CN211789501U - VHF and UHF frequency channel antenna - Google Patents
VHF and UHF frequency channel antenna Download PDFInfo
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- CN211789501U CN211789501U CN202020386218.6U CN202020386218U CN211789501U CN 211789501 U CN211789501 U CN 211789501U CN 202020386218 U CN202020386218 U CN 202020386218U CN 211789501 U CN211789501 U CN 211789501U
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Abstract
The embodiment of the utility model provides a VHF and UHF frequency channel antenna, it includes: the radiator comprises a conductive floor, a top loading plate and a radiator body. The top loading plate and the conductive floor are arranged face to face, and the radiator is connected between the top loading plate and the conductive floor. At least two short circuit conducting strips also connected between the top loading plate and the conducting floor. Wherein, at least one gap is respectively arranged on each side of the two sides of the radiator. The VHF and UHF frequency band antenna realizes the miniaturization and the broadband of the antenna, has higher gain and good radiation pattern, and can be used for an airborne VHF/UHF communication system.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an antenna technology field especially relates to a VHF and UHF frequency channel antenna.
[ background of the invention ]
The monopole antenna has excellent radiation performance as an omnidirectional antenna, and is widely used in many communication devices. Various monopole antennas are equipped on ground radio stations, vehicle radio stations, individual soldier backpacks, ships and airplanes. In the VHF/UHF band, the size of the omnidirectional monopole antenna is generally large, which is not beneficial to the antenna installation and concealment, and the airborne knife antenna is also limited by its aerodynamic shape, so that the monopole antenna needs to be miniaturized in broadband. The existing monopole antenna is difficult to simultaneously meet the requirements of broadband, miniaturization and high gain.
[ Utility model ] content
In view of the above problems, an object of the present invention is to provide a VHF and UHF band antenna, which improves the impedance matching effect of the VHF and UHF band antennas and realizes the miniaturization, the broadband, and the high-gain design of the VHF and UHF band antennas.
The embodiment of the utility model provides a VHF and UHF frequency channel antenna, it includes:
a conductive floor;
the top loading plate is arranged opposite to the conductive floor;
the radiator is connected between the top loading plate and the conductive floor;
at least two short circuit conducting strips also connected between the top loading plate and the conducting floor;
wherein, at least one gap is respectively arranged on each side of the two sides of the radiator.
Preferably, the at least two short circuit conducting strips are respectively arranged on the front side and the rear side of the radiator, and the at least two short circuit conducting strips are parallel to the radiator.
Preferably, the VHF and UHF band antenna further comprises: at least two coupling tabs located between and connected to the top load plate and the conductive floor; the at least two coupling pieces are respectively arranged on the left side and the right side of the radiator, and the at least two coupling pieces are perpendicular to the radiator.
Preferably, the at least two coupling pieces completely cover the at least one slot on both sides of the radiator on the side surfaces of the VHF and UHF band antennas.
Preferably, each of the at least two coupling pieces is rectangular, and each of the at least two short circuit conducting pieces is rectangular.
Preferably, in a top view plane of the VHF and UHF band antennas, the top loading plate completely covers the at least two short circuit conducting plates and the at least two coupling plates.
Preferably, the at least two short circuit conducting strips are arranged in axial symmetry along the symmetry axis of the radiator, and the at least two coupling strips are arranged in axial symmetry along the symmetry axis of the radiator.
Preferably, the top end of the radiator is provided with a protruding part, and the protruding part is connected with the top loading plate;
the width of each short circuit conducting strip of the at least two short circuit conducting strips is smaller than the length of the lug boss.
Preferably, the bottom end of the radiator is provided with a gradual change part, and the gradual change part is connected with the conductive floor; the length of one end, close to the conductive floor, of the gradual change portion is smaller than that of one end, far away from the conductive floor, of the gradual change portion.
Preferably, the VHF and UHF band antenna further comprises: the inductor comprises a first capacitor, a first inductor, a second capacitor, a third inductor, a third capacitor and a fourth inductor;
the first capacitor, the first inductor, the second inductor and the second capacitor are sequentially connected in series between the coaxial port and feed points of the VHF and UHF frequency band antennas; the third inductor is connected between the connection point of the first capacitor and the first inductor and the ground; the third capacitor is connected between the connection point of the first inductor and the second inductor and the ground; the fourth inductor is connected between a connection point of the second capacitor and the feeding point and ground.
The utility model provides a VHF and UHF frequency channel antenna includes conductive floor, top loading plate and connects the irradiator between conductive floor and top loading plate to and connect two at least short circuit conducting strips between top loading plate and conductive floor, wherein, every side of the both sides of irradiator all is provided with at least one gap. The utility model discloses a design in VHF and UHF frequency channel antenna's short circuit conducting strip and gap can extend the antenna bandwidth under the limit of take the altitude, optimizes the impedance matching effect of antenna, has reduced the height of antenna, has realized the miniaturized design of VHF and UHF frequency channel antenna.
The coupling sheet is arranged on the conductive floor, so that the performance of the antenna is further optimized, and the height of the antenna is reduced.
The height of the rectangular gaps on the two sides of the radiator is within the high coverage range of the coupling sheet, so that the space radiation of the antenna can be optimized, and the radiation efficiency of the antenna is improved.
The bottom end of the antenna is provided with a gradual change part, so that the bandwidth of the antenna can be further expanded.
A broadband matching network is arranged between the coaxial port and the feed point, so that the impedance matching effect can be optimized, the voltage standing wave ratio is reduced, and the antenna performance is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 shows a schematic perspective view of VHF and UHF band antennas according to an embodiment of the present invention;
fig. 2 shows a front view of a VHF and UHF band antenna according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a matching network structure of VHF and UHF band antennas according to an embodiment of the present invention;
fig. 4A shows the voltage standing wave ratio of VHF and UHF band antennas according to an embodiment of the invention without the matching network shown in fig. 3;
fig. 4B shows the voltage standing wave ratio of the VHF and UHF band antennas loaded with the matching network shown in fig. 3 according to an embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 shows a schematic perspective view of VHF and UHF band antennas according to an embodiment of the present invention. Fig. 2 shows a schematic front view structure diagram of VHF and UHF band antennas according to an embodiment of the present invention. Wherein, the Z-axis direction is the length direction, the X-axis direction is the width direction, and the Y-axis direction is the height direction.
The utility model discloses VHF and UHF frequency channel antenna includes conductive floor 1, irradiator 2, top loading plate 3, coupling piece 4, two at least short circuit conducting strip 5 and feed point 21. The conductive floor 1, the radiator 2, the top loading plate 3, the coupling sheet 4 and the short circuit conductive sheet 5 are all conductive plate-shaped structures. Preferably, the radiator 2, the top loading plate 3, the coupling tab 4 and the short circuit conducting tab 5 are all metal structures.
The conductive floor 1 is disposed to face the top loading plate 3. Specifically, the conductive floor 1 is disposed in parallel with the top loading plate 3. The radiator 2 is connected between the top loading plate 3 and the conductive floor 1. Specifically, the radiator 2 is vertically connected between the top load plate 3 and the conductive floor 1. The feed point 21 is located at the bottom end of the radiator 2, passes through the conductive floor 1 and is connected with the coaxial port, and the top end of the radiator 2 is connected with the top loading plate 3. And the radiating body 2 is preferably in a left-right symmetrical structure, the design elements of the symmetrical structure are easy to realize, and the regular physical structure is convenient for theoretical calculation and analysis. The feeding point 21 is preferably disposed on the bilateral symmetry axis of the bilateral symmetry radiator 2, which is beneficial to the impedance matching in all directions, so that the VHF and UHF band antennas have good all-directional gain.
At least one slot 22 is formed on each of two sides of the radiator 2. At least two short circuit conducting strips 5 are also connected between the top loading plate 3 and the conductive floor 1. Specifically, the at least two short circuit conducting strips 5 are respectively disposed on the front side and the rear side of the radiator 2, and the at least two short circuit conducting strips 5 are parallel to the radiator 2.
Further, the VHF and UHF band antennas also include at least two coupling patches 4. At least two coupling pieces 4 positioned between the top loading plate 3 and the conductive floor 1 and connected to the conductive floor 1; at least two coupling tabs 4 are respectively arranged at the left side and the right side of the radiator 2, and the at least two coupling tabs 4 are perpendicular to the radiator 2. Specifically, neither of the at least two coupling tabs 4 is connected to the top loading plate 3.
In the present embodiment, the at least two short circuit conducting strips 5 are disposed in axial symmetry along the symmetry axis of the radiator 2, and the at least two coupling strips 4 are disposed in axial symmetry along the symmetry axis of the radiator 2.
The radiator 2 has a boss 23 at a top end thereof, and the boss 23 is connected to the top load plate 3. The width of each of the at least two shorting conductive strips 5 is less than the length of the boss 23.
The length of the protrusion 23 is greater than the length of the slit 22, and the width of the slit 22 is greater than the width of the protrusion 23 (or referred to as the height of the protrusion 23).
The bottom end of the radiator 2 is provided with a gradual change part, and the gradual change part is connected with the conductive floor 1; the length of one end of the gradual change part close to the conductive floor board 1 is smaller than that of one end of the gradual change part far away from the conductive floor board 1. In an alternative embodiment, the transition portion may be optionally trapezoidal in shape.
The gradual change portion may also be designed as a triangle, and one end of the gradual change portion close to the conductive floor 1 is provided with a feeding point to receive feeding information, and the gradual change portion is preferably an isosceles trapezoid or an equilateral triangle, which may improve the radiation effect of the radiator 2.
Specifically, the number of the slots 22 is two, that is, two slots 22 are respectively formed on two sides of the radiator 2, and the two slots 22 are rectangular.
The slits 22 and the protrusions 23 are preferably designed to be rectangular, so that the impedance matching effect is good, and the production and the manufacture are convenient. The slits 22 are not limited to a pair, nor to a rectangular shape, for example, designed as a fan or a triangle. In this embodiment, the slot 22 is located at the middle in the up-down direction, so that the impedance matching effect is good, and the slot may be designed to be deviated from the middle and be close to the upper end or the lower end. The protruding portion 23 is connected to the top loading plate 3, and the width of the protruding portion 23 (or referred to as the height of the protruding portion 23) that plays a role in connecting the radiator 2 and the top loading plate 3 is smaller than the overall height of the radiator 2, so that the impedance matching effect is better.
Specifically, the number of the at least two coupling tabs 4 is two, and the two coupling tabs 4 are respectively located at the left and right sides of the radiator 2 and are both connected to the conductive floor 1. Preferably, the antenna is of a symmetrical structure, and is perpendicular to both the radiator 2 and the conductive floor 1, and in the Z-axis direction, i.e. the side surface of the antenna, the coupling sheet 4 completely covers the slot 22, i.e. the height of the top end of the coupling sheet 4 is greater than the height of the top end of the slot 22; meanwhile, the protruding portion 23 of the radiator 2 is completely exposed on the side surfaces of the VHF and UHF band antennas; the space radiation effect can be optimized, and the antenna performance is improved.
Specifically, the number of the at least two short circuit conductive sheets 5 is two, and each short circuit conductive sheet 5 is preferably arranged at the middle position of the radiator 2 in a matching manner, is parallel to the radiator 2, and is connected between the top loading plate 3 and the conductive floor 1. In the VHF and UHF band antennas of the present embodiment, the short conductive sheet 5 is rectangular in shape.
The utility model discloses the length of the top load plate 3 of VHF and UHF frequency channel antenna is 0.18 lambda, and the width is 0.073 lambda, and wherein, the whole height of VHF and UHF frequency channel antenna is 0.09 lambda, and the lambda is the wavelength of the lowest frequency electromagnetic wave of VHF and UHF frequency channel antenna.
The center of the conductive floor 1 is provided with a through hole, a feed point 21 is connected with a coaxial port through the through hole to receive feed, the coupling sheets 4 are arranged at the left side and the right side of the radiator 2, the number of the short circuit conducting sheets 5 is two, the two short circuit conducting sheets are symmetrically arranged at the front side and the rear side of the radiator 2 and are not in contact with the radiator 2 to form a similar sleeve structure, and the top loading plate 3 is oval and can be designed to be round or square. The coupling sheet 4 and the short circuit conducting sheet 5 are rectangular and stand on the conductive floor 1, the short circuit conducting sheet 5 is connected between the conductive floor 1 and the top loading plate 3, the bandwidth of the antenna can be expanded, the width of the top loading plate 3 in the X-axis direction is reduced, the coupling sheet 4 is only connected with the conductive floor 1, the bandwidth of the antenna can be expanded, and the height of the antenna can be reduced. The widths of the coupling tab 4 and any one of the short circuit conducting tabs 5 are smaller than or equal to the size of the corresponding area of the top loading plate 3, that is, when viewed from the top (i.e., top view), the top loading plate 3 completely covers or shields the two coupling tabs 4 and the two short circuit conducting tabs 5, and when viewed from the top, only the top loading plate 3 can be seen, without any coupling tabs 4 and short circuit conducting tabs 5 exposing the size range of the top loading plate 3.
Each structure of the antenna is preferably a centrosymmetric structure in a plane view with respect to the center through hole of the conductive floor 1.
The short circuit conductive strips 5 are designed as a pair, and may be designed as a plurality of pairs, which are symmetrically arranged with respect to the left-right symmetry axis of the radiator 2. The conductive floor 1 may be rectangular, polygonal, oval or circular, the dimensions of which are conventionally chosen to be larger than the dimensions of the top load plate 3. The top loading plate 3 may be elliptical, rectangular or polygonal, and may preferably be elliptical to match the radiator 2.
Fig. 3 shows a schematic diagram of a broadband matching network of VHF and UHF band antennas according to an embodiment of the present invention. The broadband matching network comprises a first capacitor C1, a first inductor L1, a second inductor L2, a second capacitor C2, a third inductor L3, a third capacitor C3 and a fourth inductor L4. The first capacitor C1, the first inductor L1, the second inductor L2 and the second capacitor C2 are sequentially connected IN series between the coaxial port IN and the feeding point 21 of the VHF and UHF frequency band antenna; the third inductor L3 is connected between the connection point of the first capacitor C1 and the first inductor L1 and ground; the third capacitor C3 is connected between the connection point of the first inductor L1 and the second inductor L2 and the ground; the fourth inductor L4 is connected between the connection of the second capacitor C2 and the feeding point 21 and ground.
IN this embodiment, the coaxial port IN is a 50-ohm coaxial port, the capacitor C1 is 25.8844pF (pico farad), the inductor L1 is 12.9478nH (nanohenry), the inductor L2 is 53.8626nH, the capacitor C2 is 6.16959pF, the inductor L3 is 6.8315nH, the capacitor C3 is 7.07228pF, and the inductor L4 is 9.4896 nH.
Fig. 4A shows the voltage standing wave ratio of VHF and UHF band antennas according to an embodiment of the invention without the broadband matching network shown in fig. 3. The abscissa is the frequency, and the ordinate is voltage standing wave ratio, and wherein, flow does the utility model discloses the lowest frequency point of VHF and UHF frequency channel antenna, fhigh does the utility model discloses the highest frequency point of VHF and UHF frequency channel antenna, f1 to f6 are six frequency points in the middle of, point 1(flow, 11.033), point 2(fhigh,2.0207). The utility model discloses VHF and UHF frequency channel antenna do not load the voltage standing wave ratio of the broadband matching network shown in figure 3 and reach 11.033 at the voltage standing wave ratio of low frequency band, and low frequency impedance matching effect is extremely poor, and the voltage standing wave ratio at f1 to f6 frequency channel all is less than 2, and the voltage standing wave ratio of high frequency point fhigh is 2.0207, and the impedance matching effect of high frequency point is better.
Fig. 4B shows the voltage standing wave ratio of the VHF and UHF band antennas loaded with the broadband matching network shown in fig. 3 according to an embodiment of the present invention. Frequency point 1 (f)low2.6223), frequency point 2 (f)high1.8684), each frequency point is the same as the frequency point marked in fig. 4A, the utility model discloses the low frequency point f after VHF and UHF frequency band antenna loaded the broadband matching network shown in fig. 3lowThe voltage standing wave ratio of (2) is reduced to 2.6223<3, the full frequency band bandwidth range of the antenna is flowTo fhighThe voltage standing wave ratio of the transformer is less than 3 on the whole, and the engineering requirements are met.
Wherein, in the verification test that eight frequency points's of the VHF and UHF frequency channel antenna of the utility model discloses in the H face (theta be 90) radiation pattern goes on. Corresponds to flow、f1、f2、f3、f4、 f5、f6、fhighAnd (4) frequency points.
flowThe main lobe gain of the frequency point is-0.415 dB, and the main lobe direction is 90.0 degrees.
The main lobe gain of the f1 frequency point is-1.07 dB, and the main lobe direction is 90.0 degrees.
The main lobe gain of the frequency point of f2 is-1.52 dB, and the main lobe direction is-29.0 degrees.
The main lobe gain of the frequency point of f3 is-2.27 dB, and the main lobe direction is 178.0 degrees.
The main lobe gain of the f4 frequency point is-1.59 dB, and the main lobe direction is 0.0 degree.
The main lobe gain of the f5 frequency point is-0.388 dB, and the main lobe direction is-9.0 degrees.
The main lobe gain of the frequency point of f6 is 0.437dB, the main lobe direction is-178 degrees, and the 3dB beam width is 124.3 degrees.
fhighThe main lobe gain of the frequency point is 0.907dB, the main lobe direction is 180 degrees, the 3dB beam width is 78.6dB, and the side lobe gain is-3.6 dB.
The result shows that the VHF and UHF band antennas of the present invention have better full band gain and better omni-directionality after loading the broadband matching network shown in fig. 3.
The utility model discloses a VHF and UHF frequency channel antenna design short circuit conducting strip reduces the width of top load plate, and the irradiator side sets up the gap (for example rectangle gap) simultaneously, expands antenna bandwidth, optimizes impedance match, reduces antenna size; designing a top loading plate to expand the bandwidth of the antenna and reduce the height of the antenna; the coupling sheet is designed to be used as a grounding column, so that the antenna bandwidth is expanded, and the antenna height is reduced; a broadband matching network is loaded between the feed point and the 50-ohm coaxial port, so that impedance is optimized, the voltage standing wave ratio of low frequency points is effectively reduced, and the bandwidth of the antenna is expanded. The whole structure is simple, the length, the width and the height of the antenna are (0.18 lambda, 0.073 lambda and 0.09 lambda), the lambda is the wavelength of electromagnetic waves with the lowest frequency of the antenna, the whole size is small, the antenna is in accordance with the design of a miniaturized antenna, the full-band voltage standing wave ratio is less than 3, the impedance matching effect is good, the omnidirectional gain is good, and the performance of the VHF and UHF frequency band antenna is excellent.
The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. A VHF and UHF band antenna, comprising:
a conductive floor;
the top loading plate is arranged opposite to the conductive floor;
the radiator is connected between the top loading plate and the conductive floor;
at least two short circuit conducting strips also connected between the top loading plate and the conducting floor;
wherein, at least one gap is respectively arranged on each side of the two sides of the radiator.
2. The VHF and UHF band antenna of claim 1, wherein: the at least two short circuit conducting strips are respectively arranged on the front side and the rear side of the radiator, and the at least two short circuit conducting strips are parallel to the radiator.
3. The VHF and UHF band antenna of claim 1, further comprising:
at least two coupling tabs located between and connected to the top load plate and the conductive floor; the at least two coupling pieces are respectively arranged on the left side and the right side of the radiator, and the at least two coupling pieces are perpendicular to the radiator.
4. The VHF and UHF band antenna of claim 3, wherein: on the side of the VHF and UHF band antennas, the at least two coupling tabs completely cover the at least one slot on both sides of the radiator.
5. The VHF and UHF band antenna of claim 3, wherein: each coupling piece of the at least two coupling pieces is rectangular, and each short circuit conducting piece of the at least two short circuit conducting pieces is rectangular.
6. The VHF and UHF band antenna of claim 3, wherein: and on the top view surface of the VHF and UHF frequency band antenna, the top loading plate completely covers the at least two short circuit conducting strips and the at least two coupling strips.
7. The VHF and UHF band antenna of claim 3, wherein: the at least two short circuit conducting strips are arranged in an axial symmetry mode along the symmetry axis of the radiator, and the at least two coupling strips are arranged in an axial symmetry mode along the symmetry axis of the radiator.
8. The VHF and UHF band antenna of claim 1, wherein: the top end of the radiator is provided with a protruding part, and the protruding part is connected with the top loading plate;
the width of each short circuit conducting strip of the at least two short circuit conducting strips is smaller than the length of the lug boss.
9. The VHF and UHF band antenna of claim 1, wherein: the bottom end of the radiator is provided with a gradual change part, and the gradual change part is connected with the conductive floor; the length of one end, close to the conductive floor, of the gradual change portion is smaller than that of one end, far away from the conductive floor, of the gradual change portion.
10. The VHF and UHF band antenna of claim 1, further comprising: the inductor comprises a first capacitor, a first inductor, a second capacitor, a third inductor, a third capacitor and a fourth inductor;
the first capacitor, the first inductor, the second inductor and the second capacitor are sequentially connected in series between the coaxial port and feed points of the VHF and UHF frequency band antennas; the third inductor is connected between the connection point of the first capacitor and the first inductor and the ground; the third capacitor is connected between the connection point of the first inductor and the second inductor and the ground; the fourth inductor is connected between a connection point of the second capacitor and the feeding point and ground.
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| CN202020386218.6U CN211789501U (en) | 2020-03-24 | 2020-03-24 | VHF and UHF frequency channel antenna |
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| CN202020386218.6U CN211789501U (en) | 2020-03-24 | 2020-03-24 | VHF and UHF frequency channel antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571912A (en) * | 2021-06-21 | 2021-10-29 | 西安电子科技大学 | Airborne ultrashort wave antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571912A (en) * | 2021-06-21 | 2021-10-29 | 西安电子科技大学 | Airborne ultrashort wave antenna |
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