Controllable power optional bandwidth multi-channel microwave upconverter

Abstract

The utility model discloses a controllable power selectable bandwidth's multichannel microwave up converter relates to radio communication technical field, including the mixer, switch filter group structure, amplifier and numerical control attenuator who connects in order series, the switch filter group structure includes first radio switch and second radio switch, as the first radio switch of beginning, its common end and mixer electric connection, as the second radio switch of end, its common end and amplifier electric connection. The utility model discloses a switch filter group structure that is composed of two radio switches and multiple different bandwidth's band pass filter is adopted, and the selectivity of signal path and bandwidth is cleverly realized, and user only needs to control the gating state of radio switch, can with signal routing to the filter of specific bandwidth to change the working bandwidth of system dynamically to adapt to different communication rate and anti -interference demand.

Description

Technical Field

[0001] This utility model relates to the field of microwave radio frequency communication technology, specifically to a multi-channel microwave upconverter with controllable power and selectable bandwidth. Background Technology

[0002] In communication systems, to efficiently transmit radio signals and achieve reliable transmission, appropriate channels must be configured, and the physical constraint that antenna size and signal wavelength must be on the same order of magnitude must be fully considered. Typically, the antenna size needs to be proportional to 1 / 4λ or 5 / 8λ of the wavelength to achieve effective radiation. Therefore, to reduce antenna size and facilitate deployment, the baseband signal carrying information must be modulated onto a higher-frequency carrier wave; this process is called up-conversion. Specifically, up-conversion uses a microwave frequency converter to shift the low-frequency modulated signal to a higher-frequency radio frequency band before transmission via the antenna.

[0003] However, traditional upconversion technology is usually limited by fixed output channels, resulting in insufficient system flexibility. Users cannot dynamically adjust parameters such as bandwidth according to actual applications, and the transmission method is relatively rigid, making it difficult to adapt to the diverse needs of modern communication. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a multi-channel microwave upconverter with controllable power and selectable bandwidth. By changing the selection state of the switch, different signal paths can be selected, thereby realizing the function of multiple selectable channels and breaking the limitation of "fixed output channel".

[0005] To solve the above problems, this utility model provides the following technical solution:

[0006] A multi-channel microwave upconverter with controllable power and selectable bandwidth includes a mixer, a switched filter bank structure, an amplifier, and a digitally controlled attenuator connected in series in sequence.

[0007] The switched filter bank structure includes a first radio frequency switch and a second radio frequency switch. The first radio frequency switch, which serves as the beginning, has its common terminal electrically connected to the mixer. The second radio frequency switch, which serves as the end, has its common terminal electrically connected to the amplifier.

[0008] The switch filter bank structure also includes multiple bandpass filters with different bandwidths. The selection terminals of the first RF switch and the second RF switch are configured as corresponding multiple groups. The input and output terminals of each bandpass filter are electrically connected to the selection terminals of the first RF switch and the second RF switch, respectively, so as to selectively connect one of them.

[0009] As a further embodiment of this utility model: two bandpass filters are provided, one of which has a center frequency of 102 MHz, a bandwidth of 20 MHz, and an insertion loss of 1 dB, and the other has a center frequency of 102 MHz, a bandwidth of 40 MHz, and an insertion loss of 1 dB.

[0010] As a further embodiment of this invention: the output terminal of the numerically controlled attenuator is electrically connected to a power divider.

[0011] As a further embodiment of this invention, the power divider is provided with two output interfaces.

[0012] As a further embodiment of this invention, it also includes a first input interface for receiving intermediate frequency signals, and the first input interface is electrically connected to the mixer.

[0013] As a further embodiment of this invention, it also includes a second input interface for receiving local oscillator signals, and the second input interface is electrically connected to the mixer.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By employing a switch filter bank structure consisting of two RF switches and multiple bandpass filters with different bandwidths, the selectivity of signal path and bandwidth is cleverly achieved. Users only need to control the selection state of the RF switches to route the signal to a filter with a specific bandwidth, thereby dynamically changing the operating bandwidth of the system to adapt to different communication rates and anti-interference requirements.

[0016] 2. Furthermore, the sequential series design of the mixer, amplifier, and digitally controlled attenuator forms a complete and efficient RF chain. The amplifier ensures signal gain, while the introduction of the digitally controlled attenuator enables precise and digital control of the output power. This allows the upconverter to simultaneously meet the three key requirements of "multi-channel," "selectable bandwidth," and "controllable power," solving the problem of fixed and rigid functions in traditional equipment.

[0017] 3. By specifically defining the center frequency of both bandpass filters as 120MHz, and setting the bandwidths to 20MHz and 40MHz respectively, users are provided with clear and typical choices: the 20MHz bandwidth can be used in scenarios requiring higher signal selectivity and resistance to adjacent channel interference, while the 40MHz bandwidth supports higher data transmission rates.

[0018] 4. Connecting the output of the digitally controlled attenuator to the power divider allows the high-quality RF signal, after frequency conversion, filtering, amplification, and power adjustment, to be simultaneously distributed to multiple subsequent circuits or antenna systems. This enhances integration and functionality, enabling the system to drive multiple loads or support multiple antenna applications. It also improves system utilization and avoids the need to repeatedly configure multiple upconverters for multiple output requirements, effectively saving space and cost. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the circuit principle of this utility model.

[0021] In the diagram: 1. Mixer; 2. Amplifier; 3. Digitally controlled attenuator; 4. First RF switch; 5. Second RF switch; 6. Bandpass filter; 7. Power divider; 8. Output interface; 9. First input interface; 10. Second input interface. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 As shown, a multi-channel microwave upconverter with controllable power and selectable bandwidth includes:

[0024] (1) First input interface 9, used to receive intermediate frequency signals;

[0025] (2) The second input interface 10 is used to receive the local oscillator signal;

[0026] (3) Mixer 1, whose first input terminal is connected to the first input interface 9 via a microstrip line, and whose second input terminal is connected to the second input interface 10 via a microstrip line;

[0027] (4) The first radio frequency switch 4 has a common terminal connected to the radio frequency output terminal of the mixer 1 via a microstrip line. The first radio frequency switch 4 has N select terminals, and N≥2.

[0028] (5) N bandpass filters 6 with different bandwidths, the input of each bandpass filter 6 is connected to a selection terminal of the first radio frequency switch 4 through a corresponding microstrip line;

[0029] (6) The second radio frequency switch 5 has N gating terminals, where N≥2, and each gating terminal is connected to the output terminal of the corresponding bandpass filter 6 via a microstrip line;

[0030] (7) Amplifier 2, whose input terminal is connected to the common terminal of the second RF switch 5 via a microstrip line;

[0031] (8) The input terminal of the digitally controlled attenuator 3 is connected to the output terminal of the amplifier 2 via a microstrip line;

[0032] (9) Power divider 7, whose input is connected to the output of digitally controlled attenuator 3 via microstrip line, and power divider 7 has multiple outputs;

[0033] (10) Multiple output interfaces 8 are connected to multiple output terminals of power divider 7 via corresponding microstrip lines.

[0034] (a) The selected models of the above-mentioned components are as follows:

[0035] (1) Set mixer 1 to model HMC553;

[0036] (2) Set N in both the first RF switch 4 and the second RF switch 5 to 2, then both are single-pole double-throw switches, and both are selected as HMC232.

[0037] (3) When N in the first RF switch 4 and the second RF switch 5 is 2, the number of bandpass filters 6 is also two. One bandpass filter 6 is set to have a center frequency of 120 MHz, a bandwidth of 20 MHz, and an insertion loss of 1 dB; the other bandpass filter 6 has a center frequency of 120 MHz, a bandwidth of 40 MHz, and an insertion loss of 1 dB.

[0038] (4) Set the model of the digitally controlled attenuator 3 to HMC424, with an attenuation range of 0-32dB and a step of 1dB;

[0039] (5) When the number of output terminals of the power divider 7 is set to two, the power divider 7 is a two-way power divider, and the model is a microstrip Wilkinson power divider; therefore, the number of output interfaces 8 is also adapted to be two.

[0040] (II) Specific connection relationships of the above-mentioned devices: Pin 1 (IFIN) of mixer 1 is connected to the first input interface 9 via a microstrip line ML1 with a 50-ohm characteristic impedance; pin 2 (LO IN) is connected to the second input interface 10 via a microstrip line ML2; pin 3 (RF OUT) is connected to the common terminal (RFC) of the first RF switch 4 via a microstrip line ML3. The first RF switch 4's selector terminal 1 (RF1) is connected to the input terminal of one of the bandpass filters 6 via a microstrip line ML4; the first RF switch 4's selector terminal 2 (RF2) is connected to the input terminal of the other bandpass filter 6 via a microstrip line ML5. The output terminals of the two bandpass filters 6 are connected to the second RF switch 5's selector terminal 1 (RF1) and selector terminal 2 (RF2) via microstrip lines ML6 and ML7, respectively. The common terminal (RFC) of the second RF switch 5 is connected to the input terminal of amplifier 2 via microstrip line ML8. The output terminal of amplifier 2 is connected to the input terminal of digitally controlled attenuator 3 via microstrip line ML9. The output terminal of digitally controlled attenuator 3 is connected to the input terminal of microstrip Wilkinson power divider via microstrip line ML10. The first output terminal of microstrip Wilkinson power divider is connected to one of the output interfaces 8 via microstrip line ML11. The second output terminal of microstrip Wilkinson power divider is connected to another output interface 8 via microstrip line ML12.

[0041] (III) Related Control Relationships: The selection states of the first RF switch 4 and the second RF switch 5 are jointly determined by control signals K1 CTRL and K2 CTRL (via the control interface, not fully shown in the figure), respectively, to select filter paths with different bandwidths. The attenuation value of the digitally controlled attenuator 3 is set by the control signal U3 CTRL (via SPI).

[0042] (IV) Working Principle: The intermediate frequency (IF) signal is input from the first input interface 9 and reaches the IF IN terminal of mixer 1 via ML1; the local oscillator (LO) signal is input from the second input interface 10 and reaches the LO IN terminal of mixer 1 via ML2. The RF signal generated by mixing is output from the RF OUT terminal of mixer 1 and reaches the RFC terminal of the first RF switch 4 via ML3. According to the K1 CTRL signal, the first RF switch 4 selects the signal to the filter path with the required bandwidth, for example, via ML4 to one of the bandpass filters 6 with a center frequency of 120MHz, a bandwidth of 20MHz, and an insertion loss of 1dB, or via ML5 to another bandpass filter 6 with a center frequency of 120MHz, a bandwidth of 40MHz, and an insertion loss of 1dB. The filtered signal reaches the corresponding port RF1 / RF2 of the second RF switch 5 via ML6 / ML7. According to the control signal, the second RF switch 5 outputs the selected signal to the input terminal of amplifier 2 via ML8. The amplified signal is sent to the input terminal of digitally controlled attenuator 3 via the output terminal of amplifier 2 and ML9. After setting the attenuation amount according to the U3CTRL signal, the signal is sent to the input of the power divider via ML10. The power divider splits the signal into two paths, which are sent to the two output interfaces 8 via ML11 and ML12 respectively.

[0043] It should be noted that the description of the electrical connections, layout, control relationships, and working principles of the aforementioned devices in this application is intended to enable those skilled in the art to clearly understand the technical solution of this application. The multi-channel microwave upconverter in this utility model is merely a hardware platform constructed by connecting physical components together through a circuit structure. In use, this multi-channel microwave upconverter can be implemented in conjunction with existing software; however, it must be pointed out that the software used in conjunction with this multi-channel microwave upconverter is neither an innovative part of this utility model nor a component of it.

[0044] With the combined effect of software, this utility model has the advantage of allowing users to select different signal paths, thereby realizing multiple selectable channel functions. However, the protection of this utility model only extends to the hardware network composed of physical components and microstrip lines, and does not involve the improvement and protection of software.

[0045] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A multi-channel microwave upconverter with controllable power and selectable bandwidth, characterized in that, It includes a mixer (1), a switched filter bank structure, an amplifier (2), and a digitally controlled attenuator (3) connected in series in sequence; The switch filter bank structure includes a first radio frequency switch (4) and a second radio frequency switch (5). The first radio frequency switch (4), which is the beginning, has its common terminal electrically connected to the mixer (1). The second radio frequency switch (5), which is the end, has its common terminal electrically connected to the amplifier (2). The switch filter bank structure also includes multiple bandpass filters (6) with different bandwidths. The selection terminals of the first RF switch (4) and the second RF switch (5) are set to corresponding multiple groups. The input and output terminals of each bandpass filter (6) are electrically connected to the selection terminals of the first RF switch (4) and the second RF switch (5) respectively, so as to selectively connect one of them.

2. The multi-channel microwave upconverter with controllable power and selectable bandwidth according to claim 1, characterized in that, The bandpass filter (6) is configured as two, one of which has a center frequency of 120 MHz, a bandwidth of 20 MHz, and an insertion loss of 1 dB, and the other has a center frequency of 120 MHz, a bandwidth of 40 MHz, and an insertion loss of 1 dB.

3. A multi-channel microwave upconverter with controllable power and selectable bandwidth according to claim 1 or 2, characterized in that, The output terminal of the numerically controlled attenuator (3) is electrically connected to a power divider (7).

4. A multi-channel microwave upconverter with controllable power and selectable bandwidth according to claim 3, characterized in that, The power divider (7) has two output interfaces (8).

5. A multi-channel microwave upconverter with controllable power and selectable bandwidth according to claim 1 or 2, characterized in that, It also includes a first input interface (9) for receiving intermediate frequency signals, and the first input interface (9) is electrically connected to the mixer (1).

6. A multi-channel microwave upconverter with controllable power and selectable bandwidth according to claim 1 or 2, characterized in that, It also includes a second input interface (10) for receiving local oscillator signals, and the second input interface (10) is electrically connected to the mixer (1).

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