Inductively or Capacitive Coupled?

[chiques]

I have a transmission line and need to couple the RF path. What determines if I need to couple it inductively or capacitively?

 

[biff44]

your question is oddly worded. if you are at one freuqncy, it does not matter if it is inductive or capacitively coupled. If it is broadband, a inductive coupling will look like a lowpass filter, a capacitive coupling will look like a highpass filter.

 

[chiques]

your question is oddly worded. if you are at one freuqncy, it does not matter if it is inductive or capacitively coupled. If it is broadband, a inductive coupling will look like a lowpass filter, a capacitive coupling will look like a highpass filter.

I guess I would be broadband. My system is operating between the HF and VHF spectrum's. With that respect, your explanation would presume I have a LPF which would be inductively reactive?

I did notice that if I couple to this signal using an inductor, my lower frequencies are have more loss than the mid range bands. Not sure what this means.

Sorry for my ignorance.

 

[FvM]

The question is still unclear. What do you exactly mean with "couple" the RF path? Are you talking about impedance matching?

A transmission line transformer might be an option.