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HI saulbit
I have some experience on DDS and PLL hybird frequency synthsizer.if you use the DDS output as ADF4107 reference input,the spurs of output spectrum will be amplified as 20*log(N),so the purity of output spectrum won't be well.
you can improve the spurs by using mixer-PLL,that...
Re: Loss on narrow microstrip line & on wide microstrip
generally speaking,the narrow one 'lossing is low!
you can see a structure of microstrip to waveguide, wideband insert loss is about 1 dB but narrow band could be more than less than 0.3 dB!
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