LPF Low Pass Filter Overview, Testing, and Application with RF Amplifier MMIC DDS

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Low-Pass Filter LPF 7th Order Elliptical 1-1000Mhz 3.5, 7, 14, 28, 144, 433MHz etc for RF Amlifier, Receiver, Transmitter, Mixer, Transceiver, Antenna.

A low-pass filter is a filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. These filters are usually applied after RF amplifiers (MMIC, Gain-block and Class C amplifiers) for suppression of high-order harmonics of radio-frequency signals, or placed at the mixer output to filter out high-frequency interference that plays a role in frequency selection.

An Elliptic filter (also known as a Cauer filter), compared with others filters such as Butterworth and Chebyshev of equal order can have a faster transition in gain between the passband and the stopband.

If you are ordering a custom filter, in the ordering note, specify the cutoff frequency in [MHz] at -3dB level in the range of 1 – 1000 MHz.

Сutoff frequency: choose in the selector 1 – 1000 MHz;
Low Insertion Loss S21: 0.5 – 1dB;
Standing wave ratio VSWR (S11, S22): 1.1 – 1.3;
PCB Dimensions (without SMA connectors): 35mm x 30mm;
LPF can be set for specific custom frequency
Or you can select desired frequencies from optional list:
CUSTOM FREQUENCY
1-1000MHz
LPF 1Mhz
LPF 1.8Mhz
LPF 3.5Mhz
LPF 7Mhz
LPF 10Mhz
LPF 14Mhz
LPF 15Mhz
LPF 18Mhz
LPF 20Mhz
LPF 21Mhz
LPF 28Mhz
LPF 30Mhz
LPF 40Mhz
LPF 50Mhz
LPF 70Mhz
LPF 72Mhz
LPF 100Mhz
LPF 144Mhz
LPF 200Mhz
LPF 230Mhz
LPF 250Mhz
LPF 300Mhz
LPF 315Mhz
LPF 400Mhz
LPF 433Mhz
LPF 470Mhz
LPF 500Mhz
LPF 600Mhz
LPF 700Mhz
LPF 800Mhz
LPF 868Mhz
LPF 900Mhz
LPF 915Mhz
LPF 1Ghz