Dual-channel radio frequency conditioning device

Abstract

The invention discloses a dual-channel radio frequency conditioning device, which relates to the technical field of radio frequency microwaves and comprises a wave band switch, a first numerical control attenuator, a second numerical control attenuator, a preselection filter bank and a power divider, one end of the band switch is connected with the first input port and the second input port, the other end of the band switch is connected with one end of the first numerical control attenuator, the other end of the first numerical control attenuator is connected with one end of the preselection filter bank, and the other end of the preselection filter bank is connected with one end of the second numerical control attenuator. The other end of the second numerical control attenuator is connected with one end of the power divider, and the other end of the power divider is connected with the first output port and the second output port. According to the invention, input signals with different frequencies can be respectively output from different output paths through filtering gain, so that the frequency range of the output signals is enlarged. And meanwhile, the adaptability of the two channels in a practical application scene is improved.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency microwave technology, and in particular to a dual-channel radio frequency conditioning device. Background Art

[0002] There are various types of signal source equipment serving different fields and corresponding to different working scenarios. Common ones include sinusoidal signal generators, swept frequency signal generators, function signal generators, pulse and digital signal generators, modulation signal generators, arbitrary waveform generators, etc.

[0003] In the field of modulated signal generators, the RF in the prior art distributes multiple groups of different filter settings so that the working range is mostly fixed at a fixed working frequency, the frequency coverage range is narrow, and only a single-channel signal can be output. At the same time, there are also problems such as many RF components and a large corresponding device size.

[0004] Therefore, in terms of RF requirements, it cannot meet higher frequency configuration and regulation, and can only output single-channel signals, which still has limitations in actual application scenarios. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies of the prior art, specifically the problems of narrow frequency coverage and limited single-channel output, and specifically provide a dual-channel RF conditioning device, as follows:

[0006] The present invention provides a dual-channel radio frequency conditioning device, and the specific technical solution is as follows:

[0007] It includes: a band switch, a first digitally controlled attenuator, a second digitally controlled attenuator, a preselection filter group, and a power divider;

[0008] One end of the band switch is connected to the first input port and the second input port respectively, the other end of the band switch is connected to one end of the first digitally controlled attenuator, the other end of the first digitally controlled attenuator is connected to one end of the preselection filter group, the other end of the preselection filter group is connected to one end of the second digitally controlled attenuator, the other end of the second digitally controlled attenuator is connected to one end of the power divider, and the other end of the power divider is respectively connected to the first output port and the second output port.

[0009] The beneficial effects of a dual-channel radio frequency conditioning device provided by the present invention are as follows:

[0010] By setting the band switch to form a loop with the first input port and the second input port respectively, a dual-channel signal output path is formed, which allows input signals of different frequencies to be output from different output paths through filtering gain, thereby increasing the frequency range of the output signal. At the same time, compared with a single channel, the dual-channel output signal has higher adaptability in practical application scenarios.

[0011] Based on the above solution, the present invention can also be improved as follows.

[0012] Further, it also includes: a first limiter;

[0013] One end of the first limiter is connected to the first input port, and the other end of the first limiter is connected to one end of the band switch.

[0014] Further, it also includes: a second limiter;

[0015] One end of the second limiter is connected to the second input port, and the other end of the second limiter is connected to one end of the band switch.

[0016] Further, it also includes: a wave limiter;

[0017] One end of the wave limiter is connected to one end of the first amplitude limiter, and the other end of the wave limiter is connected to one end of the band switch.

[0018] Further, it also includes: a first low noise amplifier;

[0019] One end of the first low noise amplifier is connected to one end of the wave limiter, and the other end of the first low noise amplifier is connected to one end of the band switch.

[0020] Further, it also includes: a second low noise amplifier;

[0021] One end of the second low noise amplifier is connected to one end of the second limiter, and the other end of the second low noise amplifier is connected to one end of the band switch.

[0022] Further, it also includes: a third low noise amplifier;

[0023] One end of the third low noise amplifier is connected to the other end of the second digitally controlled attenuator, and the other end of the third low noise amplifier is connected to one end of the power divider.

[0024] Further, it also includes: a fourth low noise amplifier;

[0025] One end of the fourth low noise amplifier is connected to the other end of the power divider, and the other end of the fourth low noise amplifier is connected to the first output port.

[0026] Further, it also includes: a fifth low noise amplifier;

[0027] One end of the fifth low noise amplifier is connected to the other end of the power divider, and the other end of the fifth low noise amplifier is connected to the second output port.

[0028] Further, it also includes: a relay;

[0029] One end of the relay is connected to the first input port. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 A schematic diagram of the structure of a dual-channel radio frequency conditioning device according to an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of an extended structure of a dual-channel radio frequency conditioning device according to an embodiment of the present invention;

[0033] Figure 3 A schematic top view of a shielding structure of a dual-channel radio frequency conditioning device according to an embodiment of the present invention;

[0034] Figure 4 A schematic front view of a shielding structure of a dual-channel radio frequency conditioning device according to an embodiment of the present invention;

[0035] Figure 5 It is a schematic diagram of a right side view of a shielding structure of a dual-channel radio frequency conditioning device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, a dual-channel radio frequency conditioning device according to an embodiment of the present invention includes: a band switch SPDT, a first digitally controlled attenuator ATT1, a second digitally controlled attenuator ATT2, a preselection filter group and a power divider;

[0038] One end of the band switch SPDT is respectively connected to the first input port IN1 and the second input port IN2, the other end of the band switch SPDT is connected to one end of the first digitally controlled attenuator ATT1, the other end of the first digitally controlled attenuator ATT1 is connected to one end of the preselection filter group, the other end of the preselection filter group is connected to one end of the second digitally controlled attenuator ATT2, the other end of the second digitally controlled attenuator ATT2 is connected to one end of the power divider, and the other end of the power divider is respectively connected to the first output port OUT1 and the second output port OUT2.

[0039] The beneficial effects of a dual-channel radio frequency conditioning device provided by the present invention are as follows:

[0040] By setting the band switch SPDT to form a loop with the first input port IN1 and the second input port IN2, a dual-channel signal output path is formed, which allows input signals of different frequencies to be output from different output paths through filtering gain, thereby increasing the frequency range of the output signal. At the same time, compared with a single channel, the dual-channel output signal has higher adaptability in practical application scenarios.

[0041] One end of the band switch SPDT is connected to the first input port IN1 and the second input port IN2 respectively, the other end of the band switch SPDT is connected to one end of the first digitally controlled attenuator ATT1, the other end of the first digitally controlled attenuator ATT1 is connected to one end of the preselection filter group, the other end of the preselection filter group is connected to one end of the second digitally controlled attenuator ATT2, the other end of the second digitally controlled attenuator ATT2 is connected to one end of the power divider, and the other end of the power divider is connected to the first output port OUT1 and the second output port OUT2 respectively. Wherein:

[0042] The band switch SPDT refers to: a single-pole double-throw switch used to switch bands or select different circuits. It can be divided according to specifications, the number of poles, the number of bits and the number of insulating sheet layers; according to the structure, it can be divided into toggle type, rotary type, push-button type, piano-key type, etc. In this embodiment, the band switch SPDT is used to form a loop with the first input port IN1 and the second input port IN2 respectively, forming a dual-channel signal output path.

[0043] The advantages of adopting the above scheme are: the use of band switch SPDT allows dual-channel signals to share part of the same signal processing process, saving processing complexity. In addition, the band switch SPDT enables the RF conditioning device to form a dual-channel signal output path, avoiding the problem that the transmission speed and performance of single-channel input and output are limited when processing large amounts of data, and that it is not as convenient and flexible as dual-channel input and output when facing system expansion and upgrades. At the same time, dual channels can transmit multiple data at the same time, and can transmit and process data faster than a single channel; it can process signals in different frequency ranges, and has a wider range of application scenarios; and dual channels can support more device connections, improving the scalability of the system, and are more flexible and convenient than single-channel input and output devices.

[0044] A digital attenuator is an electronic device that controls the strength or power of a signal. Its working principle is based on the change of resistance. A digital attenuator usually consists of an adjustable resistor network, and the attenuation of the signal is controlled by adjusting the value of the resistor. When the resistance value is large, the signal will be greatly attenuated when passing through the digital attenuator, while when the resistance value is small, the attenuation of the signal will be reduced.

[0045] In this embodiment, the first digital controlled attenuator ATT1 and the second digital controlled attenuator ATT2 are used to adjust the signal level, reduce the power of the signal, prevent the signal from being overloaded during subsequent processing, and ensure the linearity and stability of the signal processing process. The reason for setting two data attenuators is that the attenuation step of a single digital controlled attenuator is insufficient, and the use of two digital controlled attenuators can increase the attenuation step. The reason why the two digital controlled attenuators are located in different positions is that impedance matching is required to avoid large reflections of the signal due to impedance mismatch, which affects the signal quality.

[0046] A preselected filter bank is a group of filters that have a common input or a common output after addition, used to cancel aliasing distortion.

[0047] A power splitter refers to a device that splits one input signal energy into two or more outputs of equal or unequal energy. In this embodiment, the power splitter is used to split the input signal of different frequency bands into two outputs, further realizing the function of dual-channel output.

[0048] like Figure 2 The schematic diagram of the extended structure of a dual-channel radio frequency conditioning device shown further includes: a first limiter LIM1;

[0049] One end of the first limiter LIM1 is connected to the first input port IN1, and the other end of the first limiter LIM1 is connected to one end of the band switch SPDT.

[0050] A limiter is a circuit that can flatten the signal voltage amplitude within a limited range. Its function is to limit the output signal amplitude within a certain range, that is, when the input voltage exceeds or falls below a certain reference value, the output voltage will be limited to a certain level (called the limit level) and will no longer change with the input voltage.

[0051] In another embodiment of the present solution, the first limiter LIM1 is used to limit the amplitude of the input signal in the first input port IN1, with the purpose of reducing the signal amplitude so that the processed signal can be processed by the subsequent low noise amplifier LNA to prevent signal overload.

[0052] Further, it also includes: a second limiter LIM2;

[0053] One end of the second limiter LIM2 is connected to the second input port IN2, and the other end of the second limiter LIM2 is connected to one end of the band switch SPDT.

[0054] In another embodiment of the present solution, similar to the first limiter LIM1, the second limiter LIM2 is used to limit the amplitude of the input signal of the second input port IN2, but the difference is that the operating frequency range is different.

[0055] The advantage of adopting the above solution is that the amplitudes of the dual-channel input signals can be limited within a certain range respectively by using the first limiter LIM1 and the second limiter LIM2.

[0056] Further, it also includes: a wave limiter BSF;

[0057] One end of the wave limiter BSF is connected to one end of the first amplitude limiter LIM1, and the other end of the wave limiter BSF is connected to one end of the band switch SPDT.

[0058] The BSF wave limiter refers to a wave limiter circuit that allows signals in a certain frequency band to pass through and suppresses signals, interference and noise in other frequency bands.

[0059] The advantage of adopting the above scheme is that the harmonic signal of a specific frequency band is limited by the limiter BSF. The harmonic spurious signal of a specific frequency band existing in 100-850MHz is the most serious. The limiter BSF can suppress the harmonic spurious signal of the specific frequency band by limiting the wave of the specific frequency band, thereby effectively improving the communication quality. It can be imagined that when processing signals of different frequency bands, if a certain frequency band contains serious harmonic spurious signals, the limiter BSF can be added by limiting the wave to achieve the effect of suppressing spurious signals.

[0060] In this embodiment, a dual-channel RF conditioning device is used to process the 100MHz~850MHz input signal and the 850MHz~6000MHz input signal respectively. Among them, the 100MHz~850MHz input signal is transmitted through the first input port IN1. This part of the signal needs to limit the signal of some specific frequency bands. Therefore, a limiter BSF is designed to perform limit processing. At the same time, the 850MHz~6000MHz input signal can be transmitted through the second input port IN2. After passing through the single-pole double-throw band switch SPDT, one signal is synthesized and then the input signal amplitude is adjusted through the first digitally controlled attenuator ATT1, and then the power is divided into two outputs through the power divider. Among them, the specific frequency band refers to the frequency band with serious harmonic spurious, which needs to be processed by the limiter BSF; the conditional distinction of the specific frequency band can be limited by the artificially set frequency range.

[0061] Further, it also includes: a first low noise amplifier LNA1;

[0062] One end of the first low noise amplifier LNA1 is connected to one end of the wave limiter BSF, and the other end of the first low noise amplifier LNA1 is connected to one end of the band switch SPDT.

[0063] In another embodiment of the present scheme, the input signal with a band of 100MHz to 850MHz is obtained after the limiter BSF is limited, and the first low-noise amplifier LNA1 is used to reduce the signal noise and increase the signal strength to obtain a low-noise amplified signal, so as to improve the signal-to-noise ratio of the received signal and ensure the accuracy of the received signal.

[0064] Further, it also includes: a second low noise amplifier LNA2;

[0065] One end of the second low noise amplifier LNA2 is connected to one end of the second limiter LIM2 , and the other end of the second low noise amplifier LNA2 is connected to one end of the band switch SPDT.

[0066] It should be noted that the first low noise amplifier LNA1 and the second low noise amplifier LNA2 are located at the front end of signal reception. The difference between them is that they work in different frequency bands. Their main purpose and function is to amplify the weak signal received from the antenna. Since the low noise amplifier has high gain and low noise, it can reduce the noise coefficient of the entire RF conditioning module and improve the sensitivity of signal reception.

[0067] Further, it also includes: a third low noise amplifier LNA3;

[0068] One end of the third low noise amplifier LNA3 is connected to the other end of the second digitally controlled attenuator ATT2, and the other end of the third low noise amplifier LNA3 is connected to one end of the power divider.

[0069] In another embodiment of the present solution, the third low noise amplifier LNA3 functions to amplify the signal to avoid attenuation and noise introduction of the signal when passing through a subsequent high impedance circuit, thereby ensuring the quality and strength of the signal in subsequent processing.

[0070] Further, it also includes: a fourth low noise amplifier LNA4;

[0071] One end of the fourth low noise amplifier LNA4 is connected to the other end of the power divider, and the other end of the fourth low noise amplifier LNA4 is connected to the first output port OUT1 .

[0072] Further, it also includes: a fifth low noise amplifier LNA5;

[0073] One end of the fifth low noise amplifier LNA5 is connected to the other end of the power divider, and the other end of the fifth low noise amplifier LNA5 is connected to the second output port OUT2.

[0074] In another embodiment of the present solution, the fourth low noise amplifier LNA4 and the fifth low noise amplifier LNA5 respectively reduce the noise level and increase the signal strength of the signal after the power divider divides the signal into two, thereby improving the communication quality.

[0075] The advantage of adopting the above solution is that the signal power can be amplified by using a low noise amplifier.

[0076] Further, it also includes: a relay;

[0077] One end of the relay is connected to the first input port IN1.

[0078] Relays are used for overload protection and short circuit protection to ensure safe operation of circuits.

[0079] The benefits of adopting the above solution are:

[0080] The working frequency of the RF conditioning device is 100MHz~6000MHz. The input signals of 100MHz~850MHz and 850MHz~6000MHz are respectively limited and amplified with low noise through two inputs. It can also meet the requirements of limiting the specific frequency band in 100-850MHz. It can also flexibly configure various signals to greatly improve the stability of the signal. At the same time, the dual-channel output of the signal can be achieved through the band switch SPDT, limiter, wave limiter BSF, low noise amplifier, digital attenuator, gain amplifier, and bandpass filter. The integration of multifunctional conditioning of very high frequency (VHF), ultra high frequency (UHF), and ultra high frequency (SHF) input signals (100MHz~6000MHz) is realized. The RF conditioning device uses two RF inputs and outputs one in two at the end, and can meet the requirements of limiting the specific frequency band in 100-850MHz. The integrated multifunctional RF conditioning device also has the characteristics of high reliability and miniaturization.

[0081] It is important to know that based on Figure 1 Based on the principle of 100-6000MHz, it can also cover signals in other frequency bands besides 100-6000MHz as needed. When processing signals in different frequency bands, if a certain frequency band contains serious harmonic spurious, the BSF can be increased by limiting the wave to achieve the effect of suppressing spurious. The dual channels are divided according to the number of channels of input and output signals. Figure 1 Based on the principle, three or more channels of signal output division can also be adopted.

[0082] In addition, the RF conditioning device is finally assembled in the shielding structure. The shell material is rust-proof aluminum, the shell surface is technically processed, and the interface is located on the shell panel. The top view of the shielding structure including the RF conditioning device is shown in the figure. Figure 3 , front view as Figure 4 , the right side view is as follows Figure 5 (Unit: mm) as shown.

[0083] Specifically, Figure 4 The shielding structure is equipped with two antenna input interfaces, which are connected to the internal RF conditioning device, namely X12G / low-end antenna interface and X13G / high-end antenna interface, and two RF output interfaces, namely X10G / RF output 1 interface and X11G / RF output 2 interface. A certain distance is set between each adjacent interface of the same type to prevent electromagnetic interference between signals while minimizing the space used by the device as much as possible and making the RF conditioning device lightweight.

[0084] like Figure 5 The shielded structure also has an X14 / analog control interface and an X15 / analog power supply interface, which are connected to the internal RF conditioning device to support extended functions.

[0085] The benefits of adopting the above solution are as follows:

[0086] The RF conditioning device has high frequency accuracy and high stability. The modules are all located in the shielding structure, and the interface is located on the outer shell panel. It has excellent impact and vibration resistance, and has excellent moisture resistance, salt spray resistance, and mildew resistance, which can meet the environmental use requirements under different platforms. The miniaturized design of the RF conditioning device effectively improves the working efficiency of RF conditioning, reduces heat consumption, reduces the heat dissipation volume, and reduces the weight and size of the RF conditioning device. Compared with existing equipment, the weight of the whole machine is reduced to less than 1kg while having better or the same performance, which is greatly reduced compared to common equipment.

[0087] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0088] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A dual-channel radio frequency conditioning device, characterized in that: include: A band switch, a first digitally controlled attenuator, a second digitally controlled attenuator, a preselection filter group, and a power divider; One end of the band switch is connected to the first input port and the second input port respectively, the other end of the band switch is connected to one end of the first digitally controlled attenuator, the other end of the first digitally controlled attenuator is connected to one end of the preselection filter group, the other end of the preselection filter group is connected to one end of the second digitally controlled attenuator, the other end of the second digitally controlled attenuator is connected to one end of the power divider, and the other end of the power divider is respectively connected to the first output port and the second output port.

2. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: A first limiter; One end of the first limiter is connected to the first input port, and the other end of the first limiter is connected to one end of the band switch.

3. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: a second limiter; One end of the second limiter is connected to the second input port, and the other end of the second limiter is connected to one end of the band switch.

4. A dual-channel radio frequency conditioning device according to claim 2, characterized in that: Also includes: Wave limiter; One end of the wave limiter is connected to one end of the first amplitude limiter, and the other end of the wave limiter is connected to one end of the band switch.

5. A dual-channel radio frequency conditioning device according to claim 4, characterized in that: Also includes: The first low noise amplifier; One end of the first low noise amplifier is connected to one end of the wave limiter, and the other end of the first low noise amplifier is connected to one end of the band switch.

6. A dual-channel radio frequency conditioning device according to claim 3, characterized in that: Also includes: a second low noise amplifier; One end of the second low noise amplifier is connected to one end of the second limiter, and the other end of the second low noise amplifier is connected to one end of the band switch.

7. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: A third low noise amplifier; One end of the third low noise amplifier is connected to the other end of the second digitally controlled attenuator, and the other end of the third low noise amplifier is connected to one end of the power divider.

8. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: a fourth low noise amplifier; One end of the fourth low noise amplifier is connected to the other end of the power divider, and the other end of the fourth low noise amplifier is connected to the first output port.

9. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: fifth low noise amplifier; One end of the fifth low noise amplifier is connected to the other end of the power divider, and the other end of the fifth low noise amplifier is connected to the second output port.

10. A dual-channel radio frequency conditioning device according to claim 1, characterized in that: Also includes: Relay; One end of the relay is connected to the first input port.

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