Communication Systems - ECE Questions and Answers

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Consider the following statements as regards SAW filter

The centre frequency is determined by the pitch of IDT comb shaped electrodes
The response can be modified shaping the overlap of comb electrodes
The response is maximum when acoustic wave has its wavelength equal to pitch
When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin x)/x

Which of the above statements are correct?

1, 2, 3, 4

1, 2, 3 only

1, 2, 4 only

2, 3, 4 only