B39941B9840P810W99

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SAW FILTERS:
Surface acoustic wave (SAW) filters have become increasingly popular in the RF electronics field due to their superior performance over other communication technology designs. SAW filters are employed in various applications such as radio-frequency (RF) front-end modulation and detection, cellular base station, Global System for Mobile Communications (GSM) receivers, cordless telephones, and space electronics. The basic working principle of SAW filters is based on a thin piezoelectric substrate and specific surface acoustic wave excitation.At the heart of SAW filter technology lies a thin disc-shaped piezoelectric substrate, usually lithium niobate (LiNbO3). When an electrical signal is applied, the piezoelectric effect of the substrate causes a stress pattern in the substrate, which then generates an acoustic wave propagating along the surface of the substrate. There are two types of wave propagation – Rayleigh waves and Love wave. Rayleigh waves propagate along the surface of the substrate in the form of a concentric circular wave, whereas Love wave propagates in a wave form known as a shear wave along the surface.The electrical signal is applied through set of electrical connections – commonly known as an array – to the surface of the substrate. Thus, an acoustic wave is generated at the electrical connections and travels in a radial direction corresponding to the array’s configuration. If the series of the electrical connections is designed such that the traveling wave is reflected at certain points along its path, then the outgoing waves would be dispersed to the environment. Consequently, the reflected waves again interfere and produce a standing wave or resonance. This resonance occurs at certain predetermined frequencies that are established by the configuration and arrangement of the electrical connections. Therefore, different acoustic signals that are propagating at different frequencies will travel different distances and get reflected at different points on the substrate, resulting in the emergence of different transmission windows (frequency bands).SAW filters employ a resonator structure consisting of an input and output interdigitated transducers (IDT). The IDT’s simultaneously provide both the electrical as well as acoustic energy for the filter. The electrical signal applied to the IDT is converted to an acoustic signal as it propagates along the surface of the substrate. This wave is reflected at certain points along its path and produces a standing wave pattern (resonance). The resonance peaks are centered around the predetermined frequencies determined by the arrangement of the IDT. Therefore, the SAW filters are resonant devices, producing band-pass responses with narrow bandwidths, sharp cut-off slopes and low insertion losses.SAW filters can be used in a variety of communication systems for frequency conditioning. As discussed earlier, these filters enable the user to stop all signals outside desired frequencies and allow only certain frequencies to pass through and can be tuned and adjusted to provide a more narrow frequency window. In addition, filters have excellent selectivity and an extremely high queue factor (Q factor), which ensures good noise reduction.Overall, frequency conditioning via SAW Filters provides significant advantages over other communication filter technologies. As the signals to be attenuated have to traverse through a filter for attenuation, the insertion loss must be minimized during the sorting process. Therefore, due to excellent selectivity, lesser insertion loss and precision frequency filtering capabilities, SAW Filters have become the choice for many designers. They offer an excellent frequency response with minimal amplitude variation and can be fabricated with excellent mechanical stability with a wide operating temperature range.

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