So, at 915 MHz we get the usual -6.021 dB input to output attenuation when you have matching input and output resistors (50 Ω) and, at the 3rd harmonic of 915 MHz we see an attenuation of 27.7 dB or, a relative attenuation of about 21.5 dB. So, plugging the numbers into a simulator we get this circuit:. Picture and calculator can be found here. ![]() The example below matches to 300 Ω but, the calculator allows you to enter both ends as 50 Ω:.
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