Close-range coupling differential antenna of CT (Computed Tomography) machine and corresponding signal coupling device

Abstract

The utility model discloses a CT (Computed Tomography) machine close-range coupling differential antenna and a corresponding signal coupling device. The antenna comprises a transmitting antenna unit which is provided with a reference ground layer copper foil, a transmitting unit connector, a far-end matching resistor, a dielectric substrate, a left oscillator antenna and a right oscillator antenna, wherein the reference ground layer copper foil, the transmitting unit connector, the far-end matching resistor, the dielectric substrate, the left oscillator antenna and the right oscillator antenna are arranged on the transmitting antenna unit; wherein the reference ground layer copper foil is flatly laid on the back surface of the transmitting antenna unit; the transmitting unit connector and the far-end matching resistor are arranged on the reference stratum copper foil; the dielectric substrate, the left-side oscillator antenna and the right-side oscillator antenna are all arranged on the front surface of the transmitting antenna unit, the left-side oscillator antenna and the right-side oscillator antenna are arranged in parallel, a preset distance is formed between the left-side oscillator antenna and the right-side oscillator antenna, and meanwhile, the left-side oscillator antenna and the right-side oscillator antenna have the same preset width and are both higher than the dielectric substrate by a preset height. In the technical scheme of the utility model, the antenna can be bent into a ring shape or flatly laid on a track and installed on the outer side of the rotor, and the transmission rate is up to 10Gbps, thereby solving the problems of installation and high-speed data transmission.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment, wireless communication, photoelectric communication field capacitive coupling transmission of radio frequency signal, high speed digital signal especially, a kind of CT machine close coupling differential antenna and corresponding signal coupling device. BACKGROUND

[0002] The existing PCB microstrip transmission antenna is mostly used for Bluetooth, WIFI signal transmission, and its actual transmission rate is between tens to hundreds of Mbps, which is low in transmission rate.The existing technology uses brush contact mode to transmit signals, and its highest transmission rate is within gigabit;And higher rate data communication must use optical fiber slip ring to transmit, but the optical fiber slip ring must be installed at the center of stator and rotor to be used, that is, the existing antenna cannot be installed in hollow and rotating device (such as slip ring) at the same time, and high-speed transmission of large amount of data can be achieved. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, a CT machine close coupling differential antenna and corresponding signal coupling device are provided, the antenna can be bent into a ring or laid on the track, installed on the outside of the rotor, and the transmission rate is as high as 10Gbps, which solves the problems of installation and high-speed data transmission.

[0004] A CT machine close coupling differential antenna, comprising a long strip-shaped transmitting antenna unit, a reference ground copper foil, a transmitting unit connector, a far-end matching resistor, a dielectric substrate, a first left-side dipole antenna and a first right-side dipole antenna are arranged on the transmitting antenna unit, wherein,

[0005] The reference ground copper foil is laid on the back of the transmitting antenna unit; the transmitting unit connector is arranged on the reference ground copper foil and located at the middle position of the length direction of the transmitting antenna unit; the far-end matching resistor is arranged on the reference ground copper foil and located at the end away from the transmitting unit connector;

[0006] The dielectric substrate is laid on the front of the transmitting antenna unit, the first left-side dipole antenna and the first right-side dipole antenna are arranged on the dielectric substrate and arranged parallel to each other along the length direction of the transmitting antenna unit; the first left-side dipole antenna and the first right-side dipole antenna are separated by a predetermined distance, and both have the same predetermined width and are higher than the dielectric substrate by a predetermined height.

[0007] A signal coupling device is characterized in that the signal coupling device is applied to a CT machine and comprises a light receiving module, a radio frequency transmitting module, a transmitting antenna unit, a receiving antenna unit, a radio frequency receiving module and a light transmitting module; wherein the transmitting antenna unit is arranged at the rotor end of a slip ring; the receiving antenna unit is arranged at the stator end of the slip ring;

[0008] The light receiving module is used for receiving input light signals.

[0009] The radio frequency transmitting module is used for forwarding the light signals processed to the transmitting antenna unit.

[0010] The transmitting antenna unit is used for sending signals to the receiving antenna unit through near distance space coupling.

[0011] The receiving antenna unit is used for sending signals acquired from the transmitting antenna unit to the radio frequency receiving module.

[0012] The radio frequency receiving module is used for sending signals acquired from the receiving antenna unit to the light transmitting module after processing.

[0013] The light transmitting module is used for converting signals acquired from the radio frequency receiving module into light signals and outputting.

[0014] The CT machine near distance coupling differential antenna and the corresponding signal coupling device can be typically applied to the CT machine; the transmitting antenna unit can be installed at the outer side of the rotor of the slip ring, the transmitting antenna unit is bent into a ring shape or laid on a preset track, the CML high speed signals which cannot be wirelessly transmitted are capacitively coupled, and the installation problem is solved; meanwhile, the near distance non-contact electric field coupling is adopted to perform high speed data transmission, the highest transmission rate can reach 10 Gbps, and the error code rate is less than or equal to 10E-12, and the high speed data transmission problem is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the CT machine near distance coupling differential antenna in the embodiment of the utility model;

[0016] Figure 2 It is another perspective view of the CT machine near distance coupling differential antenna in the embodiment of the utility model;

[0017] Figure 3 It is a side view of the CT machine near distance coupling differential antenna in the embodiment of the utility model;

[0018] Figure 4 It is a working schematic view of the CT machine near distance coupling differential antenna in the embodiment of the utility model;

[0019] Figure 5This is a schematic diagram of the installation of the CT scanner near-field coupling differential antenna in the signal coupling device of this utility model embodiment;

[0020] Figure 6 This is a module framework diagram of the signal coupling device in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the operation of the signal coupling device in an embodiment of this utility model;

[0022] The markings in the accompanying drawings are as follows:

[0023] 10. Optical receiver module; 20. Radio frequency transmitter module; 30. Transmit antenna unit; 40. Receive antenna unit; 50. Radio frequency receiver module; 60. Optical transmitter module;

[0024] 201. First data recovery unit; 202. Fan-out driver; 203. First control unit;

[0025] 301. Reference layer copper foil; 302. Transmitter unit connector; 303. Remote matching resistor;

[0026] 304. Dielectric substrate; 305. Left dipole antenna; 306. Right dipole antenna; 307. First metal via; 308. Second metal via;

[0027] 501. Comparator; 502. Limiting amplifier; 503. Second data recovery unit; 504. Second control unit. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] Provides a close-range coupled differential antenna for a CT scanner, such as... Figures 1 to 4 As shown, it includes a long strip-shaped transmitting antenna unit 30, on which a reference ground copper foil 301, a transmitting unit connector 302, a remote matching resistor 303, a dielectric substrate 304, a first left-side dipole antenna 305, and a first right-side dipole antenna 306 are disposed; wherein,

[0030] A reference ground copper foil is laid flat on the back of the transmitting antenna element; the transmitting element connector is placed on the reference ground copper foil and located in the middle of the transmitting antenna element along its length; the far-end matching resistor is placed on the reference ground copper foil and located at the end furthest from the transmitting element connector.

[0031] The dielectric substrate is laid flat on the front of the transmitting antenna unit. The first left-side vibrating antenna and the first right-side vibrating antenna are disposed on the dielectric substrate and are arranged parallel to each other along the length direction of the transmitting antenna unit. The first left-side vibrating antenna and the first right-side vibrating antenna are separated by a preset distance, and both have the same preset width and are higher than the preset height of the dielectric substrate.

[0032] like Figure 3 As shown, H1 is the dielectric layer height, Er1 is the dielectric constant of the dielectric layer, S1 is the microstrip copper foil follower spacing (i.e., the spacing between the first left-side dipole antenna and the first right-side dipole antenna), W1 is the lower layer trace width, W2 is the upper layer trace width, and T1 is the thickness of the first left-side dipole antenna and the first right-side dipole antenna.

[0033] The dielectric substrate material selected is F4BM217, with a dielectric constant of 2.17, a thickness of 1.0 mm, and a loss factor of 0.001. The first left-side dipole antenna, the first right-side dipole antenna, and the reference ground are made of ED copper foil. The linewidth and spacing of the first left-side dipole antenna and the first right-side dipole antenna can be calculated based on simulation. The microstrip antenna is 50Ω single-ended (100Ω differential) with a length of 2200 mm. Simultaneously, a 100Ω matching resistor is placed at the far-end of the antenna to maintain differential signal integrity and reduce signal attenuation and distortion during transmission.

[0034] Specifically, based on simulation software and known PCB and antenna material parameters, the antenna insertion loss is calculated. Assuming the antenna conductor insertion loss is -1.1 dB / m within the 10 MHz to 10 GHz frequency range, and the return loss is >29 dB, the design requirements are met. In use, the transmitting unit connector transmits differential signals to the differential antenna element pairs (i.e., the first left-side and first right-side antenna elements), and transmits them in two directions respectively.

[0035] The copper transmission microstrip lines of the transmitting antenna unit can be processed with high precision by etching, which makes the dielectric material stable and is conducive to the long-distance transmission of high-speed signals.

[0036] Furthermore, the transmitting antenna unit has a first metal via 307 and a second metal via 308. Both the first metal via and the second metal via penetrate the dielectric substrate and the reference ground copper foil, and are used to install the transmitting unit connector and the remote matching resistor, respectively.

[0037] Furthermore, it also includes a receiving antenna unit 40 corresponding to the transmitting antenna unit. The receiving antenna unit includes a second left-side dipole antenna and a second right-side dipole antenna, respectively corresponding to the first left-side dipole antenna and the first right-side dipole antenna. When the transmitting antenna unit and the receiving antenna unit are used together, the signal coupling is as follows: Figure 4As shown. Preferably, the spatial coupling distance between the transmitting antenna element and the receiving antenna element is 1.3 ± 0.7 mm.

[0038] Provide a signal coupling device, such as Figures 5 to 7 As shown, the signal coupling device is used on a CT scanner and includes an optical receiving module 10, an RF transmitting module 20, a transmitting antenna unit 30, a receiving antenna unit 40, an RF receiving module 50, and an optical transmitting module 60. The transmitting antenna unit corresponds to the transmitting antenna unit in the aforementioned CT scanner's close-range coupling differential antenna and is located at the rotor end of the slip ring. The receiving antenna unit corresponds to the receiving antenna unit in the aforementioned CT scanner's close-range coupling differential antenna and is located at the stator end of the slip ring.

[0039] Specifically, an embodiment is provided in which a CML high-speed differential signal with a transmission rate of 1Gbps to 10Gbps is coupled to an antenna for transmission, and its transmission frequency is in the range of (10MHz to 10GHz). The modules and signal transmission process are as follows:

[0040] The optical receiving module 10 is used to receive the laser signal from the external optical input and convert the laser signal into a digital high-speed electrical signal.

[0041] The radio frequency (RF) transmitting module 20 processes and forwards optical signals to the transmitting antenna unit. The first data recovery unit 201 detects the electrical signal sent by the optical receiving module and feeds it back to the first control unit 203. The first control unit controls the first data recovery unit to perform data quantization and data restoration / shaping on the electrical signal, automatically locking it to all data rates. The fan-out driver 202 receives the restored / shaped electrical signal and divides it into two sets of differential signals to drive the transmission to the transmitting antenna unit 30 at the transmitter rotor end.

[0042] The transmitting antenna unit 30 at the rotor end couples the signal transmitted from the fan-out driver to the receiving antenna unit 40 at the rotor end through close-range spatial coupling.

[0043] The receiving antenna unit 40 is used to transmit the signal obtained from the transmitting antenna unit to the radio frequency receiving module 50.

[0044] The radio frequency receiving module 50 processes the signal acquired from the receiving antenna unit and then transmits it to the optical transmitting module. The comparator 501 compares the electrical signal received by the stator-end receiving antenna unit and sends it to the limiting amplifier 502 for signal amplification. The second data recovery unit 503 detects the electrical signal sent from the limiting amplifier and feeds it back to the second control unit 504. The second control unit controls the second data recovery unit 503 to perform data recovery and shaping on the amplified electrical signal, automatically locking it to all data rates before sending it to the optical transmitting module 60.

[0045] The optical transmitting module 60 is used to convert the signal obtained from the radio frequency receiving module into an optical signal output, that is, to convert the restored and shaped signal into an optical signal output.

[0046] The above is a description of the near-field coupling differential antenna for CT scanner and the corresponding signal coupling device of this utility model, which is used to help understand this utility model; however, the implementation of this utility model is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the principle of this utility model shall be considered as equivalent substitutions and shall be included within the protection scope of this utility model.

Claims

1. A close-range coupled differential antenna for a CT scanner, characterized in that, It includes a long, strip-shaped transmitting antenna unit, on which a reference ground copper foil, a transmitting unit connector, a far-end matching resistor, a dielectric substrate, a first left-side dipole antenna, and a first right-side dipole antenna are disposed; wherein, The reference ground copper foil is laid flat on the back of the transmitting antenna unit; the transmitting unit connector is disposed on the reference ground copper foil and located at the middle position in the length direction of the transmitting antenna unit; the far-end matching resistor is disposed on the reference ground copper foil and located at the end away from the transmitting unit connector. The dielectric substrate is laid flat on the front of the transmitting antenna unit. The first left-side vibrating antenna and the first right-side vibrating antenna are disposed on the dielectric substrate and are arranged parallel to each other along the length direction of the transmitting antenna unit. The first left-side vibrating antenna and the first right-side vibrating antenna are separated by a preset distance, and both have the same preset width and are higher than the preset height of the dielectric substrate.

2. The CT scanner close-range coupled differential antenna as described in claim 1, characterized in that, The transmitting antenna unit has a first metal via, which penetrates the dielectric substrate and the reference ground copper foil, and is used to mount the transmitting unit connector.

3. The CT scanner close-range coupled differential antenna as described in claim 1, characterized in that, The transmitting antenna unit has a second metal via, which penetrates the dielectric substrate and the reference ground copper foil, and is used to mount the remote matching resistor.

4. The CT scanner close-range coupled differential antenna as described in claim 1, characterized in that, The dielectric substrate has a dielectric constant of 2.17, a thickness of 1 mm, and a loss factor of 0.

001.

5. The CT scanner close-range coupled differential antenna as described in claim 1, characterized in that, The first left-side dipole antenna and the first right-side dipole antenna are made of copper foil wire with a length of 2200mm and a single-ended impedance of 50 ohms; the far-end matching resistor is 100 ohms.

6. The CT scanner close-range coupled differential antenna as described in any one of claims 1 to 5, characterized in that, It also includes a receiving antenna unit, which includes a second left-side vibrating antenna and a second right-side vibrating antenna that correspond to the first left-side vibrating antenna and the first right-side vibrating antenna, respectively. The second left-side vibrating antenna and the second right-side vibrating antenna are arranged parallel to each other and separated by the preset distance. The width and height of the second left-side vibrating antenna and the second right-side vibrating antenna are the same as those of the first left-side vibrating antenna and the first right-side vibrating antenna, respectively.

7. The CT scanner close-range coupled differential antenna as described in claim 6, characterized in that, The spatial coupling distance between the transmitting antenna unit and the receiving antenna unit is 1.3 ± 0.7 mm.

8. A signal coupling device, characterized in that, The signal coupling device is used on a CT scanner and includes an optical receiving module, a radio frequency transmitting module, a transmitting antenna unit, a receiving antenna unit, and an optical transmitting module; wherein, the transmitting antenna unit is disposed at the rotor end of the slip ring and corresponds to the transmitting antenna unit in the CT scanner near-field coupling differential antenna according to any one of claims 1 to 5; the receiving antenna unit is disposed at the stator end of the slip ring and corresponds to the receiving antenna unit in the CT scanner near-field coupling differential antenna according to any one of claims 6 to 7. The optical receiving module is used to receive input optical signals; The radio frequency transmitting module is used to process the optical signal and forward it to the transmitting antenna unit; The transmitting antenna unit is used to transmit signals to the receiving antenna unit through close-range spatial coupling; The receiving antenna unit is used to transmit the signal obtained from the transmitting antenna unit to the radio frequency receiving module; The radio frequency receiving module is used to process the signal obtained from the receiving antenna unit and then send it to the optical transmitting module; The optical transmitting module is used to convert the signal acquired from the radio frequency receiving module into an optical signal for output.

9. The signal coupling device as described in claim 8, characterized in that, The radio frequency transmission module includes a first data recovery unit, a fan-out driver electrically connected to the first data recovery unit, and a first control unit.

10. The signal coupling device as described in claim 8, characterized in that, The radio frequency receiving module includes a second data recovery unit, a second control unit electrically connected to the second data recovery unit, a limiting amplifier, and a comparator electrically connected to the limiting amplifier.

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