naman.barmecha
Newbie
Hi,
I had designed a 4 layer PCB board for 13 GHz using RO4003 as substrate material. In oder to get the feel of designing boards at these frequencies, I started with a 50 Ohm microstrip. The microstrip forms the top layer, and the remaining 3 bottom layers are stitiched together as ground. For some reason, I see resonances and high insertion loss at fequencies greater than 9 GHz. But, if I peel off the bottom two layers and convert the 4 layer board to 2 layer board, it works fine. Has anyone experienced the same problem or can provide some guidance on solving and understanding this issue.
Thanks,
Naman
I had designed a 4 layer PCB board for 13 GHz using RO4003 as substrate material. In oder to get the feel of designing boards at these frequencies, I started with a 50 Ohm microstrip. The microstrip forms the top layer, and the remaining 3 bottom layers are stitiched together as ground. For some reason, I see resonances and high insertion loss at fequencies greater than 9 GHz. But, if I peel off the bottom two layers and convert the 4 layer board to 2 layer board, it works fine. Has anyone experienced the same problem or can provide some guidance on solving and understanding this issue.
Thanks,
Naman