The low pass filter allows signals below the cutoff frequency to pass, while signals above the cutoff frequency are attenuated. It is commonly used for suppressing higher harmonics of electromagnetic signals or placed at the output end of a mixer to reduce high-frequency interference, helping to maintain signal integrity. This filter provides significant attenuation for signals above 470 MHz, with harmonic suppression capability reaching approximately 50 dBc.Compared to other filter types such as Butterworth and Chebyshev, elliptic filters offer narrower transition bandwidths and superior performance in terms of roll-off steepness for the same filter order. This model is a 7th-order elliptic function low-pass filter, providing enhanced filtering steepness and improved stopband attenuation.Specifications: 1. S11 less than -20 dB, voltage standing wave ratio (VSWR) less than 1.22 2. S22 less than -20 dB, voltage standing wave ratio (VSWR) less than 1.22 3. S21 greater than -0.5 dB, insertion loss less than 0.5 dB 4. PCB dimensions (without SMA connector): 36 mm x 16 mm Color: Green Material: FR4 (PCB), plastic housing Package Contents: 1 x 433 MHz low pass filter Note: Light reflection and differences in display settings may cause slight variations in the color appearance. Measurement error allowance is +/- 1-3 cm.