CN111541000B - Ultra-wideband radar antenna - Google Patents
Ultra-wideband radar antenna Download PDFInfo
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- CN111541000B CN111541000B CN202010546360.7A CN202010546360A CN111541000B CN 111541000 B CN111541000 B CN 111541000B CN 202010546360 A CN202010546360 A CN 202010546360A CN 111541000 B CN111541000 B CN 111541000B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/001—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems for modifying the directional characteristic of an aerial
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
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Abstract
The invention discloses an ultra-wideband radar antenna which comprises a metal reflecting back cavity, an antenna substrate, an antenna feed point and a flat antenna, wherein a medium loaded in the metal reflecting back cavity is a medium mixed by a wave-absorbing material and a non-wave-absorbing material. The invention has the advantages of simple structure, easy realization, capability of improving the radiation efficiency and the capability of the antenna, optimized radar detection performance and the like.
Description
Technical Field
The invention mainly relates to the technical field of ultra-wideband radars, in particular to an ultra-wideband radar antenna.
Background
Under the scenes of jungle penetration, hidden targets, clutter, sight shielding environments and the like, the ultra-wideband radar system has better detection sensing capability in the aspects of high-resolution mapping, radar imaging, buried or hidden target detection and the like, has better advantages compared with detection equipment of other types and systems, and is widely applied to the aspects of life detection and search, wall-penetrating investigation, geological structure inversion and the like under the scene of obstacle shielding.
The ultra-wideband radar antenna is one of the key components of the ultra-wideband radar system, and has the functions of radiating electromagnetic signals and receiving reflected echoes of a target area, and the performance of the ultra-wideband radar antenna directly influences the performance of various performance indexes of the radar system. In an ultra-wideband radar system with medium penetration capability, the working frequency band is generally low, the size of an antenna unit is large, and in order to enhance the directional radiation and receiving capability of the antenna unit, a metal reflection back cavity is generally designed, the depth of the metal reflection back cavity is related to the wavelength of the working frequency band of the antenna, and the depth of the metal reflection back cavity is generally designed according to a quarter of the wavelength corresponding to the central working frequency. In order to reduce the depth of the cavity, microwave absorbing materials are generally arranged in the reflecting cavity. The microwave absorbing material, also called wave absorbing material, is a material capable of absorbing microwave and electromagnetic energy and having small reflection and scattering, also called radar absorbing material or radar stealth material. The basic principle of microwave absorption is to convert microwave energy into energy in other forms of motion through some physical mechanism of action and into thermal energy through the dissipative action of that motion. All forms of lossy motion induced by microwaves can be the absorption mechanism. Common mechanisms are electrical induction, magnetic induction, electromagnetic induction, and electromagnetic scattering. Practical microwave absorbing materials may often work by a variety of mechanisms. The existence of the wave-absorbing material can not only reduce the size of the radar, but also play a role in matching.
Generally, the wave-absorbing material can fill the whole reflection cavity (except for radio frequency components such as a radar transmitter and a receiver), and for radar equipment with a pulse system, the wave-absorbing material can absorb electromagnetic wave energy, so that the radiation capability of a radar is weakened, and meanwhile, a received signal is weakened, so that a received echo signal is weakened, and the normal performance of the radar performance is influenced. That is, when the wave-absorbing material fills the whole metal reflection back cavity, the electromagnetic signals and energy of forward radiation can be absorbed while the backward radiation signals of the antenna are absorbed, so that the radiation and the received electromagnetic signals and energy are weakened; if the metal reflection back cavity is not filled with wave-absorbing materials, the electromagnetic waves radiated in the reverse direction can be reflected for multiple times in the metal reflection back cavity, so that the ringing of the transmitted and received pulse waveforms is increased, the pulse tailing is enhanced, the waveforms are distorted, and the performance of the radar is influenced.
The purpose of loading the wave-absorbing material into the reflecting back cavity is to reduce the radiation of the antenna to the reflecting cavity, form the effect of directional unilateral radiation and enhance the directional radiation performance of the antenna. The wave-absorbing material absorbs electromagnetic energy, the depth of the reflection cavity is one quarter of the wavelength corresponding to the radar working center frequency, the electromagnetic wave can be reflected to change the propagation direction when reaching the bottom of the metal reflection cavity, at the moment, the phase is turned over by 180 degrees, the phase change corresponding to the path of the quarter wavelength is 90 degrees, the two paths of the quarter wavelength change the phase for two times and are added to 180 degrees, the two 180 degrees are added to 360 degrees, the phase of the electromagnetic wave reaching the surface of the antenna is consistent with the phase of forward radiation of the electromagnetic wave, and therefore the directional radiation effect is formed.
When the wave-absorbing material is in direct contact with an antenna, particularly the lower surface of a flat antenna (the surface of the flat antenna facing a metal reflecting back cavity), not only backward radiation energy but also forward radiation electromagnetic wave energy are absorbed, and when the wave-absorbing material is in contact with the area near the feed point of the antenna, the intensity of induced current is stronger because the intensity of induced current in the area near the feed point is larger, the intensity of induced current is stronger, the intensity of induced current is greatly weakened, the intensity of induced current is directly related to the intensity of antenna radiation, and the intensity of antenna radiation directly influences the performance of the radar, so that the radar performance is reduced and weakened by the way of filling the wave-absorbing material in the metal reflecting back cavity.
In summary, the prior art radar antenna has the following disadvantages:
1) in the existing ultra-wideband radar antenna with a metal reflective back cavity, a microwave absorbing material (a wave absorbing material for short) or a material with a high dielectric constant is generally filled in the reflective back cavity, and the functions of the antenna comprise antenna feed impedance matching, cavity depth reduction, radiation tailing reduction, pulse ringing suppression, waveform fidelity and the like.
2) When the reflecting back cavity is completely filled with the wave-absorbing material, the antenna feed point is also filled with the wave-absorbing material, so that the absorption of electromagnetic waves and induced currents at the feed point is large, the radiation energy of the electromagnetic waves and induced currents is low, the transmitting energy of the radar is weakened, and the signal receiving capability of the radar is weakened.
3) The reflecting back cavity is completely filled with the high-dielectric-constant dielectric material, and under the condition of the same length/depth dimension, the equivalent wavelength of the high-dielectric-constant material is long, so that the depth dimension of the reflecting back cavity can be reduced, but the general weight is larger, the feed matching is difficult, the pulse trailing amplitude is large, the actual radiation and electromagnetic wave receiving effects are poor, and the radar performance can be influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing technical problems, the invention provides the ultra-wideband radar antenna which is simple in structure, easy to realize, capable of improving the radiation efficiency and the radiation capability of the antenna and optimizing the radar detection performance.
In order to solve the technical problems, the invention adopts the following technical scheme:
an ultra-wideband radar antenna comprises a metal reflection back cavity, an antenna substrate, an antenna feed point and a flat antenna, wherein a medium loaded in the metal reflection back cavity is a medium mixed by a wave-absorbing material and a non-wave-absorbing material.
As a further improvement of the invention: the medium of the non-wave-absorbing material is tightly attached to the lower surface of the panel antenna, and the wave-absorbing material is arranged below the medium of the non-wave-absorbing material (towards the direction of the metal reflection back cavity).
As a further improvement of the invention: the non-wave-absorbing material medium is tightly attached to the lower surface of the panel antenna, the non-wave-absorbing material medium is arranged below the antenna feed point and the surrounding area, and the parts except the antenna feed point and the surrounding area are filled with wave-absorbing materials or materials with the capacity of absorbing electromagnetic waves.
As a further improvement of the invention: two or one dielectric material with high dielectric constant or electromagnetic wave absorption capacity is added in the metal reflection back cavity.
As a further improvement of the invention: when two dielectric materials with high dielectric constants or electromagnetic wave absorption capability are adopted, the electromagnetic parameters of the two dielectric materials with high dielectric constants or electromagnetic wave absorption capability are consistent or inconsistent.
As a further improvement of the invention: the metal reflecting back cavity is made of metal materials, or the surface of the metal reflecting back cavity is coated with metal powder, or metal foil is pasted on the metal reflecting back cavity.
As a further improvement of the invention: the metal reflection back cavity is internally provided with a transmitting-receiving antenna isolation plate which is made of metal materials, or the surface of the transmitting-receiving antenna isolation plate is coated with metal powder, or metal foil is pasted on the transmitting-receiving antenna isolation plate.
As a further improvement of the invention: the low dielectric constant medium adopts foam and pearl wool.
As a further improvement of the invention: the non-wave-absorbing material medium is a material with the equivalent dielectric constant of 1-1.5.
As a further improvement of the invention: the metal reflecting back cavity is made of metal materials, or the surface of the metal reflecting back cavity is coated with metal powder, or metal foil is pasted on the metal reflecting back cavity; the metal reflection back cavity is internally provided with a transmitting-receiving antenna isolation plate which is made of metal materials, or the surface of the transmitting-receiving antenna isolation plate is coated with metal powder, or metal foil is pasted on the transmitting-receiving antenna isolation plate.
Compared with the prior art, the invention has the advantages that:
1. according to the ultra-wideband radar antenna, aiming at the problem that the performance of radar is influenced by the wave-absorbing material in the reflection cavity, the radiation efficiency and the radiation capacity of the antenna can be improved and the detection performance of the radar can be optimized on the premise of not increasing the size of the reflection cavity by adopting the layout mode of mixing the wave-absorbing material in the reflection cavity and the non-wave-absorbing material.
2. The ultra-wideband radar antenna is characterized in that a material with a low dielectric constant (such as foam or pearl wool or the like or an equivalent dielectric constant of 1-1.5) is filled in a region close to the lower surface (the surface facing a metal reflection back cavity) of the antenna and near a feed point, so that the absorption of the wave-absorbing material on electromagnetic energy is greatly weakened, the radiation efficiency of the antenna is improved, meanwhile, the wave-absorbing material is filled in a region close to the lower surface and the end region of the antenna, the matching (pulse ringing suppression and trailing weakening) of the tail end of the antenna is kept, and the capability of radar radiation and weak signal receiving is not influenced. The invention has good practical value for high-efficiency radiation and good matching of the antenna.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the ultra-wideband radar antenna of the present invention.
Fig. 2 is a schematic diagram of the structural principle of the present invention in a specific application example 1.
Fig. 3 is a schematic diagram of a three-dimensional assembly structure of the invention in a specific application example 1.
Fig. 4 is a schematic diagram of the structural principle of the invention in a specific application example 2.
Fig. 5 is a schematic diagram of a three-dimensional assembly structure of the invention in a specific application example 2.
Fig. 6 is a schematic diagram of the structural principle of the invention in a specific application example 3.
Fig. 7 is a schematic diagram of a three-dimensional assembly structure of the invention in a specific application example 3.
Fig. 8 is a schematic diagram of the structural principle of the present invention in the specific application example 4.
Fig. 9 is a schematic diagram of a three-dimensional assembly structure of the invention in a specific application example 4.
Fig. 10 is a schematic diagram of the structural principle of the present invention in a specific application example 5.
Fig. 11 is a schematic diagram of a three-dimensional assembly structure of the invention in a specific application example 5.
Fig. 12 is a schematic diagram of the suppression of pulse waveform ringing in a specific application example of the present invention.
Illustration of the drawings:
1. a metal reflective back cavity; 2. a transmit-receive antenna isolation plate; 3. an antenna substrate; 4. an antenna feed point; 5. a flat antenna; 6. a wave-absorbing material; 7. a low dielectric constant medium; 8. a dielectric material having a high dielectric constant or an ability to absorb electromagnetic waves.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1-3, an ultra-wideband radar transmitting/receiving antenna of the present invention is an ultra-wideband radar transmitting/receiving antenna with a metal reflective back cavity 1, and its basic structure is the same as that of a conventional ultra-wideband radar antenna, i.e. it includes a metal reflective back cavity 1, a transmitting/receiving antenna isolation plate 2, an antenna substrate 3, an antenna feed point 4, a flat antenna 5 (antenna metal radiation patch), and a wave-absorbing material 6, which will not be described herein again. The innovation of the invention is that the medium loaded in the metal reflecting back cavity 1 is the medium mixed by the wave-absorbing material 6 and the non-wave-absorbing material. Namely, the following two layouts can be adopted, but not limited to the following two layouts:
(a) the medium of the non-wave-absorbing material is tightly attached to the lower surface (the surface facing the metal reflecting back cavity 1) of the flat antenna 5, and the wave-absorbing material 6 is arranged below the medium of the non-wave-absorbing material (the direction facing the metal reflecting back cavity 1).
(b) The medium of the non-wave-absorbing material is tightly attached to the lower surface of the panel antenna 5, the non-wave-absorbing material medium is arranged below the antenna feed point 4 and the surrounding area, and the parts except the antenna feed point 4 and the surrounding area are filled with the wave-absorbing material 6 or other materials with the capacity of absorbing electromagnetic waves.
On the basis of the structure, the invention can further add two or one dielectric material 8 with high dielectric constant or electromagnetic wave absorption capacity to the metal reflective back cavity 1 as an optimized scheme, and when two dielectric materials are adopted, the electromagnetic parameters of the two dielectric materials can be consistent or inconsistent.
In the specific application example, the metal reflective back cavity 1 is generally made of metal, or coated with metal powder on the surface, or pasted with metal foil.
In the specific application example, the transceiver antenna isolation board 2 is generally made of metal, or coated with metal powder on the surface, or pasted with metal foil.
In a specific application example, the low dielectric constant medium 7 may be foam or pearl wool or other dielectric material with an equivalent dielectric constant similar to that of air and a value between 1 and 1.5 according to actual needs.
The present invention is illustrated by way of example as a particular application, but the scope of the invention is not limited to the following examples. The core of the embodiment of the invention is that: filling a low dielectric constant dielectric material (the equivalent dielectric constant of which is close to 1) in the area near the antenna feed point 4 and close to the lower surface of the antenna, and filling wave-absorbing materials and/or other dielectric materials with high dielectric constant in the lower surface of the antenna and other space areas in the metal reflecting back cavity 1; the change principle of the filling materials of the lower surface of the antenna and other space areas in the metal reflecting back cavity 1 is that the impedance matching of the antenna feed point 4 is good, the radiation energy in the designated direction is high, and the radiation efficiency is high.
Example 1: as shown in fig. 2 and fig. 3, the ultra-wideband radar transmitting-receiving antenna of the present invention has a metal reflective back cavity 1, and the loading medium in the metal reflective back cavity 1 is a wave-absorbing material 6 and a low-dielectric-constant medium 7. Wherein, the low dielectric constant medium 7 is tightly attached to the lower surface of the transmitting-receiving panel antenna 5, and the antenna feed point 4 and the lower part of the surrounding area are all the low dielectric constant medium 7; the lower part and other areas of the low dielectric constant medium 7 are filled with the wave-absorbing material 6. The main functions of the present embodiment are: the low-dielectric-constant dielectric materials 7 distributed around the antenna feed point 4 weaken the absorption capacity of the microwave absorbing material 6 on electromagnetic energy radiated by the antenna, improve the capacity of the microwave absorbing material 6 on external radiation electromagnetic signals and the strength of converting the received electromagnetic signals into electric signals, and meanwhile, the microwave absorbing material 6 below the tail end of the antenna has the capacity of inhibiting pulse waveform trailing and ringing and ensuring pulse waveform fidelity.
Example 2: as shown in fig. 4 and 5, the ultra-wideband radar transmitting-receiving antenna of the present invention has a metal reflective back cavity 1, and the loading medium in the metal reflective back cavity 1 is a wave-absorbing material 6 and a low dielectric constant medium 7; the low dielectric constant medium 7 is tightly attached to the lower surface (the surface facing the direction of the metal reflecting back cavity 1) of the transmitting and receiving panel antenna 5, and the lower area tightly attached to the transmitting and receiving panel antenna 5 is completely the low dielectric constant medium 7; the wave-absorbing material 6 is filled under the low dielectric constant medium 7. The main functions of the present embodiment are: the low-dielectric-constant dielectric material 7 distributed below the antenna weakens the absorption capacity of the microwave absorbing material 6 on the electromagnetic energy radiated by the antenna, improves the capacity of the microwave absorbing material on externally radiating electromagnetic signals and the strength of converting the received electromagnetic signals into electric signals; since the low-k dielectric material 7 is also disposed under the end of the line, the capability of suppressing trailing and ringing of the pulse waveform and fidelity of the pulse waveform is weaker than that of embodiment 1.
Example 3: as shown in fig. 6 and 7, the ultra-wideband radar transmitting-receiving antenna of the present invention has a metal reflective back cavity 1, and the loading medium in the metal reflective back cavity 1 is a wave-absorbing material 6, a low dielectric constant medium 7, a high dielectric constant or a medium material 8 with electromagnetic wave absorption capability; the low dielectric constant medium 7 is tightly attached to the lower surface of the transmitting and receiving panel antenna 5, the areas close to the feeding point below the transmitting and receiving panel antenna 5 are all low dielectric constant media 7, and the areas, close to the antenna below, at the two ends of the antenna are filled with a dielectric material 8 with high dielectric constant or electromagnetic wave absorption capacity; the rest space of the metal reflecting back cavity 1 is filled with wave-absorbing material 6.
The main functions of the present embodiment are: the low-dielectric-constant dielectric material 7 distributed below the antenna weakens the absorption capacity of the microwave absorbing material 6 on the electromagnetic energy radiated by the antenna, improves the capacity of the microwave absorbing material on externally radiating electromagnetic signals and the strength of converting the received electromagnetic signals into electric signals; the dielectric material 8 with high dielectric constant or electromagnetic wave absorbing ability is arranged below the end of the wire, so that the ability of inhibiting pulse waveform tailing and ringing and pulse waveform fidelity is weaker than that of the embodiment 1, but stronger than that of the embodiment 2.
Example 4: as shown in fig. 8 and 9, the ultra-wideband radar transceiver antenna of the present invention has a metal reflective back cavity 1, and the loading medium in the metal reflective back cavity 1 is a wave-absorbing material 6, a low dielectric constant medium 7, two kinds of medium materials 8 with high dielectric constants or electromagnetic wave absorption ability; the low dielectric constant medium 7 is tightly attached to the lower surface of the transmitting and receiving panel antenna 5, the areas close to the feed point below the transmitting and receiving panel antenna 5 are all low dielectric constant media 7, and the areas below the two ends of the antenna tightly attached to the transmitting and receiving panel antenna 5 are filled with a dielectric material 8 with high dielectric constant or electromagnetic wave absorption capacity; the bottom space of the metal reflecting back cavity 1 is filled with wave absorbing materials 6; other areas of the metal reflective back cavity 1 are filled with the same or different dielectric materials 8 with high dielectric constant or electromagnetic wave absorption capability.
This example differs from example 3 in that: a part of the thickness of the microwave absorbing material 6 in the embodiment 3 is replaced by a dielectric material 8 with high dielectric constant or electromagnetic wave absorption capacity, so that the capacity of the transmitting and receiving panel antenna 5 for externally radiating electromagnetic signals and the capacity of receiving electromagnetic signals and converting the electromagnetic signals into electric signal strength are stronger than those in the embodiment 3; but its ability to suppress pulse waveform tailing and ringing, pulse waveform fidelity was weaker than that of example 3.
Example 5: as shown in fig. 10 and 11, the ultra-wideband radar transceiver antenna of the present invention has a metal reflective back cavity 1, and the loading medium in the metal reflective back cavity 1 is a wave-absorbing material 6, a low dielectric constant medium 7, two kinds of medium materials 8 with high dielectric constants or electromagnetic wave absorption ability; the low dielectric constant medium 7 is tightly attached to the lower surface of the transmitting and receiving panel antenna 5, the areas close to the lower feed point of the transmitting and receiving panel antenna 5 are all low dielectric constant media 7, and the areas under the antenna, two ends of which are tightly attached to the transmitting and receiving panel antenna 5, are filled with a dielectric material 8 with high dielectric constant or electromagnetic wave absorption capacity; the bottom layer space of the metal reflecting back cavity 1 is filled with the same or different dielectric materials 8 with high dielectric constants or electromagnetic wave absorption capacity; the rest space of the metal reflecting back cavity 1 is filled with wave-absorbing material 6.
This example differs from example 4 in that: the microwave absorbing material 6 of the embodiment 4 and the dielectric material 8 with high dielectric constant or the ability of absorbing electromagnetic waves are replaced in the arrangement order, so that the distance between the microwave absorbing material 6 and the transmitting-receiving panel antenna 5 is closer, and the ability of the microwave absorbing material to radiate electromagnetic signals outside and the ability of receiving the electromagnetic signals and converting the electromagnetic signals into electric signal strength are weaker than those of the embodiment 4; but its ability to suppress pulse waveform tailing and ringing, pulse waveform fidelity, was stronger than that of example 4.
As can be seen from the above embodiments, the present invention is directed to solving the contradiction between the antenna radiation performance and the directional radiation and the antenna end matching; the high radiation performance of the antenna requires that the induced current on the surface of the antenna is completely converted into electromagnetic waves radiated to the space; for an ultra-wideband antenna, directional radiation is desirable to convert all electromagnetic energy radiated in a non-directional manner into radiation in a specified direction, or to absorb the electromagnetic energy so as to prevent interference with radiation and receiving effects in the specified direction; in the existing ultra-wideband radar antenna with the metal reflective back cavity 1, the wave-absorbing material 6 is completely filled in the metal reflective back cavity 1, so that under the condition that the tail end of the antenna reaches a certain matching (pulse ringing suppression and trailing weakening), the electromagnetic energy on the surface of the antenna is also greatly absorbed, and the radiation efficiency and the radiation capacity of the antenna are weakened. Meanwhile, the wave-absorbing material 6 is filled in the areas close to the lower surface of the antenna (the surface facing the metal reflecting back cavity 1) and near the feed point, so that the matching of the tail end of the antenna (pulse ringing suppression and trailing reduction) is kept, and the capabilities of radar radiation and weak signal receiving are not influenced. The antenna has the capability of ensuring the optimal performance of the antenna, and the 5 embodiments have good practical values on high-efficiency radiation and good matching of the antenna.
The test result shows that compared with the scheme that the wave-absorbing material is completely filled in the metal reflecting back cavity 1, the radiation efficiency of the antenna is improved by not less than 20%, the suppression on pulse waveform ringing is improved by more than 50%, and the waveform fidelity is improved by more than 50% in the embodiment 1 provided by the invention. As shown in fig. 12, pulse tailing and ringing are suppressed well, and waveform fidelity is high.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned examples, and any technical solutions that fall under the idea of the present invention fall within the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. An ultra-wideband radar antenna comprises a metal reflection back cavity (1), an antenna substrate (3), an antenna feed point (4) and a flat antenna (5), and is characterized in that a medium loaded in the metal reflection back cavity (1) is a medium mixed by a wave-absorbing material (6) and a non-wave-absorbing material; the non-wave-absorbing material medium is a low dielectric constant medium material (7) or a medium material with the equivalent dielectric constant of 1-1.5; and non-wave-absorbing material media are filled on the lower surfaces, close to the panel antenna (5), of the antenna feed point (4) and the lower surfaces of the surrounding areas.
2. The ultra-wideband radar antenna according to claim 1, characterised in that a wave-absorbing material (6) is present below the medium of non-wave-absorbing material.
3. The ultra-wideband radar antenna according to claim 1, characterized in that the dielectric of the non-absorbing material is tightly attached to the surface of the plate antenna (5) facing the metal reflective back cavity, and the parts except the antenna feed point (4) and the surrounding area are filled with absorbing material (6) or material capable of absorbing electromagnetic waves.
4. The ultra-wideband radar antenna according to claim 3, characterized in that two or one dielectric material (8) with high dielectric constant or ability to absorb electromagnetic waves is added in the metallic reflective back cavity (1).
5. The ultra-wideband radar antenna according to claim 4, characterized in that when two dielectric materials (8) with high dielectric constants or the ability to absorb electromagnetic waves are used, the electromagnetic parameters of the two dielectric materials (8) with high dielectric constants or the ability to absorb electromagnetic waves are identical or not.
6. The ultra-wideband radar antenna according to any of claims 1 to 5, characterised in that the metallic reflective back cavity (1) is made of metal, or is surface coated with metal powder, or is coated with metal foil.
7. The ultra-wideband radar antenna according to any of claims 1 to 5, wherein a transmitting and receiving antenna isolation plate (2) is arranged in the metal reflective back cavity (1), and the transmitting and receiving antenna isolation plate (2) is made of metal, or has a surface coated with metal powder, or is attached with metal foil.
8. The ultra-wideband radar antenna according to any one of claims 1 to 5, wherein the non-absorbing material medium is foam or pearl wool.
9. The ultra-wideband radar antenna according to any of claims 1 to 5, characterized in that the metallic reflective back cavity (1) is made of metal, or is coated with metal powder or is coated with metal foil; the metal reflection back cavity (1) is internally provided with a transmitting and receiving antenna isolation plate (2), and the transmitting and receiving antenna isolation plate (2) is made of metal materials, or the surface of the transmitting and receiving antenna isolation plate is coated with metal powder, or metal foil is pasted on the transmitting and receiving antenna isolation plate.
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| CN2746566Y (en) * | 2004-08-30 | 2005-12-14 | 中国电子科技集团公司第五十研究所 | Small positioning radiation super broadband receiv/transfer antenna |
| CN201616503U (en) * | 2010-04-08 | 2010-10-27 | 湖南华诺星空电子技术有限公司 | Ultra-wide band transmitting/receiving antenna used for life SAR detecting instrument |
| CN108598702A (en) * | 2018-04-23 | 2018-09-28 | 中国电子科技集团公司第二十九研究所 | A kind of ultra wide band low profile antenna array structure |
| CN109411900A (en) * | 2018-12-14 | 2019-03-01 | 湖南华诺星空电子技术有限公司 | A kind of broad-band antenna for through-wall radar imaging |
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