenna according to the above embodiment of the utility model.

Fig. 11A is a schematic diagram of a variation of the circularly polarized microwave probe antenna according to the embodiment of the utility model.

Fig. 11B is a radiation pattern according to the structure of fig. 11A.

Fig. 11C is a left-handed radiation pattern according to the structure of fig. 11A.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

Referring to fig. 2A to 11A of drawings of the specification of the present utility model, a circularly polarized microwave probe antenna 10 according to an embodiment of the present utility model is illustrated, wherein the circularly polarized microwave probe antenna 10 includes a circularly polarized radiation source 11 and a reference ground 12, wherein the circularly polarized radiation source 11 is spaced apart from the reference ground 12 and is circularly polarized, and at least one circularly polarized probe beam is transmitted in a circularly polarized manner corresponding to a state in which the circularly polarized radiation source 11 is fed, and/or a reflected echo formed by reflection of the circularly polarized beam by a corresponding object is received. Wherein the circularly polarized radiation source 11 is arranged from a regular polygon or a circular basic form and comprises at least one degenerate mode separation unit 13 formed from the basic form in a hollowed out or epitaxial manner, wherein the area of each degenerate mode separation unit 13 is divided equally by a straight line passing through the physical center point 110 of the basic form, which is correspondingly named as an area dividing line 131, wherein when the physical center point of the degenerate mode separation unit 13 coincides with the physical center point 110 of the basic form, the degenerate mode separation unit 13 is symmetrical with the area dividing line 131 at the same time, wherein the circularly polarized radiation source 11 has a feeding point 111, wherein the circularly polarized radiation source 11 is not symmetrical with the connecting line of the feeding point 11 and the physical center point 110 of the basic form to form a circularly polarized arrangement for the circularly polarized radiation source 11, and the connecting line of the feeding point 11 and the physical center point 110 of the basic form forms an included angle of more or less than 45 ° with the area dividing line 131, thereby improving the circularly polarized characteristics of the circularly polarized microwave probe antenna 10 such that the circularly polarized probe antenna 10 tends to radiate in a more circularly polarized radiation range toward the circularly polarized antenna 10.

It should be noted that, the degenerate mode separation unit 13 may be formed by cutting, grooving, or partially recessing the basic form from the hollowing of the basic form, which is not limited by the present utility model.

In detail, in which the circularly polarized radiation source 11 is disposed from a square base form as an example, referring specifically to fig. 2A and 2B, the square has two pairs of center lines 112 and 113 passing through physical center points thereof and being perpendicular to each other, wherein one pair of center lines is two first center lines 112 perpendicular to two opposite sides of the square, wherein the other pair of center lines is two second center lines 113 connecting two opposite corners of the square, wherein the area bisector 131 is located at the first center line 112 or the second center line 113, wherein the feeding point 111 of the circularly polarized radiation source 11 is disposed in a state of being offset from the two first center lines 112 and the two second center lines 113 to form a structural form in which the circularly polarized radiation source 11 is not symmetrical with a line connecting the feeding point 11 and the physical center point 110 of the base form and an angle between the line connecting the feeding point 11 and the physical center point 110 of the base form and the area bisector 131 is greater than or less than 45 °, so that the circularly polarized radiation source 11 can form a circularly polarized antenna 10 when the circularly polarized radiation source 11 is detected at the feeding point 111. Wherein the circularly polarized radiation source 11 is capable of generating two degenerate modes with orthogonal polarizations when the circularly polarized radiation source 11 is fed at the feed point 111, wherein the degenerate mode separation unit 13 is configured to separate the resonant frequencies of the two degenerate modes with orthogonal polarizations to form a phase difference between the two degenerate modes that is orthogonal and tends to be 90 DEG, thereby forming a circularly polarized arrangement of the circularly polarized radiation source 11

In detail, referring to fig. 2C and 2D of drawings of the specification of the present utility model, the radiation pattern and the left-hand radiation pattern of the circularly polarized microwave probe antenna 10 are respectively illustrated, wherein the circularly polarized microwave probe antenna 10 is verified to have a superior circularly polarized characteristic based on the structure that the circularly polarized radiation source 11 is not symmetrical with the line connecting the feeding point 11 and the physical center point 110 of the basic form and the line connecting the feeding point 11 and the physical center point 110 of the basic form forms has an angle of more than or less than 45 ° with the area bisector 131, the radiation range of the circularly polarized microwave probe antenna 10 tends to be circular, and the left-hand gain of the circularly polarized microwave probe antenna 10 is close to the total gain as compared with fig. 2C and 2D.

It should be noted that, the circular polarization characteristic of the circular polarization microwave detecting antenna 10 is improved, and the energy of the detecting beam formed by the circular polarization microwave detecting antenna 10 alternately advances with the circular polarization characteristic, so that the energy in the 360 ° direction is balanced, and the adaptability of the circular polarization microwave detecting antenna 10 to different environments is improved. Then when the circularly polarized microwave probe antenna 10 is mounted on a corresponding mounting environment, such as a lamp housing, the area corresponding to the reference ground 12 is increased, but the beam of the circularly polarized microwave probe antenna 10 can still be maintained relatively stably, referring specifically to fig. 3A to 3C of the drawings of the specification of the present utility model, the simulation structure of the circularly polarized microwave probe antenna 10 mounted on the lamp housing and the radiation pattern and the left-hand radiation pattern thereof are respectively illustrated, as can be seen from comparison between fig. 1E and 3B, the radiation range of the circularly polarized microwave probe antenna 10 can still be rounded when mounted on the lamp housing, and the left-hand gain of the circularly polarized microwave probe antenna 10 is also close to the total gain when mounted on the lamp housing, as can be seen from comparison between fig. 3B and 3C, and the circularly polarized microwave probe antenna 10 has a superior circularly polarized characteristic.

In particular, corresponding to the embodiment shown in fig. 2A, wherein the circularly polarized radiation source 11 is circularly polarized from the basic form of a square, by cutting out two opposite corners of the square to form the degenerate mode separating element 13, the degenerate mode separating element 13 is formed integrally on the circularly polarized radiation source 11 in a simple and easy manner.

Preferably, the structure in which two opposite corners of the square are cut away corresponding to the circularly polarized radiation source 11 to form the degenerate mode separation unit 13, and the circularly polarized radiation source 11 is divided into four areas by two first central lines 112, the circularly polarized radiation source 11 has two corner cut areas with a corner cut design and two non-corner cut areas adjacent to the two corner cut areas respectively, wherein the feeding point 111 is preferably disposed in the non-corner cut areas, so as to further facilitate the formation of the circularly polarized microwave probe antenna 10 with better circular polarization characteristics.

Further, the circularly polarized microwave probe antenna 10 includes a strip transmission line 14, wherein the strip transmission line 14 is connected between the feeding point 111 and the corresponding feeding circuit, which is beneficial to the impedance matching design of the circularly polarized microwave probe antenna 10 and is beneficial to the impedance matching of the circularly polarized microwave probe antenna 10 and the size setting of the circularly polarized microwave probe antenna.

Specifically, in the structure corresponding to that illustrated in fig. 2A, in which the circularly polarized radiation source 11 is provided using a microstrip feed structure, one end of the corresponding strip transmission line 14 is connected to the circularly polarized radiation source 11, and the other end of the corresponding strip transmission line 14 is connected to a corresponding feed circuit, the corresponding feed point 111 is equivalently located at the point where the strip transmission line 14 is connected to the circularly polarized radiation source 11.

Preferably, at least one side of the strip transmission line 14 is provided with at least one ground point 16, wherein the ground point 16 is grounded to facilitate reducing radiation of the strip transmission line 14, thereby improving signal transmission quality of the strip transmission line 14.

Specifically, at least one pair of the grounding points 16 is disposed on two sides of the strip transmission line 14, and two grounding points 16 of the same pair of the grounding points 16 are symmetrically designed with the strip transmission line 14 as a center line, which is beneficial to reducing radiation of the strip transmission line 14, thereby improving signal transmission quality of the strip transmission line 14.

It should be noted that, the circularly polarized radiation source 11 is hollowed along the strip-shaped transmission line 14, and the circularly polarized radiation source 11 is correspondingly formed to have a concave design towards the physical center point 110 thereof, so as to form the feeding point 111 deep into the circularly polarized radiation source 11, so as to be beneficial to realizing corresponding impedance matching, and the strip-shaped transmission line 14 is located at the concave position of the circularly polarized radiation source 11, so that the circularly polarized radiation source 11 forms electromagnetic shielding for the strip-shaped transmission line 14, and further is beneficial to guaranteeing the anti-interference performance of the circularly polarized microwave detection antenna 10.

Further, wherein the circularly polarized microwave probe antenna 10 comprises a circuit substrate 15, wherein the circularly polarized radiation source 11 and the reference ground 12 are disposed on both sides of the circuit substrate 15 at intervals, wherein the circuit substrate 15 is disposed in a rectangular shape, wherein preferably the circularly polarized radiation source 11 is disposed in a state close to two of the connected sides of the circuit substrate 15, i.e. the circularly polarized radiation source 11 is disposed biased toward one of the corners of the circuit substrate 15 to facilitate the corresponding circuit layout of the circularly polarized microwave probe antenna 10.

Referring specifically to fig. 9 and 10 of the drawings, which are drawings, the product form of the circularly polarized microwave probe antenna 10 is schematically shown, wherein based on the fact that the circularly polarized radiation source 11 is close to two of the connected sides of the circuit substrate 15, other circuit elements of the circularly polarized microwave probe antenna 10 can be carried on the same side of the circuit substrate 15 as the circularly polarized radiation source 11, facilitating the production of the circularly polarized microwave probe antenna 10 and enabling the circularly polarized microwave probe antenna 10 to be mounted in a patch-mounted manner in a corresponding mounting area.

In particular, when the circularly polarized microwave probe antenna 10 is suitable for a single-sided patch, the circularly polarized radiation source 11 needs to adopt a microstrip feed structure or an edge feed structure, and the conflict between impedance matching and circularly polarized characteristics in size design is more obvious, and by the structural arrangement that the circularly polarized radiation source 11 of the present utility model is not symmetrical with the connection line between the feed point 11 and the physical center point 110 of the basic form and the area bisector 131 is greater than or less than 45 °, the circularly polarized microwave probe antenna 10 is optimized, so that the circularly polarized microwave probe antenna 10 can form a better circularly polarized characteristic.

It should be noted that, in this embodiment of the present utility model, the circularly polarized radiation source 11 is designed in a form of an integrated transceiver, that is, the circularly polarized radiation source 11 is disposed at the feeding point 111 to emit the circularly polarized detection beam in a circularly polarized manner when the circularly polarized radiation source is fed by receiving the corresponding excitation signal, and receives the reflected echo formed by the reflection of the circularly polarized beam by the corresponding object, so as to facilitate the miniaturization design of the circularly polarized microwave detection antenna 10, so that other circuit elements of the circularly polarized microwave detection antenna 10 can be carried on the same surface of the circuit substrate 15 as the circularly polarized radiation source 11. In detail, in practical application, the circularly polarized detection beam is easily reflected by an object for multiple times, when the circularly polarized detection beam is reflected by an even number of times, the formed corresponding reflected echo and the circularly polarized detection beam are co-rotating and can be received by the same circularly polarized radiation source 11, although in theory, the signal received by the circularly polarized radiation source 11 is weak due to attenuation of the signal caused by multiple reflections, the corresponding interference signal is weakened at the same time, and based on the advantage of circular polarization in terms of anti-interference, the signal finally received by the circularly polarized radiation source 11 in practice completely meets the corresponding use requirement, so that the circularly polarized microwave detection antenna 10 can work normally.

In particular, the circularly polarized radiation source 11 is also allowed to be disposed on the circuit substrate 15 in a state in which its physical center point 110 coincides with the physical center point of the circuit substrate 15, as shown in fig. 4, to which the present utility model is not limited.

Further, wherein the circularly polarized radiation source 11 is not limited to being fed with microstrip feed structures only, with specific reference to fig. 5 to 8 of the drawings of the description of the utility model, different feed structures of the circularly polarized radiation source 11 are illustrated.

Wherein corresponding to fig. 5 and 6, the circularly polarized radiation source 11 is provided with a probe feed structure, i.e. the feed circuit of the circularly polarized microwave probe antenna 10 is carried on a different surface of the circuit substrate 15 than the circularly polarized radiation source 11, and the feed circuit of the circularly polarized microwave probe antenna 10 is connected to the feed point 111 of the circularly polarized radiation source 11 in a probe feed structure.

Wherein, corresponding to fig. 5, the feeding point 111 is disposed in the non-corner cutting area, corresponding to fig. 6, the feeding point 111 is disposed in the corner cutting area, that is, the specific structural design of the circularly polarized microwave probe antenna 10 is flexible, which is beneficial to realizing corresponding circuit layout.

Further, corresponding to fig. 7, wherein the circularly polarized radiation source 11 is arranged with a side feed structure, corresponding to the circularly polarized radiation source 11 being connected to a respective excitation signal via a side feed 17, wherein the side feed 17 is a strip conductor adjacent and parallel to the straight side of the circularly polarized radiation source, wherein one end of the strip transmission line 14 is connected to the side feed 17, and the other end of the strip transmission line 14 is connected to a respective feed circuit, wherein the feed point 111 is electrically equivalent to the point where the side feed 17 is connected to the strip transmission line 14.

A modification of the strip transmission line 14 is illustrated corresponding to fig. 8, in which the strip transmission line 14 includes a main transmission line 141 and two power supply lines 142 led out from one end of the main transmission line 141, the other end of the main transmission line 141 is connected to a corresponding power supply circuit, and the corresponding power supply point 111 is equivalently located at one end of the main transmission line 141 connected to the two power supply lines 142, wherein the lengths of the two power supply lines 142 are equal.

It will be appreciated that in the above-described embodiment of the present disclosure, the circularly polarized radiation source 11 is disposed in a square basic configuration, but the circularly polarized radiation source 11 may be disposed in other types of regular polygons or circular basic configurations under the structural limitation that the circularly polarized radiation source 11 is not symmetrical about the line connecting the feeding point 11 and the physical center point 110 of the basic configuration and the angle between the line connecting the feeding point 11 and the physical center point 110 of the basic configuration and the area bisector 131 is greater than or less than 45 °.

Further, referring to fig. 11A, in which the circularly polarized radiation source 11 is disposed from a circular basic form, and the circularly polarized microwave probe antenna 10 can form a superior circular polarization characteristic under a structural constraint that the circularly polarized radiation source 11 is not symmetrical about a line connecting the feeding point 11 and the physical center point 110 of the basic form and an angle between the line connecting the feeding point 11 and the physical center point 110 of the basic form and the area bisector 131 is greater than or less than 45 °, wherein preferably the circularly polarized radiation source 11 is symmetrical about the area bisector 131.

In detail, referring to fig. 11B and 11C of the drawings of the specification of the present utility model, the radiation patterns and the left-hand radiation patterns of the circularly polarized microwave probe antenna 10 are respectively illustrated, wherein the radiation range of the circularly polarized microwave probe antenna 10 tends to be circular based on the structural arrangement that the feeding point 111 of the circularly polarized radiation source 11 is deviated from the two first central lines 112 and the two second central lines 113, and comparing fig. 11B and 11C, it is known that the left-hand gain of the circularly polarized microwave probe antenna 10 is close to the total gain, both exceeds 5.1dB, and the overall comparison of the structures that the left-hand gain can be reacted to by fig. 1H and 1I is significantly smaller than the total gain, and it is verified that the circularly polarized microwave probe antenna 10 has superior circularly polarized characteristics under the optimization of the present utility model.

It should be noted that, in these illustrations of the present utility model, the circularly polarized radiation source 11 is grounded at its physical center point 110, and specifically, the structure in which the circularly polarized radiation source 11 is directly grounded at its physical center point 110 is formed based on the electrical connection between the circularly polarized radiation source 11 and the reference ground 12. Equivalently, in some embodiments, the structural configuration that the circularly polarized radiation source 11 is equivalently grounded at the physical center point 12 of the circularly polarized radiation source 11 is formed based on the electrical connection between at least one group and/or at least one pair of grounding points on the circularly polarized radiation source 11 and the reference ground 12, wherein the grounding points of the same group are located at the vertexes of the same regular polygon taking the physical center point 110 of the circularly polarized radiation source 11 as a midpoint, the grounding points of the same group are distributed around the physical center point 110 of the circularly polarized radiation source 11 in an equiangular manner in a state equidistant from the physical center point 110 of the circularly polarized radiation source 11, the grounding points of the same pair are symmetrically distributed on the circularly polarized radiation source 11 in a state of the physical center point 110 of the circularly polarized radiation source 11, and the connecting line segments of the same pair are distributed around the physical center point 110 in an equiangular manner in a state equidistant from the physical center point 110 of the circularly polarized radiation source 11 with the physical center point 0 of the circularly polarized radiation source 11 as a midpoint.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.

Claims (14)

1. The circularly polarized microwave detection antenna is characterized by comprising:

a reference ground; and

a circularly polarized radiation source, wherein the circularly polarized radiation source is spaced from the reference ground, wherein the circularly polarized radiation source is derived from a regular polygon or a circular basic form and comprises at least one degenerate mode separation element formed hollowed out or epitaxially from the basic form, wherein the area of each degenerate mode separation element is equally divided by a line passing through the physical center point of the basic form, correspondingly named the line being an area bisector, wherein the degenerate mode separation element is simultaneously symmetrical with the area bisector when the physical center point of the degenerate mode separation element coincides with the physical center point of the basic form, wherein the circularly polarized radiation source has a feed point, wherein the circularly polarized radiation source is not arranged with circular polarization to the circularly polarized radiation source with a line connecting the feed point and the physical center point of the basic form, and the line connecting the feed point and the physical center point of the basic form is at an angle of more than or less than 45 ° to the area bisector.

2. The circularly polarized microwave probe antenna as claimed in claim 1, wherein the circularly polarized radiation is disposed from a basic form of a square having two pairs of center lines passing through physical center points thereof and perpendicular to each other, wherein one pair of center lines is two first center lines perpendicular to two opposite sides of the square, wherein the other pair of center lines is two second center lines connecting two opposite corners of the square, wherein the area bisector is located at the first center line or the second center line, wherein the feeding point is disposed in a state of being offset from the two first center lines and the two second center lines to form a structural form in which the circularly polarized radiation source is not symmetrical with a line connecting the feeding point and the physical center points of the basic form and an angle between the line connecting the feeding point and the physical center points of the basic form and the area bisector is greater than or less than 45 °.

3. The circularly polarized microwave probe antenna as claimed in claim 2, wherein the circularly polarized radiation originates from a basic form of a square, is circularly polarized by cutting out two opposite corners of the square to form the degenerate mode separating unit, so that the circularly polarized radiation source is capable of generating two degenerate modes orthogonal in polarization when the circularly polarized radiation originates from the feeding point to be fed, wherein the degenerate mode separating unit is configured to separate resonance frequencies of the two degenerate modes orthogonal in polarization to form a phase difference between the two degenerate modes orthogonal in orientation of 90 °, thus forming a circularly polarized arrangement of the circularly polarized radiation source.

4. A circularly polarized microwave probe antenna as claimed in claim 3, wherein the circularly polarized radiation source is divided into four regions by two of the first centerlines, respectively, and then the circularly polarized radiation source has two corner cut regions designed by corner cut and two non-corner cut regions respectively adjacent to the two corner cut regions, wherein the feeding point is disposed at the non-corner cut regions.

5. A circularly polarized microwave probe antenna as claimed in claim 3, wherein the circularly polarized radiation source is arranged with a probe feed structure.

6. A circularly polarized microwave probe antenna as claimed in claim 3, wherein the circularly polarized microwave probe antenna comprises a strip transmission line, wherein the strip transmission line feed is connected between the feed point and the respective feed circuit.

7. The circularly polarized microwave probe antenna as claimed in claim 6, wherein the strip transmission line is provided with two symmetrical ground points on both sides, the ground points being electrically connected to the reference ground.

8. The circularly polarized microwave probe antenna as claimed in claim 7, wherein the circularly polarized radiation source is provided using a microstrip feed structure, one end of the strip transmission line is connected to the circularly polarized radiation source, and the other end of the strip transmission line is connected to a corresponding feed circuit, and the corresponding feed point is equivalently located at a point where the strip transmission line is connected to the circularly polarized radiation source.

9. The circularly polarized microwave probe antenna as claimed in claim 6, wherein the strip transmission line comprises a main transmission line and two feeder lines led out from one end of the main transmission line, the other end of the main transmission line being connected to the corresponding feeder circuit, the corresponding feed point being located at the end of the main transmission line to which the two feeder lines are connected.

10. The circularly polarized microwave probe antenna as claimed in claim 6, wherein the circularly polarized radiation sources are arranged with a side feed structure, corresponding to the circularly polarized radiation sources being connected to respective excitation signals via a side feed, wherein the side feed is a strip conductor adjacent and parallel to a straight side of the circularly polarized radiation sources, wherein one end of the strip conductor is connected to the side feed and the other end of the strip conductor is connected to a respective feed circuit, wherein the feed point is electrically equivalent to the point at which the side feed is connected to the strip conductor.

11. The circularly polarized microwave probe antenna as claimed in claim 2, wherein the circularly polarized microwave probe antenna comprises a circuit substrate, wherein the circularly polarized radiation source and the reference ground are disposed on both sides of the circuit substrate, wherein the circuit substrate is disposed in a rectangular shape, and the circularly polarized radiation source is disposed in a state close to two of the connected sides of the circuit substrate.

12. The circularly polarized microwave probe antenna as claimed in claim 1, wherein the circularly polarized radiation source is disposed in a circular base form and symmetrical about the area bisector.

13. A circularly polarised microwave probe antenna according to any one of claims 1 to 12 wherein the circularly polarised radiation originates from a physical centre point of which is grounded.

14. A circularly polarized microwave probe antenna as claimed in claim 13, wherein the circularly polarized radiation source comprises at least one set and/or pair of ground points equiangularly arranged about its physical centre point in a state equidistant from its physical centre point to equivalently form a state in which the physical centre point of the circularly polarized radiation source is grounded.