Liquid crystal panel phased array portable station

Abstract

The invention provides a liquid crystal panel phased array portable station, and relates to the technical field of liquid crystal phased array antennas. The liquid crystal panel phased array portable station comprises a liquid crystal phased array antenna, a supporting structure and an antenna housing, the liquid crystal phased-array antenna comprises a plurality of liquid crystal antenna units which are distributed in an array mode. The supporting structure comprises a main supporting part and a side supporting part; the main supporting part is connected with the liquid crystal phased array antenna through a bottom buffer film; the side supporting part is arranged around the main supporting part, and the side surface of the liquid crystal phased-array antenna is connected with the side supporting part through a side buffer film; the radome is connected with the top surface of the liquid crystal phased-array antenna through a top buffer film. The liquid crystal panel phased array portable station can reduce the damage risk.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid crystal phased array antennas, and in particular to a liquid crystal flat-panel phased array portable station. Background Art

[0002] Regarding related technologies, the liquid crystal phased array antenna itself uses PCB (printed circuit board) and thin glass as the substrate. When the liquid crystal phased array antenna is tested at the product stage, the liquid crystal phased array antenna is easily subjected to environmental tests such as impact and vibration, which may cause the product glass to break.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art and provide a liquid crystal flat panel phased array portable station to reduce the risk of damage.

[0005] According to one aspect of the present disclosure, there is provided a liquid crystal flat panel phased array portable station, comprising:

[0006] A liquid crystal phased array antenna, comprising a plurality of liquid crystal antenna units distributed in an array;

[0007] A support structure, comprising a main support portion and a side support portion; the main support portion is connected to the liquid crystal phased array antenna through a bottom buffer film; the side support portion is arranged around the main support portion, and the side surface of the liquid crystal phased array antenna is connected to the side support portion through a side buffer film;

[0008] The antenna cover is connected to the top surface of the liquid crystal phased array antenna through a top buffer film.

[0009] According to an embodiment of the present disclosure, the top buffer film, the side buffer film and the bottom buffer film are made of foam.

[0010] According to an embodiment of the present disclosure, the liquid crystal flat panel phased array portable station further includes:

[0011] The heating film is sandwiched between the bottom buffer film and the liquid crystal phased array antenna.

[0012] According to an embodiment of the present disclosure, the support structure further comprises a flange portion located at an end portion of the side support portion;

[0013] The flange portion is connected to the edge portion of the antenna cover through an adhesive film; the top buffer film is located in the cavity formed by the main support portion and the side support portion, and the top buffer film is connected to the central portion of the antenna cover.

[0014] According to one embodiment of the present disclosure, the liquid crystal phased array antenna includes a top glass substrate and a bottom glass substrate that are stacked;

[0015] The top glass substrate is connected to the antenna cover through the top buffer film;

[0016] The bottom glass substrate is connected to the main support portion through the bottom buffer film, wherein the side surfaces of the top glass substrate and the bottom glass substrate are both connected to the side support portion through the side buffer film.

[0017] According to an embodiment of the present disclosure, the liquid crystal flat panel phased array portable station further includes:

[0018] A polarization grid is detachably connected to the antenna cover.

[0019] According to an embodiment of the present disclosure, a magnet is provided on the polarization grid, and the polarization grid is adsorbed on the antenna cover through the magnet.

[0020] According to one embodiment of the present disclosure, the support structure further includes:

[0021] The fixing part is connected to the feed rod in a detachable manner.

[0022] According to an embodiment of the present disclosure, the feed rod includes a fastening flange and a sealing and clamping structure; the fixing portion has a supporting boss, and the supporting boss is provided with an external thread; the sealing and clamping structure includes a connecting section and a constraining end;

[0023] The connecting section has a threaded hole;

[0024] The constraint section has a constraint hole that is coaxial with and connected to the threaded hole; the diameter of the threaded hole is larger than the diameter of the constraint hole, so that a clamping step is formed on the side of the constraint section close to the connecting section; the feed rod passes through the threaded hole and the constraint hole;

[0025] The connecting section is threadedly connected to the supporting boss so that the fastening flange is clamped by the end surface of the supporting boss and the pressing step.

[0026] According to an embodiment of the present disclosure, the liquid crystal flat panel phased array portable station further includes:

[0027] The internal sealing ring is sandwiched between the fastening flange and the end surface of the supporting boss.

[0028] According to an embodiment of the present disclosure, the connecting section further includes a butt-jointed flange; the liquid crystal flat panel phased array portable station further includes an external sealing ring sandwiched between the butt-jointed flange and the polarization grid.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of a liquid crystal flat panel phased array portable station in the first exemplary embodiment of the present disclosure.

[0032] Figure 2 This is a partial structural cross-sectional view of a liquid crystal flat panel phased array portable station in an exploded state in the first exemplary embodiment of the present disclosure.

[0033] Figure 3 This is a partial structural cross-sectional view of a liquid crystal flat panel phased array portable station in an installed state in the first exemplary embodiment of the present disclosure.

[0034] Figure 4 This is an exploded view of a liquid crystal flat panel phased array portable station in the first exemplary embodiment of the present disclosure.

[0035] Figure 5 It is a schematic diagram of the hidden part structure of the liquid crystal flat panel phased array portable station in the first exemplary embodiment of the present disclosure.

[0036] Figure 6 It is a partial structural diagram of a liquid crystal flat panel phased array portable station in the first exemplary embodiment of the present disclosure.

[0037] Figure 7 for Figure 6 Enlarged view of part A.

[0038] Description of reference numerals:

[0039] 1. Liquid crystal phased array antenna; 11. Top glass substrate; 12. Bottom glass substrate; 2. Support structure; 21. Main support part; 22. Side support part; 23. Flange part; 24. Fixing part; 241. Support boss; 3. Bottom buffer film; 4. Side buffer film; 5. Top buffer film; 6. Heating film; 7. Adhesive film; 8. Polarization grid; 81. Magnet; 82. External sealing ring; 83. Back cover; 84. Antenna cover; 85. Wave control board; 86. Control module; 9. Feed rod; 91. Fastening flange; 911. Internal sealing ring; 92. Sealing and clamping structure; 921. Connecting section; 9211. Threaded hole; 9212. Tightening flange; 922. Constraint section; 9221. Constraint hole. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0041] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0042] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0043] In the prior art, during the productization process of the liquid crystal flat panel phased array portable station, it is necessary to perform quality inspection on the liquid crystal flat panel phased array portable station being processed. Since the liquid crystal phased array antenna in the liquid crystal flat panel phased array portable station is mainly composed of PCB and thin glass as a substrate, when the liquid crystal flat panel phased array portable station product is inspected, there is a phenomenon that the thin glass is broken due to environmental tests such as impact and vibration.

[0044] Based on this, an embodiment of the present disclosure provides a liquid crystal flat panel phased array portable station.

[0045] See also Figure 4 and Figure 6 A liquid crystal flat-panel phased array portable station includes a liquid crystal phased array antenna 1, a supporting structure 2 and an antenna cover 84; the liquid crystal phased array antenna 1 includes a plurality of array-distributed liquid crystal antenna units, wherein the liquid crystal antenna units are arranged in an array according to a certain rule; the supporting structure 2 includes a main supporting portion 21 and a side supporting portion 22; the main supporting portion 21 is connected to the liquid crystal phased array antenna 1 through a bottom buffer film 3; the side supporting portion 22 is arranged around the main supporting portion 21, and the side of the liquid crystal phased array antenna 1 is connected to the side supporting portion 22 through a side buffer film 4; the antenna cover 84 is connected to the top surface of the liquid crystal phased array antenna 1 through a top buffer film 5.

[0046] The liquid crystal flat panel phased array portable station disclosed in the present invention connects the liquid crystal phased array antenna 1 to the main support portion 21 through the bottom buffer film 3; connects the liquid crystal phased array antenna 1 to the side support portion 22 through the side buffer film 4; and connects the antenna cover 84 to the top surface of the liquid crystal phased array antenna 1 through the top buffer film 5; thereby achieving reliable protection of the thin glass in the liquid crystal phased array antenna 1, reducing the phenomenon of the thin glass of the liquid crystal phased array antenna 1 being broken due to detection during the productization process of the liquid crystal flat panel phased array portable station, and reducing the damage to the product during the application stage of the liquid crystal flat panel phased array portable station.

[0047] In one embodiment of the present disclosure, the material of the top buffer film 5, the side buffer film 4 and the bottom buffer film 3 is foam. It should be noted that the material of the top buffer film 5, the side buffer film 4 and the bottom buffer film 3 is not limited to this, as long as it can protect the thin glass of the liquid crystal phased array antenna during the detection of the liquid crystal flat panel phased array portable station or during the application stage of the liquid crystal flat panel phased array portable station.

[0048] In another embodiment of the present disclosure, see Figure 4 and Figure 7 The liquid crystal flat-panel phased array portable station may further include a heating film 6, which is sandwiched between the bottom buffer film 3 and the liquid crystal phased array antenna 1. One side of the heating film 6 is attached to the bottom glass of the liquid crystal phased array antenna 1, and its main purpose is to heat the liquid crystal inside the liquid crystal phased array antenna 1 so that the liquid crystal can rise to the optimal operating temperature range in the fastest time without affecting the performance of the liquid crystal phased array antenna 1.

[0049] In the embodiment of the present disclosure, one side of the bottom buffer film 3 is connected to the heating film 6 by bonding, and the other side of the bottom buffer film 3 is connected to the main support part 21. Its main function is to provide shock absorption and impact protection in the plane direction of the liquid crystal flat-panel phased array portable station under the premise of supporting the thin glass of the liquid crystal phased array antenna 1. Among them, the side buffer film 4 is fixed to the surrounding of the side support part 22 by bonding, and is located on the inner wall of the cavity formed by the side support part 22 and the main support part 21. Its purpose is to protect the narrow edge of the thin glass of the liquid crystal phased array antenna 1 from impact and vibration, and the bottom buffer film 3 and the side buffer film 4 cooperate with each other to achieve reliable protection of the liquid crystal phased array antenna 1.

[0050] In another embodiment of the present disclosure, see Figure 6 The support structure 2 may also include a flange portion 23 located at the end of the side support portion 22; the flange portion 23 is connected to the edge portion of the antenna cover 84 by a glue film 7; the top buffer film 5 is located in the cavity formed by the main support portion 21 and the side support portion 22, and the top buffer film 5 is connected to the central portion of the antenna cover 84. The flange portion 23 is connected to the edge portion of the antenna cover 84 by a glue film 7, which, on the one hand, realizes the fixation of the flange portion 23 and the edge portion of the antenna cover 84, and on the other hand, is connected by the glue film 7, which enables the flange portion 23 and the antenna cover 84 to fit closely, and can realize the sealing of the flange portion 23 and the edge portion of the antenna cover 84, thereby improving the sealing effect of the liquid crystal flat panel phased array portable station.

[0051] In one embodiment of the present disclosure, see Figure 6 and Figure 7 The liquid crystal phased array antenna 1 includes a top glass substrate 11 and a bottom glass substrate 12 which are stacked; the top glass substrate 11 is connected to the antenna cover 84 through a top buffer film 5; the bottom glass substrate 12 is connected to the main support portion 21 through a bottom buffer film 3, wherein the sides of the top glass substrate 11 and the bottom glass substrate 12 are connected to the side support portion 22 through a side buffer film 4. At the same time, the liquid crystal phased array antenna 1 also includes a PCB board, which is arranged between the top glass substrate 11 and the top buffer film 5.

[0052] In one embodiment of the present disclosure, the liquid crystal flat panel phased array portable station further includes a polarization grid 8, which is detachably connected to the antenna cover 84. The function of the polarization grid 8 is to rotate the circular polarization of the electromagnetic wave from left to right, or from right to left. When the polarization direction of the circular polarization needs to be converted, the polarization grid 8 only needs to be rotated 90° and then fit with the antenna cover 84.

[0053] In one example of this implementation, see Figure 4 and Figure 5A magnet 81 is provided on the polarization grid 8, and the polarization grid 8 is adsorbed on the antenna cover 84 through the magnet 81. In the embodiment of the present disclosure, the polarization grid 8 is connected to the antenna cover 84 through the magnet 81, so that the polarization grid 8 can still maintain a close contact with the antenna cover 84 after the polarization grid 8 rotates, thereby realizing the connection between the polarization grid 8 and the antenna cover 84.

[0054] It should be noted that, in the embodiment of the present disclosure, the polarization grid 8 is provided with a magnet 81 to realize a detachable connection between the polarization grid 8 and the antenna cover 84, which is one embodiment of the embodiment of the present disclosure, but the connection method between the polarization grid 8 and the antenna cover 84 is not limited thereto. Of course, the polarization grid 8 and the antenna cover 84 can also be connected by bolts. For example, when the position of the polarization grid 8 needs to be adjusted, the bolts are loosened, and a rotation gap is left between the polarization grid 8 and the antenna cover 84. The position of the polarization grid 8 on the antenna cover 84 is adjusted. After the polarization grid 8 is rotated to a suitable position, the polarization grid 8 is fixed to the antenna cover 84 with bolts. During the polarization conversion process, the feed rod 9 also needs to be rotated 90° while the polarization grid 8 rotates.

[0055] In another embodiment of the present disclosure, see Figure 2 and Figure 3 The support structure 2 also includes a fixing portion 24, and the feed rod 9 is detachably connected to the fixing portion 24. The function of the feed rod 9 is to radiate the power from the feed line to the reflective surface in the form of electromagnetic waves, so that it produces a suitable field distribution on the radiation aperture to form the required beam, while minimizing the power leaking out from the edge of the reflective surface.

[0056] In one example of this implementation, a square groove is provided on the fixing portion 24, and the feed rod 9 extends into the square groove of the fixing portion 24, thereby improving the installation strength between the feed rod 9 and the support structure 2, thereby improving the sealing of the liquid crystal flat panel phased array portable station to a certain extent. It should be noted that the shape of the groove provided on the fixing portion 24 in the present application is not limited to this.

[0057] In another example of this embodiment, see Figure 2 , Figure 3The feed rod 9 includes a fastening flange 91 and a sealing and clamping structure 92; the fixing portion 24 has a supporting boss 241, and the supporting boss 241 is provided with an external thread; the sealing and clamping structure 92 includes a connecting section 921 and a restraining section 922; the connecting section 921 has a threaded hole 9211; the restraining section 922 has a restraining hole 9221 which is coaxial with and connected to the threaded hole 9211; the diameter of the threaded hole 9211 is larger than the diameter of the restraining hole 9221, so that a clamping step is formed on the side of the restraining section 922 close to the connecting section 921; the feed rod 9 passes through the threaded hole 9211 and the restraining hole 9221; the connecting section 921 is threadedly connected to the supporting boss 241, so that the fastening flange 91 is clamped by the end face and the clamping step of the supporting boss 241.

[0058] In the embodiment of the present disclosure, the fastening flange 91 can be an integrated truncated cone structure, or it can be a form in which a plurality of protrusions are evenly distributed along the circumference of the feed rod 9, but the fastening flange 91 is not limited thereto. As long as the fastening flange 91 and the end face of the fixing portion 24 can be tightly pressed against each other to improve the sealing effect of the liquid crystal flat panel phased array portable station, it will be sufficient.

[0059] In one example of this implementation, see Figure 2 and Figure 3 The liquid crystal flat panel phased array portable station also includes an internal sealing ring 911, which is sandwiched between the end faces of the fastening flange 91 and the supporting boss 241. By arranging the internal sealing ring 911 at the connection between the fastening flange 91 and the supporting boss 241, the connection between the fastening flange 91 and the supporting boss 241 is made tighter, so that while the connection strength between the fastening flange 91 and the supporting boss 241 is improved, the sealing effect of the fastening flange 91 and the supporting boss 241 is also improved accordingly. The sealing compression structure 92 is connected to the supporting structure 2 through a thread, so as to realize the compression between the feed rod 9, the supporting structure 2 and the internal sealing ring 911, realize the sealing of the feed rod 9, the supporting structure 2 and the internal sealing ring 911, and also facilitate the polarization conversion of the feed rod 9.

[0060] Optionally, the internal sealing ring 911 can be made of rubber, asbestos, or a mixture of rubber and asbestos. The internal sealing ring 911 can also be made of stainless steel or low-carbon steel. It should be noted that in the embodiments of the present disclosure, the material of the internal sealing ring 911 is not limited thereto.

[0061] In one example of this implementation, see Figure 2 and Figure 3, the connecting section 921 also includes a tightening flange 9212. The tightening flange 9212 is arranged on the outer peripheral side of the connecting section 921. The liquid crystal flat panel phased array portable station also includes an external sealing ring 82, and the external sealing ring 82 is clamped between the tightening flange 9212 and the polarization grid 8. When the liquid crystal flat panel phased array portable station is in a sealed state, the sealing and clamping structure 92 presses the external sealing ring 82 on the polarization grid 8 to achieve indirect sealing between the sealing and clamping structure 92 and the polarization grid 8. At the same time, the sealing and clamping structure 92 is connected to the fixing part 24 by a threaded connection. Such a threaded clamping method can improve the sealing effect of the liquid crystal flat panel phased array portable station on the one hand, and on the other hand, improve the convenience of switching the feed rod 9.

[0062] Optionally, the abutting flange 9212 may be an integrated truncated cone structure, or may be a form in which a plurality of protrusions are evenly distributed along the circumference of the connecting section 921, but the abutting flange 9212 is not limited thereto. In the disclosed embodiment, the orthographic projection of the fastening flange 91 on the polarization grid 8 is located within the orthographic projection of the abutting flange 9212 on the polarization grid 8.

[0063] Similarly, the outer sealing ring 82 can be made of rubber, asbestos, or a mixture of rubber and asbestos. Meanwhile, the inner sealing ring 911 can also be made of stainless steel or low-carbon steel. It should be noted that in the disclosed embodiment, the material of the outer sealing ring 82 is not limited thereto.

[0064] In one embodiment of the present disclosure, see Figure 1 and Figure 4 The portable station for liquid crystal flat panel phased array may further include a rear cover 83, which is fixed to the side of the support structure 2 away from the polarization grid 8 by means of an adhesive film 7. Optionally, a heat dissipation tooth may be provided on the rear cover 83, and the heat generated by the portable station for liquid crystal flat panel phased array may be dissipated on the heat dissipation tooth. The drawings of this specification do not specifically show this structure. At the same time, an air cooling structure may also be provided on the rear cover 83, and the air cooling structure may be driven to achieve zero heat dissipation when the portable station for liquid crystal flat panel phased array is working.

[0065] In one embodiment of the present disclosure, see Figure 4 The liquid crystal flat panel phased array portable station may also include a control module 86, which includes but is not limited to filters, amplifiers, frequency converters, modulators / demodulators, oscillators, synthesizers, digital-to-analog converters, signal coupling (power dividers, combiners, attenuators, power detectors), and the like.

[0066] In one embodiment of the present disclosure, see Figure 4 The liquid crystal flat panel phased array portable station may further include a wave control board 85; the wave control board 85 is disposed between the support structure 2 and the control module 86, and the function of the wave control board 85 is to control the phase of the antenna.

[0067] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A liquid crystal flat panel phased array portable station, comprising: A liquid crystal phased array antenna, comprising a plurality of liquid crystal antenna units distributed in an array; A support structure, comprising a main support portion and a side support portion; The main support part is connected to the liquid crystal phased array antenna through a bottom buffer film; the side support part is arranged around the main support part, and the side of the liquid crystal phased array antenna is connected to the side support part through a side buffer film; The antenna cover is connected to the top surface of the liquid crystal phased array antenna through a top buffer film.

2. The liquid crystal flat panel phased array portable station according to claim 1, characterized in that: The top buffer film, the side buffer film and the bottom buffer film are made of foam.

3. The liquid crystal flat panel phased array portable station according to claim 1, characterized in that: The liquid crystal flat panel phased array portable station also includes: The heating film is sandwiched between the bottom buffer film and the liquid crystal phased array antenna.

4. The liquid crystal flat panel phased array portable station according to claim 1, characterized in that: The support structure further includes a flange portion located at an end of the side support portion; The flange portion is connected to the edge portion of the antenna cover through an adhesive film; the top buffer film is located in the cavity formed by the main support portion and the side support portion, and the top buffer film is connected to the central portion of the antenna cover.

5. The liquid crystal flat panel phased array portable station according to claim 1, characterized in that: The liquid crystal phased array antenna comprises a top glass substrate and a bottom glass substrate which are stacked; The top glass substrate is connected to the antenna cover through the top buffer film; The bottom glass substrate is connected to the main support portion through the bottom buffer film, wherein the side surfaces of the top glass substrate and the bottom glass substrate are both connected to the side support portion through the side buffer film.

6. The liquid crystal flat panel phased array portable station according to claim 1, characterized in that: The liquid crystal flat panel phased array portable station also includes: A polarization grid is detachably connected to the antenna cover.

7. The liquid crystal flat panel phased array portable station according to claim 6, characterized in that: The polarization grid is provided with a magnet, and the polarization grid is adsorbed on the antenna cover through the magnet.

8. The liquid crystal flat panel phased array portable station according to claim 6, characterized in that: The support structure also includes: The fixing part is connected to the feed rod in a detachable manner.

9. The liquid crystal flat panel phased array portable station according to claim 8, characterized in that: The feed rod comprises a fastening flange and a sealing and pressing structure; the fixing portion comprises a supporting boss, and the supporting boss is provided with an external thread; the sealing and pressing structure comprises a connecting section and a restraining section; The connecting section has a threaded hole; The constraint section has a constraint hole that is coaxial with and connected to the threaded hole; the diameter of the threaded hole is larger than the diameter of the constraint hole, so that a clamping step is formed on the side of the constraint section close to the connecting section; the feed rod passes through the threaded hole and the constraint hole; The connecting section is threadedly connected to the supporting boss so that the fastening flange is clamped by the end surface of the supporting boss and the pressing step.

10. The liquid crystal flat panel phased array portable station according to claim 9, characterized in that: The liquid crystal flat panel phased array portable station also includes: The internal sealing ring is sandwiched between the fastening flange and the end surface of the supporting boss.

11. The liquid crystal flat panel phased array portable station according to claim 9, characterized in that: The connecting section further comprises a butting flange; the liquid crystal flat panel phased array portable station further comprises an external sealing ring sandwiched between the butting flange and the polarization grid.

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