CN116979237A - Ultra-wideband microstrip power divider - Google Patents
Ultra-wideband microstrip power divider Download PDFInfo
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- CN116979237A CN116979237A CN202310866017.4A CN202310866017A CN116979237A CN 116979237 A CN116979237 A CN 116979237A CN 202310866017 A CN202310866017 A CN 202310866017A CN 116979237 A CN116979237 A CN 116979237A
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Abstract
The invention belongs to the technical field of radio frequency circuit elements, and particularly relates to an ultra-wideband microstrip power divider, which comprises an input end 50 omega microstrip line, a gradual change line, a bridge, a 100 omega resistor and an output end 50 omega microstrip line, wherein the invention changes a quarter-wavelength impedance transformation line into a continuous gradual change line form, so that the discontinuity between impedance transformation parts is reduced to a certain extent, the reflection is reduced, and the working bandwidth of the power divider is increased; meanwhile, the bridge is arranged between the two gradual change lines, so that the working bandwidth of the power divider can be further expanded.
Description
Technical Field
The invention belongs to the technical field of radio frequency circuit elements, and particularly relates to an ultra-wideband microstrip power divider.
Background
The power distributor is a multiport passive microwave device and is widely applied to the fields of wireless communication systems, radar systems, electronic countermeasure and the like. The input signal power is distributed to each output port according to a certain proportion, and can be reversely used as a power synthesizer, and the power synthesis output is carried out by superposing microwave signals of all paths.
In a microwave integrated circuit, a Wilkinson power divider as shown in fig. 1 is the most commonly used form, and in the case of halving, each output port can obtain output signals with equal magnitude and equal phase. The power divider in the modern microwave solid-state circuit is required to have small insertion loss, and the consistency of the amplitude and the phase of each path is good so as to ensure better power distribution and higher synthesis efficiency. The isolation degree is required to be good, the balance degree is high, and when one path fails, the normal operation of the other path is not influenced, so that the safety coefficient and the reliability of the equipment are improved. Besides, the processing and production conditions of the power divider are easy to meet, and the structural form is simple, so that the consistency of the power divider is ensured in the mass production process. Finally, the broadband characteristic of the power divider is also a very important index, namely, the required performance is achieved in a wider frequency band, which is also the trend of future development of the power divider. With the rapid progress of the development of military equipment in China, the application of the high-reliability microwave power divider in a wide frequency band is wider and wider, and the demand is rapidly increased. Particularly in modern radar systems, a wideband system is often selected as a system scheme for improving the adaptability and the multi-signal capturing capability of equipment, so that the design of the wideband power divider has great significance and engineering value.
Disclosure of Invention
In view of the above, the invention provides an ultra-wideband microstrip power divider which expands the bandwidth compared with the traditional Wilkinson power divider and has obvious ultra-wideband characteristics aiming at the fact that the bandwidth of the traditional Wilkinson power divider is not wide enough and cannot be applied to a broadband microwave system.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
an ultra-wideband microstrip power divider comprising:
a 50 Ω microstrip line at the input;
the two gradual change lines are connected with the input end 50 omega microstrip line and gradually widen towards the direction far away from the input end 50 omega microstrip line; the two gradual change lines are symmetrically distributed along the central line of the input end 50Ω microstrip line;
one end of the bridge is connected with one end of the two gradual change lines far away from the 50 omega microstrip line of the input end, and the other end of the bridge is connected with the 50 omega microstrip line of the two output ends; the main body of the bridge is rectangular, two rectangular hollowed-out parts are arranged on the main body of the bridge, and the two hollowed-out parts are symmetrically distributed on the central line of the main body of the bridge; the central line of the main body of the bridge is perpendicular to the central line of the input end 50Ω microstrip line;
the 100 omega resistor is arranged between the two 50 omega microstrip lines at the output end and is arranged at a distance from the bridge;
wherein: the two output end 50Ω microstrip lines are symmetrically distributed along the center line of the input end 50Ω microstrip line.
Further, the profile formula of the gradual change line is w (y) = (b-a) - (b-a) sin 2 (πy/2l)，
Wherein:
a is the width of the initial end of the gradual change line;
b, the width of the termination end of the gradual change line;
l is the length of the gradual change line.
Further, the thickness of the substrate of the microstrip power divider is 20mil.
Further, a is 0.65-0.69mm; b is 0.91-0.95mm; l is 4.48-4.52mm.
Further, a is 0.67mm; b is 0.93mm; l is 4.5mm.
Further, the main body of the bridge is connected with the gradual change line and the output end 50Ω microstrip line respectively based on two long sides; the long side of the hollowed-out part is parallel to the central line of the main body of the bridge; the two hollowed-out parts are symmetrical with the center point of the main body of the bridge in a center mode.
Further, the length of the main body of the bridge is 2.68-2.72mm, and the width of the main body is 3.36-3.4mm; the length of the hollowed-out part is 1.08-1.12mm, and the width is 0.48-0.52mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge is 0.63-0.67mm.
Further, the length of the main body of the bridge is 2.7mm, and the width of the main body is 3.38mm; the length of the hollowed-out part is 1.1mm, and the width of the hollowed-out part is 0.5mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge is 0.65mm.
Further, the shortest distance between the 100 ohm resistor and the bridge is 4.18-4.22mm.
Further, the shortest linear distance between the 100 Ω resistor and the bridge is 4.2mm.
By adopting the technical scheme, the invention has the following beneficial effects:
according to the invention, the quarter-wavelength impedance transformation line is changed into a continuous gradual change line form, so that the discontinuity between the impedance transformation parts is reduced to a certain extent, the reflection is reduced, and the working bandwidth of the power divider is increased;
according to the invention, the bridge is arranged between the two gradual change lines, so that the working bandwidth of the power divider can be further expanded.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a microstrip power divider in the prior art;
FIG. 2 is a schematic diagram of an ultra wideband microstrip power divider according to an embodiment of the present invention;
FIG. 3 is a graph of the insertion loss of a Wilkinson power divider of the prior art;
FIG. 4 is a graph showing the return loss and isolation curves of a Wilkinson power divider in the prior art
FIG. 5 is a graph of insertion loss of an ultra wideband microstrip power divider according to an embodiment of the present invention;
FIG. 6 is a graph of return loss and isolation curves of an ultra-wideband microstrip power divider according to an embodiment of the present invention;
wherein: 1. a gradual change line; 2. an electric bridge; 3. a 50 omega microstrip line at the output end; 4. a resistance of 100 Ω; 5. and a 50 omega microstrip line at the input end.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
In one embodiment of the present invention, an ultra-wideband microstrip power divider is provided, as shown in fig. 2, including:
a microstrip line 5 with an input end of 50Ω;
the two gradual change lines 1 are connected with the input end 50 omega microstrip line 5 and gradually widen towards the direction far away from the input end 50 omega microstrip line 5; the two gradual change lines 1 are symmetrically distributed along the central line of the microstrip line 5 with 50 omega at the input end;
one end of the bridge 2 is connected with one end of the two gradual change lines 1 far away from the 50 omega microstrip line 5 at the input end, and the other end of the bridge is connected with the two 50 omega microstrip lines 3 at the output end; the main body of the bridge 2 is rectangular, two rectangular hollowed-out parts are arranged on the main body, and the two hollowed-out parts are symmetrically distributed on the central line of the main body of the bridge 2; the central line of the main body of the bridge 2 is perpendicular to the central line of the input end 50Ω microstrip line 5;
the 100 omega resistor 4 is arranged between the two microstrip lines 3 with 50 omega at the output ends and is arranged at intervals between the microstrip lines and the bridge 2;
wherein: the two output 50Ω microstrip lines 3 are symmetrically distributed with the center line of the input 50Ω microstrip line 5.
In the present embodiment, the profile formula of the gradation line 1 is w (y) = (b-a) - (b-a) sin 2 (πy/2l)，
Wherein:
a is the width of the initial end of the gradual change line 1;
b gradually changing the width of the termination end of the line 1;
l is the length of the gradient line 1.
In this embodiment, the substrate thickness of the microstrip power divider is 20 mils.
In this embodiment, a is 0.65-0.69mm; b is 0.91-0.95mm; l is 4.48-4.52mm.
In this embodiment, a is 0.67mm; b is 0.93mm; l is 4.5mm.
In the embodiment, the main body of the bridge 2 is respectively connected with the gradual change line 1 and the microstrip line 3 with 50 omega at the output end based on two long sides; the long side of the hollowed-out part is parallel to the central line of the main body of the bridge 2; the two hollowed-out parts are symmetrical with the center point of the main body of the bridge 2.
In this embodiment, the length of the main body of the bridge 2 is 2.68-2.72mm, and the width of the main body is 3.36-3.4mm; the length of the hollowed-out part is 1.08-1.12mm, and the width is 0.48-0.52mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge 2 is 0.63-0.67mm.
In this embodiment, the length of the body of the bridge 2 is 2.7mm and the width of the body is 3.38mm; the length of the hollowed-out part is 1.1mm, and the width is 0.5mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge 2 is 0.65mm.
In this embodiment, the straight line shortest distance between the 100 Ω resistor 4 and the bridge 2 is 4.18-4.22mm.
In this embodiment, the straight shortest distance between the 100 Ω resistor 4 and the bridge 2 is 4.2mm.
The three ports of the ultra-wideband microstrip power divider are all 50 omega microstrip lines, one quarter wavelength impedance transformation line is in the form of a gradual change line 1, and the outline formula of the gradual change line 1 is w (y) = (b-a) - (b-a) sin 2 (pi y/2 l), wherein a and b are the width of the starting end and the ending end of the gradual change line 1 respectively, and l is the length of the gradual change line 1; the parameters for the main optimization of the design and simulation are as follows:
the width of the starting end and the terminating end of the gradual change line 1 at the position 1 and the length of the gradual change line 1;
the two-section branch line bridge 2 at the position 2 is in a symmetrical form, and the lengths and the widths of the main line, the auxiliary line and the branch line are equal;
the length of the 50 omega microstrip line at 3;
the isolation resistor at the 4 parts is a 100 omega patch resistor.
The microstrip dielectric substrate of this embodiment is selected from Rogers5880, and the thickness of the substrate is 20mil.
As shown in figures 3 and 4, the S parameter of the traditional Wilkinson power divider has the insertion loss smaller than 0.12dB and the return loss and isolation degree larger than or equal to 20dB in the frequency range of 8 GHz-10.6 GHz. As shown in figures 5 and 6, the S parameter of the invention has the insertion loss smaller than 0.42dB and the return loss and isolation degree larger than or equal to 20dB in the frequency range of 6.5 GHz-12.5 GHz.
The detailed S parameter comparisons are shown in table 1.
Table 1 comparison of two power dividers S parameters
The ultra-wideband microstrip power divider of the embodiment has strong universality, simple structure, easy processing realization and mass production, and can be widely applied to C and X-band broadband microwave circuits.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the disclosure are intended to be covered by the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. An ultra-wideband microstrip power divider, comprising:
a 50 Ω microstrip line at the input;
the two gradual change lines are connected with the input end 50 omega microstrip line and gradually widen towards the direction far away from the input end 50 omega microstrip line; the two gradual change lines are symmetrically distributed along the central line of the input end 50Ω microstrip line;
one end of the bridge is connected with one end of the two gradual change lines far away from the 50 omega microstrip line of the input end, and the other end of the bridge is connected with the 50 omega microstrip line of the two output ends; the main body of the bridge is rectangular, two rectangular hollowed-out parts are arranged on the main body of the bridge, and the two hollowed-out parts are symmetrically distributed on the central line of the main body of the bridge; the central line of the main body of the bridge is perpendicular to the central line of the input end 50Ω microstrip line;
the 100 omega resistor is arranged between the two 50 omega microstrip lines at the output end and is arranged at a distance from the bridge;
wherein: the two output end 50Ω microstrip lines are symmetrically distributed along the center line of the input end 50Ω microstrip line.
2. The ultra-wideband microstrip power divider of claim 1, wherein the profile formula of the taper line is w (y) = (b-a) - (b-a) sin 2 (πy/2l)，
Wherein:
a is the width of the initial end of the gradual change line;
b, the width of the termination end of the gradual change line;
l is the length of the gradual change line.
3. The ultra-wideband microstrip power divider of claim 1, wherein the substrate thickness of the microstrip power divider is 20 mils.
4. The ultra-wideband microstrip power divider according to claim 2, wherein a is 0.65-0.69mm; b is 0.91-0.95mm; l is 4.48-4.52mm.
5. The ultra-wideband microstrip power divider of claim 4, wherein a is 0.67mm; b is 0.93mm; l is 4.5mm.
6. The ultra-wideband microstrip power divider according to claim 1, wherein the main body of the bridge is connected to the taper line and the output 50Ω microstrip line, respectively, based on two long sides; the long side of the hollowed-out part is parallel to the central line of the main body of the bridge; the two hollowed-out parts are symmetrical with the center point of the main body of the bridge in a center mode.
7. The ultra-wideband microstrip power divider of claim 6, wherein the length of the body of the bridge is 2.68-2.72mm and the width of the body is 3.36-3.4mm; the length of the hollowed-out part is 1.08-1.12mm, and the width is 0.48-0.52mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge is 0.63-0.67mm.
8. The ultra-wideband microstrip power divider of claim 7, wherein the length of the body of the bridge is 2.7mm and the width of the body is 3.38mm; the length of the hollowed-out part is 1.1mm, and the width of the hollowed-out part is 0.5mm; the distance between the long side of the hollowed-out part and the central line of the main body of the bridge is 0.65mm.
9. The ultra-wideband microstrip power divider according to claim 1, wherein a linear shortest distance between said 100 Ω resistor and said bridge is 4.18-4.22mm.
10. The ultra-wideband microstrip power divider according to claim 9, wherein the linear shortest distance between said 100 Ω resistor and said bridge is 4.2mm.
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| CN202310866017.4A CN116979237A (en) | 2023-07-13 | 2023-07-13 | Ultra-wideband microstrip power divider |
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| CN202310866017.4A CN116979237A (en) | 2023-07-13 | 2023-07-13 | Ultra-wideband microstrip power divider |
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