FILTERS IN MOBILE CELL PHONE & THEIR FUNCTION

Types of Filters in Mobile Cell Phone and Their Function
Types of Filters in Mobile Cell Phone and Their Function – Learn about different types of filters and filters used in mobile phone and their function.

Types of Electronic Filter

In a mobile cell phone, there are generally four different types of filters used to get the desired frequency which are designed according to their properties. These 4 types of filters are as follows:
  1. Low-Pass Filter
  2. High-Pass Filter
  3. Band-Pass-Filter
  4. Band-Stop Filter
Only pass-band and one stop-band frequency is available in most general type of filters.

Low-Pass Filter

A low-pass filter allows only a specific frequency to pass and stops or rejects all frequencies above the low-tuned frequency.

High-Pass Filter

A high-pass filter stops or rejects all lower frequencies below the set frequency and passes the higher frequencies.

Band-Pass Filter

This is a type of filter that passes only a specific band of frequencies and stops higher or lower bands. This type of filters may also be tuned for one or more pass bands.

Band-Stop Filter

This type of filter stops a particular band but allows passing high or low bands. This band-stop filter is almost a low pass filter and is a combination of band-pass filter.

Crystal Filter

Mobile Phone Filter
Mobile Phone Filter
A thin section of quartz can produce RESONANCE  EFFECT like an L.C. Circuit by mechanical vibrations. This property of quartz crystal is due to PIZO-ELECTRICAL EFFECT. When this is compressed, rotated or stretched, this crystal can be stimulated by input voltage or generated output voltage. There are one or more piezoelectric crystals in a crystal filter which make resonant or anti-resonant circuit. Therefore, crystal filter is an ELECTRONIC COMPONENT that passes a selected frequency like a resonant filter.

SAW (Surface Acoustic Wave) Filter

SAW filter is used to receive desired frequencies from the range of frequencies. A SAW filter produces ultrasonic waves which are prepared by aching technique. It is made on a plate of piezoelectric material. PIEZOELECTRIC materials convert electrical signal into mechanical vibrations. Two electrodes are made at the output end of the plate like the teeth of combs combined to adjust. These tooth like electrodes perform as tuned electrical circuit. Signals of appropriate WAVELENTH and phase can be obtained from it. Similarly two electrodes are provided at the input terminal of the plate which performs as receiver.

Working System of SAW (Surface Acoustic Wave) Filter

When AC signal is given at the input terminal of a SAW filter, mechanical vibration is produced because when the signal passes between the two electrodes at the input terminal and reaches piezoelectrical plate, this vibration is converted into mechanical waves and the electrodes at the output terminal receive these waves and send out the desired controlled frequency of the phase after converting them to electrical signals. High input impedance of SAW filter is the prime drawback of this filter. As a reason, the input signal has to be amplified before directly sending to the SAW filter.

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