A low-pass filter passes signals below the cutoff frequency while attenuating signals above it. It's often used to suppress high-order harmonics in electromagnetic signals or to filter out high-frequency noise after a mixer, acting as a frequency selector. This filter can significantly attenuate signals above 470 MHz, with a harmonic suppression capability of approximately 50 dBc. This is a 7th-order elliptic function low-pass filter with superior filtering steepness compared to other filters. Parameters:1. S11 Less than -20 dB, SWR Less than 1.22; 2. S22 Less than -20 dB, SWR Less than 1.22; 3. S21 -0.5 dB, insertion loss Less than 0.5 dB Color: Green Material: PCB Package Contents: 1 x Low Pass Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.