CN103401051A - Broadband power synthesizer based on radial line and substrate integrated waveguide - Google Patents

Abstract

The invention discloses a broadband power synthesizer based on a radial line and substrate integrated waveguide, and belongs to the technical field of microwave/millimeter-wave devices. The broadband power synthesizer comprises two power dividing structures which are arranged in a back-to-back manner, and four vertical connectors for connecting the power dividing structures. A coaxial-radial line conversion structures of the power dividing structures convert the input signals into a radial line mode from a coaxial line mode through broadband matching , and transmit the input signals to four full mode-half mode substrate integrated waveguide power dividers in a constant amplitude same phase manner; the four full mode-half mode substrate integrated waveguide power dividers divide the signals into eight ways, and output the signals to eight output microstrip lines through a graded microstrip line segment, and further are connected to the four vertical connectors to enable the signals subjected to synthesis to be output in one way through the power dividing structures below the vertical connectors. The broadband power synthesizer has the characteristics of broad frequency band, less insertion loss, excellent electric conduction and heat dissipation performance, small circuit space coupling and easiness in integration with the planar circuit, and is suitable for synthesis of large power singles.

Description

Broadband Power Combiner Based on Radial Wire and Substrate Integrated Waveguide

technical field

The invention relates to the technical field of microwave/millimeter wave devices, in particular to a wide-band radio frequency power combiner based on radial lines and substrate integrated waveguides. The invention is applied to a microwave communication system, can effectively improve the output power of a transmitter, and increase the coverage of wireless signals.

Background technique

In wireless communication systems, radar systems, communication jamming systems, remote sensing and telemetry systems, and many other fields, power amplifiers are used as the final output devices in transmitters, and their output power levels directly determine the coverage and even system capacity of transmitter signals. As the frequency range of applications expands to microwave and millimeter wave bands, the output power of a single solid-state device often cannot meet the requirements. Therefore, it is necessary to combine the output power of multiple devices to obtain the required power level.

Power combiners have been extensively studied in academia. Among them, the power combiner based on metal rectangular waveguide has the advantages of small loss and large power capacity. However, the cost of this circuit is high and it is difficult to integrate with planar active devices. On the other hand, although the power combining circuit based on the microstrip planar transmission line is easy to connect with active power devices and has low production cost, because it is a semi-open waveguide structure, the transmission loss is large and the radiation is strong. The synthesis efficiency is low, thus limiting the application of this type of synthesis circuit in the microwave high frequency band. In recent years, substrate-integrated waveguide (SIW) and half-mode substrate-integrated waveguide (HMSIW) have been proposed as new microwave and millimeter-wave planar transmission lines. Due to their combination of many advantages of metal waveguides and planar transmission lines, more and more domestic Foreign scholars have used this technology in the research of microwave and millimeter wave power synthesis. However, in the application of multi-channel power splitter/combiner, the synthesis efficiency of the tree-structured SIW/HMSIW combiner is still low, while the bandwidth of the comb-structured and resonant-structured SIW/HMSIW combiner is relatively narrow. The root cause of the limited bandwidth is that the phase difference between the ports of the SIW/HMSIW output is frequency dependent. In fact, this problem exists in combiners based on common transmission lines. In order to solve this problem, some scholars have proposed a combiner based on a radial structure transmission line. Since the circuit structure has the characteristics of rotational symmetry, the balance of the amplitude and phase of each output port has nothing to do with frequency, which can effectively improve the power combiner. bandwidth.

When designing a power combiner, many important issues such as how to make full use of the space of the metal heat dissipation structure and the position of the power amplifier tube must also be considered. For example, when the combined power is high, an overly compact combiner structure will cause poor heat dissipation and spatial coupling of active devices, seriously affecting the combining effect. Therefore, it is still of great significance to design a power divider/combiner with broadband, low loss and good heat dissipation structure.

Contents of the invention

In order to increase the output power of the microwave communication system and expand the coverage of the transmitted signal, the present invention provides a broadband power combiner based on radial lines and substrate integrated waveguides, which has wide frequency bandwidth, low insertion loss, simple manufacture, and easy integration with It has the advantages of planar circuit integration and good heat dissipation performance.

To achieve the above object, the present invention adopts the following technical solutions:

A broadband power combiner based on radial lines and substrate integrated waveguides, comprising two back-to-back power dividing structures and at least one vertical connector connecting the power dividing structures;

The power division structure includes coaxial-radial line conversion structure, full-mode-half-mode substrate integrated waveguide power divider, gradual microstrip transition section and output microstrip line; the coaxial line in the coaxial-radial line conversion structure Including the inner conductor and the outer conductor wall, the outer conductor wall is fixed on the dielectric substrate; the dielectric substrate is provided with a central through hole, and a matching patch is provided between the inner conductor and the central through hole, and the central through hole is connected downwards to the dielectric substrate. Bottom layer of copper; the bottom of the outer conductor wall is provided with a cylindrical air cavity on the same centerline as the central through hole, the inner conductor extends into the cylindrical air cavity, the cylindrical air cavity and the dielectric substrate below it, and the bottom layer of copper , and the outer conductor wall above it constitutes a radial line; the full-mode-half-mode substrate-integrated waveguide power divider includes a gradual-type substrate-integrated waveguide, a substrate-integrated waveguide, and a symmetrically distributed two-way half-mode substrate-integrated waveguide , one end of the SIW is connected to the radial line through a tapered SIW, and the other end is truncated into two symmetrically distributed half-mode SIWs, and the output signal of each half-mode SIW is gradually changed The type microstrip line segment is output to an output microstrip line;

The vertical connector includes two vertical microstrip lines, and one end of each vertical microstrip line is connected to the output microstrip line of one of the power division structures, and the other end is connected to the output microstrip line of the other power division structure; the vertical microstrip line with an amplifier.

Furthermore, each power division structure can be used as a power divider alone, and the number of each power division structure full-mode-half-mode substrate integrated waveguide power divider is four, and each power division structure outputs the microstrip line The number is eight, and the number of vertical connectors is four.

After the input signal is sent to the coaxial-radial line conversion structure, the transmission mode of the transverse electromagnetic wave (hereinafter referred to as TEM) is converted into a radial line mode through a step impedance converter composed of the inner conductor of the coaxial line and the central through hole. Radial propagation. Since the inner and outer diameters of the coaxial line are standard values, by adjusting the diameter of the central through hole and the matching patch, as well as the height and diameter of the cylindrical air cavity, a broadband can be obtained between the input coaxial line and the radial line match. The radial line mode signal is broadband-matched to the TE10 mode through the tapered substrate-integrated waveguide segment, and transmitted to four full-mode-half-mode substrate-integrated waveguide power splitters with equal amplitude and phase, and further divided into eight signals with equal amplitude and phase. The eight-channel signals are amplified by their respective amplifiers on the vertical microstrip line, and then synthesized into one signal through the reverse-installed power division structure, and finally restored to TEM transmission mode output on the coaxial line of the reverse-installed power division structure.

Furthermore, the overall structure of the power combiner is rotationally symmetrical about the center point, and the amplitude balance and phase balance between the output signals of the power division structure have nothing to do with frequency, thereby increasing the working bandwidth. Two power division structures and four vertical connectors are symmetrically distributed on each surface of the metal radiator. Two power division structures and four vertical connectors are distributed on each surface of the metal radiator, which can save heat dissipation space, evenly distribute heat sources, reduce spatial coupling between coplanar circuits, and improve system stability.

Furthermore, the tapered substrate-integrated waveguide segment is composed of four metallized through holes, and the angle between the connecting line between two adjacent through holes and the horizontal direction and the vertical direction is 45 degrees. By adjusting the spacing of the metallized through holes, broadband matching can be obtained between the radial lines and the substrate integrated waveguide, and the matching bandwidth can be increased while ensuring the rotational symmetry of the structure.

Further, there is a metal radiator between the two back-to-back symmetrically arranged power division structures; the bottom copper clad is a whole piece of seamless ground copper foil; the top copper clad, bottom copper clad and The metal radiators are in seamless and close contact with screws to ensure good electrical conductivity and heat dissipation.

Furthermore, the substrate-integrated waveguide is processed by ordinary printed circuit board technology from the top copper clad, bottom copper clad and metallized through holes.

Furthermore, the vertical connector is fixed on the side of the metal radiator by screws, and the two ends of each vertical microstrip line are respectively connected to the output microstrip lines on the same side of the two power division structures. The output microstrip line is directly connected to the vertical microstrip line with the same impedance on the vertical connector. By adjusting the length of the slanted part of the output microstrip line, the spacing between adjacent vertical microstrip lines can be changed to adapt to different operating frequency bands and Amplifier size.

In addition, the output signal of each half-mode substrate integrated waveguide is output to an output microstrip line through the tapered microstrip line segment, and adjusting the angle between adjacent tapered microstrip line segments can reduce the the degree of coupling between them. At the same time, by adjusting the width and length of the tapered microstrip line segment, broadband matching can be obtained between the half-mode substrate integrated waveguide and the output microstrip line.

Furthermore, an isolation resistor is welded on the gap between the two half-mode substrate integrated waveguides, and the size and position of the isolation resistor and the gap width between the two half-mode substrate integrated waveguides can be adjusted to ensure that adjacent Optimizing both transmission and reflection characteristics while maintaining isolation between ports.

Furthermore, the diameter of the central through hole is different from the diameter of the inner conductor of the coaxial line, forming a step impedance matching, and converting the TEM transmission mode of the input coaxial line into a radial line mode.

Beneficial effects: (1) The present invention adopts the radial line combined with the substrate integrated waveguide and the half-mode substrate integrated waveguide, which can increase the number of output signals while ensuring that the output channels are equal in amplitude and in phase, which is conducive to integrating more (2) The structure of the present invention is rotationally symmetric, so that the amplitude balance and phase balance between the output signals have nothing to do with frequency, thereby increasing the working bandwidth; (3) Each of the present invention Combining coaxial line step impedance transformation, matching patch, tapered substrate integrated waveguide, tapered microstrip line and other technologies in some connections, good return loss characteristics can be obtained in a wide frequency band, thus ensuring that the signal is transmitted over a wide frequency band Effective transmission, distribution and synthesis in the band; (4) The signal transmission part of the present invention adopts the substrate integrated waveguide and the half-mode substrate integrated waveguide, which can obtain lower insertion loss than the conventional planar microstrip type transmission line, thereby increasing Combination efficiency; (5) vertical microstrip is directly connected between the two power dividers in the power combiner provided by the present invention, without any conversion, and the power amplifier can be placed on the vertical microstrip line, so that the power combiner It is beneficial to the integration with the active circuit; (6) The power combiner provided by the present invention makes full use of each surface of the metal radiator, saves the heat dissipation space, and can make the installation positions of the power amplifier modules evenly distributed in space, while the heat source The uniform distribution is beneficial to the overall heat dissipation; (7) The installation positions of the power amplifier modules of the power combiner provided by the present invention, the positions of the power synthesis and distribution circuits are not on the same plane, which is conducive to reducing the spatial coupling between power amplifiers and ensuring the system stability.

Description of drawings

Fig. 1 is a structural diagram of a broadband power combiner provided by the present invention.

Fig. 2 is a T-T' sectional view in Fig. 1.

Fig. 3 is S-S' sectional view in Fig. 1.

Fig. 4 is the test results of transmission characteristics and reflection characteristics when the power dividing structure provided by the present invention is used alone as a power divider.

Fig. 5 is a test result of the transmission characteristic and reflection characteristic of the broadband power combiner provided by the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

The function of the power divider/combiner is to distribute the input signal according to certain amplitude and phase requirements. As shown in Figure 1, the broadband power combiner based on radial lines and substrate integrated waveguides of the present invention includes two back-to-back symmetrical Set power division structure A and four vertical connectors B connecting power division structure A. Wherein, each power division structure A consists of three parts. The first part is a coaxial-radial line conversion structure 10, the second part is four full-mode-half-mode substrate integrated waveguide power splitters 8, and the third part is eight gradient microstrip transition sections 19 and output microstrip Line 20; power division structure A divides the input signal into 8 signals of equal amplitude and same phase, and each power division structure A can be independently designed and used independently as a power divider. The vertical connector B includes two vertical microstrip lines 21; all structures are rotationally symmetrical about the center point.

In this example, the input signal is transmitted from a standard 50 ohm SMA coaxial connector to a coaxial-radial line conversion structure 10, the coaxial line is composed of an outer conductor wall 4 and an inner conductor 11, as shown in Figure 2 Here, the outer conductor wall 4 is fixed by screws 6 and maintains good electrical and thermal contact with the top layer copper clad 1 of the dielectric substrate 7 . The dielectric substrate 7 is Taconic's TLX-8, with a dielectric constant of 2.55 and a thickness of 1.524 mm.

In the coaxial-radial line conversion structure 10 , the input signal is converted from the TEM transmission mode of the coaxial line to the radial line mode through a step impedance converter composed of the coaxial inner conductor 11 and the central through hole 14 . The central through hole 14 is located in the dielectric substrate 7 and connects to the underlying copper clad 2 downwards. The bottom copper clad 2 is a whole piece of seamless ground copper foil. Between the inner conductor 11 and the central through hole 14 , that is, on the surface of the dielectric substrate 7 , a matching patch 13 is designed. The outer conductor wall 4 is machined to form a cylindrical air cavity 12 . The cavity, the dielectric substrate 7 below it, the bottom layer of copper 2 , and the outer conductor wall 4 above constitute a radial line 15 . Since the inner and outer diameters of the 50 ohm coaxial line are standard values, by adjusting the diameters of the central through hole 14 and the matching patch 13, as well as the height and diameter of the cylindrical air cavity 12, the input coaxial line and radial direction can be adjusted. Broadband matching is obtained between lines 15. On the basis of determining the size of the 50 ohm SMA coaxial connector, this example sets the end plane of the radial line 15 as the ideal matching layer (PML), by adjusting the diameters of the central through hole 14 and the matching patch 13, and the cylindrical air The diameter and height of the cavity 12 make the return loss of the coaxial input port optimal in a wide frequency band. In this example, copper foil is used for the matching patch 13 and attached to the surface of the dielectric substrate 7. The diameter of the matching patch 13 is 5.3 mm, and the diameter of the central through hole 14 is 3.4 mm. In addition, the height and diameter of the cylindrical air cavity 12 are 0.5mm and 26mm respectively,

The input signal is excited by the inner conductor of the coaxial-radial line conversion structure 10, converted into a radial line mode and then propagated radially around, and the radial line mode is matched to the TE10 mode through the tapered substrate integrated waveguide section 9 broadband , and transmit them to four full-mode-half-mode substrate integrated waveguide power splitters 8 with equal amplitude and phase, and further divide them into eight signals with equal amplitude and phase. Thus, the function of component structure A to distribute the input signal according to certain amplitude and phase requirements is completed.

The full-mode-half-mode substrate-integrated waveguide power splitter 8 includes a tapered substrate-integrated waveguide section 9, a substrate-integrated waveguide 16 and two half-mode substrate-integrated waveguides 17 symmetrically distributed. The diameter of the metallized through-holes constituting the substrate-integrated waveguide 16 and the half-mode substrate-integrated waveguide 17 is 1mm, and the hole pitch is 1.5mm. The tapered substrate-integrated waveguide section 9 is composed of four metallized through holes. The angle between the connection line between two adjacent through holes and the horizontal direction (vertical direction) is 45 degrees, so that the matching bandwidth can be increased while ensuring the rotational symmetry of the structure, and the length of the tapered substrate integrated waveguide section 9 can be adjusted (ie The spacing of metallized vias) can improve and optimize the transmission and reflection characteristics in a wide frequency band. In this example, the pitch of the metallized through-holes of the tapered substrate integrated waveguide section 9 is 1.1 mm. The substrate integrated waveguide 16 is processed by ordinary printed circuit board technology from the top layer copper clad 1, the bottom layer copper clad 2 and the metallized through hole 3. Two half-mode substrate integrated waveguides 17 are formed by etching open-circuit slits on the top layer copper clad 1 . Since the slot does not affect the field distribution of the TE ₁₀ mode, the power splitter itself is broadband. An isolation resistor 18 is welded on the gap between the two half-mode substrate integrated waveguides 17 . By adjusting the size and position of the isolation resistor 18 and the gap width between the two half-mode substrate integrated waveguides 17, the transmission and reflection characteristics can be optimized while ensuring the isolation between adjacent ports. In this example, the isolation resistance 18 is 100 ohms, the distance from the slot terminal is 6.7 mm, and the gap width between the two half-mode substrate integrated waveguides 17 is 0.4 mm.

The output signal of each half-mode substrate integrated waveguide 17 passes through the tapered microstrip line segment 19 and is output to the output microstrip line 20 . Adjusting the included angle between adjacent tapered microstrip line segments 19 can reduce the coupling degree between adjacent microstrip ports. At the same time, by adjusting the width and length of the tapered microstrip line segment 19 , broadband matching can be obtained between the half-mode substrate integrated waveguide 17 and the output microstrip line 20 . In this example, the included angle between adjacent tapered microstrip line segments 19 is 30 degrees, and the length and width thereof are 24 mm and 6 mm, respectively.

In this example, the gradient microstrip line segment 19 and the output microstrip line 20 adopt a standard 50 ohm microstrip line, and the output microstrip line 20 is directly connected to the vertical microstrip line 21 with the same impedance on the vertical connector B, as shown in the figure 3. The vertical connector B is fixed on the side of the metal radiator 5 by screws 6 to ensure good electrical conductivity and heat dissipation. The signals of each channel are amplified by their respective amplifiers on the vertical microstrip line 21 and synthesized into one signal by the reversely installed power division structure A on the bottom layer, and finally output on the coaxial line at the bottom layer. It should be particularly pointed out that by adjusting the length of the slanted part of the output microstrip line 20, the distance between adjacent vertical microstrip lines 21 can be changed to adapt to different operating frequency bands and power amplifier sizes.

In this example, first design its width according to the single-mode propagation condition of the substrate-integrated waveguide 16, and then connect a full-mode-half-mode substrate-integrated waveguide power divider 8 to the two-way gradient microstrip line segment 19 and the output microstrip line 20 , and weld an isolation resistor 18 on the gap between the two half-mode integrated waveguides 17 . Adjust the size and position of the isolation resistor 18, the width of the gap between the two half-mode integrated waveguides 17, the length and width of the gradient microstrip line segment width 19, and the angle between adjacent gradient microstrip line segment widths 19. Optimize transmission and reflection characteristics while maintaining isolation between adjacent ports.

After the input signal is sent to the coaxial-radial line conversion structure 10, the TEM transmission mode is converted into a radial line mode through a step impedance converter composed of the inner conductor 11 of the coaxial line and the central through hole 14, and radially propagates to the surroundings . Since the inner and outer diameters of the coaxial line are standard values, by adjusting the diameters of the central through hole 14 and the matching patch 13, as well as the height and diameter of the cylindrical air cavity 12, the input coaxial line and the radial line can be adjusted. Broadband matching is obtained between. The radial line mode signal is broadband-matched to the TE ₁₀ mode through the tapered substrate integrated waveguide segment 9, and is transmitted to four full-mode-half-mode substrate integrated waveguide power splitters 8 with equal amplitude and phase, and further divided into equal amplitude and phase Eight channels of signals, each signal is sent to the vertical microstrip line 21 with the same impedance on the vertical connector B through the gradual microstrip line segment 19 and the output microstrip line 20 . The eight signals are amplified by their respective amplifiers on the vertical microstrip line 21, and then synthesized into one signal through the reverse operation of the power division structure A installed in reverse, and finally restored to the TEM transmission mode on the coaxial line of the power division structure A installed in reverse output.

This example implements a broadband power combiner based on radial lines and substrate integrated waveguides in the 4.5GHz-11GHz frequency band, and tests its overall performance in the 3GHz-13GHz frequency band. First, test the single power division structure A device. This structure can independently complete the power distribution of eight channels of signals. Since all ports are rotationally symmetrical, it is only necessary to test the transmission coefficient and reflection coefficient from the input port to any output microstrip line port 20 of the power division structure A, as shown in Figure 4. In the 4.5GHz to 11.2GHz frequency band, the insertion loss is generally lower than 1dB, and the minimum value is 0.4dB. The return loss is better than -12dB. The results of this test include the loss of the output port SMA connector.

Use four vertical connectors B to connect the above-mentioned pair of power division structures A back to back to form a two-port network. The test results of this network are shown in Fig. 5. In the frequency band from 4.8GHz to 11GHz, the insertion loss has a maximum value of 1.9dB and a minimum value of 0.9dB. The return loss is better than -10dB.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principles of the present invention, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (9)

1. the synthesizer of the broadband power based on radial transmission line and substrate integration wave-guide, is characterized in that: comprise that two merit separation structures that arrange back-to-back are connected the vertical connector of merit separation structure with at least one;

Described merit separation structure comprises coaxially-radial transmission line transformational structure (10), full mould-half module substrate integrated wave guide power splitter (8), gradation type microstrip transition section (19) and export microstrip line (20); Described coaxial-radial transmission line transformational structure (10) in coaxial line comprise inner wire (11) and outer conductor wall (4), described outer conductor wall (4) is fixed on dielectric substrate (7); Described dielectric substrate (7) is provided with central through hole (14), between described inner wire (11) and central through hole (14), is provided with coupling paster (13), and described central through hole (14) connects bottom downwards and covers copper (2); Described outer conductor wall (4) bottom is provided with cylinder air cavity (12), described inner wire (11) extends in cylinder air cavity (12), described cylinder air cavity (12) and the dielectric substrate (7), the bottom that are positioned at its below cover copper (2), and the outer conductor wall (4) of the side of being located thereon forms radial transmission line (15); Described full mould-half module substrate integrated wave guide power splitter (8) comprises gradation type substrate integration wave-guide (9), substrate integration wave-guide (16) and symmetrical two-way half module substrate integrated wave guide (17), one end of described substrate integration wave-guide (16) is connected with radial transmission line (15) by gradation type substrate integration wave-guide (9), the other end blocks as the symmetrical half module substrate integrated wave guide of two-way (17), and the output signal of each road half module substrate integrated wave guide (17) exports on an output microstrip line (20) through gradation type microstrip line section (19);

Described vertical connector comprises two vertical microstrip lines (21), and every vertical microstrip line (21) one ends are connected with the output microstrip line (20) of one of them merit separation structure, and the other end is connected with the output microstrip line (20) of another merit separation structure; Described vertical microstrip line (21) is provided with amplifier.

2. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1; it is characterized in that: the number of described full mould-half module substrate integrated wave guide power splitter (8) is four; the number of each merit separation structure output microstrip line (20) is eight, and the number of described vertical connector is four.

3. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1, it is characterized in that: described two are provided with metallic heat dissipating part (5) back-to-back between symmetrically arranged merit separation structure; It is the seamless ground connection Copper Foil of a monoblock that described bottom covers copper (2); Described outer conductor wall (4) covers copper (1) with the top layer of dielectric substrate (7), bottom covers copper (2) and all by screw (6), keeps seamless close contact with metallic heat dissipating part (5).

4. according to claim 2 or 3 described a kind of synthesizers of broadband power based on radial transmission line and substrate integration wave-guide, it is characterized in that: this power combiner is about the central point Rotational Symmetry; Described two merit separation structures and four vertical connectors are symmetrically distributed in each surface of metallic heat dissipating part (5).

5. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1, it is characterized in that: described gradation type substrate integration wave-guide section (9) is comprised of four plated-through holes (3), and the angle of the line between adjacent two through hole and horizontal direction and vertical direction is 45 degree.

6. according to claim 3 or 5 described a kind of synthesizers of broadband power based on radial transmission line and substrate integration wave-guide is characterized in that: described substrate integration wave-guide (16) by top layer cover copper (1), bottom covers copper (2) and plated-through hole (3) forms through ordinary printed circuit board processes.

7. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1, it is characterized in that: described vertical connector is fixed on metallic heat dissipating part (5) side by screw (6), and every vertical microstrip line (21) two ends are connected with the output microstrip line (20) of two merit separation structure homonymies respectively.

8. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1, is characterized in that: on the gap between described two-way half module substrate integrated wave guide (17), be welded with isolation resistance (18).

9. a kind of synthesizer of broadband power based on radial transmission line and substrate integration wave-guide according to claim 1, it is characterized in that: the diameter of described central through hole (14) is different from the diameter of coaxial inner conductor (11).

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