3

Feb 22, 2005

SAW Components

B3781

315,00 MHz

Low-loss Filter

Data Sheet

Characteristics

Reference temperature:

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

—

315,00

—

MHz

(center frequency between 3 dB points)

Minimum insertion attenuation

α

min

including loss in matching elements

—

1,8

2,5

dB

excluding loss in matching elements

—

1,1

2,0

dB

Pass band (relative to

α

314,725... 315,275 MHz

—

0,9

3,0

dB

Filter bandwidth

α

0,69

0,76

0,83

MHz

Relative attenuation (relative to

α

α

rel

10,00 ... 294,50 MHz

47

51

—

dB

294,50 ... 304,50 MHz

42

46

—

dB

304,50 ... 312,80 MHz

21

28

—

dB

312,80 ... 313,20 MHz

33

40

—

dB

313,20 ... 314,30 MHz

6

9

—

dB

316,00 ... 323,00 MHz

10

14

—

dB

323,00 ... 335,00 MHz

34

40

—

dB

335,00 ... 600,00 MHz

43

48

—

dB

600,00 ...1000,00 MHz

60

70

—

dB

1000,00 ...2500,00 MHz

43

48

—

dB

Input:

=

||

—

410 || 2,6

—

Ω || pF

Output:

—

410 || 2,6

—

Ω || pF