Ultra-wideband miniaturized microstrip power divider

Abstract

The utility model provides an ultra-wideband miniaturized microstrip power divider, which comprises a plate, a power division microstrip line, a first-stage isolation resistor and a second-stage isolation resistor, wherein the power division microstrip line is connected to the plate; the first-stage isolation resistor and the second-stage isolation resistor are connected to the middle of the power division microstrip line; the power division microstrip line comprises a first main line, a first-stage quarter-wavelength converter, a second-stage quarter-wavelength converter, a second main line and a third main line; the first-stage quarter-wavelength converter and the second-stage quarter-wavelength converter are both in a semicircular line form. According to the utility model, only two stages of quarter-wavelength converters are needed, the size is small, the assembly process is simple, and the manufacturing cost is reduced; a microstrip line circuit is adopted, the design is simple, the adaptability is good, the board can be extended to other types of boards, and large-scale production is carried out; the ultra-wideband power divider is good in transmission performance, the insertion loss is less than 3.6 dB in the range of 1-22GHz, the voltage standing wave ratio is less than 2, and the ultra-wideband power divider is suitable for an ultra-wideband range.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical components, in particular to an ultra-wideband miniaturized microstrip power divider. Background Art

[0002] With the rapid development of microwave devices, microwave and millimeter wave circuits have been more and more widely used, and power dividers are one of the most widely used microwave circuits. Power dividers can be divided into T-junction power dividers, resistor power dividers, Wilkinson power dividers and other forms. Among them, Wilkinson power dividers are used in most microwave products due to their advantages such as port matching and good isolation.

[0003] In recent years, with the continuous development of technology, the system has higher and higher requirements for working bandwidth and structural size, and large bandwidth and miniaturized microwave devices have gradually become the first choice for product design. The traditional single-stage Wilkinson power divider has a narrow bandwidth and cannot be used across multiple octaves. Multi-stage Wilkinson power dividers will cause problems such as increased size.

[0004] Therefore, it is necessary to comprehensively consider the effects of bandwidth and size and design a microstrip Wilkinson power divider with large bandwidth and small size. Summary of the invention

[0005] The utility model aims to solve the problems of narrow bandwidth and large size of the existing microstrip Wilkinson power divider, and provides an ultra-wideband miniaturized microstrip power divider with simple assembly process, small insertion loss and small voltage standing wave ratio.

[0006] The utility model provides an ultra-wideband miniaturized microstrip power divider, comprising a plate, a power dividing microstrip line connected to the plate, a first-stage isolation resistor connected to the middle of the power dividing microstrip line, and a second-stage isolation resistor;

[0007] The power-dividing microstrip line includes a first main line, a first-stage quarter-wave converter, a second-stage quarter-wave converter, and a second main line and a third main line respectively connected to two ends of the second-stage quarter-wave converter and extending in opposite directions.

[0008] The first-stage isolation resistor is connected to the middle of the first-stage quarter-wave converter, and the second-stage isolation resistor is connected to the middle of the second-stage quarter-wave converter;

[0009] The first-stage quarter-wave converter and the second-stage quarter-wave converter are both in the form of semicircular lines. The directions of the second main line and the third main line are perpendicular to the first main line. The first main line is the input end, and the second main line and the third main line are both output ends.

[0010] In the ultra-wideband miniaturized microstrip power divider described in the utility model, as a preferred embodiment, the widths of the first main line, the second main line and the third main line are all 0.6 mm.

[0011] The ultra-wideband miniaturized microstrip power divider described in the utility model is preferably configured such that the first-stage quarter-wavelength converter is a symmetrical structure;

[0012] The first-stage quarter-wave transformer includes a first straight line portion connected perpendicularly to the first main line and extending to both ends, a first semicircular portion connected to both ends of the first straight line portion and extending downward, a second straight line portion connected to the ends of the first semicircular portion and extending to the middle, a third straight line portion connected perpendicularly to the second straight line portion, and a first corner cutoff portion connected to the ends of the third straight line portion;

[0013] The number of cut corners at the first semicircular portion, the second straight portion and the first corner are all two;

[0014] The first straight line portion is parallel to the second straight line portion, the cut corner at the first corner extends to both sides, and the cut corner at the first corner is connected to the second-stage quarter-wave transformer;

[0015] The first-level isolation resistor is connected between the two second straight line portions and the two third straight line portions.

[0016] The utility model describes an ultra-wideband miniaturized microstrip power divider, as a preferred embodiment, the line widths of the first straight line portion, the first semicircular portion and the second straight line portion are all 0.3mm, the total line length of the first straight line portion is 3mm, the inner radius of the first semicircular portion is 0.4mm, the angle cut at the first corner is 0.528mm, and the angle with the third straight line portion is 45°, the length of the third straight line portion is 0.3mm, the width is 0.48mm, and the width between the two third straight line portions is 0.5mm.

[0017] The ultra-wideband miniaturized microstrip power divider described in the utility model is preferably configured such that the second-stage quarter-wavelength converter is a symmetrical structure;

[0018] The second-stage quarter-wave transformer comprises a fourth straight line portion connected to the ends of the first-stage quarter-wave transformer and extending to both ends, a second semicircular portion connected to both ends of the fourth straight line portion and extending downward, a fifth straight line portion connected to the ends of the second semicircular portion and extending to the middle, a sixth straight line portion perpendicular to the fifth straight line portion, and a second corner cutoff connected to the end of the sixth straight line portion, the second corner cutoff extending to both sides;

[0019] The number of the fourth straight line portion, the second semicircular portion, the fifth straight line portion and the sixth straight line portion are all two;

[0020] The fourth straight line portion is parallel to the fifth straight line portion, the second main line, and the third main line, and the cutting angle at the second corner is connected to the second main line and the third main line respectively;

[0021] The second-stage isolation resistor is connected between the two fifth straight line portions.

[0022] The utility model describes an ultra-wideband miniaturized microstrip power divider, as a preferred embodiment, the line widths of the fourth straight line portion, the second semicircular portion and the fifth straight line portion are all 0.48mm, the total line length of the fourth straight line portion is 3mm, the inner radius of the second semicircular portion is 0.3mm, the angle cut at the second corner is 0.66mm, and the angle with the sixth straight line portion is 45°, the line length of the sixth straight line portion is 0.3mm, the line width is 0.6mm, and the width between the two sixth straight line portions is 0.5mm.

[0023] The ultra-wideband miniaturized microstrip power divider described in the utility model is preferably made of a Rogers 6002 substrate.

[0024] In the ultra-wideband miniaturized microstrip power divider described in the utility model, as a preferred embodiment, the resistance of the first-stage isolation resistor is 100 ohms.

[0025] In the ultra-wideband miniaturized microstrip power divider described in the utility model, as a preferred embodiment, the resistance of the second-stage isolation resistor is 240 ohms.

[0026] The utility model is an ultra-wideband miniaturized microstrip Wilkinson power divider, which is mainly used for radio frequency signal power distribution and synthesis. The power divider has a small number of stages, a small size, a simple assembly process, a low insertion loss, and a frequency that can cover the L, S, C, X, and Ku frequency bands.

[0027] The utility model has the following advantages:

[0028] (1) The utility model only requires two stages of quarter-wavelength converters, has a small finished size, and a simple assembly process, thus reducing the manufacturing cost.

[0029] (2) The utility model adopts a microstrip line circuit, which has a simple design and good adaptability, and can be extended to other types of plates for large-scale production.

[0030] (3) The utility model has good transmission performance, with an insertion loss of less than 3.6 dB in the range of 1 to 22 GHz and a voltage standing wave ratio of less than 2, and is suitable for use in the ultra-wideband range. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a simulation model of an ultra-wideband miniaturized microstrip power divider;

[0032] Figure 2 A schematic diagram of an ultra-wideband miniaturized microstrip power divider;

[0033] Figure 3 This is a diagram showing the insertion loss simulation results of an ultra-wideband miniaturized microstrip power divider;

[0034] Figure 4 This is a simulation result diagram of the voltage standing wave ratio of an ultra-wideband miniaturized microstrip power divider.

[0035] Reference numerals:

[0036] 1. Plate; 2. Power-dividing microstrip line; 21. First main line; 22. First-stage quarter-wave converter; 221. First straight line portion; 222. First semicircular portion; 223. Second straight line portion; 224. Third straight line portion; 225. Cut corner at first corner; 23. Second-stage quarter-wave converter; 231. Fourth straight line portion; 232. Second semicircular portion; 233. Fifth straight line portion; 234. Sixth straight line portion; 235. Cut corner at second corner; 24. Second main line; 25. Third main line; 3. First-stage isolation resistor; 4. Second-stage isolation resistor. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0038] Example 1

[0039] like Figures 1-2 As shown, an ultra-wideband miniaturized microstrip power divider includes a plate 1, a power dividing microstrip line 2 connected to the plate 1, a first-stage isolation resistor 3 connected to the middle of the power dividing microstrip line 2, and a second-stage isolation resistor 4;

[0040] The power division microstrip line 2 includes a first main line 21, a first-stage quarter-wave transformer 22, a second-stage quarter-wave transformer 23, and a second main line 24 and a third main line 25 connected to two ends of the second-stage quarter-wave transformer 23 and extending in opposite directions.

[0041] The first-stage isolation resistor 3 is connected to the middle of the first-stage quarter-wave converter 22 , and the second-stage isolation resistor 4 is connected to the middle of the second-stage quarter-wave converter 23 ;

[0042] The first-stage quarter-wavelength converter 22 and the second-stage quarter-wavelength converter 23 are both in the form of semicircular lines. The directions of the second main line 24 and the third main line 25 are perpendicular to the first main line 21. The first main line 21 is the input end, and the second main line 24 and the third main line 25 are both output ends. The widths of the first main line 21, the second main line 24 and the third main line 25 are all 0.6 mm.

[0043] The first-stage quarter-wavelength converter 22 is a symmetrical structure;

[0044] The first-stage quarter-wave transformer 22 includes a first straight portion 221 connected perpendicularly to the first main line 21 and extending to both ends, a first semicircular portion 222 connected to both ends of the first straight portion 221 and extending downward, a second straight portion 223 connected to the ends of the first semicircular portion 222 and extending to the middle, a third straight portion 224 connected perpendicularly to the second straight portion 223, and a first corner cut 225 connected to the ends of the third straight portion 224;

[0045] The number of the first semicircular portion 222, the second straight portion 223 and the cut corner 225 at the first corner are all two;

[0046] The first straight line portion 221 is parallel to the second straight line portion 223 , the cut corner 225 at the first corner extends to both sides, and the cut corner 225 at the first corner is connected to the second-stage quarter-wave transformer 23 ;

[0047] The first-level isolation resistor 3 is connected between the two second straight line portions 223 and the two third straight line portions 224;

[0048] The line widths of the first straight portion 221, the first semicircular portion 222 and the second straight portion 223 are all 0.3 mm, the total length of the first straight portion 221 is 3 mm, the inner radius of the first semicircular portion 222 is 0.4 mm, the width of the cut corner 225 at the first corner is 0.528 mm, the length of the third straight portion 224 is 0.3 mm, the width is 0.48 mm, and the width between the two third straight portions is 0.5 mm;

[0049] The second-stage quarter-wavelength converter 23 is a symmetrical structure;

[0050] The second-stage quarter-wave transformer 23 includes a fourth straight portion 231 connected to the ends of the first-stage quarter-wave transformer 22 and extending to both ends, a second semicircular portion 232 connected to both ends of the fourth straight portion 231 and extending downward, a fifth straight portion 233 connected to the ends of the second semicircular portion 232 and extending to the middle, a sixth straight portion 234 perpendicular to the fifth straight portion 233, and a second corner cut 235 connected to the end of the sixth straight portion 234, and the second corner cut 235 extends to both sides;

[0051] The number of the fourth straight portion 231, the second semicircular portion 232, the fifth straight portion 233 and the sixth straight portion 234 are all two;

[0052] The fourth straight line portion 231 is parallel to the fifth straight line portion 233, the second main line 24, and the third main line 25, and the cut corner 235 at the second corner is connected to the second main line 24 and the third main line 25 respectively;

[0053] The second-stage isolation resistor 4 is connected between the two fifth straight line portions 223;

[0054] The line widths of the fourth straight line portion 231, the second semicircular portion 232 and the fifth straight line portion 233 are all 0.48 mm, the total length of the fourth straight line portion 231 is 3 mm, the inner radius of the second semicircular portion 232 is 0.3 mm, the width of the cut corner 235 at the second corner is 0.66 mm, the line length of the sixth straight line portion 234 is 0.3 mm, the line width is 0.6 mm, and the width between the two sixth straight line portions is 0.5 mm;

[0055] Plate 1 is Rogers6002 substrate;

[0056] The resistance of the first-stage isolation resistor 3 is 100 ohms;

[0057] The resistance of the second-stage isolation resistor 4 is 240 ohms.

[0058] The design method of the utility model is as follows:

[0059] (1) First, the quarter-wavelength transformer stage of the power divider is simulated by ADS and determined to be a two-stage Wilkinson power divider.

[0060] (2) Select the circuit board material and core board thickness. The selected board material is Rogers6002 board, with a dielectric constant of 2.94, a core board thickness of 0.254mm, and a base copper thickness of 0.5oz.

[0061] (3) The quarter-wavelength lines of the Wilkinson power divider are all in the form of semicircular lines, which saves more longitudinal dimension than the right-angle line form.

[0062] The main line width is 0.6mm, the first-stage quarter-wave converter line width is 0.3mm, the straight part length is 1.5mm, the inner radius of the semicircular part is 0.4mm, and the corner cut width is 0.528mm. The second-stage quarter-wave converter line width is 0.48mm, the straight part length is 1.5mm, the inner radius of the semicircular part is 0.3mm, and the corner cut width is 0.66mm. The straight part in the middle of the two-stage quarter-wave converter is 0.3mm long, and the width of the middle isolation resistor area is 0.5mm.

[0063] (4) Determine the isolation resistance values ​​of the two stages.

[0064] The first level isolation resistor is 100 ohms, and the second level isolation resistor is 240 ohms. Figures 3-4 is the simulation result, Figure 3 are the insertion losses of the two branch ports respectively, Figure 4 These are standing waves of the three ports respectively. From the simulation results, it can be seen that the insertion loss of this embodiment is lower than 3.6 dB in the range of 1 to 22 GHz, and the voltage standing wave ratio is less than 2.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An ultra-wideband miniaturized microstrip power divider, characterized in that: It comprises a plate (1), a power division microstrip line (2) connected to the plate (1), a first-stage isolation resistor (3) connected to the middle of the power division microstrip line (2), and a second-stage isolation resistor (4); The power division microstrip line (2) comprises a first main line (21), a first-stage quarter-wave converter (22), a second-stage quarter-wave converter (23) connected in sequence, and a second main line (24) and a third main line (25) respectively connected to two ends of the second-stage quarter-wave converter (23) and extending in opposite directions; The first-stage isolation resistor (3) is connected to the middle of the first-stage quarter-wave converter (22), and the second-stage isolation resistor (4) is connected to the middle of the second-stage quarter-wave converter (23); The first-stage quarter-wave converter (22) and the second-stage quarter-wave converter (23) are both in the form of semicircular lines, the directions of the second main line (24) and the third main line (25) are both perpendicular to the first main line (21), the first main line (21) is an input end, and the second main line (24) and the third main line (25) are both output ends.

2. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The width of the first main line (21), the second main line (24) and the third main line (25) are all 0.6 mm.

3. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The first-stage quarter-wavelength converter (22) is a symmetrical structure; The first-stage quarter-wavelength converter (22) comprises a first straight portion (221) vertically connected to the first main line (21) and extending to both ends, a first semicircular portion (222) connected to both ends of the first straight portion (221) and extending downward, a second straight portion (223) connected to the ends of the first semicircular portion (222) and extending to the middle, a third straight portion (224) vertically connected to the second straight portion (223), and a first corner cutout (225) connected to the ends of the third straight portion (224); The number of the first semicircular portion (222), the second straight portion (223) and the first corner cut corner (225) are all two; The first straight line portion (221) is parallel to the second straight line portion (223); the first corner cut-off (225) extends to both sides; and the first corner cut-off (225) is connected to the second-stage quarter-wavelength converter (23); The first-level isolation resistor (3) is connected between the two second straight line portions (223) and the two third straight line portions (224).

4. The ultra-wideband miniaturized microstrip power divider according to claim 3, characterized in that: The line widths of the first straight portion (221), the first semicircular portion (222) and the second straight portion (223) are all 0.3 mm, the total length of the first straight portion (221) is 3 mm, the inner radius of the first semicircular portion (222) is 0.4 mm, the length of the third straight portion (224) is 0.3 mm, the width is 0.48 mm, the width between the two third straight portions (224) is 0.5 mm, the width of the cut corner (225) at the first corner is 0.528 mm, and the angle between the cut corner (225) and the third straight portion (224) is 45°.

5. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The second-stage quarter-wavelength converter (23) is a symmetrical structure; The second-stage quarter-wave transformer (23) comprises a fourth straight portion (231) connected to the ends of the first-stage quarter-wave transformer (22) and extending to both ends, a second semicircular portion (232) connected to both ends of the fourth straight portion (231) and extending downward, a fifth straight portion (233) connected to the ends of the second semicircular portion (232) and extending to the middle, a sixth straight portion (234) perpendicular to the fifth straight portion (233), and a second corner cut (235) connected to the end of the sixth straight portion (234), wherein the second corner cut (235) extends to both sides; The number of the fourth straight line portion (231), the second semicircular portion (232), the fifth straight line portion (233) and the sixth straight line portion (234) are all two; The fourth straight line portion (231) is parallel to the fifth straight line portion (233), the second main line (24), and the third main line (25); the second corner cut corner (235) is connected to the second main line (24) and the third main line (25) respectively; The second-stage isolation resistor (4) is connected between the two fifth straight line portions (233).

6. The ultra-wideband miniaturized microstrip power divider according to claim 5, characterized in that: The line widths of the fourth straight line portion (231), the second semicircular portion (232) and the fifth straight line portion (233) are all 0.48 mm, the total length of the fourth straight line portion (231) is 3 mm, the inner radius of the second semicircular portion (232) is 0.3 mm, the width of the cut corner (235) at the second corner is 0.66 mm, and the included angle with the sixth straight line portion (234) is 45°, the line length of the sixth straight line portion (234) is 0.3 mm, the line width is 0.6 mm, and the width between the two sixth straight line portions (234) is 0.5 mm.

7. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The plate (1) is a Rogers 6002 substrate.

8. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The resistance of the first-level isolation resistor (3) is 100 ohms.

9. The ultra-wideband miniaturized microstrip power divider according to claim 1, characterized in that: The resistance of the second-level isolation resistor (4) is 240 ohms.

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