PCB manufacturer recommandations

Hi,

I've etched some EM loops:



The key is that performance depends on the etch angle. I'm therefore searching a good PCB supplier which can almost straight etch or mill or laser ?

Suggestions ?

That looks quite specific. Do you have the funds to have prototypes manufactured from several different companies?

It depends on your manufacturer: most of professional PCB producers works in a completely different way compared to home etching.
They start with a very thin layer of copper, put the photoresist on it (its thickness can reach even 50 microns) and via chemical process deposit more copper where the tracks are.
In a such way (if correctly exposed, photoresist borders are really sharp and vertical) there is almost no etch angle and copper borders are vertical.
The unneeded very thin layer of copper is etched away using ammonia (NH3): this process will almost not harm your deposited copper, so the borders will be almost straight.

So I think your problem depends only on your "home" manufacturing of PCBs. A good and professional PCB producer will give you optimal results.

Otherwise you can try to use laser "etching" devices like the ones produced by LPKF