CN212968048U - Wide-bandwidth beam forming measurement and control antenna - Google Patents
Wide-bandwidth beam forming measurement and control antenna Download PDFInfo
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- CN212968048U CN212968048U CN202022398004.3U CN202022398004U CN212968048U CN 212968048 U CN212968048 U CN 212968048U CN 202022398004 U CN202022398004 U CN 202022398004U CN 212968048 U CN212968048 U CN 212968048U
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Abstract
The utility model provides a wide bandwidth beam forming observes and controls antenna belongs to antenna technical field, can solve the current too high of antenna center gain margin, the not enough problem of marginal link gain allowance. The conical cylinder of the wide bandwidth beam forming measurement and control antenna comprises a hollow inner cavity, and a feed PCB is axially arranged in the inner cavity along the conical cylinder; one side of the feed PCB is provided with a balun and a feed microstrip line in sequence from the top end to the bottom end, and the other side is provided with a metal layer; the bottom end of the feed microstrip line is connected with the feed port; one end of the first antenna radiation arm is connected with the top end of the feed microstrip line through a balun; one end of the second antenna radiation arm is connected with the metal layer; the first antenna radiation arm and the second antenna radiation arm are spirally arranged on the outer wall of the conical cylinder, and the rotation directions are the same. The utility model discloses can compensate the antenna because of the too high and marginal link gain surplus of the central gain margin that the earth near-far effect leads to is not enough.
Description
Technical Field
The utility model relates to the technical field of antennas, especially, relate to a wide bandwidth beam forming observes and controls antenna.
Background
With the development of modern wireless communication industry, satellite communication systems play an increasingly important role in human life, and thus antennas for receiving satellite signals are also increasingly widely used. However, due to the influence of the earth near-far effect, the existing antenna has excessively high central gain margin and insufficient margin of edge link gain, so that the design difficulty of the satellite measurement and control and attitude control subsystem is increased, the use efficiency of the antenna is reduced, and the overhead of on-satellite power resources is increased.
Disclosure of Invention
An object of the utility model is to provide a wide bandwidth beam forming observes and controls antenna can solve the current too high of antenna center gain margin, the not enough problem of marginal link gain allowance.
Realize the utility model discloses the technical scheme of purpose as follows:
the utility model provides a wide bandwidth beam shaping observes and controls antenna, include: the antenna comprises a conical cylinder, a feed microstrip line, a balun, a first antenna radiating arm, a second antenna radiating arm and a feed port; the conical cylinder comprises a hollow inner cavity, and a feed PCB is arranged in the inner cavity along the axial direction of the conical cylinder; one surface of the feed PCB is sequentially provided with the balun and the feed microstrip line from the top end to the bottom end, and the other surface is provided with a metal layer; the bottom end of the feed microstrip line is connected with the feed port; one end of the first antenna radiation arm is connected with the top end of the feed microstrip line through the balun; one end of the second antenna radiation arm is connected with the metal layer; the first antenna radiation arm and the second antenna radiation arm are spirally arranged on the outer wall of the conical cylinder, and the rotation directions of the first antenna radiation arm and the second antenna radiation arm are the same.
Optionally, the wide bandwidth beamforming measurement and control antenna further includes an impedance transformation section, and the impedance transformation section is disposed between the feed microstrip line and the feed port.
Optionally, the balun and the feed microstrip line are integrally disposed.
Optionally, the wideband wide-bandwidth beamforming measurement and control antenna further includes a deployment branch line, the deployment branch line is disposed on the feed microstrip line, and an axis of the deployment branch line and the feed microstrip line form a preset angle.
Optionally, a notch is formed in the feed PCB, and the notch is located at one end of the feed PCB where the balun is disposed; the upper part of the notch is rectangular, and the lower part of the notch is inverted triangular.
Optionally, the wide bandwidth beamforming measurement and control antenna further includes a reflection plate, and the reflection plate is sleeved on an outer wall of the conical cylinder, which is close to the feed port.
Optionally, the broadband wide beam forming measurement and control antenna further comprises an isolation bottom plate; the isolation bottom plate is sleeved on the feed port, and the outer wall of the isolation bottom plate is abutted against the inner wall of the conical cylinder; the conical cylinder and the isolation base plate are provided with mounting holes at the same positions, and the reflecting plate is sleeved on the outer wall of the conical cylinder through the mounting holes.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of wide bandwidth beam shaping observes and controls antenna sets up feed PCB board through along a toper section of thick bamboo axial in the hollow inner chamber of toper section of thick bamboo, sets gradually balun and feed microstrip line in one side from the top to the bottom of feed PCB board, and the another side sets up the metal level. The bottom end of the feed microstrip line is connected with the feed port, one end of the first antenna radiating arm is connected with the top end of the feed microstrip line through the balun, and one end of the second antenna radiating arm is connected with the metal layer. Meanwhile, the first antenna radiating arm and the second antenna radiating arm are spirally arranged on the outer wall of the conical cylinder. Through the structural arrangement, the antenna can be shared for receiving and transmitting, and broadband and wide beam work can be realized. The surface current distribution control is realized by adjusting the structure parameters such as the wire diameter, the winding radius, the lift angle, the number of turns and the like of the first antenna radiation arm and the second antenna radiation arm, so that the far field radiation performance is changed, the directional diagram shaping design is realized, the edge gain level and the circular polarization purity at the wide angle of the beam can be improved according to actual needs, and the problems of overhigh central gain margin and insufficient edge link gain margin caused by the earth near-far effect are solved.
Drawings
Fig. 1 is a schematic structural diagram of a wide bandwidth beam forming measurement and control antenna provided in an embodiment of the present invention;
fig. 2 is a VSWR graph of an antenna according to an embodiment of the present invention;
fig. 3 is a graph of AR curve of the receiving frequency point (low frequency) provided by the embodiment of the present invention;
fig. 4 is a sector directional diagram of a receiving frequency point (low frequency) provided by an embodiment of the present invention;
fig. 5 is an AR curve diagram of the transmission frequency point (high frequency) provided by the embodiment of the present invention;
fig. 6 is a saddle-shaped directional diagram of transmission frequency points (high frequency) according to an embodiment of the present invention.
Icon: 1-a conical cylinder; 2-a feed microstrip line; 3-balun; 4-a first antenna radiating arm; 5-a second antenna radiating arm; 6-a feed port; 7-inner cavity; 8-feeding PCB board; 9-impedance transformation section; 10-allocating branch lines; 11-notches; 12-an isolation floor; 13-mounting holes; 14-metal short-circuit surface; 15-short-circuit body.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wide bandwidth beam forming measurement and control antenna according to an embodiment of the present invention. The wide bandwidth beam forming measurement and control antenna comprises: the antenna comprises a conical cylinder 1, a feed microstrip line 2, a Balun 3 (English), a first antenna radiation arm 4, a second antenna radiation arm 5 and a feed port 6.
In practical application, the dielectric support is a main support structure of the antenna, and its electrical performance parameters directly affect the final radiation characteristics of the antenna. The embodiment of the utility model provides a conical section of thick bamboo 1 as antenna medium supporter chooses the even dielectric material of low dielectric constant, little loss, tangent for use to realize little dielectric loss design, can play and reduce antenna medium supporter equivalent dielectric constant, reduce the Q value, promote antenna radiation efficiency, thereby realize the high-efficient high-gain radiation of antenna, and extend the effect of antenna operating band.
In practice, the changes of the structural parameters such as the winding radius, the lead angle, the number of turns and the like of the antenna radiation arm and the inaccurate installation all cause the deterioration of the electrical performance of the antenna, and change the beam width, the gain and the axial ratio performance of the antenna. Therefore, the shape and position precision and size of the two antenna radiation arms are ensured by the medium support body, so that the electrical property of the antenna is ensured to have good robustness under a satellite-borne severe environment. And the utility model discloses a cone 1 is as the antenna medium supporter, and its toper shape design can provide high accuracy structural support for first antenna radiation arm 4 and second antenna radiation arm 5 to satisfy relative position relation demands such as two antenna radiation arm specific line footpaths, coiling radius, lead angle, number of turns, thereby guarantee that the antenna finally has accuracy, stable and reliable radiation performance.
The conical cylinder 1 comprises a hollow inner cavity 7, air is filled in the inner cavity 7, the high specific stiffness design of an antenna structure can be realized, and the weight of the antenna is obviously reduced on the premise that the radiation performance of the antenna is almost unchanged, so that the lightweight design of the antenna is realized.
A feed PCB (printed Circuit Board) 8 is arranged in the inner cavity 7 of the conical barrel 1 along the axial direction of the conical barrel 1. One side of the feed PCB board 8 is provided with a balun 3 and a feed microstrip line 2 in sequence from the top end to the bottom end, and the other side is provided with a metal layer. The wide band rejection matching of the antenna in the receiving and transmitting frequency band can be realized by tuning the width of the feed microstrip line 2.
The bottom end of the feed microstrip line 2 is connected with a feed port 6. The feed port 6 is used as a conversion section from the feed microstrip line 2 to the sma tuner, and can realize conversion from the coaxial line TEM mode to the feed microstrip line 2 quasi-TEM mode.
One end of the first antenna radiating arm 4 is connected with the top end of the feed microstrip line 2 through the balun 3, and one end of the second antenna radiating arm 5 is connected with the metal layer. The first antenna radiation arm 4 and the second antenna radiation arm 5 are spirally arranged on the outer wall of the conical cylinder 1, and the rotation directions are the same.
The first antenna radiation arm 4 and the second antenna radiation arm 5 form a double-helix radiation structure, conversion radiation from high-frequency current to space electromagnetic wave can be realized through the first antenna radiation arm 4 and the second antenna radiation arm 5, and broadband work can be realized by adopting a tapered gradient traveling wave structure.
The first antenna radiating arm 4 and the second antenna radiating arm 5 are excited at the antenna tip with 180 ° opposite phase feeding. Specifically, one end of the first antenna radiation arm 4 is in short-circuit connection with the central feed microstrip line 2 through the balun 3, and the second antenna radiation arm 5 is in short-circuit connection with the metal layer on the back of the central feed microstrip line 2, so that reverse phase excitation and radiation of a back radiation pattern are realized.
Under the working state, high-frequency traveling wave current enters the antenna from the feed port 6, is transmitted by the feed microstrip line 2 and the balun 3, and then realizes backfire feed at the top ends of the two antenna radiation arms. Then the high-frequency traveling wave current flows to the bottom end along the top ends of the two spirally arranged antenna radiation arms, the high-frequency traveling wave current is gradually attenuated to 0 at the bottom end, and finally broadband wide-beam radiation is realized.
Because the two antenna radiation arms are arranged on the conical cylinder 1, the space shape is small at the top and large at the bottom, and then the structural parameters such as specific wire diameter, winding radius, lift angle, turn number, screw pitch, turn number, feed position and the like of the first antenna radiation arm 4 and the second antenna radiation arm 5 are adjusted, or the structural parameters such as wall thickness, height, top and bottom diameters, dielectric constant and the like of the conical cylinder 1 are adjusted, the near-field coupling relation can be changed, the surface current distribution control can be realized, the surface current distribution of the two antenna radiation arms is changed, so that the far-field radiation performance is changed, through a numerical optimization algorithm, a global optimal solution is searched and then substituted into full-wave electromagnetic simulation software, the final radiation performance is evaluated, the directional diagram can be changed into an ISO shaped matched beam shape or a fan-shaped flat-top directional diagram shape from a conventional sin. In practice, different structural parameters and electrical performance parameters are arranged and combined, and the antenna structure is changed, so that different beam forming shapes can be obtained.
In practice, as shown in fig. 1, the tip of the conical cylinder 1 is also provided with a short-circuiting body 15.
The utility model provides a pair of wide bandwidth beam shaping observes and controls antenna sets up feed PCB board 8 through 1 axial along a toper section of thick bamboo in the hollow inner chamber 7 of a toper section of thick bamboo 1, sets gradually balun 3 and feed microstrip line 2 from the top to the bottom in the one side of feed PCB board 8, and the another side sets up the metal level. The bottom end of the feed microstrip line 2 is connected with a feed port 6, one end of a first antenna radiation arm 4 is connected with the top end of the feed microstrip line 2 through a balun 3, and one end of a second antenna radiation arm 5 is connected with a metal layer. While the first antenna radiating arm 4 and the second antenna radiating arm 5 are spirally provided on the outer wall of the cone 1. Through the structural arrangement, the antenna can be shared for receiving and transmitting, and broadband and wide beam work can be realized. And surface current distribution control can be realized by adjusting the structure parameters such as the wire diameter, the winding radius, the lead angle, the number of turns and the like of the first antenna radiation arm 4 and the second antenna radiation arm 5, so that the far field radiation performance is changed, the directional diagram shaping design is realized, the edge gain level and the circular polarization purity at the wide angle of the beam can be improved according to actual requirements, and the problems of overhigh central gain margin and insufficient margin of edge link gain caused by the earth near-far effect are solved.
And the utility model discloses an antenna can realize broadband high performance circular polarization radiation, and has apparent miniaturized lightweight design characteristic, simple structure, reliability height, longe-lived, electrical property are excellent simultaneously, easily use in the limited little satellite of space resource and the integrated installation of receiving satellite platform a little. The broadband design of the traveling wave structure ensures that the antenna has nearly consistent impedance characteristics in a wider frequency band range, and further can realize the receiving and transmitting shared design with a larger frequency ratio, thereby omitting the structure of a complex feed network with a receiving and transmitting separation structure, and being an ideal UXB receiving and transmitting shared spaceborne measurement and control antenna form.
As shown in fig. 1, the wide bandwidth beamforming measurement and control antenna of this embodiment further includes an impedance transformation section 9, where the impedance transformation section 9 is disposed between the feed microstrip line 2 and the feed port 6. By tuning the length, width and position of the impedance transformation section 9, the matching of the broadband impedance of the antenna in the transmitting and receiving frequency bands can be realized.
Optionally, the balun 3 and the feed microstrip line 2 of the wide-bandwidth beam-forming measurement and control antenna of this embodiment are integrally arranged, so that impedance matching and excitation feeding are better achieved.
As shown in fig. 1, the wideband wide-bandwidth beamforming measurement and control antenna of the present embodiment further includes a deployment branch line 10, where the deployment branch line 10 is disposed on the feed microstrip line 2, and an axis of the deployment branch line and the feed microstrip line 2 form a preset angle.
Wherein, the size of the preset angle is selected by those skilled in the art according to the requirement, and the preset angle is generally 90 °. In practical application, tuning of different equivalent lumped parameter capacitance and inductance values can be realized by adjusting the loading position, the length and the width of the adjusting branch line 10, so that the impedance matching performance of the antenna is further improved, and broadband work is realized.
Alternatively, as shown in fig. 1, a notch 11 is provided on the feed PCB 8, and the notch 11 is located at one end of the feed PCB 8 where the balun 3 is disposed. The upper part of the notch 11 is rectangular, and the lower part is inverted triangular.
The notch 11 and the balun 3 are matched for use, so that the unbalanced-to-balanced conversion of the antenna can be realized, and further the antenna can realize impedance matching and excitation feeding in a wide band range of an X wave band of 7 GHz-9 GHz.
Optionally, the wide bandwidth beamforming measurement and control antenna provided in this embodiment further includes a reflection plate, and the reflection plate is sleeved on an outer wall of the conical cylinder 1, which is close to the feed port 6. The arrangement of the reflecting plate not only can improve the receiving sensitivity of the antenna signal, but also can block and shield the interference of other radio waves from the opposite direction to the received signal.
As shown in fig. 1, the wide bandwidth beamforming measurement and control antenna of the present embodiment further includes an isolation base plate 12. The feed port 6 is located to the isolation bottom plate 12 cover, and the outer wall supports in the inner wall of a toper section of thick bamboo 1, and a toper section of thick bamboo 1 and isolation bottom plate 12 same position department are provided with mounting hole 13, and the reflecting plate passes through mounting hole 13 cover and locates the outer wall of a toper section of thick bamboo 1.
The isolation base plate 12 is generally a metal plate, and can provide radio frequency grounding, and improve and modify radiation performance of a directional pattern, so that the front-to-back ratio of the directional pattern of the antenna is further improved, the robustness of the antenna is enhanced, adverse loading degradation influence of non-ideal EM environment on the performance of the antenna is reduced, and good EMC design of the antenna body is realized. Meanwhile, due to the arrangement of the isolation bottom plate 12, the rigidity of the antenna can be further enhanced, the mechanical property of the antenna is improved, and the requirement of a satellite-borne environment is met.
Continuing to refer to as shown in fig. 1, the embodiment of the present invention provides a wide bandwidth beam forming measurement and control antenna, which further includes a metal short circuit surface 14, wherein the metal short circuit surface 14 is disposed on the isolation bottom plate 12, and the side wall is supported on the inner wall of the conical cylinder 1.
Fig. 2 is a VSWR graph of an antenna according to an embodiment of the present invention. It can be seen from the figure that, in the operating frequency band range of 6.2GHz to 9.1GHz, the VSWR of the antenna provided by the embodiment is less than 2, that is, the antenna has a good broadband impedance matching characteristic in a bandwidth range of about 38%. Within the working frequency band range of 7.1 GHz-8.6 GHz, the VSWR of the antenna provided by the embodiment is less than 1.5. At the central frequency point, the VSWR of the antenna provided by the present embodiment is about 1.04, and excellent impedance matching with almost no reflection is achieved. Therefore, the antenna provided by the embodiment of the utility model has better broadband impedance matching characteristic.
Fig. 3 is a graph of AR curve of the receiving frequency point (low frequency) provided by the embodiment of the present invention. The figure is the measurement and control antenna AR calculation result for the sector shaped beam scheme. It can be seen that the zenith direction AR, i.e. the center AR, is about 2dB, and the AR can achieve a design index of less than 5dB within the 120 ° beam range. In a wave beam area of about +/-50 degrees, the antenna has the best circularly polarized radiation characteristic, and AR is better than 2.5 dB. Therefore, the AR in the whole main beam width range is less than 5dB, the cross polarization suppression degree is good, and the high-purity circularly polarized radiation is realized.
Fig. 4 is a sector directional diagram of a receiving frequency point (low frequency) provided by the embodiment of the present invention. The figure is a simulation result of radiation of a sector pattern of an antenna receiving frequency band, and it can be seen that the antenna gain is constant at 5dB within the beam width of minus 40 degrees to plus 40 degrees. Therefore, the embodiment of the present invention provides an antenna with a good sector-shaped forming result.
Fig. 5 is a graph of the AR curve of the transmission frequency point (high frequency). The figure is the measurement and control antenna AR calculation result in the ISO shaped beam scheme. It can be seen that the central AR is about 2dB, and a design criterion of AR less than 5dB can be achieved in a beam range of approximately 130 °. In the wave beam area of +/-60 degrees or so, the antenna has the best circularly polarized radiation characteristic, and the AR is better than 3 dB. Therefore, after ISO shaping, AR in the main beam range is less than 5dB, and the central AR is less than 2dB, so that the antenna has better performance.
Fig. 6 is a saddle-shaped directional diagram of transmission frequency points (high frequency) according to an embodiment of the present invention. The figure shows the results of simulation calculations for 6 different sections at 30 ° intervals. As can be seen, the gain of the antenna center is about 3dB, the maximum radiation direction is at +/-67 degrees, and the gain is about 4.7 dB. The ISO beam antenna center gain drops by about 4dB compared to the normal conventional beam scheme, but the gain rises significantly at the main beam edge. The wave beam is increased by nearly 3dB at +/-67 degrees compared with the common wave beam, so that the wave beam is effectively widened, and the effective gain coverage range of the single antenna is greatly expanded. At ± 70 ° and ± 80 °, the simulated gains are 2.5dB and 0dB, respectively, and if the 0dB gain line is used as a reference, the ISO scheme beam is widened by 20 °. Therefore, the antenna provided by the embodiment of the invention has ideal wide-beam and wide-angle circularly polarized rotational symmetry performance. The antenna gains are almost completely consistent for different sections and the same elevation position.
The utility model discloses ISO beam design scheme that takes shape through carrying out the design of figure to ordinary beam, central zone gain is lower promptly, marginal gain is higher, when reducing the regional surplus gain in center, carries wide angle beam marginal antenna gain by a wide margin, further widens the antenna beam, improves effective gain coverage, compensaties the influence of LEO satellite near-far effect to the mesh that improves the entire system performance has been reached.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A wide bandwidth beamforming measurement and control antenna, comprising: the antenna comprises a conical cylinder, a feed microstrip line, a balun, a first antenna radiating arm, a second antenna radiating arm and a feed port;
the conical cylinder comprises a hollow inner cavity, and a feed PCB is arranged in the inner cavity along the axial direction of the conical cylinder;
one surface of the feed PCB is sequentially provided with the balun and the feed microstrip line from the top end to the bottom end, and the other surface is provided with a metal layer;
the bottom end of the feed microstrip line is connected with the feed port;
one end of the first antenna radiation arm is connected with the top end of the feed microstrip line through the balun;
one end of the second antenna radiation arm is connected with the metal layer;
the first antenna radiation arm and the second antenna radiation arm are spirally arranged on the outer wall of the conical cylinder, and the rotation directions of the first antenna radiation arm and the second antenna radiation arm are the same.
2. The wide bandwidth beamforming measurement and control antenna according to claim 1, further comprising an impedance transformation section disposed between the feed microstrip line and the feed port.
3. The wide bandwidth beamforming measurement and control antenna according to claim 1, wherein the balun and the feeding microstrip line are integrally disposed.
4. The wide bandwidth beamforming measurement and control antenna according to claim 1, further comprising a deployment branch line, wherein the deployment branch line is disposed on the feeding microstrip line, and an axis thereof forms a predetermined angle with the feeding microstrip line.
5. The wide bandwidth beamforming measurement and control antenna according to claim 1, wherein a slot is disposed on the feeding PCB, and the slot is located at an end of the feeding PCB where the balun is disposed;
the upper part of the notch is rectangular, and the lower part of the notch is inverted triangular.
6. The wide bandwidth beamforming measurement and control antenna according to claim 1, further comprising a reflection plate, wherein the reflection plate is sleeved on an outer wall of the conical cylinder near the feeding port.
7. The wide bandwidth beamforming measurement and control antenna of claim 6, further comprising an isolation backplane;
the isolation bottom plate is sleeved on the feed port, and the outer wall of the isolation bottom plate is abutted against the inner wall of the conical cylinder;
the conical cylinder and the isolation base plate are provided with mounting holes at the same positions, and the reflecting plate is sleeved on the outer wall of the conical cylinder through the mounting holes.
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| CN202022398004.3U CN212968048U (en) | 2020-10-23 | 2020-10-23 | Wide-bandwidth beam forming measurement and control antenna |
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| CN202022398004.3U CN212968048U (en) | 2020-10-23 | 2020-10-23 | Wide-bandwidth beam forming measurement and control antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922059A (en) * | 2021-11-25 | 2022-01-11 | 中国科学院微小卫星创新研究院 | Conical helical antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922059A (en) * | 2021-11-25 | 2022-01-11 | 中国科学院微小卫星创新研究院 | Conical helical antenna |
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