Ultra-wideband H-plane waveguide T-junction power divider

Abstract

The invention discloses an ultra-wideband H-plane waveguide T-junction power divider which comprises an input rectangular waveguide, a matching rectangular waveguide, a matching cylinder, a rectangular partition plate, two output rectangular waveguides and two adjusting cavities. The center line of the matching cylinder coincides with the center line where the vertical cross section and the longitudinal cross section of the output rectangular wave intersect, and the bottom face of the matching cylinder is attached to the bottom face of the output rectangular waveguide. The rectangular partition plate is positioned on the opposite side of the input rectangular waveguide and is embedded from the top to the input rectangular waveguide; the two adjusting cavities are located on the opposite side of the input rectangular waveguide and are arranged on the two sides of the rectangular partition plate respectively. Through the above structure, the power divider is very simple and compact in structure and easy to process, the impedance bandwidth of the input port S11 < =-20dB is higher than 64.9% in the frequency band of 4.44 GHz-8. 71 GHz, the amplitude and phase consistency of two paths of output signals in the frequency band is good, and the power divider has good popularization value.

Description

Technical Field

[0001] The invention relates to the field of power dividers, and in particular to an ultra-wideband H-plane waveguide T-junction power divider. Background Art

[0002] A power divider is a device that divides the energy of an input signal into two or more outputs of equal or unequal energy. It can also combine the energy of multiple signals into one output, which can also be called a combiner. Power dividers can be divided into many types according to their structural form, such as microstrip line structure, coaxial structure, dielectric integrated waveguide and metal waveguide structure. Among them, the H-plane waveguide T-junction power divider, also known as the rectangular waveguide HT branch, is a waveguide power / combiner commonly used in microwave engineering. The rectangular waveguide HT branch has the characteristics of simple structure, high power capacity and low insertion loss, and is widely used in power distribution / combination and array antenna feeding networks.

[0003] With the advancement of social informatization, emerging businesses represented by network video, cloud computing, big data, and the Internet of Things have dramatically increased their demands for the transmission capacity and rate of microwave communication systems, thereby putting forward increasingly higher bandwidth requirements for microwave antenna feed systems. However, the impedance bandwidth of traditional rectangular waveguide HT branches is narrow. Even if the bandwidth is expanded by loading metal adjustment pins, cones, metal spacers, etc., the impedance bandwidth of S11≤-20dB can usually only reach about 20%; the rectangular waveguide HT branch broadband technology in the prior art mainly includes: Y-junction and multi-stage step impedance matching. The bandwidth improvement of the former is limited, and the impedance bandwidth of S11≤-20dB can usually only reach about 30%; the latter, due to the introduction of multi-stage impedance transformation, leads to complex processing and large size, which is often difficult to meet the miniaturization requirements and has certain application limitations; the bandwidth can also be expanded by loading a rectangular plane matching boss of a ridge waveguide, with significant effect, and its impedance bandwidth of S11≤-20dB can reach 54%. However, this solution is still difficult to meet wider bandwidth requirements, such as more than 64%.

[0004] Therefore, there is an urgent need for an H-plane waveguide T-junction power divider with a simple and compact structure, easy processing, and an impedance bandwidth of S11≤-20dB higher than 64% to solve the above problems. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an ultra-wideband H-plane waveguide T-junction power divider.

[0006] An embodiment of the present invention solves the technical problem by adopting a technical solution: an ultra-wideband H-plane waveguide T-junction power divider, comprising an input rectangular waveguide, a matching rectangular waveguide, a matching cylinder, a rectangular partition, two output rectangular waveguides and two adjustment cavities;

[0007] Two output rectangular waveguides are straight through and orthogonal to the input rectangular waveguide to form an H-plane waveguide T-junction;

[0008] The matching rectangular waveguide connects the input rectangular waveguide and the output rectangular waveguide;

[0009] The center line of the matching cylinder coincides with the center line of the intersection of the vertical cross section and the longitudinal cross section of the output rectangular wave, and the bottom surface is in contact with the bottom surface of the output rectangular waveguide;

[0010] The rectangular partition is located at the opposite side of the input rectangular waveguide and is embedded from the top toward the input rectangular waveguide, and the rectangular partition is geometrically symmetrical with respect to the vertical cross section of the two output rectangular waveguides;

[0011] The two adjustment cavities are located at opposite sides of the input rectangular waveguide and are arranged on both sides of the rectangular partition, and the adjustment cavities are geometrically symmetrical with respect to the vertical cross-sections of the two output rectangular waveguides;

[0012] The TE10 mode input into the rectangular waveguide is divided into two signals of equal amplitude and phase and output from two output rectangular waveguides respectively.

[0013] As one of the preferred embodiments of the present invention, the width of the rectangular waveguide is matched: 85%-95% of the length of the wide side of the output rectangular waveguide;

[0014] Height of matching rectangular waveguide: 85%-95% of the length of the narrow side of the output rectangular waveguide;

[0015] Match the length of the rectangular waveguide: 1 / 8-1 / 4 of the guided wave length.

[0016] The diameter range of the matching cylinder is 30%-70% of the width of the output rectangular waveguide.

[0017] The height range of the matching cylinder is 20%-40% of the length of the narrow side of the output rectangular waveguide.

[0018] As one of the preferred embodiments of the present invention, the matching cylinder is shifted leftward or rightward along the symmetry line of the T-junction of the H-plane waveguide by a distance less than 5% of the length of the wide side of the output rectangular waveguide.

[0019] As one of the preferred embodiments of the present invention, the lower limit of the value range of the rectangular partition height is: the length of the narrow side of the output rectangular waveguide minus the height of the matching cylinder;

[0020] The upper limit of the rectangular partition height range is: the narrow side length of the output rectangular waveguide;

[0021] Embedding depth of rectangular partition: 30%-70% of the length of the wide side of the output rectangular waveguide;

[0022] The thickness of the rectangular partition is 6%-22% of the length of the wide side of the output rectangular waveguide.

[0023] As one of the preferred embodiments of the present invention, the height of the cavity is adjusted to be equal to the length of the narrow side of the output rectangular waveguide;

[0024] The range of adjusting cavity length is 35%-65% of the width of the output rectangular waveguide.

[0025] The width of the cavity is adjusted in the range of 5% to 25% of the width of the output rectangular waveguide.

[0026] The beneficial effects of the present invention are as follows: an ultra-wideband H-plane waveguide T-junction power divider comprises an input rectangular waveguide, a matching rectangular waveguide, a matching cylinder, a rectangular partition, two output rectangular waveguides and two adjustment cavities; the center line of the matching cylinder coincides with the center line of the intersection of the vertical cross section and the longitudinal cross section of the output rectangular wave, and the bottom surface is in contact with the bottom surface of the output rectangular waveguide; the rectangular partition is located on the opposite side of the input rectangular waveguide and is embedded from the top toward the input rectangular waveguide; the two adjustment cavities are located on the opposite side of the input rectangular waveguide and are arranged on both sides of the rectangular partition; the above structure can make the structure of the power divider very simple and compact, easy to process, and in the 4.44GHz-8.71GHz frequency band, the impedance bandwidth of the input port S11≤-20dB is higher than 64.9%, and the amplitude and phase consistency of the two output signals are good in the above frequency band, and the power divider has good promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 A three-dimensional diagram of a simulation model of a first embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0029] Figure 2 A top view of a simulation model of a first embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0030] Figure 3 A three-dimensional diagram of a simulation model of a second embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0031] Figure 4 A top view of a simulation model of a second embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0032] Figure 5 It is a structural assembly diagram of a first embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0033] Figure 6 A structural assembly diagram of a second embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0034] Figure 7This is an instantaneous distribution diagram of the electric field of the first embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0035] Figure 8 It is a schematic diagram of an S parameter curve of a first embodiment of an ultra-wideband H-plane waveguide T-junction power divider;

[0036] Fig. 9 It is a schematic diagram of phase curves of two branch signals of a first embodiment of an ultra-wideband H-plane waveguide T-junction power divider. DETAILED DESCRIPTION

[0037] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0038] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0041] Reference Figures 1 to 9 , an ultra-wideband H-plane waveguide T-junction power divider, comprising an input rectangular waveguide 10, a matching rectangular waveguide 20, a matching cylinder 30, a rectangular partition 40, two output rectangular waveguides 50 and two adjustment cavities 60;

[0042] The two output rectangular waveguides 50 are straight through and orthogonal to the input rectangular waveguide 10 to form an H-plane waveguide T-junction;

[0043] The matching rectangular waveguide 20 connects the input rectangular waveguide 10 and the output rectangular waveguide 50;

[0044] The center line of the matching cylinder 30 coincides with the center line of the intersection of the vertical cross section and the longitudinal cross section of the output rectangular wave, and the bottom surface fits the bottom surface of the output rectangular waveguide 50;

[0045] The rectangular partition 40 is located at the opposite side of the input rectangular waveguide 10 and is embedded from the top toward the input rectangular waveguide 10 . The rectangular partition 40 is geometrically symmetrical with respect to the vertical cross-section of the two output rectangular waveguides 50 .

[0046] The two adjustment cavities 60 are located at opposite sides of the input rectangular waveguide 10 and are arranged on both sides of the rectangular partition 40. The adjustment cavities 60 are geometrically symmetrical with respect to the vertical cross-sections of the two output rectangular waveguides 50.

[0047] The TE 10 mode inputted by the input rectangular waveguide 10 is split into two signals of equal amplitude and phase and outputted from two output rectangular waveguides 50 respectively.

[0048] 1)Reference Figure 1-Figure 6 In the present invention, the two output rectangular waveguides 50 are straight through, and the longitudinal cross-section where the center lines of the upper and lower wide sides of the output rectangular waveguide 50 are located is orthogonal to the longitudinal cross-section where the center lines of the upper and lower wide sides of the input rectangular waveguide 10 are located; the transverse cross-section where the center lines of the left and right narrow sides of the output rectangular waveguide 50 are located is on the same plane as the transverse cross-section where the left and right narrow sides of the input rectangular waveguide 10 are located; the vertical cross-section where the center lines of the front and rear long sides of the output rectangular waveguide 50 are located is on the same plane as the longitudinal cross-section of the input rectangular waveguide 10, that is, the two output rectangular waveguides 50 are geometrically symmetrical about the plane.

[0049] 2) The matching rectangular waveguide 20 connects the input rectangular waveguide 10 and the output rectangular waveguide 50, and the longitudinal cross-section and the transverse cross-section of the matching rectangular waveguide 20 coincide with the input rectangular waveguide 10; in some embodiments, in order to obtain a wider impedance bandwidth, the preferred means are: ① adjusting the width of the matching rectangular waveguide 20, preferably taking a value of 85%-95% of the length of the wide side of the output rectangular waveguide 50; ② adjusting the height of the matching rectangular waveguide 20, preferably taking a value of 85%-95% of the length of the narrow side of the output rectangular waveguide 50; ③ adjusting the length of the matching rectangular waveguide 20, preferably taking a value of 1 / 8-1 / 4 of the guided wave length.

[0050] 3) The center line of the matching cylinder 30 coincides with the center line of the intersection of the vertical cross section and the longitudinal cross section of the output rectangular wave, and the bottom surface fits with the bottom surface of the output rectangular waveguide 50; in some embodiments, in order to obtain a wider impedance bandwidth, the preferred means are: ① adjusting the diameter of the matching cylinder 30, and its preferred value is 30%-70% of the length of the wide side of the output rectangular waveguide 50; ② adjusting the height of the matching cylinder 30, and its preferred value is 20%-40% of the length of the narrow side of the output rectangular waveguide 50; ③ adjusting the position of the matching cylinder 30, specifically, moving it left or right along the symmetry line of the H-plane waveguide T-junction by a distance less than 5% of the length of the wide side of the output rectangular waveguide 50.

[0051] 4) The rectangular baffle 40 is located on the opposite side of the input rectangular waveguide 10 and is embedded from the top toward the input rectangular waveguide 10. The rectangular baffle 40 is geometrically symmetrical about the vertical cross-section of the two output rectangular waveguides 50. In some embodiments, in order to obtain a wider impedance bandwidth, the preferred means are: ① Adjust the height of the rectangular baffle 40, and the value range has an upper and lower limit, and the lower limit corresponds to Figure 1-Figure 2 In the first embodiment, the upper limit corresponds to Figure 3-Figure 4 In the second embodiment; Figure 1-Figure 2 It can be seen that the lower limit of the height range is: the narrow side length of the output rectangular waveguide 50 minus the height of the matching cylinder 30; Figure 3-Figure 4 It can be seen that the upper limit of the value range is: the narrow side length of the output rectangular waveguide 50; considering the actual processing, it is preferred to take the upper or lower limit; ② adjust the embedding depth of the rectangular partition 40, and its preferred value is 30%-70% of the wide side length of the output rectangular waveguide 50; ③ adjust the thickness of the rectangular partition 40, and its preferred value is 6%-22% of the wide side length of the output rectangular waveguide 50.

[0052] 5) The two adjustment cavities 60 are located on the opposite sides of the input rectangular waveguide 10 and are arranged on both sides of the rectangular partition 40. The adjustment cavities 60 are geometrically symmetrical with respect to the vertical cross-sections of the two output rectangular waveguides 50. Figure 2 and Figure 4 , from a top-down perspective, it is equivalent to loading two bosses on the top of the T-junction; in some embodiments, in order to obtain a wider impedance bandwidth, the preferred means are: ① adjusting the height of the adjustment cavity 60, and its preferred value is equal to the narrow side length of the output rectangular waveguide 50; ② adjusting the length of the adjustment cavity 60, and its preferred value range is 35%-65% of the wide side length of the output rectangular waveguide 50; ③ adjusting the width of the protrusion of the adjustment cavity 60, and its preferred value range is 5%-25% of the wide side length of the output rectangular waveguide 50.

[0053] 6) Through the above comprehensive means, combined with the optimization algorithm of the three-dimensional electromagnetic simulation software, good input return loss and good amplitude consistency of the two output branches can be obtained within a wide impedance bandwidth; the first embodiment provided by the present invention is used for illustration, referring to Figure 8-Figure 9 The optimized impedance bandwidth simulation result is that the impedance bandwidth of the input port S11≤-20dB is higher than 64.9% (4.44GHz-8.71GHz), and the amplitude and phase consistency of the two output signals are good within the above frequency band; the second embodiment provided by the present invention can also obtain similar results. In order to avoid repetition, only the results of the first embodiment are given. In addition, referring to Figure 5-Figure 6 , showing the structural assembly diagram of the first embodiment and the second embodiment in actual engineering, which is composed of an upper shell 80 and a lower shell 90. As can be seen from the figure, the present invention has the advantages of simple structure and easy processing, and has good engineering value.

[0054] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An ultra-wideband H-plane waveguide T-junction power divider, characterized in that: It comprises an input rectangular waveguide (10), a matching rectangular waveguide (20), a matching cylinder (30), a rectangular partition (40), two output rectangular waveguides (50) and two adjustment cavities (60); The two output rectangular waveguides (50) are directly connected and are orthogonal to the input rectangular waveguide (10) to form an H-plane waveguide T-junction; The matching rectangular waveguide (20) is connected to the input rectangular waveguide (10) and the output rectangular waveguide (50); The center line of the matching cylinder (30) coincides with the center line of the intersection of the vertical cross section and the longitudinal cross section of the output rectangular wave, and the bottom surface is in contact with the bottom surface of the output rectangular waveguide (50); The rectangular partition (40) is located on the opposite side of the input rectangular waveguide (10) and is embedded from the top toward the input rectangular waveguide (10), and the rectangular partition (40) is geometrically symmetrical with respect to the vertical cross-section of the two output rectangular waveguides (50); The two adjustment cavities (60) are located on opposite sides of the input rectangular waveguide (10) and are arranged on both sides of the rectangular partition (40); the adjustment cavities (60) are geometrically symmetrical with respect to the vertical cross-sections of the two output rectangular waveguides (50); The TE10 mode inputted from the input rectangular waveguide (10) is divided into two signals with equal amplitude and phase and outputted from the two output rectangular waveguides (50) respectively.

2. The ultra-wideband H-plane waveguide T-junction power divider according to claim 1, characterized in that: The width of the matching rectangular waveguide (20) is 85% to 95% of the length of the wide side of the output rectangular waveguide (50); The height of the matching rectangular waveguide (20) is 85% to 95% of the length of the narrow side of the output rectangular waveguide (50); The length of the matching rectangular waveguide (20) is 1 / 8 to 1 / 4 of the waveguide wavelength.

3. The ultra-wideband H-plane waveguide T-junction power divider according to claim 1, characterized in that: The diameter range of the matching cylinder (30) is 30%-70% of the length of the wide side of the output rectangular waveguide (50); The height range of the matching cylinder (30) is 20%-40% of the length of the narrow side of the output rectangular waveguide (50).

4. The ultra-wideband H-plane waveguide T-junction power divider according to claim 1, characterized in that: The matching cylinder (30) is shifted leftward or rightward along the symmetry line of the H-plane waveguide T-junction by a distance less than 5% of the length of the wide side of the output rectangular waveguide (50).

5. The ultra-wideband H-plane waveguide T-junction power divider according to claim 1, characterized in that: The lower limit of the range of values ​​of the height of the rectangular partition (40) is: the length of the narrow side of the output rectangular waveguide (50) minus the height of the matching cylinder (30); The upper limit of the range of values ​​of the height of the rectangular partition (40) is: the length of the narrow side of the output rectangular waveguide (50); The embedding depth of the rectangular partition (40) is 30% to 70% of the length of the wide side of the output rectangular waveguide (50); The thickness of the rectangular partition (40) is 6% to 22% of the length of the wide side of the output rectangular waveguide (50).

6. The ultra-wideband H-plane waveguide T-junction power divider according to claim 1, characterized in that: The height of the adjustment cavity (60) is equal to the length of the narrow side of the output rectangular waveguide (50); The length of the adjustment cavity (60) ranges from 35% to 65% of the length of the wide side of the output rectangular waveguide (50); The width of the adjustment cavity (60) has a value range of 5% to 25% of the length of the wide side of the output rectangular waveguide (50).

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