RF1419D Filters

Surface acoustic wave (SAW) filters are a type of resonator used in signal processing. They are widely used in the telecommunications, radio-frequency (RF), and audio industries. One particular SAW filter, the RF1419D, is designed to provide wide-band rejection in both the receive and transmit frequencies. This article will discuss the application field and working principle of the RF1419D.

Application Field

The RF1419D SAW filter is designed for use in a variety of wireless applications. It is used in cellular and microwave radio base stations, mobile phones, and satellite communication systems. It is also used in high-speed wireless networks such as 802.11a/b/g/n. The filter is designed to suppress interference generated in the receive and transmit bands of the wireless communication systems.

Working Principle

The RF1419D SAW filter operates on the principle of resonance. A series of piezoelectric crystals are placed along the surface of a substrate to form a thin membrane, which is then sandwiched between two conductive plates. When voltage is applied to the crystals, the resonance of the system changes, resulting in a change in the frequency response of the filter. When a signal at the resonance frequency is input to the filter, the piezoelectric crystals vibrate, producing an out-of-phase energy field that selectively reflects or absorbs the signal, thus providing wide-band frequency rejection.

In addition to the frequency-dependent rejection, the RF1419D SAW filter also provides temperature dependency control. At a given temperature, the resonance frequency of the filter will remain constant despite any changes in the operating temperature. This ensures that the filter will maintain its performance over a wide range of temperatures.

Conclusion

The RF1419D SAW filter is suitable for a wide range of wireless applications. It is designed to provide wide-band rejection for both receive and transmit frequencies. The filter operates on the principle of resonance and provides temperature compensation to ensure consistent performance over a wide range of temperatures.