Microstrip power divider circuit of active dummy load
The microstrip power divider with an active dummy load, using a constant current source circuit, addresses power consumption and heating issues by stabilizing power absorption, enhancing the service life of satellite receivers and dividers.
Patent Information
- Application Number
- CN202421018109.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Existing microstrip power dividers with DC isolation ports face issues of increased power consumption and heating due to fixed resistors acting as dummy loads, which affect the service life of satellite receivers and dividers.
A microstrip power divider with an active dummy load, incorporating a constant current source circuit to absorb DC current, including a bias resistor, reference voltage source, and transistor, to maintain stable power consumption and enable receiver startup.
The active dummy load reduces power consumption and heating, prolonging the service life of the power divider and satellite receivers by maintaining stable power absorption, even under varying voltage conditions.
Smart Images
Figure CN222191108U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power dividers, in particular to a microstrip power divider circuit with an active dummy load. Background Art
[0002] Microstrip power dividers are used to distribute satellite signals, such as satellite TV signals or GPS signals. They are widely used in satellite digital TV, geographic data collection, surveying and mapping, vehicle monitoring and scheduling and navigation services, aviation and navigation, military, time and synchronization, mechanical control, mass consumer applications and other fields.
[0003] The microstrip power dividers currently on the market are usually designed with a microstrip structure, which has lower signal loss. Since the satellite signal is weak, it is usually used with an active antenna. The active antenna has a small signal amplifier inside, and the amplification requires DC power supply, so the power divider needs to have a DC feeding function. The microstrip power dividers currently used in satellite signal distribution have a DC feeding function, and the basic microstrip distribution structure is DC interconnected, that is, the DC of each distribution port including the input port is interconnected. When there is a DC voltage on one port, there will be a DC voltage on other ports, which will affect the connected receiver. Therefore, this type of power divider usually reserves one channel for DC feeding, and the other ports are DC isolated.
[0004] However, some receivers require DC current output to start normally. After the DC isolation process, the receiver with the DC isolation port will not be able to start due to the lack of DC current output.
[0005] The solution currently used in the market is to add a 200 ohm resistor as a dummy load to the DC isolation port to absorb the DC current of the receiver to start the receiver. Since the resistor is fixed, the power on the resistor P = U*U / R, and the power changes with the square rate of the voltage, that is, when the voltage increases, the power on the resistor increases sharply, which not only increases the load of the satellite receiver, but also the resistor power is very large, and the microstrip power divider heats up seriously, thus affecting the service life of the microstrip power divider and the satellite receiver. Utility Model Content
[0006] In order to solve the technical defects raised in the above background technology, the purpose of the utility model is to provide a microstrip power divider with an active dummy load, which can avoid the increase of power consumption due to voltage increase or too many branches and increase its service life.
[0007] The utility model adopts the following technical solutions:
[0008] A microstrip power divider circuit with active dummy load, comprising:
[0009] An input port, electrically connected to an external antenna, for receiving a satellite signal received from the external antenna;
[0010] A first distribution port, one end of which is electrically connected to a satellite receiver, and the other end of which is electrically connected to the input port, for receiving a satellite signal transmitted by the input port;
[0011] a second distribution port, one end of which is electrically connected to the satellite receiver and the other end of which is electrically connected to the input port, the second distribution port being used to output direct current to the input port to provide direct current to the antenna and to receive satellite signals transmitted by the input port;
[0012] The constant current source circuit is electrically connected between the input port and the first distribution port, and is used for absorbing direct current to enable the external satellite receiver to start the working mode.
[0013] Optionally, the constant current source circuit includes:
[0014] A bias resistor, one end of which is electrically connected between the first distribution port and the input port, and is used to bias the DC power delivered by the first distribution port;
[0015] A reference voltage source, an input end of which is electrically connected to the bias resistor and the other end of which is grounded, and is used to absorb the bias direct current transmitted by the bias resistor;
[0016] The transistor, with a collector and a base electrically connected to the two ends of the bias resistor respectively and an emitter grounded, is used to drive the reference voltage source.
[0017] Optionally, the constant current source circuit further includes: a first resistor, one end of which is electrically connected to the emitter of the transistor and the other end of which is grounded.
[0018] Optionally, a DC blocking capacitor is further included, wherein the DC blocking capacitor is electrically connected between the input port and the first distribution port and is used to isolate the direct current between the first distribution port and the second distribution port.
[0019] Optionally, the current value range of the constant current source is 8mA to 12mA.
[0020] In summary, the beneficial effects of the utility model are:
[0021] By setting the input port, it can be electrically connected to an external antenna, so that the satellite signal can be received through the antenna. By setting the first distribution port and the second distribution port, an external satellite receiver can be connected, so that the satellite signal can be output to the satellite receiver through the first distribution port and the second distribution port, so as to achieve a one-to-two effect. In addition, by electrically connecting a constant current source circuit between the first distribution port and the input port, part of the load DC can be absorbed, so that the satellite receiver of the first distribution port can be turned on to the working mode. At the same time, by setting the constant current source circuit, the load of the satellite receiver will not increase when the voltage increases, thereby avoiding severe heating of the microstrip power divider and prolonging its service life.
[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a circuit diagram of an embodiment of the utility model.
[0024] Description of reference numerals in the figures:
[0025] 1. Input port; 2. First distribution port; 3. Second distribution port; 4. Constant current source circuit; R1, bias resistor; 41, reference voltage source; Q1, transistor; R2, first resistor; C1, DC blocking capacitor. DETAILED DESCRIPTION
[0026] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.
[0027] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.
[0028] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.
[0029] like Figure 1 As shown, an embodiment of the present application provides a microstrip power divider circuit with an active dummy load, including an input port 1, electrically connected to an external antenna, for receiving satellite signals received from the external antenna; a first distribution port 2, one end of which is electrically connected to a satellite receiver, and the other end is electrically connected to the input port 1, for receiving the satellite signal transmitted by the input port 1; a second distribution port 3, one end of which is electrically connected to a satellite receiver, and the other end is electrically connected to the input port 1, and the second distribution port 3 is used to output direct current to the input port 1 to provide direct current to the antenna and receive the satellite signal transmitted by the input port 1; a constant current source circuit 4, electrically connected between the input port 1 and the first distribution port 2, for absorbing direct current to enable the external satellite receiver to start the working mode.
[0030] In the embodiment of the present application, the input port 1 is used to electrically connect an external antenna, so that the satellite signal can be transmitted to the first distribution port 2 and the second distribution port 3, and then the satellite signal can be transmitted to an external satellite receiver. It should be understood that since the antenna needs to consume direct current, the satellite receiver electrically connected through the second distribution port 3 provides direct current, so that the antenna can be provided with working current. Further, since the satellite receiver needs to receive the load current before it can start working (the minimum load starting current of the satellite receiver is generally 4mA), since the satellite receiver is electrically connected to the first distribution port 2, the satellite receiver electrically connected to the first distribution port 2 also needs to output a certain direct current to allow the satellite receiver to detect the access of the antenna. Therefore, by setting the above-mentioned constant current source circuit 4 to absorb a certain direct current, it can play the role of a dummy load, so that the satellite receiver can judge that the load current is connected and then start the working mode. By setting the constant current source circuit 4, as the voltage increases, the power absorbed by the load of the constant current source circuit 4 increases linearly, unlike the resistive load, its power increases at a square rate, and the power consumption increases more slowly, which can support a larger DC voltage range. Generally, the value of the constant current source circuit 4 can be set to 10mA. Under the condition of 18V DC feed voltage, the power absorbed by the load of the constant current source circuit 4 is: 18V*10mA=0.18W. Under the same feed current, if the commonly used resistive load scheme on the market is adopted, that is, a 200Ω dummy load, the power absorbed by the dummy load is: 18V*18V / 200Ω=1.62W. Under high feed voltage, the power consumption of the load using the constant current source circuit 4 is smaller than that of the resistive load scheme adopted on the market. Therefore, by setting the constant current source circuit 4, the power consumption of the microstrip power divider and the satellite receiver can be reduced, thereby reducing the heating temperature and thus increasing the service life.
[0031] Optional, such as Figure 1 As shown, the constant current source circuit 4 includes a bias resistor R1, one end of which is electrically connected between the first distribution port 2 and the input port 1, and is used to bias the DC power transmitted by the first distribution port 2; a reference voltage source 41, an input end of which is electrically connected to the bias resistor R1, and the other end is grounded, and is used to absorb the bias DC power transmitted by the bias resistor R1; a transistor Q1, the collector and the base are respectively electrically connected to the two ends of the bias resistor R1, and the emitter is grounded, and is used to drive the reference voltage source 41.
[0032] In an embodiment of the present application, one end of the above-mentioned bias resistor R1 is electrically connected between the input port 1 and the first distribution port 2. By setting the bias resistor R1, a DC bias can be provided for the reference voltage source 41, so that the reference voltage source 41 can be adjusted and stabilized. The input end of the above-mentioned reference voltage source 41 is electrically connected to the output end of the bias resistor R1. By setting the reference voltage source 41, a DC current can be absorbed. Since the satellite receiver needs to have a load connected to start working, the above-mentioned scheme can enable the satellite receiver to start the working mode. The collector of the above-mentioned transistor Q1 is electrically connected to the input end of the bias resistor R1, the base is electrically connected to the output end of the bias resistor R1, and the emitter is connected to the first resistor R2 (grounded again through the first resistor R2). By setting the transistor Q1, the driving capability of the reference voltage source 41 can be improved.
[0033] Optional, such as Figure 1 As shown, the constant current source circuit 4 further includes a first resistor R2, one end of which is electrically connected to the emitter of the transistor Q1, and the other end of which is grounded.
[0034] In the embodiment of the present application, one end of the first resistor R2 is electrically connected to the emitter of the transistor Q1 , and the other end is grounded. By setting the first resistor R2 , the stability and linearity of the constant current source circuit 4 can be improved.
[0035] Optional, such as Figure 1 As shown, it also includes a DC isolation capacitor C1, which is electrically connected between the input port 1 and the first distribution port 2 and is used to isolate the direct current between the first distribution port 2 and the second distribution port 3.
[0036] In the embodiment of the present application, the above-mentioned DC blocking capacitor C1 is arranged between the input port 1 and the first distribution port 2. By setting the DC blocking capacitor C1, the DC power between the first distribution port 2 and the second distribution port 3 can be isolated, and at the same time, the satellite signal between the antenna and the satellite receiver will not be isolated. Furthermore, the DC power between the first distribution port 2 and the second distribution port 3 can be blocked from each other, so that even if the first distribution port 2 and the second distribution port 3 both output DC power, there will be no mutual influence, thereby enriching the present embodiment and avoiding the reduction of power consumption due to the increase of voltage.
[0037] Optional, such as Figure 1 As shown, the current value range of the constant current source is 8mA to 12mA. The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A microstrip power divider circuit with active dummy load, characterized in that: include: An input port (1), electrically connected to an external antenna, for receiving a satellite signal received from the external antenna; A first distribution port (2), one end of which is electrically connected to a satellite receiver, and the other end of which is electrically connected to the input port (1), and is used to receive the satellite signal transmitted by the input port (1); a second distribution port (3), one end of which is electrically connected to the satellite receiver, and the other end of which is electrically connected to the input port (1), the second distribution port (3) being used to output direct current to the input port (1) to provide direct current to the antenna and to receive satellite signals transmitted by the input port (1); The constant current source circuit (4) is electrically connected between the input port (1) and the first distribution port (2) and is used to absorb direct current to enable the external satellite receiver to start the working mode.
2. The active dummy-load microstrip power divider circuit according to claim 1, characterized in that: The constant current source circuit (4) comprises: A bias resistor (R1), one end of which is electrically connected between the first distribution port (2) and the input port (1), and is used to bias the direct current transmitted by the first distribution port (2); A reference voltage source (41), an input end of which is electrically connected to the bias resistor (R1) and the other end of which is grounded, and is used to absorb the bias direct current transmitted by the bias resistor (R1); The transistor (Q1) has a collector and a base electrically connected to the two ends of the bias resistor (R1) respectively, and an emitter grounded, and is used to drive the reference voltage source (41).
3. The active dummy-load microstrip power divider circuit according to claim 2, characterized in that: The constant current source circuit (4) further comprises: A first resistor (R2) has one end electrically connected to the emitter of the transistor (Q1) and the other end grounded.
4. The active dummy-load microstrip power divider circuit according to claim 1, characterized in that: It also includes a DC isolation capacitor (C1), which is electrically connected between the input port (1) and the first distribution port (2) and is used to isolate the direct current between the first distribution port (2) and the second distribution port (3).
5. The active dummy-load microstrip power divider circuit according to claim 1, characterized in that: The current value range of the constant current source is 8mA to 12mA.