Of course it is still useful. First you may not need good rejection at all out-of-band. You may just need good reject close to the in-band frequency. Secondly you can use another filter for extra filtering, for example a lowpass filter to obtain better rejection at out-of-band frequency.
That is quite depending on your working frequency. What is the frequency of your signal? And what is bandwidth? How much out-of-band rejection do you need?@cariban so there are pros and cons for this transmission lines filter. I wonder, if I want to use this filter to be the first BPF in RX chain, before LNA which is broadband, should I add additional LPF between them? or maybe it will be better to design a different single BPF?
Is the advantage of using this filter over Lumped component one is only for higher frequencies?
6GHz leads to about 25 mm wave length (assume dielectric constant of 4). So the size of distributed filter has been reduced to the feasible range, while it still occupies more PCB area than lumped-filter. But lumped-filter at this frequency may be difficult to play with. The other option is to buy the filter in shelf, for example from mini-circuits:
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