etmabreu
Full Member level 3
Another problem I am facing currently and I can't get a satisfactory answer on books.
Like I said on another topic, I'm working on a PCB at 5.8 GHz and I am limited to 2 layers (one of them, of course, will be the ground plane). For microwave traces I used microstrip.
Moreover, I will use a tinfoil can as EMI shielding on the top layer. That can will be subdivided in its interior in several subsections (transmitter, low noise amplifier and downconverter). This subsections will be isolated one from another with "walls" of tinfoil.
Problem is I need to route a few microstrip lines from one section to another. This means I need to cut a few "mouseholes" on the "walls".
My question: how large and how high should these "mouseholes" be?
If I make those holes too narrow and too low they will affect stripline impedance.
On the other hand, if I make the holes too big they will render EMI shielding useless.
So, how to compute the dimensions of the hole? Is there a "rule of thumb" that can be used to design those holes wuth, say, 0.1 dB return loss and still effective EMI shielding?
Like I said on another topic, I'm working on a PCB at 5.8 GHz and I am limited to 2 layers (one of them, of course, will be the ground plane). For microwave traces I used microstrip.
Moreover, I will use a tinfoil can as EMI shielding on the top layer. That can will be subdivided in its interior in several subsections (transmitter, low noise amplifier and downconverter). This subsections will be isolated one from another with "walls" of tinfoil.
Problem is I need to route a few microstrip lines from one section to another. This means I need to cut a few "mouseholes" on the "walls".
My question: how large and how high should these "mouseholes" be?
If I make those holes too narrow and too low they will affect stripline impedance.
On the other hand, if I make the holes too big they will render EMI shielding useless.
So, how to compute the dimensions of the hole? Is there a "rule of thumb" that can be used to design those holes wuth, say, 0.1 dB return loss and still effective EMI shielding?