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From the measured S11 plots, which is about 5-6 dB, the filter is not correctly tuned. Besides, in your measurement, you need better calibration, and better grounding from your measurement connectors.
How did you connect the tank? In series to your circuit while L and C of the tank in parallell? You may also need to tune the tank frequency and get the resonant ferquency at 15 MHz, which is a dip in s21 if you measure it.
Your results look very reasonable to me. If you increase the distance of 0.1 mm to a higher value, you will see even more difference of the values which with HFSS, the fringing capacitor was included.
With ferrite core you can easily get Q of several hundreds. I remember designed and built a bandpass filter at 150 kHz with coil Q of around 600 to 800.
Look on the TDK book you will find the ferrite core material for you purpose. Good luck!
When the filter is placed before the amplifier, the overall NF is the NF of amplifier plus the insertion loss of the filter. If the filter is placed after the amplifier, the overall NF is the NF of the amplifier only provided the amplifier has sufficient gain.
However, it doesn't mean it is...
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