Communication transceiver under Ka wave band

Abstract

The invention discloses a communication transceiving device under a Ka wave band, which relates to the technical field of radio frequency communication and comprises a radio frequency signal receiving unit, a frequency mixing signal numerical control gain unit, a local oscillation signal generating unit, a radio frequency mixing unit and a radio frequency signal transmitting unit, the radio frequency signal receiving unit, the frequency mixing signal numerical control gain unit, the local oscillator signal generating unit, the radio frequency mixing unit and the radio frequency signal transmitting unit are connected in sequence. According to the invention, Ka-band signal receiving and signal transmitting can be realized, so that the size of equipment is smaller than that of a traditional communication transmitting and receiving assembly, the weight is lighter, and the electromagnetic compatibility is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency communication technology, and in particular to a communication transceiver device in the Ka band. Background Art

[0002] Communication receiver and transmitter components are an important part of the communication process and are widely used in microwave communications, radar, remote control and many microwave electronic devices. As the main part of the communication system, the subsystem plays a vital role in the entire system. The performance of the communication component will directly affect whether the goal of the entire system is achieved. This requires that the receiver and transmitter should strive to achieve smaller size, lighter weight, lower power consumption, solid-state and integrated transceiver components while completing powerful and complex general functions, and strive to achieve large dynamic range and high sensitivity in terms of electrical performance improvement.

[0003] Traditional Ka-band communication components mostly use technologically mature waveguide stereo circuits, which results in a bulky front-end subsystem with many interfaces, and the polarization direction of the stereo hardware is not necessarily exactly the same.

[0004] In order to connect these individual components, straight and curved waveguide sections must be introduced, which will undoubtedly further increase the space occupied by the system and make the equipment more bulky. What is more serious is that too many interfaces will bring more leakage, causing interference between components and making it difficult to solve the electromagnetic compatibility of high-frequency systems. 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 to address the problems of large device size and excessive interfaces causing electromagnetic compatibility interference, and specifically to provide a communication transceiver device in the Ka band, as follows:

[0006] 1) In a first aspect, the present invention provides a communication transceiver device in the Ka band, and the specific technical scheme is as follows: comprising: a radio frequency signal receiving unit, a mixing signal digital control gain unit, a local oscillator signal generating unit, a radio frequency mixing unit and a radio frequency signal transmitting unit;

[0007] One end of the RF signal receiving unit is respectively connected to the first signal input port and the second signal input port, the other end of the RF signal receiving unit is connected to one end of the mixing signal digital control gain unit, the other end of the mixing signal digital control gain unit is respectively connected to the intermediate frequency output port and one end of the local oscillator signal generating unit, the other end of the local oscillator signal generating unit is connected to one end of the RF mixing unit, one end of the RF mixing unit is also connected to the intermediate frequency input port, the other end of the RF mixing unit is connected to one end of the RF signal transmitting unit, and the other end of the RF signal transmitting unit is respectively connected to the first signal output port and the second signal output port.

[0008] The beneficial effects of a communication transceiver device in the Ka band provided by the present invention are as follows:

[0009] Each unit in the transceiver uses a multifunctional chip, which is connected in sequence in a full-chip integrated manner to realize Ka-band signal reception and signal transmission. This makes the device smaller and lighter than traditional communication transceiver components. Large-area integration reduces interference between components and enhances electromagnetic compatibility.

[0010] Based on the above solution, the present invention can also be improved as follows.

[0011] Further, the radio frequency signal receiving unit includes: a combiner, a first low noise amplifier, a second low noise amplifier and a first band pass filter;

[0012] One end of the combiner is connected to the first signal input port and the second signal input port respectively, the other end of the combiner is connected to one end of the first low noise amplifier, the other end of the first low noise amplifier is connected to one end of the first band pass filter, the other end of the first band pass filter is connected to one end of the second low noise amplifier, and one end of the second low noise amplifier is connected to one end of the mixing signal digital control gain unit.

[0013] Further, the mixing signal digitally controlled gain unit includes: a first mixer, a digitally controlled attenuation, a second bandpass filter, a third bandpass filter, a fourth bandpass filter, a first digitally controlled amplifier, a second digitally controlled amplifier, a coupler, a fixed attenuator and a detector;

[0014] One end of the first mixer is connected to one end of the RF signal receiving unit, the other end of the first mixer is connected to one end of the digitally controlled attenuator, the other end of the digitally controlled attenuator is connected to one end of the second bandpass filter, the other end of the second bandpass filter is connected to one end of the first digitally controlled amplifier, the other end of the first digitally controlled amplifier is connected to one end of the third bandpass filter, the other end of the third bandpass filter is connected to one end of the second digitally controlled amplifier, the other end of the second digitally controlled amplifier is connected to one end of the coupler, the other end of the coupler is connected to one end of the fixed attenuator, the other end of the fixed attenuator is connected to one end of the fourth bandpass filter, the other end of the fourth bandpass filter is connected to one end of the detector, and the other end of the detector is connected to one end of the digital control unit; one end of the first mixer is also connected to one end of the local oscillator signal generating unit.

[0015] Further, it also includes: a switch filter unit;

[0016] The other end of the numerical control unit is connected to the switch filter unit.

[0017] Furthermore, one end of the coupler is also connected to the intermediate frequency output port.

[0018] Further, the radio frequency mixing unit includes: a second mixer and a fifth bandpass filter;

[0019] One end of the second mixer is connected to the other end of the local oscillator signal generating unit, the other end of the second mixer is connected to one end of the fifth bandpass filter, and the other end of the fifth bandpass filter is connected to one end of the radio frequency signal transmitting unit.

[0020] Furthermore, one end of the second mixer is also connected to the intermediate frequency input port.

[0021] Further, the local oscillator signal generating unit includes: a temperature compensated crystal oscillator, a first power divider, a first local oscillator phase-locked source, and a second local oscillator phase-locked source;

[0022] One end of the temperature compensated crystal oscillator is connected to the other end of the mixing signal digital control gain unit, the other end of the temperature compensated crystal oscillator is connected to one end of the first power divider, the other end of the first power divider is respectively connected to one end of the first local oscillator phase-locked source and one end of the second local oscillator phase-locked source, the other end of the first local oscillator phase-locked source is connected to the mixing signal digital control gain unit through the first mixer, and the other end of the second local oscillator phase-locked source is connected to the RF mixing unit through the second mixer.

[0023] Further, the radio frequency signal transmitting unit includes: a third low noise amplifier, a first switch, a second switch, a sixth band pass filter, a seventh band pass filter, a power amplifier and a second power divider;

[0024] One end of the third low noise amplifier is connected to the other end of the RF mixing unit, the other end of the third low noise amplifier is connected to one end of the first switch, the other end of the first switch is respectively connected to one end of the sixth band-pass filter and one end of the seventh band-pass filter, one end of the second switch is respectively connected to the other end of the sixth band-pass filter and the other end of the seventh band-pass filter, the other end of the second switch is connected to one end of the power amplifier, the other end of the power amplifier is connected to one end of the second power divider, and the other end of the second power divider is respectively connected to the first signal output port and the second signal output port.

[0025] Further, it also includes: a power supply;

[0026] The power supply is respectively connected to the radio frequency signal receiving unit, the mixing signal digital control gain unit, the local oscillator signal generating unit, the radio frequency mixing unit and the radio frequency signal transmitting unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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:

[0028] Figure 1 This is a schematic diagram of the architecture of a communication transceiver device in the Ka band according to an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the architecture of a communication transceiver device in the Ka band according to another embodiment of the present invention;

[0030] Figure 3 Schematic diagram of the connection relationship between the detector, the digital control unit and the switch filter unit in another embodiment of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 As shown, a communication transceiver device in the Ka band according to an embodiment of the present invention includes: a radio frequency signal receiving unit 210, a mixing signal digital control gain unit 220, a local oscillator signal generating unit 230, a radio frequency mixing unit 240 and a radio frequency signal transmitting unit 250;

[0033] One end of the RF signal receiving unit 210 is respectively connected to the first signal input port and the second signal input port, the other end of the RF signal receiving unit 210 is connected to one end of the mixing signal digital control gain unit 220, the other end of the mixing signal digital control gain unit 220 is respectively connected to the intermediate frequency output port and one end of the local oscillator signal generating unit 230, the other end of the local oscillator signal generating unit 230 is connected to one end of the RF mixing unit 240, one end of the RF mixing unit 240 is also connected to the intermediate frequency input port, the other end of the RF mixing unit 240 is connected to one end of the RF signal transmitting unit 250, and the other end of the RF signal transmitting unit 250 is respectively connected to the first signal output port and the second signal output port.

[0034] The beneficial effects of a communication transceiver device in the Ka band provided by the present invention are as follows:

[0035] Each unit in the transceiver uses a multifunctional chip, which is connected in sequence in a full-chip integrated manner to realize Ka-band signal reception and signal transmission. This makes the device smaller and lighter than traditional communication transceiver components. Large-area integration reduces interference between components and enhances electromagnetic compatibility.

[0036] Ka-band refers to: a part of the microwave band of the electromagnetic spectrum, and the frequency range of Ka-band is 26.5-40GHz.

[0037] The first signal input port inputs 32±1GHz frequency band signals, and the second signal input port inputs 2440MHz signals; each input and output has a redundant channel to achieve two-way input and output. This setting can ensure that the module has redundant options during actual use, thereby enhancing the adaptability and reliability of the module.

[0038] The signal receiving process is as follows: signals of different frequency bands are respectively input into the RF signal receiving unit 210 from the first signal input port and the second signal input port, enter the mixing signal digital control gain unit 220 after being amplified and filtered by the RF signal receiving unit 210, and output the intermediate frequency signal from the intermediate frequency output port after being amplified and filtered by the mixing signal digital control gain unit 220.

[0039] The signal transmission process is as follows: the intermediate frequency signal is input from the intermediate frequency signal input port to the RF mixing unit 240, the RF signal is output through the RF mixing unit 240, the RF signal is input to the RF signal transmitting unit 250, and after amplification, filtering and power divider, it is output from the first signal output port and the second signal output port respectively.

[0040] In the above process, the role of the local oscillator signal generating unit 230 is to generate a difference frequency signal, i.e., an intermediate frequency signal, by mixing the electromagnetic wave generated by oscillation with the received signal. For example, if the received signal is 900KHZ and the local oscillator frequency is 1365KHZ, the difference frequency signal of 465KHZ or 2265KHZ can be generated after the two frequencies are mixed.

[0041] like Figure 2 In another embodiment of the present invention, the RF signal receiving unit 210 includes: a combiner, a first low noise amplifier, a second low noise amplifier and a first band pass filter; one end of the combiner is connected to the first signal input port and the second signal input port respectively, the other end of the combiner is connected to one end of the first low noise amplifier, the other end of the first low noise amplifier is connected to one end of the first band pass filter, the other end of the first band pass filter is connected to one end of the second low noise amplifier, and one end of the second low noise amplifier is connected to one end of the mixing signal digital control gain unit 220. Wherein:

[0042] The combiner is used to combine the signals input from the first signal input port and the second signal input port and output them. It should be noted that, unless otherwise specified, the signals mentioned later refer to the signals transmitted in the entire device circuit.

[0043] The first low noise amplifier and the second low noise amplifier are used to amplify the signal to avoid attenuation and noise introduction of the signal when passing through the subsequent circuit, thereby ensuring the quality and strength of the signal in the subsequent processing process.

[0044] The first bandpass filter is used to suppress all signals outside a certain frequency band interval, and keep the information within the frequency band substantially unchanged when passing through. The first bandpass filter performs primary filtering on the signal.

[0045] In another embodiment of the present invention, the mixing signal digital control gain unit 220 includes: a first mixer, a digital controlled attenuation, a second band pass filter, a third band pass filter, a fourth band pass filter, a first digital controlled amplifier, a second digital controlled amplifier, a coupler, a fixed attenuator and a detector; one end of the first mixer is connected to one end of the RF signal receiving unit 210, the other end of the first mixer is connected to one end of the digital controlled attenuation, the other end of the digital controlled attenuation is connected to one end of the second band pass filter, the other end of the second band pass filter is connected to one end of the first digital controlled amplifier, the other end of the first digital controlled amplifier is connected to one end of the third band pass filter, the other end of the third band pass filter is connected to one end of the second digital controlled amplifier, the other end of the second digital controlled amplifier is connected to one end of the coupler, the other end of the coupler is connected to one end of the fixed attenuator, the other end of the fixed attenuator is connected to one end of the fourth band pass filter, the other end of the fourth band pass filter is connected to one end of the detector, and the other end of the detector is connected to one end of the digital control unit; one end of the first mixer is also connected to one end of the local oscillator signal generating unit 230. The connection unit is used to expand the dynamic range of signal reception.

[0046] The first mixer is used to make the frequency of the output signal of the mixer equal to the sum, difference or other combination of the frequencies of the two input signals of the mixer. In this embodiment, the first mixer is used to mix the signal output by the second low noise amplifier and the first local oscillator phase-locked source (described later, or refer to Figure 2 ) output signals.

[0047] Digitally controlled attenuation is based on changes in resistance and is used to control the strength or power of a signal.

[0048] The functions of the second bandpass filter, the third bandpass filter and the fourth bandpass filter are similar to those of the first bandpass filter, except that they are located at different positions in the entire device and act on the output signal of the associated device in the adjacent previous step.

[0049] The first digital control amplifier and the second digital control amplifier are used to amplify the signal to achieve gain adjustment of the signal. The difference between the first digital control amplifier and the second digital control amplifier is that the input signal is amplified step by step to avoid noise introduction.

[0050] The coupler is used to split the signal for output, wherein one intermediate frequency signal is output from the intermediate frequency signal output port.

[0051] The attenuator is used to reduce the power of the signal to prevent the test instrument from being interfered by excessive signal.

[0052] The detector input is connected to the output of the fourth bandpass filter in the mixing signal digital control gain unit 220, and the detector output is connected to the single chip microcomputer of the digital control unit; it is used to detect real-time power, control the digital control attenuator according to the detected power, adjust the output power amplitude, and ensure the stability of the output power amplitude.

[0053] like Figure 3 In another embodiment of the present invention, it further comprises: a switch filter unit; the other end of the numerical control unit is connected to the switch filter unit. The numerical control unit is used to implement the switch control function of the switch filter.

[0054] In another embodiment of the present invention, the RF mixing unit 240 includes: a second mixer and a fifth bandpass filter; one end of the second mixer is connected to the other end of the local oscillator signal generating unit 230, the other end of the second mixer is connected to one end of the fifth bandpass filter, the other end of the fifth bandpass filter is connected to one end of the RF signal transmitting unit 250; one end of the second mixer is also connected to the intermediate frequency input port. Wherein:

[0055] The function of the second mixer is similar to that of the first mixer, except that the second mixer mixes the signal with the intermediate frequency signal input from the intermediate frequency input port.

[0056] The function of the fifth band-pass filter is similar to that of the first band-pass filter, except that the fifth band-pass filter processes the signal output by the second mixer.

[0057] In another embodiment of the present invention, the local oscillator signal generating unit 230 includes: a temperature-compensated crystal oscillator, a first power divider, a first local oscillator phase-locked source, and a second local oscillator phase-locked source; one end of the temperature-compensated crystal oscillator is connected to the other end of the mixing signal digital control gain unit 220, the other end of the temperature-compensated crystal oscillator is connected to one end of the first power divider, the other end of the first power divider is respectively connected to one end of the first local oscillator phase-locked source and one end of the second local oscillator phase-locked source, the other end of the first local oscillator phase-locked source is connected to the mixing signal digital control gain unit 220 through the first mixer, and the other end of the second local oscillator phase-locked source is connected to the RF mixing unit 240 through the second mixer. Wherein:

[0058] Temperature compensated crystal oscillator refers to temperature compensated crystal oscillator, including digital compensated crystal oscillator and microcomputer compensated crystal oscillator. The device adopts analog compensation network or digital compensation method inside, and uses the change of crystal load reactance with temperature to compensate the frequency-temperature characteristics of crystal element, so as to reduce its frequency-temperature deviation.

[0059] The function of the first power divider is opposite to that of the combiner, and is used to divide one input signal energy into two or more outputs with equal or unequal energy.

[0060] The first local oscillator phase-locked source and the second local oscillator phase-locked source are used for the local oscillator reference signal of the mixer, and the difference between the two is that the specific output frequencies are different.

[0061] In another embodiment of the present invention, the RF signal transmitting unit 250 includes: a third low noise amplifier, a first switch, a second switch, a sixth band pass filter, a seventh band pass filter, a power amplifier and a second power divider; one end of the third low noise amplifier is connected to the other end of the RF mixing unit 240, the other end of the third low noise amplifier is connected to one end of the first switch, the other end of the first switch is respectively connected to one end of the sixth band pass filter and one end of the seventh band pass filter, one end of the second switch is respectively connected to the other end of the sixth band pass filter and the other end of the seventh band pass filter, the other end of the second switch is connected to one end of the power amplifier, the other end of the power amplifier is connected to one end of the second power divider, and the other end of the second power divider is respectively connected to the first signal output port and the second signal output port. Wherein:

[0062] The third low noise amplifier is used to amplify the signal to avoid signal attenuation and noise introduction when passing through subsequent circuits, thereby ensuring the quality and strength of the signal in subsequent processing.

[0063] The first switch and the second switch are used to realize the switching of the frequency and the corresponding filter. The first switch is located at the signal output end, and the second switch is located at the signal output end.

[0064] The sixth bandpass filter and the seventh bandpass filter are used to suppress all signals outside a certain frequency band interval and keep the information within the frequency band substantially unchanged when passing through.

[0065] Power amplifiers are used to amplify weak electrical signals.

[0066] The function of the second power divider is similar to that of the first power divider, except that after the second power divider divides the signal, the signal is output through the first signal output port and the second signal output port.

[0067] In another embodiment of the present invention, it further includes: a power supply; the power supply is respectively connected to the RF signal receiving unit, the mixing signal digital control gain unit, the local oscillator signal generating unit, the RF mixing unit and the RF signal transmitting unit, and is used to supply power to each unit. Furthermore, the power supply is connected to each unit on the module, such as the amplifier, switch, digital control unit: single chip microcomputer, detector, etc., to ensure that the operating voltage of the chip device in each unit meets the requirements.

[0068] It should be noted that the CNC unit and the power supply are integrated on a PCB board, and the CNC unit is connected to each unit through a single-chip microcomputer to achieve functional control.

[0069] The benefits of adopting the above solution are: on the one hand, the multifunctional chips are connected in sequence in a full chip integration mode to achieve the reception and transmission of Ka-band signals, making the device smaller and lighter than traditional communication transceiver components. The large-area integration reduces the interference between components and enhances electromagnetic compatibility. On the other hand, the digital control gain method is used to widen the receiving dynamic range of the receiver. Two amplifiers and a digital control attenuation are used in the digital control gain to form an AGC circuit, achieving a large dynamic range of 70dBm reception. By using mature chips, the volume and weight are reduced.

[0070] 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.

[0071] 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 Ka-band communication transceiver, characterized in that: include: A radio frequency signal receiving unit, a mixing signal digital control gain unit, a local oscillator signal generating unit, a radio frequency mixing unit and a radio frequency signal transmitting unit; One end of the RF signal receiving unit is respectively connected to the first signal input port and the second signal input port, the other end of the RF signal receiving unit is connected to one end of the mixing signal digital control gain unit, the other end of the mixing signal digital control gain unit is respectively connected to the intermediate frequency output port and one end of the local oscillator signal generating unit, the other end of the local oscillator signal generating unit is connected to one end of the RF mixing unit, one end of the RF mixing unit is also connected to the intermediate frequency input port, the other end of the RF mixing unit is connected to one end of the RF signal transmitting unit, and the other end of the RF signal transmitting unit is respectively connected to the first signal output port and the second signal output port.

2. A Ka-band communication transceiver according to claim 1, characterized in that: The radio frequency signal receiving unit comprises: a combiner, a first low noise amplifier, a second low noise amplifier and a first band pass filter; One end of the combiner is connected to the first signal input port and the second signal input port respectively, the other end of the combiner is connected to one end of the first low noise amplifier, the other end of the first low noise amplifier is connected to one end of the first band pass filter, the other end of the first band pass filter is connected to one end of the second low noise amplifier, and one end of the second low noise amplifier is connected to one end of the mixing signal digital control gain unit.

3. A Ka-band communication transceiver according to claim 1, characterized in that: The mixing signal digitally controlled gain unit comprises: a first mixer, a digitally controlled attenuator, a second bandpass filter, a third bandpass filter, a fourth bandpass filter, a first digitally controlled amplifier, a second digitally controlled amplifier, a coupler, a fixed attenuator and a detector; One end of the first mixer is connected to one end of the RF signal receiving unit, the other end of the first mixer is connected to one end of the digitally controlled attenuator, the other end of the digitally controlled attenuator is connected to one end of the second bandpass filter, the other end of the second bandpass filter is connected to one end of the first digitally controlled amplifier, the other end of the first digitally controlled amplifier is connected to one end of the third bandpass filter, the other end of the third bandpass filter is connected to one end of the second digitally controlled amplifier, the other end of the second digitally controlled amplifier is connected to one end of the coupler, the other end of the coupler is connected to one end of the fixed attenuator, the other end of the fixed attenuator is connected to one end of the fourth bandpass filter, the other end of the fourth bandpass filter is connected to one end of the detector, and the other end of the detector is connected to one end of the digital control unit; one end of the first mixer is also connected to one end of the local oscillator signal generating unit.

4. A Ka-band communication transceiver according to claim 3, characterized in that: Also includes: Switch filter unit; The other end of the numerical control unit is connected to the switch filter unit.

5. The Ka-band communication transceiver according to claim 3, characterized in that: One end of the coupler is also connected to the intermediate frequency output port.

6. The Ka-band communication transceiver according to claim 3, characterized in that: The radio frequency mixing unit comprises: a second mixer and a fifth bandpass filter; One end of the second mixer is connected to the other end of the local oscillator signal generating unit, the other end of the second mixer is connected to one end of the fifth bandpass filter, and the other end of the fifth bandpass filter is connected to one end of the radio frequency signal transmitting unit.

7. A Ka-band communication transceiver according to claim 6, characterized in that: One end of the second mixer is also connected to the intermediate frequency input port.

8. The Ka-band communication transceiver according to claim 6, characterized in that: The local oscillator signal generating unit comprises: a temperature compensated crystal oscillator, a first power divider, a first local oscillator phase-locked source and a second local oscillator phase-locked source; One end of the temperature compensated crystal oscillator is connected to one end of the first power divider, the other end of the first power divider is respectively connected to one end of the first local oscillator phase-locked source and one end of the second local oscillator phase-locked source, the other end of the first local oscillator phase-locked source is connected to the mixing signal digital control gain unit through the first mixer, and the other end of the second local oscillator phase-locked source is connected to the RF mixing unit through the second mixer.

9. The Ka-band communication transceiver according to claim 1, characterized in that: The radio frequency signal transmitting unit includes: a third low noise amplifier, a first switch, a second switch, a sixth band pass filter, a seventh band pass filter, a power amplifier and a second power divider; One end of the third low noise amplifier is connected to the other end of the RF mixing unit, the other end of the third low noise amplifier is connected to one end of the first switch, the other end of the first switch is respectively connected to one end of the sixth band-pass filter and one end of the seventh band-pass filter, one end of the second switch is respectively connected to the other end of the sixth band-pass filter and the other end of the seventh band-pass filter, the other end of the second switch is connected to one end of the power amplifier, the other end of the power amplifier is connected to one end of the second power divider, and the other end of the second power divider is respectively connected to the first signal output port and the second signal output port.

10. The Ka-band communication transceiver according to claim 1, characterized in that: Also includes: power supply; The power supply is respectively connected to the radio frequency signal receiving unit, the mixing signal digital control gain unit, the local oscillator signal generating unit, the radio frequency mixing unit and the radio frequency signal transmitting unit.

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