A micro center knot and circulator

Abstract

The present invention relates to a micro center junction, characterized in that it includes an integrally formed resonant resistor, loop inductor and matching capacitor; the resonant resistor includes a connecting section and an arc-shaped outward expansion section, the outer diameter of the arc-shaped outward expansion section is larger than the connecting section and the two sides of the arc-shaped outward expansion section are inclined; the matching capacitor includes: a main substrate and a secondary substrate 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 provided with a chamfer, the main substrate and the secondary substrate are transitioned by a fillet, and the outer side edge of the secondary substrate is an arc edge. Through the structure and size selection of the center junction of the present invention, the problem of poor performance indicators and poor consistency of small-sized isolators and circulators is solved, the insertion loss, intermodulation performance and working bandwidth are optimized, and the cost is low, the system index requirements can be met more efficiently, the stability is good, and the mass production 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 micro center 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 micro center knot.

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

[0005] A miniature 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 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 provided with a chamfer, the main substrate and the auxiliary substrate are transitioned by a rounded corner, and the outer side edge of the auxiliary substrate is an arc edge;

[0006] The radius of the arc-shaped outward expansion section is 2.77-2.93 mm, and the distance between the end of the connecting section and the center point of the center node is 1.53-1.70 mm;

[0007] The width of the loop inductor is 0.27-0.45 mm;

[0008] The width of the main substrate is 0.87-1.43 mm, the radius of the through hole is 0.222-0.228 mm, the radius of the outer side of the auxiliary substrate is 2.84-2.93 mm, and the width of the chamfer at the outer end of the main substrate is 0.22-0.33 mm.

[0009] As a preferred solution of the present invention, the angle between the two sides of the arc-shaped expansion section is 66.49°, the radius is 2.80 mm, and the distance between the end of the connecting section and the center point of the center node is 1.55 mm.

[0010] As a preferred solution of the present invention, both side edges of the connecting section are inclined, and the angle formed by the two side edges of the connecting section is 15.65°.

[0011] As a preferred solution of the present invention, the widths of the three loop inductors are all 0.30 mm.

[0012] As a preferred embodiment of the present invention, the spacing between the inner side recess of the chamfered auxiliary substrate and the center point of the center node is 2.55 mm, the spacing between the inner side recess of the other auxiliary substrates and the center point of the center node is 2.60 mm, the radius of the outer side edge of the auxiliary substrate is 2.87 mm, the radius of the fillet between the main substrate and the auxiliary substrate is 0.3 mm, the spacing between the inner side edges of the auxiliary substrates is 0.8 mm, the width of the main substrate is 0.9 mm, the inner radius of the auxiliary substrate is 1.5 mm, the radius of the through hole is 0.225 mm, the width of the chamfer of the outer end of the main substrate is 0.30 mm, and the angle formed between the outer sides of the auxiliary substrates is 52.20°.

[0013] As a preferred solution of the present invention, the angle between the two sides of the arc-shaped expansion section is 105.6°, the radius is 2.90 mm, and the distance between the end of the connecting section and the center point of the center node is 1.67 mm.

[0014] As a preferred solution of the present invention, an outer protrusion is provided between the connecting section and the arc-shaped outward expansion section, the angle formed between the inner sides of the outer protrusion is 120°, and the distance between the outer end of the outer protrusion and the center point of the center node is 1.96 mm.

[0015] As a preferred solution of the present invention, the widths of the three loop inductors are 0.40 mm, 0.40 mm and 0.42 mm respectively.

[0016] As a preferred embodiment of the present invention, the inner side edge of the auxiliary substrate is provided with a connecting bevel, the inner side recess of the auxiliary substrate is arc-shaped, the angle formed between the connecting bevels is 32.70°, the radius of the outer side edge of the auxiliary substrate is 2.90mm, the radius of the inner side recess of the auxiliary substrate is 2.85mm, the angle formed between the outer sides of the auxiliary substrate is 14.4°, the angle formed between the inner ends of the auxiliary substrate is 120°, the spacing between the inner sides of the auxiliary substrates is 1.12mm, the radius of the fillet between the main substrate and the auxiliary substrate is 0.2mm, the radius of the through hole is 0.225mm, the width of the chamfer of the outer end of the main substrate is 0.25mm, and the width of the main substrate is 1.40mm.

[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 miniature 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 needs of 5G miniaturization. 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 7This 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 This 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. Outer protrusion; 5. Loop inductor; 6. Matching capacitor; 61. Main substrate; 62. Sub-substrate; 63. Through hole; 64. Chamfer; 65. Connecting bevel. 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] Example

[0039] A micro-center knot 2, such as Figures 1 to 4As 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 a chamfer 64 is arranged on the outer end of one of the main substrates 61, the main substrate 61 and the sub-substrate 62 are transitioned by a rounded corner, and the outer side edge of the sub-substrate 62 is an arc edge.

[0040] Among them, the radius of the arc-shaped outward expansion section 42 is 2.77-2.93mm, the distance between the end of the connecting section 41 and the center point of the center node 2 is 1.53-1.70mm; the width of the loop inductor 5 is 0.27-0.45mm; the width of the main substrate 61 is 0.87-1.43mm, the radius of the through hole 63 is 0.222-0.228mm, the radius of the outer edge of the auxiliary substrate 62 is 2.84-2.93mm, and the width of the chamfer 64 at the outer end of the main substrate 61 is 0.22-0.33mm.

[0041] Specifically, in this embodiment, the angle 4-1 on both sides of the arc-shaped outward expansion section 42 is 66.49°, the radius 4-2 is 2.80 mm, the distance 4-3 between the end of the connecting section 41 and the center point of the center node 2 is 1.55 mm, the two side edges of the connecting section 41 are inclined, and the angle 4-4 formed by the two side edges of the connecting section 41 is 15.65°.

[0042] The widths of the three loop inductors 5 (5-1, 5-2, 5-3) are all 0.30 mm.

[0043] The spacing 6-1 between the inner recess of the auxiliary substrate 62 with chamfer 64 and the center point of the center node 2 is 2.55 mm, the spacing (6-2, 6-3) between the inner recesses of other auxiliary substrates 62 and the center point of the center node 2 is 2.60 mm, the radius 6-4 of the outer side of the auxiliary substrate 62 is 2.87 mm, the radius 6-5 of the fillet between the main substrate 61 and the auxiliary substrate 62 is 0.3 mm, the spacing 6-6 between the inner sides of the auxiliary substrates 62 is 0.8 mm, the width 6-7 of the main substrate 61 is 0.9 mm, the inner radius 6-8 of the auxiliary substrate 62 is 1.5 mm, the radius 6-9 of the through hole 63 is 0.225 mm, the width 6-10 of the chamfer 64 at the outer end of the main substrate 61 is 0.30 mm, and the angle 6-11 formed between the outer sides of the auxiliary substrates 62 is 52.20°.

[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 to reduce 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 node 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. It has good stability and strong mass manufacturability, and provides a suitable ohmic matching value 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 to meet the miniaturization requirements of 5G. The center node 2 of this embodiment is applicable to a frequency range of 3400MHz-3600MHz, and the size of the product can be reduced to 7mm*7mm.

[0046] like Figure 5 and Figure 6 The performance test curve of the product is shown, where: Figure 5 The isolation parameter is 21dB, the return loss parameter is 21dB, and the insertion loss parameter is 0.3B. Figure 6 The Tr1 and Tr2 areas are return loss parameters, which are 23dB; the Tr3 area is the isolation parameter, which is 23dB; and the Tr4 area is the insertion loss parameter, which is 0.27dB.

[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 outward expansion section 42 is 105.6°, the radius 4-2 is 2.90mm, the distance 4-3 between the end of the connecting section 41 and the center point of the center node 2 is 1.67mm, and an outer protrusion 43 is provided between the connecting section 41 and the arc-shaped outward expansion section 42. The angle 4-5 formed between the inner sides of the outer protrusion 43 is 120°, and the distance 4-6 between the outer end of the outer protrusion 43 and the center point of the center node 2 is 1.96mm.

[0049] The widths of the three loop inductors 5 (5-1, 5-2, 5-3) are 0.40 mm, 0.40 mm, and 0.42 mm, respectively.

[0050] The inner side edge of the auxiliary substrate 62 is provided with a connecting bevel 65, the inner side recess of the auxiliary substrate 62 is arc-shaped, the angle 6-12 formed between the connecting bevel edges 65 is 32.70°, the radius 6-4 of the outer side edge of the auxiliary substrate 62 is 2.90mm, the radius 6-13 of the inner side recess of the auxiliary substrate 62 is 2.85mm, the angle 6-11 formed between the outer sides of the auxiliary substrate 62 is 14.4°, the angle 6-14 formed between the inner ends of the auxiliary substrate 62 is 120°, the spacing 6-6 between the inner sides of the auxiliary substrate 62 is 1.12mm, the radius 6-5 of the fillet between the main substrate 61 and the auxiliary substrate 62 is 0.2mm, the radius 6-9 of the through hole 63 is 0.225mm, the width 6-10 of the chamfer 64 at the outer end of the main substrate 61 is 0.25mm, and the width 6-7 of the main substrate 61 is 1.40mm.

[0051] The applicable frequency range of the central node 2 of this embodiment is 2515MHz-2675MHz, and the size of the product can be reduced to 7mm*7mm.

[0052] like Fig.11 and Fig.12 The performance test curve of the product is shown, where: Fig.11 The isolation parameter is 20dB, the return loss parameter is 20dB, and the insertion loss parameter is 0.3dB. Fig.12 The Tr1 and Tr2 areas are return loss parameters, which are 22dB; the Tr3 area is the isolation parameter, which is 22dB; and the Tr4 area is the insertion loss parameter, which is 0.28dB.

[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 micro center knot, characterized in that: It 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 the connecting section and the two sides of the arc-shaped outward expansion section are inclined; 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 provided with a chamfer, the main substrate and the auxiliary substrate are transitioned by a rounded corner, and the outer side edge of the auxiliary substrate is an arc edge; The radius of the arc-shaped outward expansion section is 2.77-2.93 mm, and the distance between the end of the connecting section and the center point of the center node is 1.53-1.70 mm; The width of the loop inductor is 0.27-0.45 mm; The width of the main substrate is 0.87-1.43 mm, the radius of the through hole is 0.222-0.228 mm, the radius of the outer side of the auxiliary substrate is 2.84-2.93 mm, and the width of the chamfer at the outer end of the main substrate is 0.22-0.33 mm.

2. The micro center knot according to claim 1, characterized in that: The included angle between the two sides of the arc-shaped outward expansion section is 66.49°, the radius is 2.80 mm, and the distance between the end of the connecting section and the center point of the center node is 1.55 mm.

3. The micro center knot according to claim 2, characterized in that: The two side edges of the connecting section are arranged obliquely, and the angle formed by the two side edges of the connecting section is 15.65°.

4. The micro center knot according to claim 3, characterized in that: The widths of the three loop inductors are all 0.30 mm.

5. The micro center knot according to claim 4, characterized in that: The spacing between the inner notch of the chamfered auxiliary substrate and the center point of the center node is 2.55mm, the spacing between the inner notch of the other auxiliary substrates and the center point of the center node is 2.60mm, the radius of the outer side edge of the auxiliary substrate is 2.87mm, the radius of the fillet between the main substrate and the auxiliary substrate is 0.3mm, the spacing between the inner sides of the auxiliary substrates is 0.8mm, the width of the main substrate is 0.9mm, the inner radius of the auxiliary substrate is 1.5mm, the radius of the through hole is 0.225mm, the width of the chamfer of the outer end of the main substrate is 0.30mm, and the angle formed between the outer sides of the auxiliary substrates is 52.20°.

6. The micro center knot according to claim 1, characterized in that: The included angle between the two sides of the arc-shaped outward expansion section is 105.6°, the radius is 2.90 mm, and the distance between the end of the connecting section and the center point of the center node is 1.67 mm.

7. The micro center knot according to claim 6, characterized in that: An outer convex block is provided between the connecting section and the arc-shaped outward expansion section, the angle formed between the inner sides of the outer convex block is 120°, and the distance between the outer end of the outer convex block and the center point of the center node is 1.96 mm.

8. The micro center knot according to claim 7, characterized in that: The widths of the three loop inductors are 0.40 mm, 0.40 mm and 0.42 mm respectively.

9. The micro center knot according to claim 8, characterized in that: The inner side edge of the auxiliary substrate is provided with a connecting bevel, the inner side recess of the auxiliary substrate is arc-shaped, the angle formed between the connecting bevels is 32.70°, the radius of the outer side edge of the auxiliary substrate is 2.90mm, the radius of the inner side recess of the auxiliary substrate is 2.85mm, the angle formed between the outer sides of the auxiliary substrate is 14.4°, the angle formed between the inner ends of the auxiliary substrate is 120°, the spacing between the inner sides of the auxiliary substrate is 1.12mm, the radius of the fillet between the main substrate and the auxiliary substrate is 0.2mm, the radius of the through hole is 0.225mm, the width of the chamfer of the outer end of the main substrate is 0.25mm, and the width of the main substrate is 1.40mm.

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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