3

January 31, 2013

B3786

313.85 / 315.00 MHz

SAW Components

SAW Comb filter

Data sheet

Please read

cautions and warnings and

Characteristics

Temperature range for specification:

T

= –45 ˚C to +95 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Pass band 1

Center frequency

—

313.85

—

MHz

Minimum insertion attenuation

α

min1

incl. loss in matching elements

—

2.6

3.2

dB

excl. loss in matching elements

—

2.1

2.6

dB

Pass band (relative to

α

313.70 ...

314.00 MHz

—

1.0

2.0

dB

313.67 ...

314.03 MHz

—

1.4

3.0

dB

Pass band 2

Center frequency

—

315.00

—

MHz

Minimum insertion attenuation

α

min2

incl. loss in matching elements

—

2.6

3.2

dB

excl. loss in matching elements

—

2.1

2.6

dB

Pass band (relative to

α

314.85 ...

315.15 MHz

—

1.0

2.0

dB

314.82 ...

315.18 MHz

—

1.4

3.0

dB

Relative attenuation (relative to

α

α

rel

10.00 ...

260.00 MHz

50

55

—

dB

260.00 ...

308.00 MHz

42

47

—

dB

308.00 ...

312.40 MHz

24

30

—

dB

312.40 ...

313.20 MHz

15

20

—

dB

314.30 ...

314.60 MHz

—

6

—

dB

315.70 ...

316.50 MHz

15

20

—

dB

316.50 ...

325.00 MHz

22

26

—

dB

325.00 ...

335.00 MHz

38

43

—

dB

335.00 ...

380.00 MHz

42

47

—

dB

380.00 ...

600.00 MHz

50

55

—

dB

600.00 ... 1000.00 MHz

56

60

—

dB

1000.00 ... 2000.00 MHz

50

55

—

dB

1)

Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load

impedance (here 50 Ohm). After removal of the SAW filter the input impedance of the input and output match-

ing network is calculated. The conjugate complex value of these characteristic impedances are the input and

output impedances for flat passband. For more details we refer to EPCOS application note #18.

Input:

—

425 || 4.3

—

Ω || pF

—

425 || 4.3

—

Ω || pF