Two symmetrical cascade amplifiers in one cavity + layout looks very pleasing to the eye

btty038

Two symmetrical cascade amplifiers in one cavity + layout looks very pleasing to the eye [Copy link]

This picture shows that the working frequency is not low. Here are some pictures for you to see: 1. A close-up of a single tube (LOG for yourself) 2. Close-up of two tubes (combined circuit) 3. Using Allen's patch split/combination bridge 4. The overall layout of the two amplifiers

btty038

Does anyone know what PCB board the above picture is?

qwqwqw2088

There are many PCB manufacturers' customer service in the forum, waiting for answers. Generally, the more commonly used ones are FR4, glass fiber board, CEM-3 composite substrate

btty038

qwqwqw2088 posted on 2018-12-2 20:34 There are many PCB manufacturers' customer service in the forum, waiting for answers. Generally, the more commonly used ones are FR4, glass fiber board, and CEM-3 composite substrate

This can be ruled out as FR4, because the frequency of FR4 cannot reach that high. What is the frequency of GEM-3 composite substrate? There is also a glass fiber version. Can you explain it? I have never heard of it

star_66666

What?

qwqwqw2088

btty038 Published on 2018-12-2 20:44 This can be ruled out as FR4, because the frequency of FR4 cannot reach that high. What is the frequency of the GEM-3 composite substrate? There is also a glass fiber version. Can you explain it to me...

High-frequency boards generally use Teflon FR-4 and FR-5, both of which are called glass fibers. Epoxy resin is used as an adhesive, and glass fiber cloth is used as a reinforcing material. This type of board has a higher operating temperature and is less affected by the environment. This type of board is often used in double-sided PCBs. The thickness is usually 1.6MM. This substrate is suitable for various power boards and high-rise circuit boards

btty038

star_66666 posted on 2018-12-2 21:17 What is this?

These are two power amplifiers. The device in the middle is a power amplifier device from Cree. You can search online  and check the DATASHEET yourself

btty038

qwqwqw2088 Published on 2018-12-2 21:37 High frequency boards are generally made of Teflon FR-4 and FR-5, both of which are called glass fiber. Epoxy resin is used as an adhesive, and glass fiber cloth is used as a reinforcing material. ...

The RF microwaves I use most are RO4350 (4350B) and RF-35. There are also regular FR-4. Others use mixed pressure boards. I don’t know about the others.