Isolator and implementation method thereof

Abstract

The invention discloses an isolator, comprising a shell, wherein a positioning ring, a lower permanent magnet, a lower uniform magnetic sheet, a lower ferrite, a central conductor, an upper ferrite, a hexagonal uniform magnetic sheet, an upper permanent magnet, a temperature compensation sheet and an upper uniform magnetic sheet are arranged in sequence inside the shell from bottom to top, a cover plate is connected to the top of the shell, the central conductor comprises three central junctions which are mutually 120 degrees, a longitudinal gap is arranged along the central line of the central junction, and a first transverse gap and a second transverse gap which intersect with the longitudinal gap respectively are arranged on the central junction, and the second transverse gap is located outside the first transverse gap; the invention also discloses an implementation method of the isolator, wherein the invention adds a part of coupling circuit to the oscillation circuit of the central junction part, increases the internal field strength, reduces the third-order intermodulation, and improves the signal quality; the extension foot of the hexagonal uniform magnetic sheet of the invention is welded to the groove wall of the corresponding groove, reduces the components through which the circuit flows, and significantly reduces the insertion loss.

Description

Technical Field

[0001] The invention belongs to the technical field of isolators, and in particular relates to an isolator and an implementation method thereof. Background Art

[0002] With the rapid development of the information age, high-frequency communication equipment such as mobile phones and communication base stations have become a necessity for people. With the application of 5G technology, there are higher requirements for the miniaturization, low cost and performance stability of hardware equipment. The design of circulators and isolators used in these devices is also becoming increasingly miniaturized, low-cost and performance-stable.

[0003] In the high field area and wide operating frequency band, low insertion loss and low third-order intermodulation have become the more important indicators of isolators or circulators.

[0004] Therefore, there is an urgent need for an isolator or circulator to improve and reduce the insertion loss and third-order intermodulation of the circulator or isolator, so as to improve the quality of communication signals. Summary of the invention

[0005] The object of the present invention is to provide an isolator to solve the problems mentioned in the above background technology. The isolator provided by the present invention has the characteristics of improving and reducing the insertion loss and third-order intermodulation of a circulator or isolator, and improving the quality of communication signals.

[0006] Another object of the present invention is to provide a method for realizing an isolator.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an isolator, comprising a shell, the interior of which is provided with a positioning ring, a lower permanent magnet, a lower uniform magnetic sheet, a lower ferrite, a central conductor, an upper ferrite, a hexagonal uniform magnetic sheet, an upper permanent magnet, a temperature compensation sheet and an upper uniform magnetic sheet from bottom to top, and a cover plate is connected to the top of the shell.

[0008] In order to increase the internal field strength, reduce the third-order intermodulation, and improve the signal quality, the present invention further comprises three center conductors which are at an angle of 120 degrees to each other, the center junction is provided with a longitudinal slot along its center line, and the center junction is also provided with a first transverse slot and a second transverse slot which intersect with the longitudinal slot respectively, the second transverse slot is located outside the first transverse slot, the widths of the first transverse slot, the second transverse slot and the longitudinal slot are all 0.1-1.0 mm, the first transverse slot and the second transverse slot are arc structures which are concentric with the arc-shaped outer edge of the center junction, and the center conductor is a thin sheet structure of oxygen-free copper or phosphor copper.

[0009] In order to improve the inductive reactance and thus achieve impedance matching, in the present invention, the center conductor further includes a center node branch node connected to the centers of the three center nodes and forming an angle of 120 degrees with each other, the center node branch node is connected to a center node branch node extension foot, and an angle is provided between the center node branch node and the center node branch node extension foot, the center node branch node extension foot is provided with a through hole, and the metal terminal is connected in the through hole.

[0010] In order to reduce the number of components through which the circuit flows and reduce insertion loss, the present invention further provides that the hexagonal uniform magnetic plate has six extension feet in a circular array on its circumference, the shell is provided with three grooves in a circular array, and the extension feet are welded to the groove walls of the corresponding grooves.

[0011] In the present invention, the method for implementing the isolator further comprises the following steps:

[0012] (1) Place the positioning ring, the lower permanent magnet, the lower uniform magnetic sheet and the lower ferrite into the housing in sequence;

[0013] (ii) Weld the three metal terminals to the center junction and branch junction extension legs respectively, and then place the center conductor into the housing so that the three center junction and branch junction extension legs are respectively located in the grooves of the housing;

[0014] (3) Place the upper ferrite, hexagonal uniform magnetic sheet, upper permanent magnet, temperature compensation sheet and upper uniform magnetic sheet into the housing in sequence;

[0015] (iv) Place the cover plate on top of the shell, allow the column at the top of the shell to pass through the notch on the cover plate, and bend the column at the top of the shell to complete the packaging;

[0016] (V) Weld the six extension legs to the corresponding groove walls respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adds a coupling circuit to the oscillation circuit of the central junction part, thereby increasing the internal field strength, reducing the third-order intermodulation, and improving the signal quality;

[0019] 2. The larger the widths of the first transverse gap, the second transverse gap and the longitudinal gap provided in the present invention are, the more obvious the improvement of the internal field strength is;

[0020] 3. Each center node branch node of the present invention forms different angles with the two adjacent center nodes, which solves the problem that the first transverse gap, the second transverse gap and the longitudinal gap provided on the center node increase the internal field strength, but the inductive reactance becomes smaller, resulting in impedance mismatch;

[0021] 4. The angle between the center node branch and the center node branch extension leg of the present invention increases the length of this line, and improves the inductive reactance to achieve impedance matching without changing the center node width;

[0022] 5. The hexagonal uniform magnetic plate of the present invention has six extended legs in a circular array on its circumference, and the extended legs are welded to the groove wall of the corresponding groove, so that after one branch of the oscillation circuit passes through the central conductor, it only needs to flow through the ferrite to reach the hexagonal uniform magnetic plate. Because the hexagonal uniform magnetic plate is welded to the shell, it is equivalent to direct grounding, reducing the components through which the circuit flows. Since the more components the circuit flows through, the greater the cumulative loss generated, the present application significantly reduces the insertion loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure explosion of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the hexagonal magnetic shim of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the housing of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the central conductor of the present invention;

[0028] Figure 6 This is a comparison diagram of the third-order intermodulation between the present invention and the prior art.

[0029] In the figure: 1, cover plate; 2, upper uniform magnetic plate; 3, temperature compensation plate; 4, upper permanent magnet; 5, hexagonal uniform magnetic plate; 51, extension foot; 6, upper ferrite; 7, center conductor; 71, center junction; 711, first horizontal gap; 712, second horizontal gap; 713, longitudinal gap; 72, center junction branch; 73, center junction branch extension foot; 8, lower ferrite; 9, lower uniform magnetic plate; 10, lower permanent magnet; 11, positioning ring; 12, shell; 121, slot wall; 13, metal terminal. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1-6 The present invention provides the following technical solutions: an isolator, comprising a shell 12, wherein the interior of the shell 12 is provided with a positioning ring 11, a lower permanent magnet 10, a lower uniform magnetic sheet 9, a lower ferrite 8, a central conductor 7, an upper ferrite 6, a hexagonal uniform magnetic sheet 5, an upper permanent magnet 4, a temperature compensation sheet 3 and an upper uniform magnetic sheet 2 from bottom to top, and a cover plate 1 is connected to the top of the shell 12.

[0033] Specifically, the center conductor 7 includes three center nodes 71 at an angle of 120 degrees to each other. The center node 71 is provided with a longitudinal slit 713 along its center line, and the center node 71 is also provided with a first transverse slit 711 and a second transverse slit 712 respectively intersecting with the longitudinal slit 713. The second transverse slit 712 is located on the outside of the first transverse slit 711. The widths of the first transverse slit 711, the second transverse slit 712 and the longitudinal slit 713 are all 0.1-1.0 mm. The first transverse slit 711 and the second transverse slit 712 are arc structures concentric with the arc-shaped outer edge of the center node 71. The center conductor 7 is a thin sheet structure of oxygen-free copper or phosphor copper.

[0034] By adopting the above technical solution, a part of coupling circuit is added to the oscillation circuit of the central node 71, which increases the internal field strength, reduces the third-order intermodulation, and improves the signal quality; the larger the width of the first horizontal gap 711, the second horizontal gap 712 and the longitudinal gap 713, the more obvious the improvement of the internal field strength, and the preferred embodiment is 0.5mm.

[0035] like Figure 6 As shown in the figure, the solid rectangular frame is the third-order intermodulation data of 5 circulator products in the prior art, and the dotted rectangular frame is the third-order intermodulation data of 5 circulator products of the present invention. Figure 6 It can be clearly seen that the present invention significantly reduces third-order intermodulation compared to the circulator products in the prior art.

[0036] Example 2

[0037] The present embodiment is different from the embodiment 1 in that: specifically, the center conductor 7 also includes a center node branch node 72 which is centrally connected to the three center nodes 71 and is at an angle of 120 degrees to each other, the center node branch node 72 is connected to a center node branch node extension foot 73, and an angle is provided between the center node branch node 72 and the center node branch node extension foot 73, the angle is 0-180 degrees, and is preferably 120 degrees in the present embodiment, and a through hole is provided on the center node branch node extension foot 73, and the metal terminal 13 is connected in the through hole.

[0038] By adopting the above technical solution, each center node branch node 72 forms an unequal angle with the two adjacent center nodes 71, thereby solving the problem that the first transverse gap 711, the second transverse gap 712 and the longitudinal gap 713 provided on the center node 71 increase the internal field strength, but the inductive reactance becomes smaller, resulting in impedance mismatch.

[0039] Furthermore, the angle between the center node branch 72 and the center node branch extension leg 73 increases the length of this line, thereby increasing the inductive reactance and achieving impedance matching without changing the width of the center node 71 .

[0040] Example 3

[0041] The present embodiment is different from the first embodiment in that: specifically, the hexagonal uniform magnetic plate 5 has six extension legs 51 in a circular array on its circumference, the housing 12 is provided with three grooves in a circular array, and the extension legs 51 are welded to the groove walls 121 of the corresponding grooves.

[0042] By adopting the above-mentioned technical solution, after one branch of the oscillation circuit passes through the central conductor 7, it only needs to flow through the ferrite to reach the hexagonal uniform magnetic plate 5. Since the hexagonal uniform magnetic plate 5 is welded to the shell 12, it is equivalent to direct grounding, reducing the components through which the circuit flows. Since the more components the circuit flows through, the greater the cumulative loss, the present application significantly reduces the insertion loss.

[0043] Furthermore, a method for implementing an isolator according to the present invention comprises the following steps:

[0044] (i) Place the positioning ring 11, the lower permanent magnet 10, the lower magnetic plate 9 and the lower ferrite 8 into the housing 12 in sequence;

[0045] (ii) Weld the three metal terminals 13 to the center junction extension legs 73 respectively, and then place the center conductor 7 into the housing 12 so that the three center junction extension legs 73 are respectively located in the grooves of the housing 12;

[0046] (iii) placing the upper ferrite 6, the hexagonal uniform magnetic sheet 5, the upper permanent magnet 4, the temperature compensation sheet 3 and the upper uniform magnetic sheet 2 into the housing 12 in sequence;

[0047] (iv) The cover plate 1 is placed on top of the housing 12, so that the column at the top of the housing 12 passes through the notch on the cover plate 1, and the column at the top of the housing 12 is bent to complete the packaging;

[0048] (V) Weld the six extension legs 51 to the corresponding groove walls 121 .

[0049] In summary, the present invention adds a part of coupling circuit to the oscillation circuit of the center node 71, increases the internal field strength, reduces the third-order intermodulation, and improves the signal quality; the larger the width of the first horizontal gap 711, the second horizontal gap 712, and the longitudinal gap 713 set in the present invention, the more obvious the improvement of the internal field strength; each center node branch node 72 of the present invention forms an unequal angle with the two adjacent center nodes 71, which solves the problem that the first horizontal gap 711, the second horizontal gap 712, and the longitudinal gap 713 set on the center node 71 increase the internal field strength, but the inductive reactance will become smaller, resulting in impedance mismatch; the center node branch node 72 of the present invention The angle set between the extension pin 73 of the center node branch node increases the length of this line, and without changing the width of the center node 71, the inductive reactance is improved to achieve impedance matching; the hexagonal uniform magnetic plate 5 of the present invention has six extension pins 51 in a ring array on the circumference, and the extension pin 51 is welded to the groove wall 121 of the corresponding groove, so that after a branch of the oscillation circuit passes through the center conductor 7, it only needs to flow through the ferrite to reach the hexagonal uniform magnetic plate 5. Because the hexagonal uniform magnetic plate 5 is welded to the shell 12, it is equivalent to direct grounding, reducing the components through which the circuit flows. Since the more components the circuit flows through, the greater the cumulative loss, the present application significantly reduces the insertion loss.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An isolator, comprising a housing, characterized in that: The inside of the shell is provided with a positioning ring, a lower permanent magnet, a lower uniform magnetic sheet, a lower ferrite, a central conductor, an upper ferrite, a hexagonal uniform magnetic sheet, an upper permanent magnet, a temperature compensation sheet and an upper uniform magnetic sheet in sequence from bottom to top, and a cover plate is connected to the upper part of the shell, wherein the central conductor includes three central nodes which are 120 degrees apart from each other, and the central node is provided with a longitudinal gap along its center line, and the central node is also provided with a first transverse gap and a second transverse gap which intersect with the longitudinal gap respectively, and the second transverse gap is located outside the first transverse gap; The central conductor is a thin sheet structure of oxygen-free copper or phosphor copper; The hexagonal magnetic shim has six extension legs in a circular array on its circumference; The shell is provided with three grooves in an annular array, and the extension legs are welded to the groove walls of the corresponding grooves; The central conductor also includes a central junction branch node connected to the three central junctions and forming an angle of 120 degrees with each other; The central knot branch knot is connected to a central knot branch knot extension foot, and an angle is provided between the central knot branch knot and the central knot branch knot extension foot; Each center knot branch knot forms an unequal angle with the two adjacent center knots.

2. An isolator according to claim 1, characterized in that: The widths of the first transverse slit, the second transverse slit and the longitudinal slit are all 0.1-1.0 mm.

3. An isolator according to claim 1, characterized in that: The first transverse gap and the second transverse gap are arc structures that are concentric with the arc-shaped outer edge of the center knot.

4. An isolator according to claim 1, characterized in that: The central node branch node extension legs are provided with through holes, and the metal terminals are connected in the through holes.

5. The method for implementing an isolator according to claim 4, characterized in that: The following steps are involved: (i) Place the positioning ring, lower permanent magnet, lower uniform magnetic sheet and lower ferrite into the housing in sequence; (ii) Weld the three metal terminals to the center junction extension legs respectively, and then place the center conductor into the housing so that the three center junction extension legs are respectively located in the grooves of the housing; (3) Place the upper ferrite, hexagonal uniform magnetic sheet, upper permanent magnet, temperature compensation sheet and upper uniform magnetic sheet into the housing in sequence; (iv) Place the cover plate on top of the shell, allow the column at the top of the shell to pass through the notch on the cover plate, and bend the column at the top of the shell to complete the packaging; (V) Weld the six extension legs to the corresponding groove walls respectively.

Images