A low noise amplifier

Abstract

The utility model provides a low-noise amplifier, comprising: a housing, provided with a waveguide cavity, the waveguide cavity is used to transmit a microwave signal propagating along a first direction; a first circuit board, arranged in the housing; a probe, one end of which is fixed to the housing and the other end is located in the waveguide cavity, the probe is electrically connected to the first circuit board, the length of the probe extends along a second direction, the second direction is perpendicular to the first direction; and a tuning and matching element, movably assembled in the housing, the tuning and matching element and the probe are spaced and coaxially arranged, and the tuning and matching element can move in the second direction toward or away from the probe. Since a vertically excited signal receiving mode is formed in the low-noise amplifier, the distance between the active tuning and matching element and the probe can be changed by changing the distance between the active tuning and matching element and the probe, thereby changing the nature and size of the susceptance, and realizing the regulation of the microwave signal propagating in the waveguide cavity, and the regulation mode is simple, which is conducive to achieving the performance indicators of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of amplifiers, in particular to a low noise amplifier. Background Art

[0002] The excitation of a low noise amplifier (LNA) generally refers to the process of providing an input signal to the amplifier. The excitation of a low noise amplifier can be achieved by directly connecting a signal source to the input of the amplifier, or by transmitting a microwave signal to the amplifier's probe through a waveguide.

[0003] In the related art, low noise amplifiers generally use parallel excitation to receive microwave signals, specifically, the length extension direction of the microstrip conversion probe is set parallel to the transmission direction of the microwave signal. However, since multiple LNAs need to work in parallel to receive or amplify signals in microwave signal processing to improve the receiving ability, gain and reliability of the signal processing system, when the microwave signal is transmitted in the waveguide cavity, it is difficult to adjust the microwave signal, making it impossible to meet the performance indicators of the product. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a low noise amplifier, aiming to solve the problem in the related art that the low noise amplifier uses a parallel excitation method to receive microwave signals, which makes it difficult to adjust the microwave signals.

[0005] In order to solve the above technical problems, the utility model provides a low noise amplifier, comprising:

[0006] A housing is provided with a waveguide cavity, wherein the waveguide cavity is used to transmit a microwave signal propagating along a first direction;

[0007] A first circuit board is disposed in the housing;

[0008] a probe, one end of which is fixed to the housing and the other end of which is located in the waveguide cavity, the probe being electrically connected to the first circuit board, the length of the probe extending along a second direction, the second direction being perpendicular to the first direction; and

[0009] A tuning and matching element is movably assembled on the housing, the tuning and matching element is spaced apart and coaxially arranged with the probe, and the tuning and matching element can move along the second direction toward or away from the probe.

[0010] Optionally, the housing is provided with a mounting hole communicating with the waveguide cavity, the mounting hole is coaxially arranged with the probe, and the tuning and matching element is located in the mounting hole.

[0011] Optionally, the first circuit board is provided with a connection hole, and one end of the probe away from the waveguide cavity is located in the connection hole and connected to the first circuit board.

[0012] Optionally, the low noise amplifier further comprises a dielectric body, the dielectric body is fixed in the shell and is insulated, the probe passes through the dielectric body and extends into the connecting hole, and the probe is fixed to the dielectric body.

[0013] Optionally, the shell is further provided with a first accommodating cavity and a connecting hole, the first circuit board is arranged in the first accommodating cavity; the connecting hole connects the waveguide cavity and the first accommodating cavity respectively, and the dielectric body is fixed in the connecting hole.

[0014] Optionally, the waveguide cavity is provided with a first side wall, a second side wall and a third side wall, the first side wall and the third side wall are respectively connected to two sides of the second side wall, the probe is provided on the second side wall, and the probe is located in the middle position between the first side wall and the third side wall.

[0015] Optionally, the low noise amplifier further includes a waveguide flange, wherein the waveguide flange is disposed at one end of the shell where the waveguide cavity is disposed, the waveguide cavity is formed with an opening on the waveguide flange, and the opening is used for inputting the microwave signal.

[0016] Optionally, the waveguide flange is provided with an annular positioning groove, and the opening is located in the positioning groove.

[0017] Optionally, the low noise amplifier further includes a first interface component for signal output, wherein the first interface component is disposed on the outside of the housing and is electrically connected to the first circuit board.

[0018] Optionally, the low noise amplifier further comprises a second interface component for accessing a power source, the second interface component is arranged on the outside of the housing, and the second interface component is electrically connected to the first circuit board.

[0019] Compared with the related art, the low noise amplifier in the utility model has the following beneficial effects: since the microwave signal propagates along the first direction in the waveguide cavity, the length of the probe extends along the second direction, and the second direction is perpendicular to the first direction, a vertically excited signal receiving mode is formed in the low noise amplifier, so that the distance between it and the probe can be changed by active tuning and matching elements, thereby changing the nature and size of its susceptance, thereby realizing the regulation of the microwave signal propagating in the waveguide cavity, and the regulation method is simple, which is conducive to achieving the performance indicators of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a low noise amplifier provided by an embodiment of the utility model;

[0022] Figure 2 It is an exploded diagram of a low noise amplifier provided by an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of a low noise amplifier provided by an embodiment of the utility model.

[0024] In the accompanying drawings, the various reference numerals represent: 1, shell; 11, outer shell; 111, waveguide cavity; 1111, first side wall; 1112, second side wall; 1113, third side wall; 112, first accommodating cavity; 12, mounting hole; 13, first cover plate; 14, second cover plate; 2, probe; 3, dielectric body; 4, waveguide flange; 41, positioning groove; 5, first interface assembly; 6, second interface assembly. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships 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 referred device or element 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.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0028] Example:

[0029] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the utility model provides a low noise amplifier, including a housing 1, a first circuit board (not shown in the figure), a probe 2 and a tuning and matching element (not shown in the figure). The housing 1 is provided with a waveguide cavity 111, and the waveguide cavity 111 is used to transmit a microwave signal propagating along a first direction; the first circuit board is arranged in the housing 1; one end of the probe 2 is fixed to the housing 1 and the other end is located in the waveguide cavity 111, the probe 2 is electrically connected to the first circuit board, and the length of the probe 2 extends along a second direction, and the second direction is perpendicular to the first direction; the tuning and matching element is movably assembled in the housing 1, the tuning and matching element is spaced apart and coaxially arranged with the probe 2, and the tuning and matching element can move in the second direction toward or away from the probe 2.

[0030] Since the microwave signal propagates along the first direction in the waveguide cavity 111, the length of the probe 2 extends along the second direction, and the second direction is perpendicular to the first direction, thereby forming a vertically excited signal receiving mode in the low-noise amplifier, so that the distance between it and the probe 2 can be changed through active tuning and matching elements, thereby changing the properties and size of its electrical susceptance, thereby realizing the regulation of the microwave signal propagating in the waveguide cavity 111. The regulation method is simple, which is conducive to achieving the performance indicators of the product.

[0031] It should be noted that when the tuning and matching elements are moved closer to the probe 2, the tuning and matching elements can be equivalent to parallel inductors; when the tuning and matching elements are moved farther away from the probe 2, the tuning and matching elements can be equivalent to parallel capacitors; when the tuning and matching elements are moved to a moderate distance from the probe 2, the tuning and matching elements can be equivalent to an LC series resonant circuit in parallel with the main transmission line, and when resonant, can be equivalent to a short-circuit resistance filter, thereby regulating the microwave signal propagating in the waveguide cavity 111.

[0032] See also Figure 1 and Figure 3The shell 1 is provided with a mounting hole 12 connected to the waveguide cavity 111. The mounting hole 12 is coaxially arranged with the probe 2. The tuning and matching element is located in the mounting hole 12, which can ensure that the tuning and matching element can move along the second direction toward or away from the probe 2, and at the same time, can ensure that the tuning and matching element is coaxially arranged with the probe 2.

[0033] According to actual needs, the mounting hole 12 may be a threaded hole, and the tuning and matching element may be a screw, which is threadedly connected to the threaded hole, so that the tuning and matching element can be moved to change the distance between it and the probe 2; or Figure 3 As shown, the mounting hole 12 is a stepped hole, a nut is arranged in the stepped hole, the tuning and matching element can be a screw, and the screw and the nut are threadedly connected; or, the tuning and matching element can be a pin, and the mounting hole 12 can be a pin hole, and the distance between the tuning and matching element and the probe 2 can be changed by replacing pins of different lengths.

[0034] The first circuit board is provided with a connection hole, and one end of the probe 2 away from the waveguide cavity 111 is located in the connection hole and connected to the first circuit board, so as to realize the electrical connection between the first circuit board and the probe 2. Preferably, the probe 2 is loosely matched with the connection hole, and the probe 2 is fixed to the first circuit board by soldering with solder paste, so as to improve the connection stability between the probe 2 and the first circuit board; wherein the probe 2 can be a gold-plated copper column.

[0035] See also Figure 2 and Figure 3 The low noise amplifier also includes a dielectric body 3, which is fixed in the shell 1 and insulated. The probe 2 passes through the dielectric body 3 and extends into the connecting hole. The probe 2 is fixed to the dielectric body 3. The provision of the dielectric body 3 to fix the probe 2 can avoid the need to rely on the first circuit board to fix the probe 2, which is beneficial to improving the connection stability between the probe 2 and the first circuit board; moreover, the dielectric body 3 is insulated and will not interfere with the microwave signal transmission of the probe 2.

[0036] See also Figure 2 and Figure 3 The shell 1 is also provided with a first accommodating cavity 112 and a connecting hole, and the first circuit board is arranged in the first accommodating cavity 112; the connecting holes are respectively connected to the waveguide cavity 111 and the first accommodating cavity 112, and the dielectric body 3 is fixed in the connecting hole, that is, the dielectric body 3 is located between the waveguide cavity 111 and the first accommodating cavity 112, so that one end of the probe 2 passes through the dielectric body 3 to be connected with the first circuit board, and the other end extends into the waveguide cavity 111.

[0037] See also Figure 1 and Figure 3The waveguide cavity 111 is provided with a first side wall 1111, a second side wall 1112 and a third side wall 1113, the first side wall 1111 and the third side wall 1113 are respectively connected to the two sides of the second side wall 1112, the probe 2 is provided on the second side wall 1112, and the probe 2 is located in the middle position between the first side wall 1111 and the third side wall 1113, which is conducive to the probe 2 coupling the microwave signal transmitted in the waveguide cavity 111 to the first circuit board. According to actual needs, the probe 2 can also be provided at other positions between the first side wall 1111 and the third side wall 1113, such as a position closer to the first side wall 1111 or closer to the third side wall 1113.

[0038] See also Figure 1 and Figure 2 The low noise amplifier further includes a waveguide flange 4, which is disposed at one end of the housing 1 provided with a waveguide cavity 111. The waveguide cavity 111 is formed with an opening on the waveguide flange 4, and the opening is used to input a microwave signal. A microwave generating device is installed on the waveguide flange 4, and the microwave generating device emits a microwave signal propagating in a first direction, and the microwave signal enters the waveguide cavity 111 through the opening, and the probe 2 couples the microwave signal in the waveguide cavity 111 to the first circuit board.

[0039] See also Figure 1 and Figure 2 The waveguide flange 4 is provided with an annular positioning groove 41 , the opening of which is located in the positioning groove 41 , and the positioning groove 41 is used for installing a sealing ring, and the sealing ring is used for improving the connection sealing between the microwave generating device and the housing 1 .

[0040] See also Figure 1 and Figure 2 The low noise amplifier also includes a first interface component 5 for signal output. The first interface component 5 is arranged on the outside of the shell 1, and the first interface component 5 is electrically connected to the first circuit board. The first interface component 5 and the probe 2 are respectively located at two ends of the shell 1. An amplification circuit is provided on the first circuit board. The microwave signal coupled to the first circuit board by the probe 2 is transmitted to the first interface component 5 after amplification, and is output through the first interface component 5.

[0041] See also Figure 1 and Figure 2 The low noise amplifier further includes a second interface component 6 for accessing a power source, the second interface component 6 being disposed outside the housing 1, and the second interface component 6 being electrically connected to the first circuit board, thereby supplying power to the first circuit board. The second interface component 6 may be disposed on a side surface of the housing 1.

[0042] In some embodiments, a second accommodating cavity which is not connected to the first accommodating cavity 112 is further provided in the housing 1, and the first accommodating cavity 112 and the second accommodating cavity are respectively located on opposite sides of the housing 1. The low noise amplifier further includes a battery and a second circuit board, both of which are disposed in the second accommodating cavity, and the battery is electrically connected to the first circuit board, the second circuit board, and the second interface assembly 6, and the second circuit board is used to control the charging and discharging of the battery.

[0043] See also Figure 1 and Figure 2 In some embodiments, the housing 1 includes a shell 11, a first cover plate 13, and a second cover plate 14. The first accommodating cavity 112 and the second accommodating cavity are respectively arranged on opposite sides of the shell 11. The first cover plate 13 is fixed to one side of the shell 11 and covers the first accommodating cavity 112. The second cover plate 14 is fixed to the other side of the shell 11 and covers the second accommodating cavity. The first cover plate 13 and the second cover plate 14 are both fixed to the shell 11 by screws for easy disassembly.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low noise amplifier, characterized in that: include: A housing is provided with a waveguide cavity, wherein the waveguide cavity is used to transmit a microwave signal propagating along a first direction; A first circuit board is disposed in the housing; A probe, one end of which is fixed to the housing and the other end of which is located in the waveguide cavity, the probe being electrically connected to the first circuit board, the length of the probe extending along a second direction, and the second direction is perpendicular to the first direction; as well as, A tuning and matching element is movably assembled on the housing, the tuning and matching element is spaced apart and coaxially arranged with the probe, and the tuning and matching element can move along the second direction toward or away from the probe.

2. The low noise amplifier according to claim 1, characterized in that: The housing is provided with a mounting hole communicating with the waveguide cavity, the mounting hole is coaxially arranged with the probe, and the tuning and matching element is located in the mounting hole.

3. The low noise amplifier according to claim 1, characterized in that: The first circuit board is provided with a connection hole, and one end of the probe away from the waveguide cavity is located in the connection hole and connected to the first circuit board.

4. The low noise amplifier according to claim 3, characterized in that: The low noise amplifier further comprises a dielectric body, which is fixed in the shell and insulated, the probe passes through the dielectric body and extends into the connecting hole, and the probe is fixed to the dielectric body.

5. The low noise amplifier according to claim 4, characterized in that: The shell is further provided with a first accommodating cavity and a communicating hole, the first circuit board is arranged in the first accommodating cavity; the communicating hole is respectively connected with the waveguide cavity and the first accommodating cavity, and the dielectric body is fixed in the communicating hole.

6. The low noise amplifier according to claim 1, characterized in that: The waveguide cavity is provided with a first side wall, a second side wall and a third side wall, the first side wall and the third side wall are respectively connected to two sides of the second side wall, the probe is provided on the second side wall, and the probe is located in the middle position between the first side wall and the third side wall.

7. The low noise amplifier according to claim 1, characterized in that: The low noise amplifier further includes a waveguide flange, which is disposed at one end of the housing where the waveguide cavity is disposed. The waveguide cavity is provided with an opening on the waveguide flange, and the opening is used for inputting the microwave signal.

8. The low noise amplifier according to claim 7, characterized in that: The waveguide flange is provided with an annular positioning groove, and the opening is located in the positioning groove.

9. The low noise amplifier according to claim 1, characterized in that: The low noise amplifier further comprises a first interface component for signal output, wherein the first interface component is arranged outside the housing and is electrically connected to the first circuit board.

10. The low noise amplifier according to claim 1, characterized in that: The low noise amplifier also includes a second interface component for accessing a power source, wherein the second interface component is disposed outside the housing and is electrically connected to the first circuit board.

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