CN112467351A - Multi-resonance excitation back cavity antenna - Google Patents
Multi-resonance excitation back cavity antenna Download PDFInfo
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- CN112467351A CN112467351A CN202011299876.2A CN202011299876A CN112467351A CN 112467351 A CN112467351 A CN 112467351A CN 202011299876 A CN202011299876 A CN 202011299876A CN 112467351 A CN112467351 A CN 112467351A
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
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Abstract
The invention discloses a multi-resonance excitation back cavity antenna, belonging to the technical field of broadband back cavity antennas, and the antenna comprises: the multi-resonance groove bowtie vibrator comprises two vibrator monomers which are symmetrically arranged and are completely the same, and each vibrator monomer is a symmetric body; end part resonance grooves are formed in the opposite side edges of the two vibrator units, the end part resonance grooves are located on the symmetrical middle lines of the vibrator units, and the notches of the end part resonance grooves are arranged in an opposite mode; the opposite side edges of the two vibrator monomers are respectively provided with a long resonance groove and a short resonance groove, and the notches of any two opposite long resonance grooves and two opposite short resonance grooves on different vibrator monomers are oppositely arranged; the grooving directions of the end part resonant groove, the long resonant groove and the short resonant groove are all arranged along the oscillator direction, so that the aims of eliminating directional diagram distortion existing in the broadband bowtie oscillator and the open sleeve oscillator excitation cavity-backed antenna and realizing bandwidth expansion are fulfilled.
Description
Technical Field
The invention belongs to the technical field of broadband back cavity antennas, and particularly relates to a multi-resonance excitation back cavity antenna.
Background
The broadband cavity-backed antenna excited by the bowtie oscillator and the open-type sleeve oscillator is the mainstream form of the existing broadband short cavity-backed antenna, and the bandwidth of the standing wave coefficient is generally 2: 1-2.5: 1, its radiation pattern is prone to distortion at the high end of the frequency.
Disclosure of Invention
In view of this, in order to solve the above problems in the prior art, an object of the present invention is to provide a multi-resonance excited cavity-backed antenna to achieve the purposes of eliminating the pattern distortion existing in the broadband bow-tie element and the open sleeve element excited cavity-backed antenna and expanding the bandwidth.
The technical scheme adopted by the invention is as follows: a multi-resonant excited cavity-backed antenna, comprising: the multi-resonance groove bowtie vibrator comprises two vibrator monomers which are symmetrically arranged and are completely the same, and each vibrator monomer is a symmetric body;
end part resonance grooves are formed in the opposite side edges of the two vibrator units, the end part resonance grooves are located on the symmetrical middle lines of the vibrator units, and the notches of the end part resonance grooves are arranged in an opposite mode;
the opposite side edges of the two vibrator monomers are respectively provided with a long resonance groove and a short resonance groove, and the notches of any two opposite long resonance grooves and two opposite short resonance grooves on different vibrator monomers are oppositely arranged;
wherein, each the fluting direction in tip resonance groove, long resonance groove and short resonance groove all sets up along the oscillator direction, makes bowtie oscillator directional diagram bandwidth extend and reach 3 through many resonance grooves: 1.
further, the length of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.25-0.3 wavelength, the width of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.15-0.2 wavelength, and the thickness of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.01-0.02 wavelength, wherein the wavelength is the wavelength of the low-end waveband of the resonant frequency.
Furthermore, the selection range of the slot width of the end part resonant slot is 0.02-0.04 wavelength, and the selection range of the slot length is 0.05-0.1 wavelength, wherein the wavelength is the wavelength of the low end wave band of the resonant frequency.
Furthermore, each long resonance groove and each short resonance groove on the same oscillator unit are respectively arranged symmetrically relative to the symmetry line of the oscillator unit, and the short resonance grooves and the long resonance grooves are sequentially arranged from the symmetry line to two sides.
Further, the groove width of the long resonant groove and the short resonant groove is selected to be in a range of 0.004-0.007 wavelengths, the length of a single short resonant groove is selected to be in a range of 0.01-0.025 wavelengths, the length of a single long resonant groove is selected to be in a range of 0.025-0.05 wavelengths, and the wavelengths are wavelengths of a low-end waveband of the resonant frequency.
Further, the antenna further includes:
the rectangular reflection cavity is used for accommodating the multi-resonance groove bowtie oscillator, the length-width ratio of the rectangular reflection cavity is selected to be within a range of 1.05-1.25, the distance between the multi-resonance groove bowtie oscillator and the bottom surface of the rectangular reflection cavity is selected to be within a range of 0.35-0.45 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonance frequency; the length-width ratio of the rectangular reflecting back cavity is adjusted, so that the radiation impedance of the antenna changes more gradually in a band, and the high-frequency radiation directional diagram E surface and the high-frequency radiation directional diagram H surface of the antenna are equalized.
Furthermore, the width of the rectangular reflective cavity is selected to be in a range of 0.35-0.45 wavelength, and the wavelength is the wavelength of the low-end waveband of the resonant frequency, and the depth of the rectangular reflective cavity is selected to be in a range of 0.5-0.55 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency.
Furthermore, the rectangular reflection cavity is provided with an embedded impedance converter used for installing the multi-resonance groove bowtie vibrator, and exciting oscillation current on the multi-resonance groove bowtie vibrator through the embedded impedance converter.
Further, the antenna further includes:
the dielectric antenna housing is arranged on the rectangular reflecting cavity, the distance between the inner top surface of the dielectric antenna housing and the upper surface of the multi-resonant groove bowtie vibrator is selected to be 0.1-0.15 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency; the dielectric radome not only protects the inside of the antenna, but also can adjust the distance between the dielectric radome cover body and the top surface of the multi-resonance groove bowtie oscillator through the cover body thickness of the dielectric radome, so that the change of the multi-resonance groove bowtie oscillator in the radiation impedance band of the reflection cavity is gentle.
Furthermore, the dielectric radome is made of a low-loss dielectric material with a dielectric constant of 3.0-3.5, the thickness of the dielectric radome is selected within a range of 0.025-0.05 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
The invention has the beneficial effects that:
1. by adopting the multi-resonance excitation back cavity antenna provided by the invention, the bowtie vibrator is subjected to slotting design, the structural design is simple, and under the multi-resonance effect of the slotted bowtie vibrator and the loading and adjusting action of the dielectric antenna cover and the rectangular reflection cavity, the embedded impedance converter (1/4 wavelength impedance converter) can meet the requirements of 3: 1, the standing wave coefficient bandwidth and the directional diagram bandwidth can reach 3: 1, the directional diagram distortion defect of the existing broadband bowtie oscillator and open sleeve oscillator excitation back cavity antenna can be eliminated.
Drawings
FIG. 1 is a top view of the interior of a multi-resonant excited cavity-backed antenna provided by the present invention;
FIG. 2 is a cross-sectional view taken along plane E (along the vibrator direction) of FIG. 1;
FIG. 3 is a cross-sectional view taken along plane H (in a direction perpendicular to the vibrator) of FIG. 1;
FIG. 4 is an example of the standing wave coefficients (F2/F1-3) for a multi-resonant excited cavity-backed antenna provided by the present invention;
FIG. 5 is an example of the radiation pattern (F1, 0/90 cross section) of a multi-resonant cavity-backed antenna provided by the present invention;
FIG. 6 is an example of the radiation pattern (F0, 0/90 cross section) of a multi-resonant cavity-backed antenna provided by the present invention;
FIG. 7 is an example of the radiation pattern (F2, 0/90 cross section) of a multi-resonant cavity-backed antenna provided by the present invention;
the drawings are labeled as follows:
the antenna comprises a 1-rectangular reflection cavity, a 2-multi-resonant-groove bowtie vibrator, a 3-feeding point, a 4-double-line balancer, a 5-embedded impedance converter and a 6-dielectric antenna cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
In this embodiment, a multi-resonance excited back cavity antenna is specifically provided, and the bandwidth of the standing wave coefficient (standing wave coefficient is better than 3.0) of the multi-resonance excited back cavity antenna is 3: 1 or more, in 3: 1 within the working bandwidth, the radiation pattern is symmetrical, the multi-resonance excitation back cavity antenna mainly comprises: the multi-resonant-groove bowtie vibrator, the rectangular reflecting cavity and the dielectric radome are specifically designed as follows:
multiple resonant slot bowtie vibrator
As shown in fig. 1, the multiple resonant slot bowtie oscillator includes two oscillator units which are symmetrically arranged and identical with respect to a longitudinal symmetry line, the oscillator units are shaped like wing pieces of a butterfly, and each oscillator unit is a symmetric body, that is, the oscillator units are symmetrically designed with respect to a transverse symmetry line, and the two oscillator units are integrated to form the multiple resonant slot bowtie oscillator. The parameter design for the multi-resonant slot bowtie vibrator is as follows: the length of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.275 wavelengths, the width of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.175 wavelengths, and the thickness of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.015 wavelengths, where the wavelengths are wavelengths in the low-end band of the resonant frequency.
End part resonance grooves are formed in the opposite side edges of the two oscillator single bodies, the symmetry lines of the end part resonance grooves are located on the symmetry middle lines of the oscillator single bodies, and the notches of the end part resonance grooves are arranged in an opposite mode; the parameters for the end resonant slot are designed as follows: the slot width of the end resonant slot is selected to be in the range of 0.03 wavelength and the slot length is selected to be in the range of 0.075 wavelength, where the wavelength is the wavelength of the lower band of the resonant frequency.
The opposite side edges of the two vibrator units are respectively provided with a long resonant tank and a short resonant tank, any two opposite long resonant tanks on different vibrator units are named as a pair of long resonant tanks, and the notches of the long resonant tanks in each pair of long resonant tanks are oppositely arranged; similarly, any two short resonance grooves on different oscillator units are named as a pair of short resonance grooves, and the notches of the short resonance grooves in each pair of short resonance grooves are oppositely arranged. In the design of this embodiment, each of the long resonant slots and each of the short resonant slots on the same oscillator unit are symmetrically arranged with respect to a lateral symmetry line of the oscillator unit, and the short resonant slots and the long resonant slots are sequentially arranged from the lateral symmetry line to both sides, that is: the short resonance groove and the long resonance groove are arranged on the same side of the transverse symmetry line, and the short resonance groove and the long resonance groove are also arranged on the other same side of the transverse symmetry line. And the parameters for the long and short resonant tanks are designed as follows: the groove width of the long resonance groove and the short resonance groove is selected within a range of 0.0055 wavelength, the length of a single short resonance groove is selected within a range of 0.0175 wavelength, the length of a single long resonance groove is selected within a range of 0.0375 wavelength, and the wavelength is the wavelength of the low-end waveband of the resonance frequency.
In the above, the opening direction of each of the end resonant groove, the long resonant groove, and the short resonant groove is provided along the vibrator direction.
② rectangular reflecting cavity
As shown in fig. 2, the rectangular reflection cavity is used for accommodating the multi-resonant slot bow-tie oscillator, and the aspect ratio of the rectangular reflection cavity is adjusted, so that the radiation impedance of the antenna changes more gradually in a band, and the high-frequency radiation pattern E plane and the high-frequency radiation pattern H plane of the antenna are equalized. The aspect ratio of the rectangular reflective cavity is chosen to be in the range of typical values 1.15: and 1, the distance between the multi-resonant-groove bowtie oscillator and the bottom surface of the rectangular reflecting cavity is selected to be within 0.4 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency.
The specific design parameters for the rectangular reflective cavity are as follows: the width of the rectangular reflective cavity is selected to be in the range of 0.4 wavelengths, which is the wavelength of the lower band of the resonant frequency, and the depth of the rectangular reflective cavity is selected to be in the range of 0.525 wavelengths, which is the wavelength of the upper band of the resonant frequency.
In practical application, a double-line balancer is arranged in the rectangular reflecting cavity, the embedded impedance converter is fixedly installed through the double-line balancer, the multi-resonance groove bowtie vibrator is installed on the embedded impedance converter, the multi-resonance groove bowtie vibrator is connected with the embedded impedance converter through a feed point, electromagnetic energy is input through the coaxial port, and oscillation current is excited on the multi-resonance groove bowtie vibrator through the embedded impedance converter.
Third medium antenna cover
As shown in fig. 3, the dielectric radome is mounted on the rectangular reflection cavity, and the dielectric radome can protect the interior of the antenna and can be adjusted by the thickness of the frontal cover body of the dielectric radome and the distance between the frontal cover body and the top surface of the multi-resonance-slot bow-tie vibrator, so that the change of the multi-resonance-slot bow-tie vibrator in the radiation impedance band in the reflection cavity is smooth. The method specifically comprises the following steps: the distance between the inner top surface of the dielectric radome and the upper surface of the multi-resonant slot bow-tie vibrator is selected to be within 0.125 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
Specific design parameters for the dielectric radome are as follows: the dielectric radome is made of a low-loss dielectric material with a dielectric constant of 3.25, the thickness of the dielectric radome is selected from a range of 0.0375 wavelengths, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
Based on the above design to multi-resonance groove bowtie oscillator, rectangle reflection cavity and medium antenna house respectively, the principle of multi-resonance excitation back cavity antenna of this embodiment at the during operation is as follows:
electromagnetic energy is input through the coaxial port, and oscillation current is excited on the multi-resonant-groove bow-tie vibrator through the embedded impedance converter. One part directly radiates to the external space, the other part radiates to the external space after being reflected by the rectangular reflecting cavity, and the two parts of microwave signals are subjected to vector synthesis in the external space. The standing wave coefficient bandwidth (standing wave coefficient is better than 3.0) of the multi-resonance excitation back cavity antenna reaches 3: 1 or more, in 3: 1, the radiation pattern is symmetrical, and typical performances are shown in fig. 4-7.
Example 2
The multi-resonance excitation back cavity antenna provided in this embodiment has the same design idea and working principle as those of embodiment 1, and only has different specific parameters, and mainly includes: the multi-resonant-groove bowtie vibrator, the rectangular reflecting cavity and the dielectric radome are specifically designed as follows:
multiple resonant slot bowtie vibrator
The multi-resonance-slot bowtie vibrator comprises two vibrator monomers which are symmetrically arranged relative to a longitudinal symmetry line and are completely the same, the shape of each vibrator monomer is similar to that of a wing butterfly, each vibrator monomer is a symmetric body, namely the vibrator monomers are symmetrically designed relative to a transverse symmetry line, and the two vibrator monomers are integrated to form the multi-resonance-slot bowtie vibrator. The parameter design for the multi-resonant slot bowtie vibrator is as follows: the length of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.25 wavelength, the width of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.15 wavelength, and the thickness of the multi-resonant slot bowtie oscillator is selected to be within a range of 0.01 wavelength, wherein the wavelength is the wavelength of the low-end waveband of the resonant frequency.
End part resonance grooves are formed in the opposite side edges of the two oscillator single bodies, the symmetry lines of the end part resonance grooves are located on the symmetry middle lines of the oscillator single bodies, and the notches of the end part resonance grooves are arranged in an opposite mode; the parameters for the end resonant slot are designed as follows: the selection range of the slot width of the end part resonance slot is 0.02 wavelength and the selection range of the slot length is 0.05 wavelength, and the wavelength is the wavelength of the low-end wave band of the resonance frequency.
The opposite side edges of the two vibrator units are respectively provided with a long resonant tank and a short resonant tank, any two opposite long resonant tanks on different vibrator units are named as a pair of long resonant tanks, and the notches of the long resonant tanks in each pair of long resonant tanks are oppositely arranged; similarly, any two short resonance grooves on different oscillator units are named as a pair of short resonance grooves, and the notches of the short resonance grooves in each pair of short resonance grooves are oppositely arranged. In the design of this embodiment, each of the long resonant slots and each of the short resonant slots on the same oscillator unit are symmetrically arranged with respect to a lateral symmetry line of the oscillator unit, and the short resonant slots and the long resonant slots are sequentially arranged from the lateral symmetry line to both sides, that is: the short resonance groove and the long resonance groove are arranged on the same side of the transverse symmetry line, and the short resonance groove and the long resonance groove are also arranged on the other same side of the transverse symmetry line. And the parameters for the long and short resonant tanks are designed as follows: the groove width selection range of the long resonant groove and the short resonant groove is 0.004 wavelength, the length selection range of a single short resonant groove is 0.01 wavelength, the length selection range of a single long resonant groove is 0.025 wavelength, and the wavelength is the wavelength of the low-end waveband of the resonant frequency.
In the above, the opening direction of each of the end resonant groove, the long resonant groove, and the short resonant groove is provided along the vibrator direction.
② rectangular reflecting cavity
The rectangular reflection cavity is used for accommodating the multi-resonance groove bowtie oscillator, and the length-width ratio of the rectangular reflection cavity is adjusted, so that the change of the radiation impedance of the antenna in a band is more gradual, and the high-frequency radiation directional diagram E surface and the high-frequency radiation directional diagram H surface of the antenna are equalized. In design, the length-width ratio of the rectangular reflecting cavity is selected to be in a range of 1.05: and 1, the distance between the multi-resonant-groove bowtie oscillator and the bottom surface of the rectangular reflecting cavity is selected to be within 0.35 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency.
The specific design parameters for the rectangular reflective cavity are as follows: the width of the rectangular reflective cavity is selected to be in the range of 0.35 wavelength, which is the wavelength of the lower band of the resonant frequency, and the depth of the rectangular reflective cavity is selected to be in the range of 0.5 wavelength, which is the wavelength of the upper band of the resonant frequency.
In practical application, a double-line balancer is arranged in the rectangular reflecting cavity, the embedded impedance converter is fixedly installed through the double-line balancer, the multi-resonance groove bowtie vibrator is installed on the embedded impedance converter and connected with the embedded impedance converter through a feed point, electromagnetic energy is input through the coaxial port, and oscillation current is excited on the multi-resonance groove bowtie vibrator through the embedded impedance converter.
Third medium antenna cover
The dielectric antenna housing is arranged on the rectangular reflection cavity, the interior of the antenna can be protected by the dielectric antenna housing, and the change of the multi-resonance-groove bowtie oscillator in a radiation impedance band in the reflection cavity is gentle through the thickness of a forehead cover body of the dielectric antenna housing and the adjustment of the distance between the dielectric antenna housing and the top surface of the multi-resonance-groove bowtie oscillator. The method specifically comprises the following steps: the distance between the inner top surface of the dielectric radome and the upper surface of the multi-resonant slot bowtie oscillator is selected to be 0.1 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
Specific design parameters for the dielectric radome are as follows: the dielectric radome is made of a low-loss dielectric material with a dielectric constant of 3.0, the thickness of the dielectric radome is selected from a range of 0.025 wavelengths, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
Example 3
The multi-resonance excitation back cavity antenna provided in this embodiment has the same design idea and working principle as those of embodiment 1, and only has different specific parameters, and mainly includes: the multi-resonant-groove bowtie vibrator, the rectangular reflecting cavity and the dielectric radome are specifically designed as follows:
multiple resonant slot bowtie vibrator
The multi-resonance-slot bowtie vibrator comprises two vibrator monomers which are symmetrically arranged relative to a longitudinal symmetry line and are completely the same, the shape of each vibrator monomer is similar to that of a wing butterfly, each vibrator monomer is a symmetric body, namely the vibrator monomers are symmetrically designed relative to a transverse symmetry line, and the two vibrator monomers are integrated to form the multi-resonance-slot bowtie vibrator. The parameter design for the multi-resonant slot bowtie vibrator is as follows: the length selection range of the multi-resonance groove bowtie vibrator is 0.3 wavelength, the width selection range of the multi-resonance groove bowtie vibrator is 0.2 wavelength, and the thickness selection range of the multi-resonance groove bowtie vibrator is 0.02 wavelength, wherein the wavelength is the wavelength of the low-end waveband of the resonance frequency.
End part resonance grooves are formed in the opposite side edges of the two oscillator single bodies, the symmetry lines of the end part resonance grooves are located on the symmetry middle lines of the oscillator single bodies, and the notches of the end part resonance grooves are arranged in an opposite mode; the parameters for the end resonant slot are designed as follows: the selection range of the slot width of the end part resonance slot is 0.04 wavelength and the selection range of the slot length is 0.1 wavelength, and the wavelength is the wavelength of the low-end wave band of the resonance frequency.
The opposite side edges of the two vibrator units are respectively provided with a long resonant tank and a short resonant tank, any two opposite long resonant tanks on different vibrator units are named as a pair of long resonant tanks, and the notches of the long resonant tanks in each pair of long resonant tanks are oppositely arranged; similarly, any two short resonance grooves on different oscillator units are named as a pair of short resonance grooves, and the notches of the short resonance grooves in each pair of short resonance grooves are oppositely arranged. In the design of this embodiment, each of the long resonant slots and each of the short resonant slots on the same oscillator unit are symmetrically arranged with respect to a lateral symmetry line of the oscillator unit, and the short resonant slots and the long resonant slots are sequentially arranged from the lateral symmetry line to both sides, that is: the short resonance groove and the long resonance groove are arranged on the same side of the transverse symmetry line, and the short resonance groove and the long resonance groove are also arranged on the other same side of the transverse symmetry line. And the parameters for the long and short resonant tanks are designed as follows: the groove width selection range of the long resonance groove and the short resonance groove is 0.007 wavelengths, the length selection range of a single short resonance groove is 0.025 wavelengths, the length selection range of a single long resonance groove is 0.05 wavelengths, and the wavelengths are the wavelengths of the low-end wave band of the resonance frequency.
In the above, the opening direction of each of the end resonant groove, the long resonant groove, and the short resonant groove is provided along the vibrator direction.
② rectangular reflecting cavity
The rectangular reflection cavity is used for accommodating the multi-resonance groove bowtie oscillator, and the length-width ratio of the rectangular reflection cavity is adjusted, so that the change of the radiation impedance of the antenna in a band is more gradual, and the high-frequency radiation directional diagram E surface and the high-frequency radiation directional diagram H surface of the antenna are equalized. In design, the length-width ratio of the rectangular reflecting cavity is selected to be in a range of 1.25: and 1, the distance between the multi-resonant-groove bowtie oscillator and the bottom surface of the rectangular reflecting cavity is selected to be within 0.45 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency.
The specific design parameters for the rectangular reflective cavity are as follows: the width of the rectangular reflective cavity is selected to be in the range of 0.45 wavelengths which are wavelengths in the lower band of the resonant frequency, and the depth of the rectangular reflective cavity is selected to be in the range of 0.55 wavelengths which are wavelengths in the upper band of the resonant frequency.
In practical application, a double-line balancer is arranged in the rectangular reflecting cavity, the embedded impedance converter is fixedly installed through the double-line balancer, the multi-resonance groove bowtie vibrator is installed on the embedded impedance converter and connected with the embedded impedance converter through a feed point, electromagnetic energy is input through the coaxial port, and oscillation current is excited on the multi-resonance groove bowtie vibrator through the embedded impedance converter.
Third medium antenna cover
The dielectric antenna housing is arranged on the rectangular reflection cavity, the interior of the antenna can be protected by the dielectric antenna housing, and the change of the multi-resonance-groove bowtie oscillator in a radiation impedance band in the reflection cavity is gentle through the thickness of a forehead cover body of the dielectric antenna housing and the adjustment of the distance between the dielectric antenna housing and the top surface of the multi-resonance-groove bowtie oscillator. The method specifically comprises the following steps: the distance between the inner top surface of the dielectric radome and the upper surface of the multi-resonant slot bowtie oscillator is selected to be 0.15 wavelength, and the wavelength is the wavelength of the high-end waveband of the resonant frequency.
Specific design parameters for the dielectric radome are as follows: the dielectric radome is made of a low-loss dielectric material with a dielectric constant of 3.5, the thickness of the dielectric radome is selected from a range of 0.05 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. A multi-resonant cavity-backed antenna, comprising: the multi-resonance groove bowtie vibrator comprises two vibrator monomers which are symmetrically arranged and are completely the same, and each vibrator monomer is a symmetric body;
end part resonance grooves are formed in the opposite side edges of the two vibrator units, the end part resonance grooves are located on the symmetrical middle lines of the vibrator units, and the notches of the end part resonance grooves are arranged in an opposite mode;
the opposite side edges of the two vibrator monomers are respectively provided with a long resonance groove and a short resonance groove, and the notches of any two opposite long resonance grooves and two opposite short resonance grooves on different vibrator monomers are oppositely arranged;
the grooving directions of the end part resonant groove, the long resonant groove and the short resonant groove are all arranged along the vibrator direction.
2. The multi-resonant excited cavity-backed antenna of claim 1, wherein the length of the multi-resonant slot bowtie oscillator is selected to be in the range of 0.25-0.3 wavelengths, the width of the multi-resonant slot bowtie oscillator is selected to be in the range of 0.15-0.2 wavelengths, and the thickness of the multi-resonant slot bowtie oscillator is selected to be in the range of 0.01-0.02 wavelengths, wherein the wavelengths are wavelengths in the lower band of the resonant frequency.
3. The multi-resonant cavity-backed antenna of claim 1, wherein the slot width of the end resonant slot is selected to be in the range of 0.02-0.04 wavelengths and the slot length is selected to be in the range of 0.05-0.1 wavelengths, wherein the wavelengths are wavelengths in the lower band of the resonant frequency.
4. The multi-resonance excitation cavity-backed antenna according to claim 1, wherein each of the long resonance grooves and each of the short resonance grooves on the same element are symmetrically arranged with respect to a symmetry line of the element, and the short resonance grooves and the long resonance grooves are sequentially arranged from the symmetry line to both sides.
5. The multi-resonant cavity-backed antenna of claim 4, wherein the slot widths of the long and short resonant slots are selected to be in the range of 0.004-0.007 wavelengths, the length of a single short resonant slot is selected to be in the range of 0.01-0.025 wavelengths, and the length of a single long resonant slot is selected to be in the range of 0.025-0.05 wavelengths, wherein the wavelengths are wavelengths in the lower end band of the resonant frequency.
6. The multi-resonant excited cavity-backed antenna of claim 1, further comprising:
the rectangular reflection cavity is used for containing the multi-resonance groove bowtie oscillator, the length-width ratio selection range of the rectangular reflection cavity is 1.05-1.25, the distance selection range between the multi-resonance groove bowtie oscillator and the bottom surface of the rectangular reflection cavity is 0.35-0.45 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonance frequency.
7. The multi-resonant excited cavity-backed antenna of claim 6, wherein the rectangular reflective cavity has a width selected in the range of 0.35 to 0.45 wavelengths in the lower band of the resonant frequency and a depth selected in the range of 0.5 to 0.55 wavelengths in the upper band of the resonant frequency.
8. The multi-resonant excited cavity-backed antenna of claim 6, wherein the rectangular reflector cavity is provided with an embedded impedance transformer for mounting the multi-resonant slot bowtie oscillator, and wherein an oscillating current is excited in the multi-resonant slot bowtie oscillator via the embedded impedance transformer.
9. The multi-resonant excited cavity-backed antenna of claim 1, further comprising:
and the distance between the inner top surface of the dielectric antenna housing and the upper surface of the multi-resonant groove bowtie vibrator is selected within the range of 0.1-0.15 wavelength, and the wavelength is the wavelength of a high-end waveband of the resonant frequency.
10. The multi-resonant excited back-cavity antenna according to claim 9, wherein the dielectric radome is made of a low-loss dielectric material with a dielectric constant of 3.0-3.5, and the dielectric radome has a thickness selected from a range of 0.025-0.05 wavelengths, wherein the wavelength is a wavelength of a high-end band of a resonant frequency.
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