CN209993723U - High-gain miniaturized helical antenna - Google Patents
High-gain miniaturized helical antenna Download PDFInfo
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- CN209993723U CN209993723U CN201921250717.6U CN201921250717U CN209993723U CN 209993723 U CN209993723 U CN 209993723U CN 201921250717 U CN201921250717 U CN 201921250717U CN 209993723 U CN209993723 U CN 209993723U
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Abstract
The utility model discloses a high-gain miniaturized helical antenna, which is externally connected with a coaxial feeder; the coaxial feeder comprises an inner conductor and an outer conductor; the spiral antenna comprises a spiral line with a conical structure, a first metal plate, a second metal plate and a coupling feed capacitor; the top of the second metal plate is connected with the bottom of the coupling feed capacitor; the top of the coupling feed capacitor is connected with the bottom of the first metal plate; the spiral line is connected with the top of the first metal plate; the second metal plate is provided with a first through hole, the coupling feed capacitor is provided with a second through hole, the inner conductor penetrates through the first through hole of the second metal plate and the second through hole of the coupling feed capacitor to be connected with the bottom of the first metal plate, and the radio-frequency signal is fed to the radiation unit through the coupling feed capacitor in an electromagnetic field coupling mode; the outer conductor is connected to the bottom of the second metal plate so that the second metal plate becomes a ground plate of the antenna.
Description
Technical Field
The utility model relates to an antenna technology field, more specifically relates to a miniaturized helical antenna of high gain.
Background
With the continuous development of wireless mobile communication, communication equipment has an increasing demand for omnidirectional radiation, high gain and miniaturized antennas, and among all omnidirectional radiation antenna types, a helical antenna radiating in a normal mode receives attention of researchers. The helical antenna can operate in an axial mode (directional radiation) and a normal mode (omnidirectional radiation), and the size limit range can be selected according to theoretical knowledge, so that the helical antenna operates in the normal mode. The radiator of the helical antenna is a metal wire with a helical shape and good conductivity, usually, the signal of the helical antenna is fed by a coaxial port, the inner conductor of the coaxial wire is directly connected with the helical wire conductor, and the outer conductor is connected with the ground plane. The spiral antenna has the advantages of simple structure, low manufacturing cost and omnidirectional radiation mode performance. The radiation direction of the helical antenna is related to the circumference of the helix, and when the circumference of the helix is much smaller than one wavelength, the direction with the strongest radiation is vertical to the helical axis; the strongest radiation occurs in the direction of the helix axis when the helix circumference is of the order of one wavelength. Aiming at the design, the normal mode helical antenna is adopted to realize omnidirectional radiation in the horizontal plane and low radiation in the normal direction of the grounding plate. The normal mode helical antenna basically meets the requirement of omnidirectional radiation, has small electric size and light weight, has electrical characteristics similar to those of a monopole antenna, and is widely applied to mobile communication. However, as society develops, production requirements demand that the helical antenna be miniaturized enough to be built in, and the size of the antenna be miniaturized, the high-gain radiation performance of the antenna be maintained, and the omnidirectional radiation pattern of the helical antenna cannot be changed, and in short, the helical antenna must be miniaturized highly, and the high-gain, high-efficiency, omnidirectional radiation must be maintained.
One prior art design, shown in FIG. 1, utilizes a loaded normal mode helixThe technology optimizes a huge population of antenna loading values, loading positions and related matching network parameters through a global optimization algorithm-a genetic algorithm combined with a moment method. The loading elements are lumped capacitors, lumped inductors and lumped resistors, the Sherman-Morrison-Woodbury formula is introduced to quickly solve the electrical characteristics of the antenna after the loading form is changed, the optimization efficiency is greatly improved, the size of the spiral antenna is miniaturized, and the height of the antenna is only 0.122 lambda0(λ0Vacuum wavelength). The loading mode is as follows: the helical antenna is cut into four sections, RLC lumped elements are loaded between each section, and the antenna is made to resonate at a prescribed resonant frequency by adjusting the values of the three RLC elements. The loading legend may refer to fig. 1. Loading 1: the loading height is 0.105m, and RLC parameters are 790.06 omega, 24.753nH and 0.5pF respectively; and (2) loading: the loading height is 0.165m, and the RLC parameters are 213.43 omega, 159.100nH and 0.6pF respectively; and (3) loading: the loading height is 0.280m, and the RLC parameters are 2036.00 omega, 404.540nH and 18.4pF respectively. The matching network is referred to in fig. 2.
The technology achieves the following aims: (1) the height dimension is only 0.122 of the vacuum wavelength, so that the height of the antenna is reduced by about 30%; (2) normal mode radiation is realized, and the impedance bandwidth is wide.
However, this method has the following disadvantages: (1) the height of the antenna still cannot meet the product requirement, and the market requirement is that the height is below 0.015 time of the vacuum wavelength of the resonant frequency; (2) the processing difficulty is high, because the loading mode is RLC loading, the spiral cutting processing and the RLC connection processing are required, the difficulty is very high, and the processing error is large.
In the second prior art, as shown in fig. 3, the structure adopts a technique of increasing the magnetic flux of the near field by adding a ferrite material in the middle of the helical antenna, and increasing the magnetic flux of the near field by loading the ferrite, thereby increasing the data transmission amount and stability. The purpose of loading ferrite in the spiral antenna coil is to make magnetic lines of force pass through the coil more intensively so as to increase the inductance of the coil and reduce the volume of the antenna so as to achieve the effect of miniaturization.
The second existing disadvantage of the prior art is as follows:
(1) selection of ferrite material parameters and their rigor; the experimental test becomes complicated after the ferrite is loaded, the parameters of the ferrite need to be further debugged, some test parameters and simulation parameters of the ferrite have access, the proper ferrite cannot be found, and the error is large.
(2) Before the impedance matching network is not connected, the return loss is large, but after the impedance matching network is added, the structure of the antenna is complicated, and the miniaturization of the spiral line is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an among the solution prior art antenna, can't keep the problem of the high gain of antenna when miniaturized with the antenna, provide a miniaturized helical antenna of high gain, it can satisfy the miniaturized while of antenna size simultaneously keeps the high gain radiation.
In order to realize the above, the utility model discloses the purpose, the technical scheme of adoption as follows: a high-gain miniaturized helical antenna externally connected with a coaxial feeder; the coaxial feeder comprises an inner conductor and an outer conductor; the spiral antenna comprises a spiral line with a conical structure, a first metal plate, a second metal plate and a coupling feed capacitor; the top of the second metal plate is connected with the bottom of the coupling feed capacitor; the top of the coupling feed capacitor is connected with the bottom of the first metal plate; the spiral line is connected with the top of the first metal plate; the second metal plate is provided with a first through hole, the coupling feed capacitor is provided with a second through hole, the inner conductor penetrates through the first through hole of the second metal plate and the second through hole of the coupling feed capacitor to be connected with the bottom of the first metal plate, and the radio-frequency signal is fed to the radiation unit through the coupling feed capacitor in an electromagnetic field coupling mode; the outer conductor is connected to the bottom of the second metal plate so that the second metal plate becomes a ground plate of the antenna.
Preferably, the helical line of the conical structure is gradually reduced in value from the outer diameter of the end close to the first metal plate to the outer diameter of the end far away from the first metal plate, and the wire diameter of the metal conductor adopted by the helical line is 1 mm.
Further, the outer diameter of the spiral line close to one end of the first metal plate is set to be 23mm, and the outer diameter of the spiral line far away from one end of the first metal plate is set to be 11.52 mm; the height of the spiral line is 10mm, and the number of turns is 3.94.
Preferably, the first metal plate is provided in a circular plate-like structure having a diameter of 27mm and a thickness of 0.035 mm.
Preferably, the coupling feed capacitor is provided as a circular plate-like structure with a corresponding diameter of 27mm and a thickness of 0.6 mm.
Further, the dielectric used for the coupling feed capacitor has a dielectric constant of 8.84 and a loss tangent of 0.002.
Preferably, the second metal plate is provided in a circular plate-like structure with a corresponding diameter of 60mm and a thickness of 1 mm.
Furthermore, the spiral line, the first metal plate and the second metal plate are made of metal iron materials.
Preferably, the coaxial feeder adopts a 50-ohm radio frequency coaxial connector, and the impedance of the input at the port of the coaxial feeder is 42.94-j × 2.34 ohm.
The utility model discloses the technique adopts novel coupling feed electric capacity structure innovatively, and to a great extent has realized the subminiaturization of antenna, carries out the reconfiguration to the helical structure of helix simultaneously, sets up its shape into the toper structure, can improve the radiation efficiency of antenna to a certain extent and guarantee the high-gain radiation of antenna, also can be used to antenna resonant frequency's fine setting simultaneously. Coupling feed electric capacity constitute by low dielectric constant dielectric, two metal sheets, can be in the same place with the fine coordination of helical structure, the effectual antenna installation degree of difficulty that has reduced to keep high efficiency radiation electromagnetic wave, the utility model discloses the technique realizes that helical antenna highly only is 0.015 times of vacuum wavelength, and actual gain also can reach 1.57dBi, guarantees horizontal direction omnidirectional radiation.
The utility model has the advantages as follows:
1. the utility model discloses the technique can directly adopt 50 ohm radio frequency coaxial connector, does not need plus impedance matching network, and the input impedance of its port department is 42.94-j 2.34 ohm, reduces except that the unnecessary additional structure of antenna, avoids matching network to the influence of radiation pattern to a certain extent, and its reflection loss is minimum.
3. The method that prior art realized compares the utility model discloses technical processing, equipment are complicated and dimensional error is great, and the additional network that introduces leads to the conductor loss higher, except the conductor loss, still include the field constraint of ferrite, load RLC's high loss, and the utility model discloses the technique has only increased a parallel plate electric capacity that comprises dielectric, two metal sheets of low dielectric constant at the feed port of helix, adopts the helix of tapered structure simultaneously, has realized under the prerequisite of miniaturization and normal mode radiation, can realize high efficiency, high gain radiation.
Drawings
Fig. 1 is an RLC lumped element loaded helical antenna, one of the prior art.
Fig. 2 is a feed network of an RLC lumped element loaded helical antenna, one of the prior art.
Fig. 3 is a ferrite loaded helical antenna of a second prior art.
Fig. 4 is a schematic structural diagram of the helical antenna according to this embodiment.
Fig. 5 is a partial sectional view of the structure in which the coaxial feed line is connected to the helical antenna according to the present embodiment.
Fig. 6 is an equivalent circuit diagram of the helical antenna according to the present embodiment.
Fig. 7 is a return loss S11 diagram of the present embodiment.
Fig. 8 is a standing wave ratio diagram of the present embodiment.
Fig. 9 is an impedance diagram of the present embodiment.
FIG. 10 is the directional diagram of the XOY plane and XOZ plane in this embodiment.
In the figure, 1-spiral line, 2-first metal plate, 3-coupling feed capacitor, 4-second metal plate, 5-coaxial feed line, 6-inner conductor and 7-outer conductor.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
In short-distance communication or radio station communication, the normal mode helical antenna plays an important role, can satisfy omnidirectional radiation in the horizontal direction, and is easy to process and manufacture, however, in the 460MHz low-frequency antenna, the antenna needs to be miniaturized and high-gain radiation is kept. Many researchers have studied the above problems for many years, but the prior art has miniaturized the antenna to a small extent, and has sacrificed gain, or added an impedance matching network, to increase the complexity and loss of the antenna system, thereby breaking away from the design requirement.
For convenience of explanation of the technical content of the present embodiment, the performance characteristics of the technique of the present embodiment are explained in detail by taking 460MHz radio station communication as an example. The 460MHz frequency corresponds to a vacuum wavelength of 652mm, half a wavelength of 326mm and a quarter wavelength of 163mm, all if the structural design of the original helical antenna is used, the antenna structure is too high.
The technical means of this embodiment will be described in detail below with the operating frequency of the helical antenna being 460MHz, specifically as follows:
as shown in fig. 4 and 5, a high-gain miniaturized helical antenna is externally connected with a coaxial feeder 5; the coaxial feed line 5 comprises an inner conductor 6 and an outer conductor 7; the spiral antenna comprises a spiral line 1 with a conical structure, a first metal plate 2, a second metal plate 4 and a coupling feed capacitor 3; the top of the second metal plate 4 is connected with the bottom of the coupling feed capacitor 3; the top of the coupling feed capacitor 3 is connected with the bottom of the first metal plate 2; the spiral line 1 is connected with the top of the first metal plate 2; the second metal plate 4 is provided with a first through hole, the coupling feed capacitor 3 is provided with a second through hole, the inner conductor 6 penetrates through the first through hole of the second metal plate 4 and the second through hole of the coupling feed capacitor 3 to be connected with the bottom of the first metal plate 2, and the radio-frequency signals are fed to the radiation unit through the coupling feed capacitor 3 in an electromagnetic field coupling mode; the outer conductor 7 is connected to the bottom of the second metal plate 4 so that the second metal plate 4 becomes the ground plane of the antenna.
The high-gain miniaturized helical antenna is externally connected with a coaxial feeder; the coaxial feeder comprises an inner conductor and an outer conductor; the spiral antenna comprises a spiral line with a conical structure, a first metal plate, a second metal plate and a coupling feed capacitor; the top of the second metal plate is connected with the bottom of the coupling feed capacitor; the top of the coupling feed capacitor is connected with the bottom of the first metal plate; the spiral line is connected with the top of the first metal plate; the second metal plate is provided with a first through hole, the coupling feed capacitor is provided with a second through hole, the inner conductor penetrates through the first through hole of the second metal plate and the second through hole of the coupling feed capacitor to be connected with the bottom of the first metal plate, and the radio-frequency signal is fed to the radiation unit through the coupling feed capacitor in an electromagnetic field coupling mode; the outer conductor is connected with the bottom of the second metal plate, so that the second metal plate becomes a grounding plate of the antenna
This embodiment the setting of helix 1 of tapered structure is close to the external diameter L of the one end of first metal sheet 2 to keeping away from the external diameter of the one end of first metal sheet 2 and is equivalent to diminish gradually, the metallic conductor line diameter that helix 1 adopted is 1 mm. In the embodiment, the outer diameter L of the spiral line 1 close to one end of the first metal plate 2 is 23mm, and the outer diameter of the spiral line 1 far away from one end of the first metal plate 2 is 11.52 mm; the height of the spiral line 1 is 10mm, and the number of turns is 3.94. The utility model discloses a helix of tapered structure can improve the radiation efficiency of antenna to a certain extent and guarantee the high-gain radiation of antenna, also can be used to antenna resonant frequency's fine setting simultaneously.
The first metal plate 2 according to the present embodiment is provided in a circular plate-like structure having a diameter of 27mm and a thickness of 0.035 mm. The coupling feed capacitor 3 is set to be a circular plate-shaped structure, the corresponding diameter of the coupling feed capacitor 3 is 27mm, the thickness of the coupling feed capacitor is 0.6mm, and a second through hole is formed in the circle center of the coupling feed capacitor 3. The dielectric material used for the coupling feed capacitor 3 has a dielectric constant of 8.84 and a loss tangent of 0.002. The second metal plate 4 is of a circular plate-shaped structure, the corresponding diameter of the second metal plate is 60mm, the thickness of the second metal plate is 1mm, and a first through hole is formed in the circle center of the second metal plate 4. The spiral line 1, the first metal plate 2 and the second metal plate 4 are made of metal iron materials.
The coaxial feeder 5 adopts a 50-ohm radio frequency coaxial connector, and the impedance of the input at the port of the coaxial feeder is 42.94-j × 2.34 ohm.
As shown in fig. 5, it can be seen that the outer conductor 7 is directly connected, i.e. electrically connected, to the second metal plate 4, and the second metal plate 4 is provided as a ground plate of the antenna, i.e. the second metal plate 4 becomes a reflector plate of the helical antenna 1. The inner conductor 6 passes through the coupling feed capacitor 3 and is directly and electrically connected with the first metal plate 2, so that the radio-frequency signal is fed to the radiating unit through the coupling feed capacitor 3 in an electromagnetic field coupling mode.
FIG. 6 is an equivalent circuit diagram of the helical antenna 1 according to the present embodiment, in which a capacitor C1The capacitance value of the coupling feed capacitor 3 is shown, and the coupling feed capacitor 3 can be seen to be connected with the equivalent circuit in parallel, and the capacitance value is relatively large, which explains why the antenna can be miniaturized, and Co、Lo、R0Is an equivalent circuit of a spiral line. The resonant frequency can be known from the theoretical knowledge of the low-frequency circuit
Therefore, as can be seen from the equivalent circuit diagram, by increasing the capacitance C in the equation, the inductance L of the spiral line should be decreased correspondingly under the condition of ensuring that the frequency f is not changed, that is, the height of the spiral line can be decreased, thereby achieving the purpose of miniaturization. The structure of the helical line 1 described in this embodiment is not a general helical line, but a tapered helical line is designed through a specific structure, so as to ensure that the antenna realizes microminiaturization and simultaneously ensures high gain in the horizontal omnidirectional radiation direction.
The working frequency of the spiral antenna designed by the present example is 460MHz, the spiral antenna works in an ultrahigh frequency UHF frequency band, the polarization mode of the structure at a resonance frequency point is linear polarization, the feeding mode is a standard 50 ohm coaxial line feeding mode, and the coaxial line comprises an inner conductor and an outer conductor.
The technology of the embodiment is applied to the design of a 460MHz spiral antenna, the height of the whole size of the antenna is 0.015 times of the vacuum wavelength of the resonant frequency (the absolute size is 10mm), the omnidirectional radiation of the spiral antenna is met, the maximum gain is 1.57dBi, the gain is generally higher than that of the prior art, and the degree of size miniaturization is higher than that of the prior art. The working frequency of the helical antenna in the embodiment is 460MHz, the miniaturization and high gain of the omnidirectional radiation antenna are realized by adopting a novel capacitance loading technology and a novel helical line structure, the radiation efficiency is maintained above 90%, and omnidirectional radiation is realized on a horizontal plane, so that the design requirement of social production of the high-gain microminiaturized helical antenna is met.
The return loss S11 parameter of the helical antenna described in this embodiment is shown in fig. 7, and it can be seen from the figure that, at the resonant frequency of 460MHz, the value of S11 is-22.427 dB, the return loss reaches the minimum value, it can be basically considered that the channel has no reflected wave, and all energy enters the radiator, the same conclusion can be obtained from fig. 8, and the standing-wave ratio of the input port of the helical antenna is 1.16dB, so it is basically considered that the input port of the antenna can be directly connected with the coaxial line of 50 ohms without reflection, fig. 9 shows the impedance curve of the input port, and the impedance value at the resonant frequency is 42.94-j × 2.34 ohms, which further illustrates that the feed port can be directly connected with the coaxial port of 50 ohms without reflection. Fig. 10 is the XOY and XOZ plane patterns at 460MHz resonance, and it can be seen that the antenna meets the characteristics of omnidirectional radiation in the horizontal direction, while the maximum gain in the horizontal direction is seen to be 1.57 dBi.
The helical antenna described in this embodiment can refer to the directional pattern of fig. 10 on the basis of ensuring that the helical antenna operates in the normal mode, that is, the directional pattern of the antenna must have the minimum gain in the vertical direction of the ground plane and the maximum gain in the horizontal plane parallel to the ground plane. The helical antenna is miniaturized to a great extent by innovatively applying a novel coupling feed capacitor structure, the height of the helical antenna is only 0.015 time (namely 10mm) of the vacuum wavelength of the resonant frequency, and meanwhile, the helical structure innovatively adopts a conical structure to realize high-gain radiation.
Compared with the prior art, the implementation has the following characteristics:
(1) only a novel coupling feed capacitor structure is adopted; that is, the design is not as complicated as the RLC element segment loading required by the technique in one of the prior art, simplifying the structure of the helical antenna.
(2) The loaded capacitor is not a lumped element, and is formed by directly adopting a low-dielectric-constant dielectric medium and two metal conductor plates, because the mode is easy to process, has higher mechanical property and practicability and can be well fused and processed with a spiral structure in the practical production and processing.
(3) The utility model discloses a capacitance loading can realize that helical antenna's high decline is 0.015 times of resonant frequency vacuum wavelength, and is better than the miniaturized effect that above-mentioned technique realized.
(4) The exemplary embodiment of the present invention, that is, the 460MHz omnidirectional radiation helical antenna, can achieve a maximum gain of 1.57dBi in the horizontal radiation direction at the resonant frequency under the premise of satisfying the normal mode radiation and the microminiaturization.
(5) An external impedance matching network is not needed; the helical antenna in the utility model has the standing-wave ratio of only 1.16dB at the position of the resonance frequency of 460MHz, and can see that if the antenna is connected with a 50 ohm coaxial transmission line, the reflection loss is very low, and no reflected wave can be considered basically; and an additional impedance matching network is not needed, and the redundancy of an external circuit of the antenna is reduced.
(6) If the loss of the loaded RLC lumped element in the prior art is too large (especially, the loaded resistor consumes too much energy) compared with the present embodiment, the radiation efficiency is relatively low compared with the present embodiment.
The technical differences between the present embodiment and the prior art are as follows:
(1) the present embodiment does not require ferrites; because of the difficulty in finding ferrite materials and the difficulty in making ferrite parameters in simulation and actual manufacturing, the method has small errors.
(2) The embodiment has compact structure; the reason is that ferrite does not need to be loaded, a novel coupling feed capacitor structure is only needed to be added at a feed port, and then the structural design of the conical variable pitch is carried out on a spiral antenna radiator, so that the structure is easy to fix and install.
(4) The helical antenna described in this embodiment does not need an additional impedance matching network because the utility model discloses the technique can make the input impedance of the feed port of helical antenna 42.94-j 2.34 ohms, can directly link to each other with the SMA coaxial interface, and return loss is very little, does not need impedance conversion.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A high-gain miniaturized helical antenna externally connected with a coaxial feeder; the coaxial feeder comprises an inner conductor and an outer conductor; the method is characterized in that: the spiral antenna comprises a spiral line with a conical structure, a first metal plate, a second metal plate and a coupling feed capacitor; the top of the second metal plate is connected with the bottom of the coupling feed capacitor; the top of the coupling feed capacitor is connected with the bottom of the first metal plate; the spiral line is connected with the top of the first metal plate; the second metal plate is provided with a first through hole, the coupling feed capacitor is provided with a second through hole, the inner conductor penetrates through the first through hole of the second metal plate and the second through hole of the coupling feed capacitor to be connected with the bottom of the first metal plate, and the radio-frequency signal is fed to the radiation unit through the coupling feed capacitor in an electromagnetic field coupling mode; the outer conductor is connected to the bottom of the second metal plate so that the second metal plate becomes a ground plate of the antenna.
2. A high gain miniaturized helical antenna according to claim 1, wherein: the outer diameter of the end, close to the first metal plate, of the spiral line of the conical structure is gradually reduced in value along the outer diameter of the end, far away from the first metal plate, of the end, and the wire diameter of the metal conductor adopted by the spiral line is 1 mm.
3. A high gain miniaturized helical antenna according to claim 2, wherein: setting the outer diameter of the spiral line close to one end of the first metal plate to be 23mm, and setting the outer diameter of the spiral line far away from one end of the first metal plate to be 11.52 mm; the height of the spiral line is 10mm, and the number of turns is 3.94.
4. A high gain miniaturized helical antenna according to claim 1, wherein: the first metal plate is arranged to be a circular plate-shaped structure, the diameter of the first metal plate is 27mm, and the thickness of the first metal plate is 0.035 mm.
5. A high gain miniaturized helical antenna according to claim 1, wherein: the coupling feed capacitor is arranged to be a circular plate-shaped structure, the corresponding diameter of the coupling feed capacitor is 27mm, and the thickness of the coupling feed capacitor is 0.6 mm.
6. A high-gain miniaturized helical antenna according to claim 5, wherein: the dielectric medium adopted by the coupling feed capacitor has a dielectric constant of 8.84 and a loss tangent value of 0.002.
7. A high gain miniaturized helical antenna according to claim 1, wherein: the second metal plate is arranged to be a circular plate-shaped structure, the corresponding diameter of the second metal plate is 60mm, and the thickness of the second metal plate is 1 mm.
8. A high-gain miniaturized helical antenna according to any one of claims 2 to 7, wherein: the spiral line, the first metal plate and the second metal plate are all made of metal iron materials.
9. A high gain miniaturized helical antenna according to claim 1, wherein: the coaxial feeder adopts a 50-ohm radio frequency coaxial connector, and the impedance of the input at the port of the coaxial feeder is 42.94-j × 2.34 ohm.
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| CN110600865A (en) * | 2019-08-02 | 2019-12-20 | 广东工业大学 | High-gain miniaturized helical antenna |
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