3

Aug 11, 2004

SAW Components

B3768

313,85 MHz

Low-loss Filter

Data Sheet

Characteristics

Reference temperature:

= –45 ... +95˚C

Terminating source impedance:

Terminating load impedance:

source- and to load impedance (here 50 Ohm). After the SAW filter is removed and input imped-

ance into the input matching / output matching network is calculated.

The conjugate complex value of these characteristic impedances are the input and output imped-

ances for flat passband. For more details, we refer to EPCOS application note #4.

min.

typ.

max.

Center frequency

—

313,85

—

MHz

(center frequency between 3 dB points)

Minimum insertion attenuation

α

min

including loss in matching elements

—

1,9

2,9

dB

excluding loss in matching elements

—

1,3

2,3

dB

Pass band (relative to

α

313,70 ... 314,00 MHz

—

0,5

2,0

dB

313,67 ... 314,03 MHz

—

0,7

3,0

dB

313,63 ... 314,07 MHz

—

1,0

6,0

dB

Filter bandwidth

α

0,54

0,59

0,64

MHz

Relative attenuation (relative to

α

α

rel

10,00 ... 293,35 MHz

48

53

—

dB

293,35 ... 303,35 MHz

45

50

—

dB

303,35 ... 311,65 MHz

25

30

—

dB

311,65 ... 312,05 MHz

33

40

—

dB

312,05 ... 313,15 MHz

13

18

—

dB

314,55 ... 321,85 MHz

13

17

—

dB

321,85 ... 335,00 MHz

38

45

—

dB

335,00 ... 600,00 MHz

43

48

—

dB

600,00 ...1000,00 MHz

60

70

—

dB

Input:

=

||

—

340 || 2,6

—

Ω || pF

Output:

—

340 || 2,6

—

Ω || pF