CN217563616U

CN217563616U - K/Ka down converter

Info

Publication number: CN217563616U
Application number: CN202221502404.7U
Authority: CN
Inventors: 杨学春; 廖发平
Original assignee: Chengdu Yingweite Microwave Technology Co ltd
Current assignee: Chengdu Yingweite Microwave Technology Co ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-10-11
Anticipated expiration: 2032-06-15

Abstract

The utility model discloses radio frequency circuit technical field, in particular to K/Ka down converter, in this K/Ka down converter, radio frequency input signal is through the input channel input back, through the local oscillator signal mixing that first mixer and first originally positive source provided, again through first intermediate frequency channel input to second mixer to through the local oscillator signal mixing that second mixer and second originally positive source provided, again through second intermediate frequency channel after, loop through numerical control attenuator and last stage amplification module, carry out intermediate frequency output through last stage amplification module at last. Therefore, the utility model discloses a twice frequency conversion and reasonable design can be with the input signal of K Ka frequency channel down conversion to L wave band output.

Description

K/Ka down converter

Technical Field

The utility model relates to a radio frequency circuit technical field, in particular to K/Ka down converter.

Background

The down converter is a key component of a millimeter wave receiving system, is a core component of electronic system equipment such as electronic reconnaissance, electronic countermeasure, satellite communication and testing equipment, and plays a decisive role in system performance. The technical indexes of the down converter comprise frequency conversion gain, noise coefficient, in-band flatness, attenuation control range, double-tone dynamic state and the like; moreover, in different application scenarios or working environments, performance requirements of the down converter are different, and therefore, related technical indexes need to be comprehensively considered in circuit design.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: a K/Ka downconverter is provided for downconverting an input signal in the K/Ka frequency band to the L band.

In order to achieve the above object, the present invention provides the following technical solutions:

a K/Ka downconverter, comprising:

the input channel comprises a first low noise amplifier and a first switch filter bank which are connected in sequence;

the first mixer has one input end connected to the first local oscillator, the other input end connected to the input channel, and the output end connected to the first intermediate frequency channel;

the first intermediate frequency channel comprises a first low-pass filter, a first amplifier and a first band-pass filter which are connected in sequence;

one input end of the second mixer is connected with a second local vibration source, the other input end of the second mixer is connected with the first intermediate frequency channel, and the output end of the second mixer is connected with the second intermediate frequency channel;

the second intermediate frequency channel comprises a second low-pass filter, a second amplifier and a second band-pass filter which are connected in sequence;

and the numerical control attenuator and the final stage amplification module are sequentially connected behind the second intermediate frequency channel, and intermediate frequency output is performed through the final stage amplification module.

According to a specific implementation mode, the utility model discloses an among the K/Ka down converter, first local oscillator source with set up the second switch filter bank between the first mixer to provide 25.9GHz ~ 39.2GHz high local oscillator signal and 22.8GHz ~ 31.8GHz low local oscillator signal extremely first mixer.

According to a specific implementation mode, the utility model discloses an among the K/Ka down converter, the second local oscillator source with set up the third switch filter bank between the second mixer to provide 9.6GHz ~ 9.7GHz high local oscillator signal and 6.7GHz ~ 6.8GHz low local oscillator signal extremely the second mixer.

According to a specific implementation mode, in the utility model discloses a K/Ka down converter, first switch filter bank includes: four band-pass filtering channels; the corresponding pass bands of the four band-pass filtering channels are respectively 17.7 GHz-22.3 GHz, 22.3 GHz-26.5 GHz, 26.5 GHz-31.8 GHz and 31.8 GHz-40 GHz.

According to a specific embodiment, in the K/Ka downconverter of the present invention, the input channel further comprises a fixed attenuator; furthermore, the fixed attenuator may switch the first low noise amplifier to connect with the first switched filter bank.

To sum up, compare with prior art, the beneficial effects of the utility model are that:

the utility model discloses an among the K/Ka down converter, radio frequency input signal is through the input channel input back, through the local oscillator signal mixing that first mixer and first this positive source provided, again through first intermediate frequency channel input to second mixer to through the local oscillator signal mixing that second mixer and second this positive source provided, again through second intermediate frequency channel after, loop through numerical control attenuator and the amplification module of last stage, carry out intermediate frequency output through the amplification module of last stage at last. Therefore, the utility model discloses a twice frequency conversion and reasonable design can be with the input signal down conversion of K/Ka frequency channel to L wave band output.

Description of the drawings:

fig. 1 is a frequency conversion channel link diagram of the present invention;

fig. 2 is a simulation diagram of a down conversion channel link according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the above subject matter is limited to the following embodiments, and all the technologies realized based on the content of the present invention are within the scope of the present invention.

As shown in fig. 1, the present invention provides a K/Ka down converter, which includes:

one input end of the second mixer is connected with a second local vibration source, the other input end of the second mixer is connected with the first intermediate frequency channel, and the output end of the second mixer is connected with a second intermediate frequency channel;

Specifically, a radio frequency input signal (with a frequency range of 17.7GHz to 40 GHz) enters a first mixer through an input channel, namely, the radio frequency input signal enters the first mixer after being sequentially filtered by a first low noise amplifier and a first switch filter bank. And a second switch filter bank is arranged between the first local oscillation source and the first mixer so as to provide 25.9 GHz-39.2 GHz high local oscillation signals and 22.8 GHz-31.8 GHz low local oscillation signals to the first mixer. And a third switch filter bank is arranged between the second local oscillation source and the second frequency mixer so as to provide a high local oscillation signal of 9.6 GHz-9.7 GHz and a low local oscillation signal of 6.7 GHz-6.8 GHz to the second frequency mixer.

In practice, the first switched filter bank comprises: four band-pass filtering channels; the corresponding pass bands of the four band-pass filtering channels are respectively 17.7 GHz-22.3 GHz, 22.3 GHz-26.5 GHz, 26.5 GHz-31.8 GHz and 31.8 GHz-40 GHz.

Moreover, the input channel of the K/Ka down converter of the utility model also comprises a fixed attenuator; furthermore, the fixed attenuator may switch the first low noise amplifier to connect with the first switched filter bank. Specifically, two ends of the fixed attenuator are connected in parallel with the first low noise amplifier through two switches.

According to actual link index distribution, aim at the utility model discloses a down conversion channel link of K/Ka down converter simulates, obtains the simulation diagram as shown in FIG. 2, can reach following simulation result:

a) Input frequency range: 17.7 GHz-40 GHz;

b) The number of input paths: 1 path;

c) Output frequency range: 950MHz to 1950MHz;

d) Number of output paths: 1 path;

e) Frequency conversion gain: 33dB to 37dB;

f) Noise coefficient: less than or equal to 7dB;

g) Flatness in the band: less than or equal to 2.5dB;

h) The two-tone dynamic: more than or equal to 50dB (sensitivity level-95 dBm);

i) Attenuation control range: the step is more than or equal to 55dB and is stepped by 0.5dB;

j) Intermediate frequency suppression: not less than 55dB;

k) Image frequency suppression: not less than 55dB;

l) spurious suppression: not less than 55dB (test when the output amplitude is 0 dBm);

m) 1dB compression point output power: not less than 16dBm;

n) local oscillator back radiation: less than or equal to-70 dBm;

o) input port standing-wave ratio: 1 or less than 2.5;

p) output port standing wave ratio: 1 is less than or equal to 2.0.

The utility model discloses an among the KKa down converter, radio frequency input signal is through the input channel input back, through the local oscillator signal mixing that first mixer and first this positive source provided, again through first intermediate frequency channel input to second mixer to through the local oscillator signal mixing that second mixer and second this positive source provided, again through second intermediate frequency channel after, loop through numerical control attenuator and last stage amplification module, carry out the intermediate frequency output through last stage amplification module at last. Therefore, the utility model discloses a twice frequency conversion and reasonable design can be with the input signal down conversion of K/Ka frequency channel to L wave band output.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A K/Ka downconverter, comprising:

2. The K/Ka downconverter of claim 1 wherein a second bank of switched filters is provided between the first local oscillator source and the first mixer to provide a high local oscillator signal in the range of 25.9 GHz-39.2 GHz and a low local oscillator signal in the range of 22.8 GHz-31.8 GHz to the first mixer.

3. The K/Ka down converter of claim 1, wherein a third bank of switchfilters is disposed between the second local oscillator source and the second mixer to provide a 9.6GHz to 9.7GHz high local oscillator signal and a 6.7GHz to 6.8GHz low local oscillator signal to the second mixer.

4. The K/Ka downconverter of claim 1 wherein the first switched filter bank comprises: four band-pass filtering channels; the corresponding pass bands of the four band-pass filtering channels are respectively 17.7 GHz-22.3 GHz, 22.3 GHz-26.5 GHz, 26.5 GHz-31.8 GHz and 31.8 GHz-40 GHz.

5. The K/Ka downconverter of claim 1 wherein the input channel further comprises a fixed attenuator; furthermore, the fixed attenuator may switch the first low noise amplifier to connect with the first switch filter bank.