Military Industry of Great Powers: Build the Strongest Flanker

Okay, what is Master Tu busy with?

Drawing pictures!

Beam distribution of 6x6 phase-controlled position arrangement, beam changes after moving the phase.

Including Ji Hongbo, Gou Gong and others are also analyzing.

The principle was quickly understood.

"Except for the different emission principles, the passive phased array radar and the pulse Doppler radar are not much different!"

"The high-power transmitter of pulse Doppler radar is too difficult. The power requirement of each small transmitter of phased array radar is not high, so it is easier to solve in theory!"

"But it involves phase control and radar computers. This is our weakness!"

Although the principle is very simple, the principle of pulse Doppler radar is also very simple. People are very doubtful whether it can be made.

"Where did Teacher Zhao go?"

Jia Pengfei said: "General Master Tu, Teacher Zhao has gone to Huaqing Microelectronics Research Institute!"

"What is he doing there?"

"..."

Of course we have to address these weaknesses!

…

Tsinghua University Microelectronics Research Institute, Zhao Guoqing feels like returning to his own home when he arrives here.

He Zhenhua put down what he was doing and accompanied Zhao Guoqing personally.

"National Day, you are finally here. If you don't come, I will go find you!"

Zhao Guoqing smiled and said, "Professor He, I'm here to ask for help!"

"Ask for help?"

Thinking about so many materials and equipment sent to the 14th Institute, He Zhenhua's legs are a little weak!

Zhao Guoqing took out the drawings and said with a smile: "To make a few transistors, the process requirements are not high!"

"..."

As soon as the lithography machine was turned on, at least tens of thousands of dollars were lost. Others wanted to do it, which required various approvals. But when Zhao Guoqing came, the dean directly approved it, and the procedure was completed within ten minutes.

"Professor He, you are improving the manufacturing process and researching more advanced lithography machines, but in the end, the lithography machines can only be turned on a few times throughout the year!"

“To catch up with and surpass the world’s advanced level is the meaning of our existence!”

"How many units were sold?"

"Sell?"

"On National Day, we made a total of eight lithography machines and provided them to many universities, research institutes and factories such as the University of Science and Technology, the Academy of Sciences, and Wuxi 852 Factory..."

"Then what?"

"..."

Zhao Guoqing saw last time that this model that cannot be commercialized is difficult to sustain.

"Professor He, can you send two sets to our institute?"

He Zhenhua smiled and said: "Do you think this lithography machine was built by us? We are just the general design unit. The light source is produced by 432 Factory, the calibration is by 225 Precision Instrument Factory, the power supply is...even the final assembly is not done by us. It is assembled by Northeast 654 Factory..."

"If you want, you can apply. If the assembly team agrees, you can submit a production plan. This photolithography machine is not cheap."

"..."

Zhao Guoqing came here to produce several components this time, including high-frequency silicon controlled transistors and several gallium nitride transistors, which are core equipment used for frequency modulation and current amplification.

The slightly more difficult one is the MMIC digital moving phaser circuit. It needs to integrate more than 700 transistor integrated circuits on the size of a fingernail. The mature five-micron manufacturing process of Qingda Microelectronics is enough, cited below 8 pins, using an epoxy resin dip package.

This packaging technology made Zhao Guoqing complain.

"Professor He, is there any mature ceramic packaging technology in China?"

If this plastic package flies into the sky, it will melt when exposed to high temperatures!

"Yes, in the past two years, the country introduced a ceramic packaging equipment, and it seems to have been distributed to Factory 145!"

Zhao Guoqing nodded, as long as there is one, it will be fine. Even if there is not, a ceramic package cannot stop him. The chip can be rubbed by hand, and the ceramic package is not impossible. At worst, the yield rate will be lower.

Regardless of the process, chip production has always been a complicated matter, especially the MMIC digital phase shift circuit, which involves an eight-bit digital phase shift control. Although there are only more than 700 transistors, it has a five-layer structure and requires a mask. Just make six pieces.

Tsinghua University's masks are made by spraying photosensitive materials on the glass and printing them one by one through distributed exposure technology. The error rate is high and the time it takes is staggering.

It's not much different from manually drawing the transistors one by one.

At this time abroad, it is probably possible to use specialized chip CAD drawings and expose masks through laser printers.

"I also know about this technology. I went to Japan two years ago. In Toshiba's photolithography workshop, through the glass outside the workshop, I saw that they use lasers to print masks. The 16k storage they produced Chips are better than American products!”

"Are there any units in China that research printing masks?"

"not sure!"

"Have you never thought about importing a few units?"

He Zhenhua shook his head: "Not everything can be imported!"

Think about it, foreign countries prefer your imported products rather than tools. There are no restrictions on civilian use, but if China imports this kind of laser printer, it can only be used for military purposes.

The reason is simple, because China does not have civilian chips at all.

The production of transistors was ready on the same day, but the MMIC chip was a little late. It took half a month to complete. A simple test was conducted at the Microelectronics Institute of Tsinghua University. All these chips and transistors were brought to the factory by Zhao Guoqing. carry out testing.

Most of the equipment here is brought from various research institutes and factories, and the equipment for detecting circuits and radar waves is very complete.

On the oscilloscope, Tu Jinda was surprised to see that a small high-frequency thyristor transistor changed a low-frequency current into a high-frequency current of 10 GHz, while the gallium nitride transistor increased this current to a peak of 10 amps.

“National Day, I don’t even know what to say, this is so amazing!”

That's not all the magic. The 4x4 array used in the experiment uses an ordinary T-shaped antenna, and the length of the extended antenna is one-quarter of the wavelength. This is also a mature design, and the electromagnetic waves emitted can achieve better results.

As for the power management circuit that needs to be completed with a chip, it can now be replaced by a vacuum tube. The MMIC chip requires an eight-bit data link to control the phases. If there is no computer, you can set up a bypass and manually control the eight phases in order to complete the test.

It took the entire team nearly a month to build a mini 4x4 phased array radar transmitter.

Tu Jinda controlled the power supply. Before turning on the power supply, he said to Zhao Guoqing: "Guo Qing, if it succeeds this time, you will have made a great contribution!"

Theoretically, this has a detection range of 100km and can theoretically guide medium-range air-to-air missiles with a range of 40km.

You know, the F16 on the US sales list is equipped with a pulse Doppler radar. Although its performance is stronger than this, it is deprived of the medium-range air-to-air missile guidance function of 40 kilometers. In this way, it also makes the Chinese military The existence of Fang Shui.

But what about this one? It's installed on a fighter with a shock cone air inlet. What would happen if it had a big nose? I can’t imagine it!

"Chief Tu, let's test the machine!"

Ji Hongbo and Gou Gong were also there, as well as Jia Pengfei and Gong Wei, engineer from Factory 217.

In front of the radar, which is half the size of a television, there are thirty-six independent radiation receiving antennas.

Chief Tu pressed the switch, and as the power indicator light came on, there was a burst of electricity in the radar, but it quickly disappeared.

"There is a signal, 16db at detection point No. 1, 4db at detection point No. 2, 2db at detection point No. 5..."

After recording thirty-six data.

"Change to the next phase!"

This time it was Zhao Guoqing who exceeded it. He flipped the phase control switch, and the tube circuit under control would simulate an eight-bit control data.

"Report to Chief Tu, phase 2 has been successfully switched, and the beam level has shifted 12 degrees to the right."

"Record data!"

"4db at position 1..."

As the data was collected one by one, Tu Jinda couldn't hold back the smile on his face.

Ji Hongbo took the data and looked left and right.

"The data matches the picture I drew very well!"

Gou Gong smiled and said: "Chief Tu, we can basically confirm that the test was successful, and we can consider submitting it for project approval!"

Tu Jinda looked at Zhao Guoqing, feeling happy but also feeling powerless.

"National Day, join us in co-signing!"

As Tu Jinda just said this, the radar transmitter seemed to have some objections, and at this moment it lay down.

Zhao Guoqing did not answer, but just shook his head and said: "It's pretty good that it can last until now. Aluminum electrolyte capacitors and our inductor components cannot meet the demand!"

Components such as tantalum capacitors, polymer aluminum electrolytic solid capacitors, and high-magnetic ferrite inductors that can cope with high-frequency currents have become very urgent at this moment.

l599xl Brother’s reward is so awesome, thank you very much!