Interdigital transducer with distibuted excitation

1. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the in subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein at least one of the m subtransducers further comprises floating electrode combs having different lengths that divide the n series subtransducers.

2. The interdigital transducer of claim 1 , wherein the interdigital transducer comprises a split finger transducer.

3. The interdigital transducer of claim 1 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

4. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic subtrack having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic subtrack and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein the in subtransducers comprise a first group of subtransducers, the first group of subtransducers being connected in series to a second group of subtransducers that are connected in parallel and that are arranged on same acoustic track as the first group of subtransducers.

5. The interdigital transducer of claim 4 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

6. The interdigital transducer of claim 4 , wherein the first and second groups of subtransducers are defined by an outer busbar dividing the acoustic track into two or more subtracks; and

wherein the interdigital transducer further comprises terminals that are connected to different ones of the two or more subtracks.

7. The interdigital transducer of claim 6 , which is symmetric with respect to an axis of symmetry transversely dividing the subtracks.

8. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein the interdigital transducer comprises a recursive transducer with divided reflection.

9. The interdigital transducer of claim 8 , wherein at least one of the m subtransducers comprises floating electrode combs that divide the n series subtransducers.

10. The interdigital transducer of claim 8 , wherein the interdigital transducer comprises a split finger transducer.

11. The interdigital transducer of claim 8 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

12. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the in subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein at least one part of the n series subtransducers in at least one of the m subtransducers includes withdrawal weighting.

13. The interdigital transducer of claim 12 , wherein at least one of the m subtransducers further comprises floating electrode combs that divide the n series subtransducers.

14. The interdigital transducer of claim 12 , wherein the interdigital transducer comprises a split finger transducer.

15. The interdigital transducer of claim 12 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

16. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein at least one part of the n series subtransducers in at least one of the m subtransducers includes overlap weighting.

17. The interdigital transducer of claim 16 , wherein the interdigital transducer comprises a split finger transducer.

18. The interdigital transducer of claim 16 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

19. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein the m subtransducers, and the series subtransducers within each of the m subtransducers, are arranged symmetrically.

20. The interdigital transducer of claim 19 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

21. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x=1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers; and

wherein an excitation at a center of the interdigital transducer is greater than an excitation at an edge of the interdigital transducer.

22. The interdigital transducer of claim 21 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.

23. An interdigital transducer for a surface acoustic wave component, the interdigital transducer comprising:

an acoustic track having a width of BS ges ; and

m (m≧2) subtransducers arranged adjacent to each other on the acoustic track and connected in parallel;

wherein each of the m subtransducers comprises n series subtransducers each having a track width of BS xi (x= 1 . . . m, i=1 . . . n);

wherein:

BS

ges

=

∑

i

=

1

n

⁢

⁢

BS

xi

,

 and

 BS xi does not equal BS (x+1)i for at least two series subtransducers;

wherein subtransducers that are internal to the interdigital transducer are more evenly divided into series subtransducers than subtransducers that border an exterior of the interdigital transducer; and

wherein a product

∏

i

⁢

⁢

BS

xi

 of track widths of series subtransducers associated with an internal subtransducer with m>x>1, is larger than a product

∏

i

⁢

⁢

BS

xi

 of track widths of series subtransducers associated with a subtransducer with x=1 or m that borders the exterior of the interdigital transducer.

24. The interdigital transducer of claim 23 , wherein a series subtransducer that is in a subtransducer that borders the exterior of the interdigital transducer and that has n>i>1 has a smallest track width.

25. The interdigital transducer of claim 23 , wherein at least two of the m subtransducers comprise different numbers of series subtransducers.