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I've read about TDR methods.
However, I do not have TDR systems. What I have is VNA (Vector Network Analyzer). So what connectors or probes should I need to measure characteristic impedance of lines on PCB? And how to measure?
Hi all,
I've got a trouble in measuring real characteristic impedance of very small transmission line on a real RF PCB.
The problem is the transmission lines are printed on multi-layer PCB and very small (approximation of serveral mil). And I need to measure characteristic impedance of these...
Thanks, Jiripolivka
However, S11 -6dB is considered as margin for S11 when designing internal antenna. I really wonder why we've got this figure.
For instance, when I read below papers, all of them conform to this specification (VSWR 3:1)
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Does anyone know S11 or VSWR requirement for broadband antenna applied for 4G handset?
I have read many papers that all require S11 below -6dB (VSWR < 3) in the interested frequency bands but I don't know why we can take -6dB as the margin. Could any one explain for me or show me a...
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