CN211655054U - Liquid crystal active phased array antenna - Google Patents
Liquid crystal active phased array antenna Download PDFInfo
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- CN211655054U CN211655054U CN202020388752.0U CN202020388752U CN211655054U CN 211655054 U CN211655054 U CN 211655054U CN 202020388752 U CN202020388752 U CN 202020388752U CN 211655054 U CN211655054 U CN 211655054U
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Abstract
The utility model provides a liquid crystal active phased array antenna, which comprises an antenna array unit (1); a first multilayer substrate (2); a shield-heatsink-waveguide metal cavity (3); a second multilayer substrate (4), wherein the second multilayer substrate (4) integrates a radio frequency amplification module (5) and a heat conduction column (6); a heat-dissipating pad (7); a first glass substrate (16); a liquid crystal layer (9) located between the first glass substrate (16) and the second glass substrate (17); a liquid crystal phase shifter (10) located between the liquid crystal layer (9) and the second glass substrate (17); a second glass substrate (17); a third multilayer substrate (8); and the waveguide power distribution network metal cavity (11) is positioned below the third multilayer substrate (8). The utility model provides a liquid crystal moves looks ware (10) antenna metal ground guide's design difficulty, is applied to liquid crystal with active module and moves looks ware (10), reduces the liquid crystal and moves the system loss of looks ware (10) array antenna.
Description
Technical Field
The utility model relates to a phased array antenna technical field, concretely relates to liquid crystal active phased array antenna.
Background
The back end of each antenna unit of the active phased array comprises a complete set of independent transceiving (T/R) components, and can control and form various radiation beams: high-gain single-beam radiation, multi-beam directional radiation and the like, and due to the independence of each unit, one active phased array can be divided into a plurality of radar or communication transceiving arrays, so that the use flexibility is improved compared with a passive phased array.
The conventional T/R component of the active phased array comprises a transmitting branch, a receiving branch, a radio frequency change-over switch and a phase shifter. Each T/R component has a transmit High Power Amplifier (HPA), a filter, a limiter, and a Low Noise Amplifier (LNA), an attenuator and phase shifter, a beam steering circuit, etc. Therefore, the high cost and the large power consumption are the main problems.
In recent years, the improvement of the technology of high-performance electromagnetic liquid crystal materials provides an effective solution for the design of low-cost and low-power-consumption phased array antennas, and the liquid crystal phased array antenna technology becomes the focus of attention and research and development of a plurality of manufacturers as a revolutionary technical innovation. At present, a plurality of technical problems are faced in the design practice of the liquid crystal phase shifter, for example, the loss is large due to the large thickness of a liquid crystal layer, the response time is long, and the like; for radio frequency signals, a feed network, an antenna, an active component, a control power supply and the like all need to have a metal ground, under the existing process capability, in order to ensure the uniformity of the thickness of liquid crystal, the liquid crystal can only be packaged in a double-layer glass substrate, and in order to realize the effective utilization of the liquid crystal performance, the metal ground of a liquid crystal panel is usually required to be placed on a substrate at one side in a box, and the external lead of the metal ground is realized by adopting a glass punching mode, so that the liquid leakage phenomenon is easy to occur, the yield is reduced, and the process realization of a metallized glass through hole is still very difficult, therefore, the non-contact ground lead is realized in the design of a liquid crystal phased array antenna, and further, the arrangement of a plurality of layers of metal ground is extremely urgent.
Although the liquid crystal phase shifter has the remarkable advantages of high FoM, high phase control precision, low power consumption, low cost and the like compared with the traditional digital phase shifter, in practical application, in order to improve performance indexes and design flexibility, the liquid crystal phased array antenna sometimes needs to adopt an active architecture design, and an active radio frequency amplification module (5) is introduced between the antenna and the phase shifter. Due to the special structures of the liquid crystal phase shifter and the panel, the radio frequency amplification module (5) cannot be directly welded between the antenna and the phase shifter, which is one of the main technical difficulties faced in the field of the design of the current liquid crystal phased array antenna.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is realized through the following technical scheme.
In order to solve the problem, the utility model discloses combine the waveguide cavity, increase choking sheetmetal (19) and draw ground, solve the difficult problem that radio frequency ground draws outward in the glass substrate box. The short circuit structure that traditional waveguide changes transmission line used can influence antenna radiation, and multilayer substrate can solve the coexistence problem of short circuit structure and antenna radiation piece.
The utility model provides an active phased array antenna of liquid crystal, including from the top down arranging in proper order:
an antenna array unit (1);
a first multilayer substrate (2);
a shield-heatsink-waveguide metal cavity (3);
the second multilayer substrate (4), the second multilayer substrate (4) integrates a radio frequency amplification module (5), a heat conduction column (6) and a heat dissipation gasket (7);
a first glass substrate (16);
a liquid crystal layer (9) located between the first glass substrate (16) and the second glass substrate (17); a liquid crystal phase shifter (10) located between the liquid crystal layer (9) and the second glass substrate (17);
a second glass substrate (17);
a third multilayer substrate (8);
and the waveguide power distribution network metal cavity (11) is positioned below the third multilayer substrate (8).
Furthermore, a conductive through hole (15), a conductive blind hole (13) and a first metal ground (12) are arranged in the first multilayer substrate (2), the conductive through hole (15) is connected with the antenna array unit (1) on the top layer of the first multilayer substrate (2) and the first transmission line on the bottom layer of the first multilayer substrate (2), and the conductive through hole (15) is not in contact with the first metal ground (12).
Furthermore, a first transmission line-to-waveguide structure (14) is further arranged in the first multilayer substrate (2), and the first transmission line-to-waveguide structure (14) comprises a transmission line, a matching line, a radiation sheet and a choking metal sheet (19); the conductive blind holes (13) in the first multilayer substrate (2) are positioned around the radiating sheet of the first transmission line waveguide structure (14) and are connected with the first metal ground (12) in the first multilayer substrate (2) but are not connected with the first transmission line, the matching line and the radiating sheet.
Furthermore, the shielding-radiating-waveguide metal cavity (3) is positioned below the first multilayer substrate (2), and a shielding groove and a waveguide opening are formed around the radiating fin of the radiating gasket (7) and the first transmission line waveguide structure (14).
Furthermore, the heat dissipation gasket (7) is wrapped by a shielding groove of the shielding-heat dissipation-waveguide metal cavity (3) and is in contact with the conductive blind hole (13) of the first multilayer substrate (2) but not connected with the first transmission line, the matching line and the radiation sheet, and the center of the waveguide opening of the shielding-heat dissipation-waveguide metal cavity (3) is aligned with the center of the radiation sheet of the first transmission line-waveguide structure (14).
Furthermore, a choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged inside the second multilayer substrate (4).
Further, the heat dissipation gasket (7) is located between the second multilayer substrate (4) and the shielding-heat dissipation-waveguide metal cavity (3), and connects the heat conduction column (6) and the shielding-heat dissipation-waveguide metal cavity (3).
Furthermore, the heat-conducting column (6) is arranged in the first glass substrate (16) and is connected with the heat-radiating gasket (7) and the radio frequency amplification module (5).
Furthermore, the radio frequency amplification module (5) is arranged in a first glass substrate (16) used for packaging the liquid crystal layer (9) in a built-in mode, the integrated design of the liquid crystal packaging and the radio frequency amplification module (5) is achieved, and a second metal ground (18) with a slit is arranged at the bottom of the first glass substrate (16).
Further, the liquid crystal phase shifter (10) unit is located on top of a third multilayer substrate (8); signals are coupled from the transmission line of the first waveguide transmission line structure on the second multilayer substrate (4) through the slot of the second metal ground (18) to the liquid crystal phase shifter (10) unit on top of the third multilayer substrate (8).
Furthermore, a first electrode of the liquid crystal phase shifter (10) unit is positioned between the second metal ground (18) and the liquid crystal layer (9), a second electrode is positioned between the liquid crystal phase shifter (10) unit and the liquid crystal layer (9), and the phase shift amount of the liquid crystal phase shifter (10) is controlled by controlling the voltage difference between the first electrode and the second electrode.
Furthermore, a choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged inside the third multilayer substrate (8).
Further, the second transmission line-to-waveguide structure is located at the bottom of the third multilayer substrate (8) and comprises a transmission line, a matching line, a radiation sheet and a choke metal sheet (19).
Furthermore, the waveguide power distribution network metal cavity (11) is located below the third multilayer substrate (8), has the characteristic of single-waveguide-port input and multi-waveguide-port output, is designed in a waveguide form according to a required radio frequency signal power distribution ratio, and is provided with a waveguide port meeting requirements at the top of the cavity.
Further, an output waveguide port of the waveguide power distribution network metal cavity (11) is aligned with the center of the radiating sheet of the second transmission line-to-waveguide structure.
The utility model has the advantages that: the utility model discloses having carried out integration design with radio frequency amplification module and liquid crystal phased array antenna, having designed inside the antenna panel structure with it, and add shielding structure easily, reduce the radio frequency and amplify the influence that the module was to the antenna and was moved the looks ware, the integration design of shielding, heat dissipation, waveguide has still improved space utilization simultaneously.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a liquid crystal active phased array antenna according to an embodiment of the present invention;
fig. 2(a) shows a top view of a phase shifter structure according to an embodiment of the present invention; fig. 2(b) is a side cross-sectional view of a phase shifter structure according to an embodiment of the present invention. Fig. 2(c) is an equivalent circuit model of an embodiment of the present invention.
Fig. 3 shows a transition side view of a liquid crystal microstrip to an overhead waveguide according to an embodiment of the present invention;
fig. 4 shows a transition top view of a liquid crystal microstrip to top waveguide according to an embodiment of the present invention;
fig. 5 shows a transition side view of a liquid crystal microstrip to a lower waveguide according to an embodiment of the present invention;
fig. 6 shows a transition top view of a liquid crystal microstrip to an underlying waveguide according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The utility model relates to an antenna work is in the Ku frequency channel, and of course those skilled in the art can know, is fit for using equally at other frequency channels. The whole antenna is of a multilayer structure and is described from top to bottom by combining the attached drawings: as shown in fig. 1, an active phased array antenna for liquid crystal includes, arranged from top to bottom: an antenna array unit (1); a first multilayer substrate (2); a shield-heatsink-waveguide metal cavity (3); the second multilayer substrate (4), the radio frequency amplification module (5) and the heat conduction column (6) are integrated on the second multilayer substrate (4); a heat-dissipating pad (7); a first glass substrate (16); a liquid crystal layer (9) located between the first glass substrate (16) and the second glass substrate (17); a liquid crystal phase shifter (10) located between the liquid crystal layer (9) and the second glass substrate (17); a second glass substrate (17); a third multilayer substrate (8); and the waveguide power distribution network metal cavity (11) is positioned below the third multilayer substrate (8).
The antenna array unit (1) is arranged on the uppermost layer of the whole antenna and etched on the upper surface of the first multilayer substrate (2). As shown in fig. 3, the lowest layer of the first multi-layer substrate (2) is a microstrip feed network feeding the antenna on the uppermost layer, with a layer of intact metal between the antenna and the feed network serving as a common ground for the upper and lower feed networks. The transmission of radio frequency signals in the feed network and the signal radiation of the antenna patch are completely isolated, the radiation efficiency of the antenna can be improved, the radiation pattern of the antenna is ensured to be closer to a theoretical value, and the subsequent beam forming and control are facilitated. The signal transmission between the feed network and the radiation patch can be designed and selected correspondingly according to different use requirements in a coupling or probe direct connection mode.
The first multilayer substrate (2) is internally provided with a conductive through hole (15), a conductive blind hole (13) and a first metal ground (12), the conductive through hole (15) is connected with the antenna array unit (1) positioned at the top layer of the first multilayer substrate (2) and the first transmission line positioned at the bottom layer of the first multilayer substrate (2), and the conductive through hole (15) is not contacted with the first metal ground (12).
As shown in fig. 4, a first transmission line waveguide structure (14) is further disposed in the first multilayer substrate (2), and the first transmission line waveguide structure (14) includes a transmission line, a matching line, a radiation plate and a choke metal plate (19); the conductive blind hole (13) in the first multilayer substrate (2) is positioned around the radiating sheet of the first transmission line waveguide structure (14) and is connected with the first metal ground (12) in the first multilayer substrate (2) but is not connected with the first transmission line, the matching line and the radiating sheet.
The shielding-heat dissipation-waveguide metal cavity (3) is tightly attached to the lower portion of the first multilayer substrate (2) and mainly aims to transmit signals of a feed network to a module of the second multilayer substrate (4). The waveguide metal cavity is used as a signal transmission medium, so that signal crosstalk between the antenna on the uppermost layer and the middle radio frequency amplification module (5) is shielded, and the heat dissipation of the whole antenna is facilitated. Additionally the utility model discloses a multilayer substrate hardness is limited, and middle waveguide metal cavity has certain supporting role to whole antenna structure, increases overall structure's intensity.
The shielding-heat dissipation-waveguide metal cavity (3) is positioned below the first multilayer substrate (2), and a shielding groove and a waveguide opening are formed around the heat dissipation gasket (7) and the radiation sheet of the first transmission line-to-waveguide structure (14).
The shielding groove of the shielding-radiating-waveguide metal cavity (3) wraps the radiating gasket (7) and is in contact with the conductive blind hole (13) of the first multilayer substrate (2) but not connected with the first transmission line, the matching line and the radiating sheet, and the center of the waveguide opening of the shielding-radiating-waveguide metal cavity (3) is aligned with the center of the radiating sheet of the first transmission line-waveguide structure (14).
A choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged in the second multilayer substrate (4).
The radio frequency amplification module (5) is arranged in a first glass substrate (16) used for packaging the liquid crystal layer (9) in a built-in mode, the integrated design of liquid crystal packaging and the radio frequency amplification module (5) is achieved, and a second metal ground (18) with a slit is arranged at the bottom of the first glass substrate (16).
The heat conducting column (6) is arranged in the first glass substrate (16) and connected with the radiating gasket (7) and the radio frequency amplification module (5).
The heat dissipation gasket (7) is positioned between the second multilayer substrate (4) and the shielding-heat dissipation-waveguide metal cavity (3) and is connected with the heat conduction column (6) and the shielding-heat dissipation-waveguide metal cavity (3).
The second multilayer substrate (4) is positioned below the shielding-heat dissipation-waveguide metal cavity (3), the upper surface of the second multilayer substrate is a radio frequency microstrip line, the radio frequency microstrip line receives radio frequency signals transmitted by the waveguide metal cavity, the metal probe guides the signals into the radio frequency amplification module (5) at the lower layer, and the radio frequency amplification module (5) in the figure 1 is arranged in the first glass substrate (16). The first multilayer substrate (2), the second multilayer substrate (4) and the second multilayer substrate (4) can be made of one or more of materials such as silicon, glass, PCB, ceramics, sapphire, silicon carbide and the like, and are plane or curved surfaces. In this embodiment, as shown in fig. 5, the uppermost substrate of the third multilayer substrate (8) and the lowermost substrate of the second multilayer substrate (4) are both glass. Integrate radio frequency amplification module (5) inside glass, improved the utility model discloses the compactness of structure. The radio frequency amplification module (5) can produce the heat in the use, the utility model discloses add radiating gasket (7) among second multilayer substrate (4), on the waveguide metal cavity of the leading-in top of heat that produces radio frequency amplification module (5), guarantee heat dispersion, make it can the steady operation.
A choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged in the third multilayer substrate (8). As shown in fig. 6, the second transmission line-to-waveguide structure is located at the bottom of the third multi-layer substrate (8), and includes a transmission line, a matching line, a radiation plate and a choke metal plate (19).
The liquid crystal phase shifter (10) unit is positioned on the top of the third multilayer substrate (8); signals are coupled from the transmission line of the first waveguide transmission line structure on the second multilayer substrate (4) through the slot of the second metal ground (18) to the liquid crystal phase shifter (10) unit on top of the third multilayer substrate (8).
As shown in FIG. 2(b), the first electrode of the liquid crystal phase shifter 10 is located between the second metal ground 18 and the liquid crystal layer 9, the second electrode is located between the liquid crystal phase shifter 10 and the liquid crystal layer 9, and the phase shift amount of the liquid crystal phase shifter 10 is controlled by controlling the voltage difference between the first electrode and the second electrode.
The waveguide power distribution network metal cavity (11) is positioned below the third multilayer substrate (8), has the characteristic of single-waveguide-port input and multi-waveguide-port output, designs a waveguide form according to the required radio frequency signal power distribution ratio, and is provided with a waveguide port meeting the requirement at the top of the cavity.
The output waveguide port of the waveguide power distribution network metal cavity (11) is aligned with the center of the radiating sheet of the second transmission line-to-waveguide structure.
The liquid crystal phase shifter (10) is one of the core technical means of the utility model, the liquid crystal is arranged between the glass substrate of the uppermost layer in the glass substrate of the lowest layer and the third multilayer substrate (8) in the second multilayer substrate (4), and the box is made between the glass, and the liquid crystal is the current mature process means, thereby ensuring the practicability of the utility model. The utility model discloses use liquid crystal thickness to keep box thickness below 30um promptly, the liquid crystal response speed of low box thickness is fast to the use in the radio frequency field just can be realized to the looks ware of this design, and the liquid crystal leans on voltage drive, and internal current is close 0, and the drive consumption is very low. Although the liquid crystal phase shifter (10) has the significant advantages of high FoM, high phase control precision, low power consumption, low cost and the like compared with the traditional digital phase shifter, in practical application, in order to improve performance index and design flexibility, the liquid crystal phased array antenna sometimes needs to adopt an active architecture design, and an active radio frequency amplification module (5) is introduced between the antenna and the phase shifter.
The surface circuit of the liquid crystal phase shifter (10) is positioned below the liquid crystal and above the liquid crystal in a metal manner, wherein the metal manner isolates the crosstalk of the radio frequency transmission signal and the antenna radiation signal again, and plays a certain role in isolating the radio frequency signal of the radio frequency amplification module (5), thereby improving the integrity and consistency of the liquid crystal phase shifter (10). If the metal is placed on the upper layer of the glass above the liquid crystal, namely the liquid crystal with variable state and the glass with fixed state are included between the surface circuit of the phase shifter and the metal ground, the influence of the change of the electric property of the liquid crystal on the state of the phase shifter is reduced, the phase shift amount is reduced, and therefore only one kind of liquid crystal can be arranged between the surface circuit of the phase shifter and the metal ground. Since the layer of metal is arranged above the liquid crystal and below the glass, and the glass cannot be perforated and is difficult to lead out, the choking metal sheet (19) is added in combination with the waveguide cavity, so that the problem that the layer of metal is difficult to lead out is solved.
A third multilayer substrate (8) is disposed below the liquid crystal phase shifter (10). The low box thickness liquid crystal phase shifter (10) has large loss, and the microstrip line taking liquid crystal as a substrate has the same large loss, so in order to reduce the loss, the signal of the phase shifter needs to be led down by one stage, and the third multilayer substrate (8) is led in to transmit the signal of the phase shifter to the lowest waveguide cavity power division network metal cavity (11).
Example phase shifters:
the utility model discloses well looks ware adopts the design method of fractal, has realized the miniaturized structure that moves the ware for each paster below can all place one and move the ware, realizes the full active control of antenna. The liquid crystal is used as a medium, and the effect of changing the phase is achieved through the control of voltage.
As shown in fig. 2(a), in the specific embodiment, a metal trace is disposed on one side of a liquid crystal, and includes a main feeder, a first-level branch and a second-level branch; the other side is a metal ground, and a plurality of rectangular gaps are etched on the metal ground and comprise a first-stage matching gap, a first-stage transmission gap, a second-stage matching gap and a second-stage transmission gap. The mutual arrangement of the branches and the gaps can achieve the adjustment of sensitivity and capacitance, LC oscillation in a working frequency band is realized, the phase difference at two ends of the main feeder line is improved, the purpose of miniaturization is achieved, and the loss is reduced on the premise of the same phase shift quantity.
Fig. 2(c) is an equivalent circuit model of an embodiment of the present invention. 501. 502 is the equivalent inductance formed by the rectangular slot and the metal ground, 601 and 602 are the equivalent capacitance formed by the feeder line, the branch and the metal floor, and 603 is the equivalent adjustable capacitance formed by the feeder line, the branch and the metal floor. The capacitance of 603 can be changed by adjusting the dielectric constant of the metamaterial dielectric layer, so that the phase shift quantity of the phase shifter is changed.
Transition of liquid crystal microstrip to top waveguide:
as shown in fig. 3 and 4, firstly, the microstrip line below the liquid crystal is transferred to the microstrip line on the upper layer of the glass in a slot coupling manner; then the glass upper layer microstrip line is connected to the upper layer microstrip line of the second multilayer substrate (4) in a via hole mode; and the microstrip line on the upper layer of the second substrate is converted into the microstrip waveguide. The second layer substrate comprises a set of grounding structure, namely a plurality of metalized through holes in the second substrate in the figure, a structure for guiding the choking metal sheet (19) to the ground is formed, and the metal ground of the upper layer of the liquid crystal is introduced into the waveguide metal cavity to be commonly grounded.
Transition of liquid crystal microstrip to lower waveguide:
as shown in fig. 5 and 6, because there is no radio frequency amplification module (5), the microstrip line below the liquid crystal is directly connected with the microstrip line at the lower layer of the third substrate in a slot coupling mode, there is no microstrip line below the middle glass, which is different from the waveguide above the rotation, and the slot is located at the same side of the liquid crystal microstrip and the substrate microstrip and on the upper surface of the liquid crystal. Similarly, in this structure, it is necessary to draw out the metal ground of the upper layer of the liquid crystal and draw out the ground by the structure of drawing out the ground by the choke metal piece (19).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (15)
1. An active phased array antenna of liquid crystal, characterized by, include from top to bottom arranged in proper order:
an antenna array unit (1);
a first multilayer substrate (2);
a shield-heatsink-waveguide metal cavity (3);
a second multilayer substrate (4), wherein the second multilayer substrate (4) integrates a radio frequency amplification module (5) and a heat conduction column (6);
a heat-dissipating pad (7);
a first glass substrate (16);
a liquid crystal layer (9) located between the first glass substrate (16) and the second glass substrate (17); a liquid crystal phase shifter (10) located between the liquid crystal layer (9) and the second glass substrate (17);
a second glass substrate (17);
a third multilayer substrate (8);
and the waveguide power distribution network metal cavity (11) is positioned below the third multilayer substrate (8).
2. A liquid crystal active phased array antenna as claimed in claim 1,
the antenna array unit is characterized in that a conductive through hole (15), a conductive blind hole (13) and a first metal ground (12) are formed in the first multilayer substrate (2), the conductive through hole (15) is connected with the antenna array unit (1) located on the top layer of the first multilayer substrate (2) and the first transmission line located on the bottom layer of the first multilayer substrate (2), and the conductive through hole (15) is not in contact with the first metal ground (12).
3. A liquid crystal active phased array antenna as claimed in claim 2,
a first transmission line-to-waveguide structure (14) is further arranged in the first multilayer substrate (2), and the first transmission line-to-waveguide structure (14) comprises a transmission line, a matching line, a radiation sheet and a choking metal sheet (19); the conductive blind holes (13) in the first multilayer substrate (2) are positioned around the radiating sheet of the first transmission line waveguide structure (14) and are connected with the first metal ground (12) in the first multilayer substrate (2) but are not connected with the first transmission line, the matching line and the radiating sheet.
4. A liquid crystal active phased array antenna as claimed in claim 3,
the shielding-heat dissipation-waveguide metal cavity (3) is located below the first multilayer substrate (2), and shielding grooves and waveguide ports are formed around the heat dissipation gasket (7) and the radiation sheet of the first transmission line waveguide structure (14).
5. A liquid crystal active phased array antenna as claimed in claim 4,
the heat dissipation gasket (7) is wrapped by the shielding groove of the shielding-heat dissipation-waveguide metal cavity (3), and is in contact with the conductive blind hole (13) of the first multilayer substrate (2), but is not connected with the first transmission line, the matching line and the radiation sheet, and the center of the waveguide opening of the shielding-heat dissipation-waveguide metal cavity (3) is aligned with the center of the radiation sheet of the first transmission line-waveguide structure (14).
6. A liquid crystal active phased array antenna as claimed in claim 1,
a choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged in the second multilayer substrate (4).
7. A liquid crystal active phased array antenna as claimed in claim 1,
the heat dissipation gasket (7) is positioned between the second multilayer substrate (4) and the shielding-heat dissipation-waveguide metal cavity (3) and connects the heat conduction column (6) and the shielding-heat dissipation-waveguide metal cavity (3).
8. A liquid crystal active phased array antenna as claimed in claim 1,
the heat conduction column (6) is arranged in the first glass substrate (16) and connected with the radiating gasket (7) and the radio frequency amplification module (5).
9. A liquid crystal active phased array antenna as claimed in claim 1,
the radio frequency amplification module (5) is arranged in a first glass substrate (16) used for packaging the liquid crystal layer (9) in a built-in mode, the integrated design of liquid crystal packaging and the radio frequency amplification module (5) is achieved, and a second metal ground (18) with a slit is arranged at the bottom of the first glass substrate (16).
10. A liquid crystal active phased array antenna as claimed in claim 6,
the liquid crystal phase shifter (10) unit is positioned on the top of the third multilayer substrate (8); signals are coupled from the transmission line of the first waveguide transmission line structure on the second multilayer substrate (4) through the slot of the second metal ground (18) to the liquid crystal phase shifter (10) unit on top of the third multilayer substrate (8).
11. A liquid crystal active phased array antenna as claimed in claim 10,
the first electrode of the liquid crystal phase shifter (10) unit is positioned between the second metal ground (18) and the liquid crystal layer (9), the second electrode is positioned between the liquid crystal phase shifter (10) unit and the liquid crystal layer (9), and the phase shifting amount of the liquid crystal phase shifter (10) is controlled by controlling the voltage difference between the first electrode and the second electrode.
12. A liquid crystal active phased array antenna as claimed in claim 1,
and a choke metal sheet (19) for restraining an electric field and a conductive blind hole (13) are arranged in the third multilayer substrate (8).
13. A liquid crystal active phased array antenna as claimed in claim 1,
the second transmission line-to-waveguide structure is positioned at the bottom of the third multilayer substrate (8) and comprises a transmission line, a matching line, a radiation sheet and a choking metal sheet (19).
14. A liquid crystal active phased array antenna as claimed in claim 1,
the waveguide power distribution network metal cavity (11) is located below the third multilayer substrate (8), has the characteristic of single-waveguide-port input and multi-waveguide-port output, is designed in a waveguide form according to a required radio frequency signal power distribution ratio, and is provided with a waveguide port meeting requirements at the top of the cavity.
15. A liquid crystal active phased array antenna as claimed in claim 13, characterized in that the output waveguide port of the waveguide power dividing network metal cavity (11) is aligned with the center of the radiating patch of the second transmission line transition waveguide structure.
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| CN202020388752.0U CN211655054U (en) | 2020-03-24 | 2020-03-24 | Liquid crystal active phased array antenna |
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| CN202020388752.0U CN211655054U (en) | 2020-03-24 | 2020-03-24 | Liquid crystal active phased array antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490677A (en) * | 2020-11-04 | 2021-03-12 | 电子科技大学 | Narrow-band continuously adjustable liquid crystal frequency selection surface and regulating and controlling method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490677A (en) * | 2020-11-04 | 2021-03-12 | 电子科技大学 | Narrow-band continuously adjustable liquid crystal frequency selection surface and regulating and controlling method thereof |
| CN112490677B (en) * | 2020-11-04 | 2022-03-15 | 电子科技大学 | Narrow-band continuously adjustable liquid crystal frequency selection surface and regulating and controlling method thereof |
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