Miniaturized center junction and circulator

Abstract

The invention relates to a miniaturized central junction, comprising an integrally formed resonant resistor, a loop inductor and a matching capacitor, wherein the loop inductor is connected to the matching capacitor, and the resonant resistor is arranged between adjacent loop inductors; the resonant resistor comprises a connecting section and an arc-shaped outward expansion section, wherein the outer diameter of the arc-shaped outward expansion section is greater than that of the connecting section and the two sides of the arc-shaped outward expansion section are arranged obliquely; the matching capacitor comprises: a main substrate and auxiliary substrates arranged on both sides of the main substrate, wherein the main substrate is provided with through holes, and the outer ends of one of the main substrates are arranged in an arc shape; through the structure and size selection of the central junction of the invention, the problems of poor performance indicators and poor consistency of small-sized isolators and circulators are solved, insertion loss, intermodulation performance and working bandwidth are optimized, and the cost is low, system indicator requirements can be met more efficiently, stability is good, and batch manufacturability is strong.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave and radio frequency communication devices, and in particular to a miniaturized central junction and a circulator. Background Art

[0002] With the rapid development of 4G and 5G technologies, the miniaturization and high performance of circulators and isolators have become the current development trend. Due to the narrow design range and complex processing of the center junction, it is difficult to design small sizes in the past and it is difficult to meet the current usage needs. Therefore, it is necessary to provide a miniaturized center junction to meet the current requirements for product performance and provide a new solution for 5G miniaturization. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a miniaturized central junction and a circulator, which solves the problems of poor performance indicators and poor consistency of small-sized circulators.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A miniaturized center junction comprises an integrally formed resonant resistor, a loop inductor and a matching capacitor, wherein the resonant resistor, the loop inductor and the matching capacitor are all arranged in three groups in the form of a ring array, the loop inductor is connected to the matching capacitor, and the resonant resistor is arranged between adjacent loop inductors; the resonant resistor comprises a connecting section and an arc-shaped outward expansion section, the outer diameter of the arc-shaped outward expansion section is larger than that of the connecting section and the two sides of the arc-shaped outward expansion section are arranged obliquely; the matching capacitor comprises: a main substrate and auxiliary substrates arranged on both sides of the main substrate, the main substrate is provided with a through hole, and the outer end of one of the main substrates is arranged in an arc shape;

[0006] The angle between the two sides of the arc-shaped expansion section is 67.9°-71.4°, the radius is 3.35-3.85 mm, the width of the connecting section is 2.65-2.85 mm, and the distance between the end of the connecting section and the center point of the center node is 2.5-2.91 mm;

[0007] The width of the loop inductor is 0.49-0.65 mm;

[0008] The width of the main substrate is 1.17-1.23 mm, and the radius of the through hole is 0.26-0.32 mm.

[0009] As a preferred solution of the present invention, the angle between the two sides of the arc-shaped expansion section is 71.31°, the radius is 3.38 mm, the width of the connecting section is 2.8 mm, and the distance between the end of the connecting section and the center point of the center node is 2.53 mm.

[0010] As a preferred solution of the present invention, a transition notch is arranged between the connecting section and the arc-shaped outward expansion section, and a bevel edge is arranged between the transition notch and the connecting section; the spacing between the end of the connecting section and the outer end of the bevel edge is 0.49 mm, the spacing between the outer end of the bevel edge and the center point of the center node is 2.04 mm, the width of the connecting section at the transition notch is 2.1 mm, and the angle formed between the two bevel edges is 105.71°.

[0011] As a preferred solution of the present invention, the widths of the three loop inductors are 0.59 mm, 0.59 mm and 0.62 mm respectively.

[0012] As a preferred embodiment of the present invention, the inner side surface of the auxiliary substrate is provided with a first bevel and a second bevel connected to each other, the outer side surface of the auxiliary substrate is provided with a third bevel and a fourth bevel connected to each other, and an outer notch is provided between the main substrate and the auxiliary substrate; the width of the main substrate is 1.2 mm, the spacing between the outer ends of the two auxiliary substrates is 2.11 mm, the angle between the first bevels is 116.63°, the angle between the third bevels is 116.63°, the radius of the third bevel is 3.68 mm, and the fourth bevel is 1.2 mm. The radius of the edge is 4.02mm, the width of the main substrate with the arc-shaped edge is 1.12mm, the spacing between the outer ends of the secondary substrates with the arc-shaped edge is 2.15mm, the spacing between the inner end of the main substrate and the center point of the center node is 3.76mm, the spacing between the outer end of the outer recess and the center point of the center node is 4.49mm, the spacing between the inner end of the outer recess and the center point of the center node is 4.11mm, the radius of the through hole is 0.29mm, and the radius of the arc-shaped edge of the main substrate is 0.6mm.

[0013] As a preferred solution of the present invention, the angle between the two sides of the arc-shaped expansion section is 68°, the radius is 3.82 mm, the width of the connecting section is 2.7 mm, and the distance between the end of the connecting section and the center point of the center node is 2.88 mm.

[0014] As a preferred solution of the present invention, the widths of the three loop inductors are 0.52 mm, 0.52 mm and 0.53 mm respectively.

[0015] As a preferred embodiment of the present invention, a fifth hypotenuse and a transition arc edge connected to each other are provided between the auxiliary substrate and the main substrate, and a transition fillet is provided at the inner end of the auxiliary substrate; the width of the main substrate is 1.2mm, the angle between the outer ends of the two auxiliary substrates is 49°, the radius of the transition fillet is 0.15mm, the angle between the inner sides of the two auxiliary substrates is 120°, the spacing between the two auxiliary substrates facing the loop inductor is 1.27mm, the angle between the inner sides of the auxiliary substrates with arc edges is 146°, the radius of the transition arc edge is 3.96mm, the spacing between the outer ends of the auxiliary substrates with arc edges is 3.44mm, the spacing between the outer end of the fifth hypotenuse and the center point of the center node is 4.46mm, the spacing between the inner recess of the auxiliary substrate and the center point of the center node is 3.96mm, the radius of the through hole is 0.29mm, and the radius of the arc edge of the main substrate is 0.6mm.

[0016] As a preferred solution of the present invention, the central junction is made of copper or copper alloy, and a silver-plated layer is provided on the surface of the central junction.

[0017] On the other hand, the present invention also provides a circulator, comprising: a lower cavity, a center knot, and an upper cover, wherein the center knot is embedded in the lower cavity, and the upper cover is threadedly connected to the lower cavity and presses the center knot.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The embodiment of the present invention provides a miniaturized center junction and a circulator, wherein the resonant resistor determines the main resonant frequency and the main cutoff frequency of the circulator, and generates resonance, thereby reducing the influence of nonlinearity in a linear system. The loop inductor is used to store signals and forms an LC matching loop with the matching capacitor to provide capacitive matching, thereby optimizing the main resonant frequency and the main cutoff frequency, and also providing different impedances and bandwidths for the resonant frequency. Through the structure and size selection of the center junction of the present invention, the problems of poor performance indicators and poor consistency of small-sized isolators and circulators are solved, the insertion loss, intermodulation performance and working bandwidth are optimized, and the cost is low, the system indicator requirements can be met more efficiently, the stability is good, and the mass manufacturability is strong, and a suitable ohmic matching value is provided for the final performance of the circulator, so that its signals in the S band and C band of the communication system are stably performed, meeting the miniaturization requirements of 5G. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0022] Figure 2 Schematic diagram of the size and position of the resonant resistor in the first embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the size and position of the loop capacitor in the first embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the size and position of the matching capacitor in the first embodiment of the present invention.

[0025] Figure 5 It is a simulation curve diagram of the central junction performance of the first embodiment of the present invention.

[0026] Figure 6 This is a measured curve diagram of the central junction performance of Example 1 of the present invention.

[0027] Figure 7 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0028] Figure 8 Schematic diagram of the size and position of the resonant resistor in the second embodiment of the present invention.

[0029] Fig. 9 Schematic diagram of the size and position of the loop capacitor in the second embodiment of the present invention.

[0030] Fig.10 Schematic diagram of the size and position of the matching capacitor in the second embodiment of the present invention.

[0031] Fig.11 It is a simulation curve diagram of the central junction performance of the second embodiment of the present invention.

[0032] Fig.12 This is a measured curve diagram of the central knot performance of Example 2 of the present invention.

[0033] Fig.13 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0034] Fig.14 It is a structural diagram of embodiment 4 of the present invention.

[0035] The numbers and letters in the figure represent the corresponding component names:

[0036] 1. Lower cavity; 2. Center junction; 3. Upper cover; 4. Resonant resistor; 41. Connecting section; 42. Arc-shaped outward expansion section; 43. Transition notch; 44. Bevel edge; 5. Loop inductor; 6. Matching capacitor; 61. Main substrate; 62. Sub-substrate; 63. Through hole; 64. External notch. DETAILED DESCRIPTION

[0037] 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.

[0038] Embodiment 1

[0039] A miniaturized center knot 2, such as Figures 1 to 4 As shown, it includes an integrally formed resonant resistor 4, a loop inductor 5 and a matching capacitor 6, the resonant resistor 4, the loop inductor 5 and the matching capacitor 6 are all arranged in three groups in the form of a ring array, the loop inductor 5 is connected to the matching capacitor 6, and the resonant resistor 4 is arranged between adjacent loop inductors 5; the resonant resistor 4 includes a connecting section 41 and an arc-shaped outward expansion section 42, the outer diameter of the arc-shaped outward expansion section 42 is larger than the connecting section 41 and the two sides of the arc-shaped outward expansion section 42 are inclined; the matching capacitor 6 includes: a main substrate 61 and a sub-substrate 62 arranged on both sides of the main substrate 61, a through hole 63 is opened on the main substrate 61, and the outer end of one of the main substrates 61 is arranged in an arc shape.

[0040] Among them, the angle between the two sides of the arc-shaped outward expansion section 42 is 67.9°-71.4°, the radius is 3.35-3.85mm, the width of the connecting section 41 is 2.65-2.85mm, and the distance between the end of the connecting section 41 and the center point of the center node 2 is 2.5-2.91mm; the width of the loop inductor 5 is 0.49-0.65mm; the width of the main substrate 61 is 1.17-1.23mm, and the radius of the through hole 63 is 0.26-0.32mm.

[0041] Specifically, in the present embodiment, the angle 4-1 on both sides of the arc-shaped outward expansion section 42 is 71.31°, the radius 4-2 is 3.38 mm, the width 4-5 of the connecting section 41 is 2.8 mm, the distance between the end of the connecting section 41 and the center point of the center knot 2 is 2.53 mm, a transition recess 43 is provided between the connecting section 41 and the arc-shaped outward expansion section 42, and a miter edge 44 is provided between the transition recess 43 and the connecting section 41; the distance 4-3 between the end of the connecting section 41 and the outer end of the miter edge 44 is 0.49 mm, the distance 4-7 between the outer end of the miter edge 44 and the center point of the center knot 2 is 2.04 mm, the width 4-4 of the connecting section 41 at the transition recess 43 is 2.1 mm, and the angle 4-6 formed between the two miter edges 44 is 105.71°.

[0042] The widths of the three loop inductors 5 (5-1, 5-2, 5-3) are 0.59 mm, 0.59 mm, and 0.62 mm, respectively.

[0043] The inner side surface of the auxiliary substrate 62 is provided with a first bevel and a second bevel connected to each other, the outer side surface of the auxiliary substrate 62 is provided with a third bevel and a fourth bevel connected to each other, and an outer notch 64 is provided between the main substrate 61 and the auxiliary substrate 62; the width 6-1 of the main substrate 61 is 1.2 mm, the spacing 6-2 between the outer ends of the two auxiliary substrates 62 is 2.11 mm, the angle 6-3 between the first bevels is 116.63°, the angle 6-4 between the third bevels is 116.63°, the radius 6-6 of the third bevel is 3.68 mm, the radius 6-5 of the fourth bevel is 4.02 mm, and an arc is provided. The width 6-7 of the main substrate 61 of the edge is 1.12mm, the spacing 6-8 between the outer ends of the auxiliary substrate 62 with the arc-shaped edge is 2.15mm, the spacing 6-9 between the inner end of the main substrate 61 and the center point of the center node 2 is 3.76mm, the spacing 6-11 between the outer end of the outer recess 64 and the center point of the center node 2 is 4.49mm, the spacing 6-10 between the inner end of the outer recess 64 and the center point of the center node 2 is 4.11mm, the radius 6-12 of the through hole 63 is 0.29mm, and the radius 6-13 of the arc-shaped edge of the main substrate 61 is 0.6mm.

[0044] The center junction 2 is made of copper or copper alloy. In this embodiment, the center junction 2 is made of beryllium copper material, and a silver-plated layer is provided on the surface of the center junction 2 .

[0045] In this embodiment, the resonant resistor 4 determines the main resonant frequency and the main cutoff frequency of the circulator, and generates resonance, thereby reducing the influence of nonlinearity in the linear system. The loop inductor 5 is used to store signals and forms an LC matching loop with the matching capacitor 6 to provide capacitive matching, thereby optimizing the main resonant frequency and the main cutoff frequency, and also providing different impedances and bandwidths for the resonant frequency. Through the structure and size selection of the center junction 2 of the present invention, the problems of poor performance indicators and poor consistency of small-sized isolators and circulators are solved, the insertion loss, intermodulation performance and working bandwidth are optimized, and the cost is low, and the system indicator requirements can be met more efficiently. The stability is good, and the batch manufacturability is strong, and a suitable ohmic matching value is provided for the final performance of the circulator, so that the signals in the S band and C band of the communication system are stably performed, meeting the needs of 5G miniaturization. The frequency range applicable to the center junction of this embodiment is 3400MHz-3600MHz, and the size of the product can be reduced to 10mm*10mm.

[0046] like Figure 5 and Figure 6 The performance test curve of the product is shown, where: Figure 5 The isolation parameter is 25dB, the return loss parameter is 25dB, and the insertion loss parameter is 0.17dB. Figure 6 The Tr1 and Tr2 areas are return loss parameters, which are 26dB; the Tr3 area is the isolation parameter, which is 26dB; and the Tr4 area is the insertion loss parameter, which is 0.14dB.

[0047] Embodiment 2

[0048] The difference between this embodiment and other embodiments is that: in this embodiment, Figure 5-Figure 8 As shown, the angle 4-1 on both sides of the arc-shaped expansion section 42 is 68°, the radius 4-2 is 3.82 mm, the width 4-5 of the connecting section 41 is 2.7 mm, and the distance 4-8 between the end of the connecting section 41 and the center point of the center node 2 is 2.88 mm.

[0049] The widths of the three loop inductors 5 (5-1, 5-2, 5-3) are 0.52 mm, 0.52 mm, and 0.53 mm, respectively.

[0050] A fifth bevel and a transition arc edge are connected between the auxiliary substrate 62 and the main substrate 61, and a transition fillet is provided at the inner end of the auxiliary substrate 62; the width 6-1 of the main substrate 61 is 1.2 mm, the angle 6-14 between the outer ends of the two auxiliary substrates 62 is 49°, the radius 6-16 of the transition fillet is 0.15 mm, the angle 6-15 between the inner sides of the two auxiliary substrates 62 is 120°, the spacing 6-18 between the two auxiliary substrates 62 facing the loop inductor 5 is 1.27 mm, and the inner side of the auxiliary substrate 62 with an arc edge is provided. The angle 6-22 between them is 146°, the radius 6-17 of the transition arc edge is 3.96mm, the spacing 6-8 between the outer ends of the auxiliary substrate 62 with the arc edge is 3.44mm, the spacing 6-11 between the outer end of the fifth hypotenuse and the center point of the center node 2 is 4.46mm, the spacing 6-9 between the inner recess of the auxiliary substrate 62 and the center point of the center node 2 is 3.96mm, the radius 6-12 of the through hole 63 is 0.29mm, and the radius 6-13 of the arc edge of the main substrate 61 is 0.6mm.

[0051] The center junction of this embodiment is applicable to a frequency range of 2496MHz-2690MHz, and the size of the product can be reduced to 10mm*10mm.

[0052] like Fig.11 and Fig.12 The performance test curve of the product is shown, where: Fig.11 The isolation parameter is 25dB, the return loss parameter is 25dB, and the insertion loss parameter is 0.2dB. Fig.12 The Tr1 and Tr2 areas are return loss parameters, which are 26dB; the Tr3 area is the isolation parameter, which is 26dB; and the Tr4 area is the insertion loss parameter, which is 0.17dB.

[0053] Embodiment 3

[0054] A circulator, such as Fig.13 As shown, it includes: a lower cavity 1, a center knot 2 as described in the first embodiment, and an upper cover 3, the center knot 2 is embedded in the lower cavity 1, and the upper cover 3 is threadedly connected to the lower cavity 1 and presses the center knot 2.

[0055] Embodiment 4

[0056] A circulator, such as Fig.14 As shown, it includes: a lower cavity 1, a center knot 2 as described in the second embodiment, and an upper cover 3, the center knot 2 is embedded in the lower cavity 1, and the upper cover 3 is threadedly connected to the lower cavity 1 and presses the center knot 2.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A miniaturized center junction, characterized in that: The invention comprises an integrally formed resonant resistor, a loop inductor and a matching capacitor, wherein the resonant resistor, the loop inductor and the matching capacitor are all arranged in three groups in the form of a ring array, the loop inductor is connected to the matching capacitor, and the resonant resistor is arranged between adjacent loop inductors; the resonant resistor comprises a connecting section and an arc-shaped outward expansion section, the outer diameter of the arc-shaped outward expansion section is larger than that of the connecting section, and the two sides of the arc-shaped outward expansion section are arranged obliquely; the matching capacitor comprises: a main substrate and auxiliary substrates arranged on both sides of the main substrate, the main substrate is provided with a through hole, and the outer end of one of the main substrates is arranged in an arc shape; The angle between the two sides of the arc-shaped expansion section is 67.9°-71.4°, the radius is 3.35-3.85 mm, the width of the connecting section is 2.65-2.85 mm, and the distance between the end of the connecting section and the center point of the center node is 2.5-2.91 mm; The width of the loop inductor is 0.49-0.65 mm; The width of the main substrate is 1.17-1.23 mm, and the radius of the through hole is 0.26-0.32 mm.

2. The miniaturized center junction according to claim 1, characterized in that: The angle between the two sides of the arc-shaped outward expansion section is 71.31°, the radius is 3.38 mm, the width of the connecting section is 2.8 mm, and the distance between the end of the connecting section and the center point of the center node is 2.53 mm.

3. The miniaturized center junction according to claim 2, characterized in that: A transition notch is arranged between the connecting section and the arc-shaped outward expansion section, and a bevel edge is arranged between the transition notch and the connecting section; the spacing between the end of the connecting section and the outer end of the bevel edge is 0.49 mm, the spacing between the outer end of the bevel edge and the center point of the center node is 2.04 mm, the width of the connecting section at the transition notch is 2.1 mm, and the angle formed between the two bevel edges is 105.71°.

4. The miniaturized center junction according to claim 3, characterized in that: The widths of the three loop inductors are 0.59 mm, 0.59 mm and 0.62 mm respectively.

5. The miniaturized center junction according to claim 4, characterized in that: The inner side surface of the auxiliary substrate is provided with a first bevel and a second bevel connected to each other, the outer side surface of the auxiliary substrate is provided with a third bevel and a fourth bevel connected to each other, and an outer notch is provided between the main substrate and the auxiliary substrate; the width of the main substrate is 1.2 mm, the spacing between the outer ends of the two auxiliary substrates is 2.11 mm, the angle between the first bevels is 116.63°, the angle between the third bevels is 116.63°, the radius of the third bevel is 3.68 mm, and the radius of the fourth bevel is 4 .02mm, the width of the main substrate with arc-shaped edges is 1.12mm, the spacing between the outer ends of the auxiliary substrates with arc-shaped edges is 2.15mm, the spacing between the inner end of the main substrate and the center point of the center node is 3.76mm, the spacing between the outer end of the outer recess and the center point of the center node is 4.49mm, the spacing between the inner end of the outer recess and the center point of the center node is 4.11mm, the radius of the through hole is 0.29mm, and the radius of the arc-shaped edge of the main substrate is 0.6mm.

6. The miniaturized center junction according to claim 1, characterized in that: The angle between the two sides of the arc-shaped outward expansion section is 68°, the radius is 3.82 mm, the width of the connecting section is 2.7 mm, and the distance between the end of the connecting section and the center point of the center node is 2.88 mm.

7. The miniaturized center junction according to claim 6, characterized in that: The widths of the three loop inductors are 0.52 mm, 0.52 mm and 0.53 mm respectively.

8. The miniaturized center junction according to claim 6, characterized in that: A fifth bevel and a transition arc edge connected to each other are provided between the auxiliary substrate and the main substrate, and a transition fillet is provided at the inner end of the auxiliary substrate; the width of the main substrate is 1.2mm, the angle between the outer ends of the two auxiliary substrates is 49°, the radius of the transition fillet is 0.15mm, the angle between the inner sides of the two auxiliary substrates is 120°, the spacing between the two auxiliary substrates facing the loop inductor is 1.27mm, the angle between the inner sides of the auxiliary substrates with arc edges is 146°, the radius of the transition arc edge is 3.96mm, the spacing between the outer ends of the auxiliary substrates with arc edges is 3.44mm, the spacing between the outer end of the fifth bevel and the center point of the center node is 4.46mm, the spacing between the inner notch of the auxiliary substrate and the center point of the center node is 3.96mm, the radius of the through hole is 0.29mm, and the radius of the arc edge of the main substrate is 0.6mm.

9. The miniaturized center junction according to claim 6, characterized in that: The central junction is made of copper or copper alloy, and a silver-plated layer is provided on the surface of the central junction.

10. A circulator, characterized in that: include: A lower cavity, a center knot as described in any one of claims 1-9, and an upper cover, wherein the center knot is embedded in the lower cavity, and the upper cover is threadedly connected to the lower cavity and presses the center knot tightly.

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