High Pass Filter

High Pass Filters are filters that eliminate low frequency signals and permit only high frequency signals to pass through.

To understand the operation of a high pass filter, take a look at AHPF3200-01. AHPF3200-01 is a 7 section high pass filter with a cut off frequency of 3.2 GHz (or 3200 MHz). This means that a signal at 3500 MHz will pass through the filter un-attenuated. On the other hand, a Bluetooth signal, which has a center frequency of 2450 MHz, will be attenuated by at least 60 dB when it goes through the filter.

For more information about AHPF-200M-01, click here.

High Pass Filter Applications.

High pass filters are often used to filter out the spurious from an up-converter mixer.

What does this mean?

Say, you have a low frequency signal at 150MHz. You want to convert it to a higher frequency signal at 1.2 GHz using a mixer. In order to do that, you will need to inject a signal known as a local oscillator  (with a frequency of 1050 MHz) into the mixer.  This mixing will result in at least 3 signals appearing at the output of the mixer: the original 150MHz , the local oscillator and the final output of 1.2GHz.

To get rid of 150MHz and the LO, all you need to do is to add a high pass filter with a cut off frequency of 1.2GHz at the mixer’s output. The high pass filter will attenuate the 150MHz signal and the LO signal. At the same time, the 1.2GHz signal will pass through the high pass filter with minimal loss.

Another common application of a high pass filter is to cascade it with a low pass filter to form a very wideband band pass filter that spans more than one octave. For example, our filter, ABPF-520M-01 has a passband of 5 MHz to 20 MHz. Traditional design of band pass filter using Butterworth design would not be able to achieve such  a wide bandwidth. We have overcome this limitation by cascading filters. For more details on ABPF-520M-01, click here.

High Pass Filter Supplier

If you are looking for a high pass filter supplier, why not consider what an RF component company like AWG Tech has to offer for high pass filter?  We have a wide selection of high pass filters starting at cut off frequency of 1 MHz up to 16GHz.

All our filters are 100% tested in our factory to make sure that they pass all the required specifications before they are shipped out of the factory.

Our stringent Quality Inspection ensures that our customers will have a peace of mind knowing that they only receive good parts. This is also the reason why our field returns and customer complaints are practically non-existent.