hey folks i'm stuck up with this experiment of simulating a crystal lattice using an electrical analogue-an electrical transmission line consisting of an array of L-C filters.kindly explain in the folllowing contexts:-
1]how does a low pass filter simulate a monoatomic lattice and a band pass does a diatomic lattice
2]explain the frequency response of the above two kinds of filters and correlate it to the concept of conjugate mass and reduced as obatined in expressions of dispersion relation for acoustical and optical branches
2006-09-11 01:43:37 · 2 answers · asked by genie 1 in Science & Mathematics ➔ Physics
Check out the paper at the source below. This should answer all your questions.
Vega, D, Vera, S and Juany A, A computer-aided modelling
analogue for lattice dynamics. Eur. J. Phys. 18 (1997) 398–403.
2006-09-11 08:54:39 · answer #1 · answered by hfshaw 7 · 0⤊ 0⤋
A low pass filter attenuates above a frequency range, typically there is inductance or capacitance but not both. A low pass filter would have inductance in series or a capacitive shunt.
A band pass would pass a range of frequencies and would have both capacitance and inductance. Capacitive reactance is 180 degrees out of phase with inductive reactance. Capacitive impedance decreases with frequency, inductive impedance increases with frequency.
2006-09-11 15:54:16 · answer #2 · answered by Sleeping Troll 5 · 0⤊ 0⤋