The design and performance of a low-loss surface acoustic wave (SAW) reflector filter are presented. The structure is a dual-track configuration incorporating two interdigital transducers (IDTs) and reflectors in each track. Extremely wide bandwidth can be obtained if chirped IDTs and reflectors are used. From the theoretical conditions for low-loss operation of the reflector filter, a design rule for the distances between the chirped components and for their lengths is derived. Because the transfer function of the filter is predominantly determined by the reflectors, a new synthesis method for chirped reflectors has been developed. For the design of the reflectors, phase-weighting and finger-width-weighting techniques were used to reduce passband distortions and improve the shape factor and stopband rejection. The filter has been fabricated on 128° YX-LiNbO3 . The center frequency and fractional bandwidth are 200 MHz and 100 ripple is about 1 dB, and the stopband rejection is better than 35 dB     «

The design and performance of a low-loss surface acoustic wave (SAW) reflector filter are presented. The structure is a dual-track configuration incorporating two interdigital transducers (IDTs) and reflectors in each track. Extremely wide bandwidth can be obtained if chirped IDTs and reflectors are used. From the theoretical conditions for low-loss operation of the reflector filter, a design rule for the distances between the chirped components and for their lengths is derived. Because the tran...     »

128°, 200 MHz, 4 dB, broadband operation, chirped IDTs, chirped reflectors, dual-track configuration, finger-width-weighting, interdigital transducers, LiNbO3, losses, low-loss operation, mobile communication systems, mobile radio systems, passband distortions, phase-weighting, radiofrequency filters, RF filters, SAW reflector filter, shape factor, stopband rejection, surface acoustic wave, surface acoustic wave filters, synthesis method, transfer function, transfer functions, VHF, wideband operation, YX-LiNbO3     «

128°, 200 MHz, 4 dB, broadband operation, chirped IDTs, chirped reflectors, dual-track configuration, finger-width-weighting, interdigital transducers, LiNbO3, losses, low-loss operation, mobile communication systems, mobile radio systems, passband distortions, phase-weighting, radiofrequency filters, RF filters, SAW reflector filter, shape factor, stopband rejection, surface acoustic wave, surface acoustic wave filters, synthesis method, transfer function, transfer functions, VHF, wideband oper...     »