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CN-122026934-A - 210-220GHz radio frequency receiving module

CN122026934ACN 122026934 ACN122026934 ACN 122026934ACN-122026934-A

Abstract

The invention relates to the field of wireless communication and discloses a 210-220GHz radio frequency receiving module which comprises a case 1 and a receiving circuit system, wherein the case 1 comprises a local oscillator interface 2, an intermediate frequency interface 3, a radio frequency interface 4 and a power supply interface 5, and the receiving circuit system is integrated in the case 1 and comprises a local oscillator generating unit 11, a mixing unit 12 and a receiving unit 13 which are mutually cascaded, and the beneficial effects are that the typical value of the noise coefficient of the system is about 6.8dB, the spurious suppression is greater than 40dBc and the total power consumption is less than 5W.

Inventors

  • LU HAO
  • TAN ZHIZHONG
  • LV XINWEI

Assignees

  • 苏州泰莱微波技术有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (9)

  1. 1. A210-220 GHz radio frequency receiving module is characterized by comprising a case (1) and a receiving circuit system; The chassis (1) comprises: The local oscillation interface (2) is arranged inside the case (1) and is used for introducing external reference or monitoring the internal clock state; the intermediate frequency interface (3) is arranged inside the case (1) and is used for outputting intermediate frequency signals; The radio frequency interface (4) is arranged inside the case (1) and is used for receiving radio frequency signals; The power supply interface (5) is arranged on the outer wall of the chassis (1) and is used for supplying power to the whole circuit operation; The receiving circuit system integrated inside the case (1) comprises a local oscillator generating unit (11), a mixing unit (12) and a receiving unit (13) which are mutually cascaded; The local oscillation generating unit (11) is connected with the local oscillation interface (2) and is used for providing local oscillation signals; the intermediate frequency output end of the mixing unit (12) is connected to the intermediate frequency interface (3) and is used for carrying out mixing operation by utilizing the local oscillation signal and the signal input by the receiving unit (13) and outputting an intermediate frequency signal; The receiving unit (13) is connected to the radio frequency input of the mixing unit (12), and the input of the receiving unit (13) is connected to the radio frequency interface (4).
  2. 2. A 210-220GHz radio frequency receiving module as claimed in claim 1, wherein the local oscillator generating unit (11) comprises: The phase-locked crystal oscillator is used for outputting a reference signal with the frequency of 100 MHz; The point frequency source is connected with the phase-locked crystal oscillator and is used for locking the reference signal by utilizing an internal phase-locked loop circuit and outputting a point frequency signal with the frequency of 13.125 GHz; And the frequency multiplier is connected with the point frequency source and is used for performing eight-time frequency processing on the point frequency signal of 13.125GHz and outputting the local oscillation signal with the frequency of 105GHz to the frequency mixing unit (12).
  3. 3. The 210-220GHz radio frequency receiving module as in claim 1, wherein, The frequency mixing unit (12) adopts an I/Q second harmonic frequency mixer architecture and outputs 6-16 GHz intermediate frequency signals; the receiving unit (13) comprises an antenna, a low noise amplifier, The intermediate frequency interface (3) adopts an SMA female connector; The radio frequency interface (4) is configured as a waveguide flange of WR4.3-UG387/M specification.
  4. 4. The 210-220GHz radio frequency receiving module of claim 1, wherein a heat dissipation assembly is arranged inside the chassis (1); The heat dissipation assembly comprises heat conduction glue, metal heat dissipation teeth and a case heat dissipation fan (6) arranged at the rear panel position of the case (1); the metal radiating teeth are adhered to the surfaces of the frequency multiplier and the receiving unit (13) through the heat conducting adhesive, and heat is conducted to the bottom plate of the chassis (1) through screw fixing holes; the chassis cooling fan (6) is matched with cooling holes formed in the side wall of the chassis (1) to form an air convection channel.
  5. 5. A 210-220GHz radio frequency receiving module according to claim 3, wherein the low noise amplifier of the receiving unit (13) is connected to the mixing unit (12), and the low noise amplifier is preferably selected to ensure that the noise factor of the frequency band of 210-220GHz is less than or equal to 6.8 dB, so as to control cascading noise.
  6. 6. The 210-220GHz rf receiving module of claim 2, wherein an attenuator is disposed in front of the frequency multiplier to provide a high stability local oscillator drive signal.
  7. 7. A 210-220GHz radio frequency receiving module as claimed in claim 3, wherein a receiving unit filter is added to the antenna and the low noise amplifier, the filter initially suppressing out-of-band interference.
  8. 8. A210-220 GHz radio frequency receiving module as in claim 3, wherein, The radio frequency interface 4 of the WR4.3-UG387/M standard waveguide interface is connected with an antenna, the working frequency band of the antenna is covered by 170 GHz, 210-220 GHz target signals can be effectively captured, the target signals firstly enter the low-noise amplifier, the amplified signals are input into a down converter of the frequency mixing unit (12), the low-noise amplifier provides gain of 38-40 dB, the noise is restrained, meanwhile, the linear amplification of the signals is ensured, and sufficient power margin is provided for subsequent frequency mixing processing.
  9. 9. A 210-220GHz radio frequency receiving module as claimed in claim 2, wherein the mixing unit (12) employs an I/Q second harmonic mixer as a core device, the I/Q second harmonic mixer employing a quadrature demodulation architecture, and implementing quadrature down-conversion of radio frequency signals to an Intermediate Frequency (IF) through a 90 ° phase shift network.

Description

210-220GHz radio frequency receiving module Technical Field The invention relates to the technical field of wireless communication, in particular to a 210-220GHz radio frequency receiving module. Background The radio frequency receiving module is electronic equipment for wireless communication, is used for receiving radio frequency signals of a specific frequency band, demodulates the radio frequency signals into baseband signals for subsequent circuit processing, is mainly applied to wireless communication systems, remote control and Internet of things, radar and navigation, consumer electronics and the like, and is positioned at the juncture of millimeter waves and terahertz waves in the frequency band of 210-220GHz, and becomes an important working frequency band of the next-generation ultra-high-speed wireless communication and high-resolution imaging radar system due to extremely wide available frequency spectrum resources and good atmospheric transmission characteristics. The traditional radio frequency receiving module generally adopts a mixer as a core frequency conversion component, but is limited by the physical characteristics of devices, and in a low noise amplification link, a Low Noise Amplifier (LNA) with a frequency range of 210-220GHz has a remarkable gain fluctuation problem, and typical gain flatness deviation exceeds +/-3 dB, so that the receiving is directly influenced Signal fidelity of the link. The harmonic suppression performance of the local oscillator link also becomes a technical bottleneck. In the existing scheme, the second harmonic rejection ratio of the local oscillation signal is generally lower than 35dBc, and the third harmonic rejection ratio is lower than 30dBc, so that spurious signals are introduced into a receiving link through a mixing process, and the signal to noise ratio is seriously deteriorated. In addition, the heat dissipation problem caused by high-density integration is not ignored, the power dissipation density of the 210-220GHz frequency band device can reach 1.5W/mm < 2>, and the traditional heat dissipation design is easy to cause the working temperature of the module to exceed 85 ℃, so that the noise factor is deteriorated and the long-term reliability is reduced. The comparison of performance parameters shows that the noise coefficient of the current commercial 210-220GHz receiving module is generally larger than 10dB, and the requirements of scenes such as military communication, high-precision radars and the like on the receiving sensitivity generally need to reach the noise coefficient which is less than or equal to 8dB. The performance gap highlights the necessity of improvement of the prior art scheme, and provides a new direction for innovative design in the aspects of solving core problems of high noise coefficient, insufficient spurious suppression, high power consumption, low integration level and the like. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a 210-220GHz radio frequency receiving module so as to solve the core problems of high noise coefficient, insufficient spurious suppression, high power consumption, low integration level and the like in the prior art. In order to achieve the aim, the design of the module needs to meet key performance indexes, namely, noise coefficient is better than 8dB, spurious suppression is more than or equal to 40dBc, power consumption is less than or equal to 5W, and the technical scheme is ensured to be directly related to application requirements. In order to achieve the above purpose, the invention is realized by the following technical scheme: The invention provides a 210-220GHz radio frequency receiving module, which comprises a chassis and receiving circuit systems. The chassis is used as a physical carrier, and the outer wall of the chassis is provided with a power supply interface for supplying power to the operation of the whole circuit. The technical principle of the invention is as follows: A core receiving link is formed; And the radio frequency receiving link adopts a three-stage architecture of antenna, low Noise Amplifier (LNA) and I/Q mixer, and the I/Q mixer integrates a quadrature power division network and supports a second harmonic mixing mode. And the local oscillation link adopts a cascade design of phase-locked crystal oscillator, point frequency source, frequency multiplier and band-pass filter, and the 21-22GHz fundamental frequency signal is lifted to a target frequency band through a 10-frequency multiplication chain. And a local oscillator interface, an intermediate frequency interface and a radio frequency interface are arranged in the case. The local oscillator interface is used for introducing external reference or monitoring the internal clock state, the intermediate frequency interface is used for outputting intermediate frequency signals, and the radio frequency interface is used for receiving radio frequency signals of 210-2