1. SHOULDER ELECTRONICS LTD
The Difference of the SAW FILTER Design between SHOULDER and Competitor
SHOULDER ELECTRONICS LTD

2. CONTENTS
Background
The interface of the Program of SAW Filter Designing—Developed by SHOULDER
Examples of single channel SAW Filter Designing—SHOULDER
3-1. BF36A1Dc VS X6966D 3-2. BF36A2Dc VS X6857D
3-3. BF36A8Dc VS X6874D 3-4. BF37A6Dc VS X6783X
3-5. BF44A12Dc VS X6764D 3-6. VF389A1Dc VS K3953D
3-7. VF389A6Dc VS K3965D
Competitor’s Patent about dual channel SAW Filter
SHOULDER’s design principle of a dual channel filter
Examples of dual channel SAW Filter Designing –SHOULDER
6-1. BF36A5Dc VS X7251D 6-2. BF36A7Dc VS X7250D
6-3. BF36A11Dc VS X7255D
Conclusion

3. 1. Background
Shoulder is a famous SAW FILTER manufacture in China, and serves our Customer with improving quality and competitive price for several years.
Shoulder has an experienced and powerful R&D team, and always dedicate to development and research of SAW Technology . and resulted in intellectual property , and obtained many national patents.
Patent no. ZL ; ZL ; ZL ; ZL ;
For the purpose of Holding the market, Shoulder’s competitor libels that Shoulder has some Paten issue.
Shoulder will apply some example as follow to show the difference between our own design technology and our Competitor’s

4. 2. The interface of the Program of SAW Filter Designing—developed by SHOULDER

5. 3. Examples of single channel SAW Filter Designing
3-1. BF36A1Dc VS X6966D
ITD of E X6966D
IDT of SHOULDER BF36A1Dc
The outline sketch of two input ITD’s

6. Compare BF36A1Dc with E X6966D Group delay BF36A1Dc & theory result
Frequency response

7. 3-2. BF36A2Dc VS X6857D
Input IDT of E X6857D
Input IDT of SHOULDER BF36A2Dc
The outline sketch of two input ITD’s

8. Compare BF36A2Dc with E X6857D BF36A2Dc & theory result
Frequency response
Group delay

9. 3-3. BF36A8Dc VS X6874D
IDT of E X6874D
IDT of SHOULDER BF36A8Dc
The outline sketch of two input ITD’s

10. Compare BF36A8Dc with E X6874D BF36A8Dc & theory result
Frequency response
Group delay

11. 3-4. BF37A6Dc VS X6783X
Input IDT of E X6783X
Input IDT of SHOULDER BF37A6Dc
The outline sketch of two input ITD’s

12. COMPARED WITH E X6783X BF37A6Dc with theory result Frequency response
Group delay

13. 3-5. BF44A12Dc VS X6764D
Input IDT of E X6764N
Input IDT of SHOULDER BF44A12Dc
The outline sketch of two input ITD’s

14. Compare BF44A12Dc with E X6764N BF44A12Dc with theory result
Frequency response
Group delay

15. 3-6. VF389A1Dc VS K3953D
Input IDT of E K3953D
Input IDT of SHOULDER VF389A1Dc
The outline sketch of two input ITD’s

16. Compare VF389A1Dc with E K3953D VF389A1Dc & theory result
Frequency response
Group delay

17. 3-7. VF389A6Dc VS K3965D
Input IDT of E K3965D
Input IDT of SHOULDER VF389A6Dc
The outline sketch of two input ITD’s

18. Compare VF389A6Dc with E K3965D VF389A6Dc & theory result
Frequency response
Group delay

19. 4. E Patent about dual channel SAW Filter
US Patent No
Data of Patent: Feb. 2, 1999
Apply to E’s X72**, K72** series

20. 5. SHOULDER’s design principle of a dual channel filter
Step 1, make a narrow band filter
Step2, make a differential filter
Step 3, narrow band filter + differential filter
Step4, have a wide band filter

21. 6. Examples of dual channel SAW Filter Designing –SHOULDER
6-1. BF36A5Dc VS X7251D
Input IDT of E X7251D
Input IDT of SHOULDER BF36A5Dc

22. Compare BF36A5Dc with E X7251D CH1
BF36A5Dc & theory result
Frequency response
Group delay

23. Compare BF36A5Dc with E X7251D CH2
BF36A5Dc & theory result
Frequency response
Group delay

24. 6-2. BF36A7Dc VS X7250D
Input IDT of E X7250D
Input IDT of SHOULDER BF36A7Dc

25. Compare BF36A7Dc with EX7250D CH1
BF36A7Dc & theory result
Frequency response
Group delay

26. Compare BF36A7Dc with E X7250D CH2
BF36A7Dc & theory result
Frequency response
Group delay

27. 6-3. BF36A11Dc VS X7255D
Input IDT of E X7255D
Input IDT of SHOULDER BF36A11Dc

28. Compare BF36A11Dc with E X7255D CH1
BF36A11Dc & theory result
Frequency response
Group delay

29. Compare BF36A11Dc with E X7255D CH2
BF36A11Dc & theory result
Frequency response
Group delay

30. 7. Conclusion SHOULDER has own SAW FILTER Design technology
There are no relation to other competitor

31. Thank you !