3

January 14, 2009

B3746

868.60 MHz

SAW Components

SAW RF filter

Data sheet

Please read

cautions and warnings and

important notes at the end of this document.

Characteristics

Temperature range for specification:

T

= –40 ˚C to +95 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

868.60

—

MHz

Minimum insertion attenuation

α

min

—

2.6

3.4

dB

excl. loss in matching elements

—

2.0

2.8

dB

Pass band (relative to

α

868.00 ...

869.20 MHz

—

0.9

3.0

dB

Relative attenuation (relative to

α

α

rel

10.00 ...

820.00 MHz

50

55

—

dB

820.00 ...

859.00 MHz

32

36

—

dB

859.00 ...

866.60 MHz

21

25

—

dB

866.60 ...

867.20 MHz

10

25

—

dB

870.40 ...

871.40 MHz

10

15

—

dB

871.40 ...

875.00 MHz

20

24

—

dB

875.00 ...

890.00 MHz

25

30

—

dB

890.00 ...

950.00 MHz

40

45

—

dB

950.00 ... 1500.00 MHz

50

55

—

dB

1500.00 ... 2500.00 MHz

48

53

—

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 #4.

Input:

—

470 || 1.2

—

Ω || pF

—

470 || 1.2

—

Ω || pF