CN113629385B - Antenna unit, array antenna and water flow speed measuring radar - Google Patents
Antenna unit, array antenna and water flow speed measuring radar Download PDFInfo
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- CN113629385B CN113629385B CN202110776223.7A CN202110776223A CN113629385B CN 113629385 B CN113629385 B CN 113629385B CN 202110776223 A CN202110776223 A CN 202110776223A CN 113629385 B CN113629385 B CN 113629385B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
Abstract
The invention discloses an antenna unit, an array antenna and a water flow speed measuring radar, wherein the antenna unit comprises a medium substrate, and a matching balun, a radiation vibrator arm, a microstrip feeder line and a matching network which are arranged on the medium substrate; the microstrip feeder is connected with the matching network; the matching balun is a metal layer, and a gap for electromagnetic coupling feed is formed in the metal layer; the matching balun is a slotted metal layer; the radiation oscillator arms are positioned at two sides of the upper end of the matching balun; and a distributed resistor is loaded on the radiation oscillator arm. Compared with the prior art, the array antenna can realize electromagnetic radiation with stable vertical polarization in the frequency range of 290MHz-390MHz, and has the characteristics of small wind resistance, light weight, low section, passive and active standing wave frequency bandwidth, stable radiation pattern, low side lobe level of horizontal pattern, narrow and flexible wave beam width of vertical pattern.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an array antenna applied to a water flow speed measuring radar and the water flow speed measuring radar.
Background
The water flow speed measuring radar mainly utilizes backward Bragg scattering and Doppler effect of water waves on radar electromagnetic waves to obtain radial flow speed information. The wavelength of the UHF radar is about 880mm, the information of the wave capillary wave and the gravitational wave can be extracted at the same time, the UHF radar is sensitive to the wave action, and the fine measurement of the flow velocity on the surface of the river can be realized.
In a water flow speed measuring radar system, an antenna plays a role in radiating and receiving electromagnetic waves. The traditional dipole antenna has narrow frequency band and has great limitation on the measurement sensitivity and detection efficiency of the radio frequency electromagnetic field; the conventional yagi antenna array has too high section, difficult adjustment of active standing waves, complex system and larger wind resistance coefficient. The array antenna with excellent performance applied to the water flow speed measuring radar has the index requirements of narrow lobe width, low side lobe level, high working frequency bandwidth, high gain and small return loss. On the premise of meeting the index requirements, the antenna array is required to reduce the section height, the wind resistance coefficient, the system weight and the system volume as much as possible and the system complexity.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides an antenna unit, an array antenna and a water flow speed measuring radar.
In order to solve the technical problems, the invention adopts the following technical scheme:
an antenna unit comprises a dielectric substrate, a matching balun, a radiation oscillator arm, a microstrip feeder line and a matching network, wherein the matching balun, the radiation oscillator arm, the microstrip feeder line and the matching network are arranged on the dielectric substrate; the microstrip feeder is connected with the matching network; the matching balun is a metal layer, and a gap for electromagnetic coupling feed is formed in the metal layer; the matching balun is a slotted metal layer; the radiation oscillator arms are positioned at two sides of the upper end of the matching balun; the radiating oscillator arm is characterized in that a distributed resistor is loaded on the radiating oscillator arm.
An array antenna is characterized by comprising a reflecting surface, a power divider, a beam shaper and an antenna unit; the antenna unit is fixed on the reflecting surface and is connected with the power divider; the power divider is connected with the beam former.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the antenna unit, the design of distributed resistance loading is carried out on the printed dipole antenna, so that the passive standing wave bandwidth of the antenna unit is greatly expanded on the premise of sacrificing very small radiation efficiency, and the pulse trailing amplitude is remarkably reduced.
2. According to the antenna unit, the umbrella-shaped oscillator arm is designed, so that the wind resistance coefficient is reduced, the distance between the antenna units in the vertical direction of the array is reduced, and compared with a yagi antenna array and other traditional antenna arrays, the cross section height is greatly reduced due to the adoption of the antenna units in the form of printed dipoles.
3. According to the array antenna, the width of the microstrip line of the matching network and the length of the vibrator arm are reasonably adjusted, and the loading of the isolation strip is matched, so that the expansion of the frequency band width of the active standing wave is realized in the feed network with the specific horizontal power ratio and the vertical amplitude-phase weighting, and the frequency band range of the integral active standing wave smaller than 2 reaches 290MHz-390 MHz.
4. According to the array antenna, the horizontal direction chebyshev weighted unequal power divider is designed, so that the level of the side lobe of the horizontal direction diagram is reduced, and SLL is more than 20dB.
5. According to the array antenna, the whole weight of the antenna array is reduced through the hollowing design of the metal grid reflecting surface.
6. The array antenna mainly utilizes the vertical digital beam forming device composed of the receiving module, the beam forming device, the self-adaptive beam forming controller and the control module to realize the function of vertical digital beam forming, and can flexibly carry out weighted phase shift according to the field test environment and the received echo, so that the receiving gain is concentrated in one direction, and the spatial resolution is improved.
Drawings
FIG. 1 is a front three-dimensional structure diagram of an array antenna applied to a water flow speed measuring radar;
FIG. 2 is a three-dimensional structure diagram of the reverse side of an array antenna applied to a water flow speed measuring radar;
fig. 3 is a front view of a printed dipole antenna element;
FIG. 4 is a diagram of the reverse side of a printed dipole antenna element;
FIG. 5 is a graph comparing the standing wave curves of the antenna unit without the resistor and after the resistor is loaded;
FIG. 6 is a graph of antenna element radiation waveforms for a loaded distributed resistor and an unloaded distributed resistor;
FIG. 7 is a schematic diagram of a horizontal power divider;
FIG. 8 is an H-plane directional diagram of the array antenna of the present invention at a frequency point of 340 MHz;
fig. 9 is a schematic block diagram of a vertical digital beamformer;
fig. 10 is an E-plane directional diagram of the array antenna of the present invention at a frequency point of 340MHz under a specific beamforming condition;
FIG. 11 is a graph showing the actual measurement results of two-element active standing waves in the middle of an array antenna and two-element active standing waves in the middle of a yagi antenna according to the present invention;
fig. 12 shows a graph of the measured standing wave results of the array antenna system of the present invention.
Detailed Description
Fig. 1-2 show an array antenna applicable to a water flow speed measuring radar, comprising a printed dipole antenna unit 1, a metal grid reflecting surface 2, a horizontal power divider 3, a vertical beam former 4 and a spacer 5. The isolating strips are fixed on the fixed baffle plate of the metal grid reflecting surface through screws, so that the effect of adjusting mutual coupling among antenna units is achieved, and the bandwidth of the active standing wave is expanded. The horizontal power divider and the vertical digital beam forming device are arranged on the other side of the metal grid reflecting surface, and the digital beam forming device can be flexibly arranged in the radar host case according to the actual test site assembly conditions. The printed dipole antenna unit is connected with the horizontal power divider in the horizontal direction through a flexible radio frequency cable; the horizontal power divider is connected with the vertical digital beam forming device in the vertical direction through a flexible radio frequency cable. And the horizontal direction power divider is used for reducing the level of a side lobe of the horizontal direction graph. A vertical beamformer for specific spatial beamforming, for example, may concentrate vertical electromagnetic energy in the range of normal to 20 ° downtilt under one use condition.
The antenna array is used for transmitting and receiving vertical polarized space electromagnetic waves of 290MHz to 390MHz.
The isolating bars are positioned near the midpoints of the connecting lines of the tail ends of the two printed dipole antenna unit oscillator arms in the horizontal direction, and the isolating bars are composed of a vertical plane perpendicular to the metal grid reflecting surface and a horizontal plane parallel to the metal grid reflecting surface. The vertical plane height of the isolation strip is 0.05lambda 1 ～0.15λ 1 Length of 0.05λ 1 ～0.15λ 1 The method comprises the steps of carrying out a first treatment on the surface of the The horizontal plane length of the isolating strip is 0.05lambda 1 ～0.15λ 1 Width of 0.05λ 1 ～0.1λ 1 Wherein lambda is 1 At 340MHz vacuum wavelength. It is worth emphasizing that the spacer is not required to be fully loaded due to the influence of actual processing errors and test environments, and only a part of spacer is required to be loaded according to the field test result.
In one embodiment, shown in FIG. 1, a 4×6 area array printed dipole vertically polarized array antenna is provided with 24 antenna elements, with a horizontal spacing of 0.3λ 1 ～0.7λ 1 A vertical pitch of 0.4λ 1 ～0.8λ 1 Wherein lambda is 1 At 340MHz vacuum wavelength.
The printed dipole antenna unit 1 is fixed above the metal grid reflecting surface 2 through a metal chassis with a plastic slot, the horizontal direction power divider 3 is fixed below the metal grid reflecting surface 2 through screws, the vertical direction digital beam former 4 is fixed below the metal grid reflecting surface 2 through screws, the printed dipole antenna unit 1 is connected with the horizontal direction power divider 3 through a flexible radio frequency cable, and the horizontal direction power divider 3 is connected with the vertical direction digital beam former 4 through a flexible radio frequency cable. The isolating strips 5 are fixed on the fixed baffle plate of the metal grid reflecting surface 2 through screws.
Fig. 3-4 show block diagrams of printed dipole antenna elements. The printed dipole antenna unit 1 comprises a dielectric substrate 11, a microstrip feeder 12, a matching network 13, a matching balun 14 and a radiating element arm 15.
In one embodiment, the antenna unit further includes a radome 16. The radome 16 is located outside the dielectric substrate, the matching balun, the radiating element arm, the microstrip feed line and the matching network, and is used for protecting the structure therein from being damaged in the transportation and use processes and playing a role in waterproofing.
Specifically, the dielectric substrate 11 is a PCB board having a relative dielectric constant of 2.55 and a thickness of 1mm, and has an umbrella shape. The microstrip feed line 12 has a width of 2.74mm such that its characteristic impedance is 50Ω and a length of 50mm, with the feed point located at the bottom quarter of the dielectric substrate 11.
Specifically, the matching network 13 is composed of a first microstrip line matching section 131, a second microstrip line matching section 132, and a third open microstrip line matching section 133. The first microstrip line matching section 131 has a width of 1.4mm and a length of 134.3mm and is connected with the microstrip feeder 12; the second microstrip line matching section 132 has a width of 2.4mm and a length of 60mm, and is connected with the first microstrip line matching section 131; the third open-circuit microstrip line matching section 133 has a width of 1.4mm and a length of 112.3mm, and is connected to the second microstrip line matching section 132.
Specifically, the matching balun 14 is a rectangular copper foil with a slotted gap, and is coated on the surface of the dielectric substrate 11 with a height of 0.2λ 1 ～0.4λ 1 ，λ 1 At 340MHz vacuum wavelength. The width of the gap is 1mm, so that the characteristic impedance of the coplanar waveguide formed by the balun and the dielectric substrate is close to 50Ω, and further impedance matching of the next matching section is facilitated, and the length of the matching section is 170mm.
The radiating element arm 15 has a front view in the shape of a parallelogram inclined downward, has lower wind resistance characteristics than a conventional rectangular radiating element arm, and can optimally reduce the overall size of the antenna array in the vertical direction.
The radiating oscillator arm may be umbrella-shaped, elliptical, triangular or the like, in addition to rectangular.
Specifically, N gaps are formed at the position 3/5 of the length from the tail end of the radiation oscillator arm 15, and N is more than or equal to 2. Distributed resistance loading is performed in the gap. In the invention, the design of distributed resistance loading is innovatively carried out on the printed dipole antenna unit, the loading resistors 151, 152 and 153 do not load resistance values according to a conventional Wu-King distributed resistance loading equation, a formula (1) based on exponential resistance loading is selected, and the obtained result is tidied through multiple debugging on the premise of ensuring radiation efficiency as much as possible.
Wherein i takes a value of 0-2; r is R 0 The resistance value at the beginning of loading; r is R i The resistance value is loaded; a is a constant, and 10 to 20 is taken; l is the single-arm length of the umbrella-shaped antenna; y is 0 A distance between the initial loading point and the feeding point; y is i Is the distance between the loading point i and the feeding point.
In one embodiment, the number of slits at the end of the radiating arm 15 is 3, and the loaded resistors are 151, 152 and 153 respectively towards the end of the arm. The two arms of the radiation vibrator arm are respectively divided into three gaps with the width of 1.2mm, and the gaps are bilaterally symmetrical. The loading resistor is 11 in each gap and is in the form of a chip resistor; loading resistors 151, 152 and 153 in parallel with resistance R towards the tail end of vibrator arm 0 、R 1 And R is 2 3.6Ω, 18.2Ω, 72.7Ω, respectively.
As the distributed resistor loading is only carried out at the position close to the tail end of the vibrator arm, compared with the traditional mode of carrying out the distributed resistor loading on the vibrator arm, the radiation efficiency index is ensured, and the radiation efficiency is only reduced by 20% after simulation and test (the actual gain is tested in a darkroom), but the bandwidth of the passive standing wave is greatly improved. Through actual processing tests, compared with a Wu-King loading formula, the passive standing wave bandwidth obtained according to the exponential type resistance loading formula is wider, and is improved from 302 MHz-378 MHz to 295 MHz-384 MHz, so that the exponential type formula is selected to carry out distributed resistance loading on the array antenna unit. FIG. 5 shows a graph comparing standing wave curves of antenna elements after loading no resistors, distributed resistor loading according to a Wu-King loading formula and distributed resistor loading according to an exponential formula.
Since the duty ratio of the waveform emitted by the water flow speed measuring radar is very small and is similar to pulse wave, the fidelity of the waveform after being radiated to space is very important, the conventional printed dipole antenna without loading the distributed resistor can enable the radiation waveform to have larger tailing due to the end current reflection effect, the pulse tailing can be obviously restrained after the resistor is loaded, the resolution of a radar system is improved, and an electric field probe is arranged at 150cm positions of the printed dipole antenna unit and the antenna unit without loading the resistor, so that the radiation waveform diagram of the antenna unit with loading the distributed resistor and the antenna unit without loading the distributed resistor is obtained, and is shown in fig. 6.
Specifically, the metal mesh reflecting surface 2 is in a shape of a square or round hole digging on a rectangular surface, and the side length of the square is 0.01-0.1λ 1 The radius of the circle is 0.01-0.05lambda 1 Wherein lambda is 1 At 340MHz vacuum wavelength.
Fig. 7 shows a schematic diagram of the structure of the horizontal direction power divider 3. The horizontal power divider 3 is composed of a strip line 31, an upper dielectric substrate 32, a lower dielectric substrate 32, an isolation patch resistor 33, a shielding cavity 34 and an SMA-K connector 35, wherein the strip line 31 is printed on the surface of the lower dielectric substrate and is pressed at the center by the upper dielectric substrate 32 through plastic screws, and the isolation patch resistor 33 is welded at a specific position of the strip line 31 to play a role of isolating a power division port. The shielding cavity 34 wraps the upper and lower dielectric substrates 32, plays a role in protecting internal structures and shielding electromagnetic interference, and the SMA-K connector 35 is welded at the output and output ports of the power divider, so that the cable connection function is achieved. The horizontal power divider 3 is an unequal power divider, the power ratio is 0.4:1:1:0.4, standing wave ratio of each port is good, isolation effect of an output port is excellent, and the effect of reducing the side lobe level in the horizontal direction is obvious. In the case where the vertical digital beamformer is not operating (i.e., the vertical constant amplitude in-phase excitation), an H-plane pattern of the inventive array antenna at a frequency of 340MHz is obtained, as shown in fig. 8. As can be seen from the graph, the half-power beam width of the array antenna is 32.6 degrees, the index requirement smaller than 35 degrees is met, the side lobe level is controlled very low, SLL is more than 21dB, and the capability of resisting electromagnetic interference of the array antenna is improved.
Specifically, the vertical digital beamformer 4 is composed of a reception module, a beamformer, an adaptive beamforming controller, and a software control module, and a basic principle and structural block diagram thereof is shown in fig. 9. The adaptive beam forming controller obtains corresponding amplitude-phase coefficients according to an adaptive algorithm based on received signals and priori knowledge, and is also a core of the vertical digital beam forming device. The general working principle is that the method is based on known parameters such as sampling frequency, sampling bandwidth, transmitting antenna track height, antenna installation angle, carrier center frequency and the like; combining the received signal intensities of the real-time channels with the delay of each channel relative to the central channel; and generating real-time amplitude and phase coefficients according to the target beam coverage range and the target beam width preset in the test field. The vertical digital beam forming device can be fixedly arranged on the lower side of the metal grid reflecting surface, and can also be flexibly arranged in a case of the radar host. In a particular case, the amplitude weighting factors are determined by an adaptive algorithm based on an optimized neural network, such that electromagnetic energy is concentrated in the vertical direction in the range of from normal to 20 ° downtilt, where the amplitude weighting factors are respectively 0.6, 1, 0.55, 0.1, 0.2, 0.18, and the phase shift angles are respectively-35 °, 15 °, 25 °, 21 °, -70 °, and-30 °. In this special case, an E-plane directional diagram of the array antenna of the present invention at a frequency point of 340MHz after digital beamforming is obtained, which is shown in fig. 10. From the figure, the far field energy of the array antenna of the invention is intensively radiated in the range of 0-25 degrees in the range of the normal direction to the depression angle of 90 degrees, and the half power beam width of the antenna is 18.7 degrees, so that the target echo can be detected more accurately.
Fig. 11 shows graphs of actual measurement results of the two-element active standing wave in the middle of the array antenna and the two-element active standing wave in the middle of the yagi antenna of the present invention. The test method is mainly characterized in that the coupling coefficient between all antennas under the passive condition is measured, and the coupling coefficient is obtained by the following formula (2) and the formula (3):
wherein, in the array antenna of the invention, n=24, s nx Is the coupling coefficient between the nth radiating element and the xth radiating element; a, a n A complex voltage that excites the nth radiating element under active conditions; a, a x A complex voltage that excites the x-th radiating element under active conditions; τ x An active reflection coefficient for the x-th radiating element; VSWR x Is the active standing wave ratio of the x-th radiating element.
The active standing wave bandwidth of the antenna units in the array can be effectively improved by adjusting the height and width of the matching network and the isolation strips 5 of the antenna units. As can be seen from fig. 11, the active standing wave of the array antenna (the middle two units, taking the two radiating units as references, are the most affected by mutual coupling) is basically smaller than 2 in the frequency band range, and most of the active standing wave of the yagi antenna array is larger than 2 in the frequency band range.
Fig. 12 shows a graph of the measured standing wave results of the array antenna system of the present invention. The standing wave of the array antenna system is smaller than 2 in the frequency band range, the result reflects the standing wave ratio condition of the whole antenna feed network when the printed dipole antenna unit, the horizontal power divider and the vertical digital beam former are connected together, and the array antenna can well meet the performance requirement of the water flow speed measuring radar.
The embodiments described above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made in the equivalent manner, and are included in the scope of the present invention.
Claims (7)
1. An antenna unit comprises a dielectric substrate, a matching balun, a radiation oscillator arm, a microstrip feeder line and a matching network, wherein the matching balun, the radiation oscillator arm, the microstrip feeder line and the matching network are arranged on the dielectric substrate; the microstrip feeder is connected with the matching network; the matching balun is a metal layer, and a first gap for electromagnetic coupling feed is formed in the metal layer; the radiation oscillator arms are positioned at two sides of the upper end of the matching balun; the radiating oscillator arm is characterized in that a distributed resistor is loaded on the radiating oscillator arm;
the radiation oscillator arms are parallelograms which incline downwards, the matching balun is rectangular, the gap starts to be positioned at the middle position of the upper end of the rectangle, and the two oscillator arms and the matching balun form an umbrella-shaped structure; at least one second gap parallel to the matching balun is formed in each radiation oscillator arm, and the distributed resistors are arranged in the second gaps;
the number of the second gaps on each vibrator arm is N, a row of distributed resistors loaded by a plurality of patches in parallel are arranged in each second gap, and the parallel resistance values of the N rows of distributed resistors are respectively as follows:
wherein, i takes the value of 0 to N-1; r is R 0 The resistance value at the beginning of loading; r is R i The resistance value is loaded; a is a constant, and 10 to 20 is taken; l is the single-arm length of the umbrella-shaped antenna; y is 0 A distance between the initial loading point and the feeding point; y is i Is the distance between the loading point i and the feeding point.
2. An antenna unit according to claim 1, characterized in that: the matching network is composed of a first microstrip line matching section, a second microstrip line matching section and a third open-circuit microstrip line matching section, and the first microstrip line matching section is connected with a microstrip feeder line; the second microstrip line matching section is a bending section, and the third open-circuit microstrip line matching section is parallel to the first microstrip line matching section.
3. An array antenna comprising a reflecting surface, a power divider, a beam former and an antenna element according to any one of claims 1-2; the antenna unit is fixed on the reflecting surface and is connected with the power divider; the power divider is connected with the beam former.
4. The array antenna of claim 3, wherein the reflecting surface is a metal mesh reflecting surface; the power divider is a horizontal power divider; the beamformer is a vertical digital beamformer.
5. The array antenna of claim 4, wherein a spacer for adjusting mutual coupling between antenna elements is further provided on the reflecting surface; the isolating strip is positioned near the midpoint of the connecting line of the tail ends of the two radiating oscillator arms in the horizontal direction and consists of a vertical plane perpendicular to the metal grid reflecting surface and a horizontal plane parallel to the metal grid reflecting surface; the vertical plane height of the isolating strip is 0.05lambda 1 ～0.15λ 1 Length of 0.05λ 1 ～0.15λ 1 The method comprises the steps of carrying out a first treatment on the surface of the The horizontal plane length of the isolating bar is 0.05lambda 1 ～0.15λ 1 Width of 0.05λ 1 ～0.1λ 1 Wherein lambda is 1 At 340MHz vacuum wavelength.
6. The array antenna of claim 5, wherein: the space gap of the metal grid reflecting surface is square or round, and the side length of the square is 0.01lambda 1 ～0.1λ 1 A circular radius of 0.01λ 1 ～0.05λ 1 Wherein lambda is 1 At 340MHz vacuum wavelength.
7. A water flow speed measuring radar, characterized by comprising an array antenna according to any one of claims 3-6; for transmitting and receiving vertical polarized spatial electromagnetic waves of 290MHz to 390MHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107331965A (en) * | 2017-07-19 | 2017-11-07 | 广东通宇通讯股份有限公司 | Low gain low sidelobe micro-base station antenna |
| CN108717993A (en) * | 2018-04-17 | 2018-10-30 | 西安电子科技大学 | A kind of wide band high-gain omnidirectional antenna based on integrated design |
| CN109244636A (en) * | 2018-08-30 | 2019-01-18 | 华中科技大学 | A kind of ground exploring radar antenna with distributed resistance load |
| CN112310630A (en) * | 2020-11-05 | 2021-02-02 | 西安电子科技大学 | Wide-band high-gain printed antenna |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107331965A (en) * | 2017-07-19 | 2017-11-07 | 广东通宇通讯股份有限公司 | Low gain low sidelobe micro-base station antenna |
| CN108717993A (en) * | 2018-04-17 | 2018-10-30 | 西安电子科技大学 | A kind of wide band high-gain omnidirectional antenna based on integrated design |
| CN109244636A (en) * | 2018-08-30 | 2019-01-18 | 华中科技大学 | A kind of ground exploring radar antenna with distributed resistance load |
| CN112310630A (en) * | 2020-11-05 | 2021-02-02 | 西安电子科技大学 | Wide-band high-gain printed antenna |
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