Patents

1. Partially reflective surface antenna
US7548217B2

2. Bandwidth enhancement multi-resonator antenna
GB 2414346

3. Variable slot size reflectarray
JP 4249189

4. Dual band antenna
JP 4182118

5. CPW-fed CP antenna
M351460

6. CPW-fed CP antenna
JP 3146620

7. The Nan Chang, ¡§Partially reflective surface¡¨, Japan, 3144173, July, 2008

8. The Nan Chang, ¡§Enhanced gain for RFID reader¡¨, U.S. 7388500 B2, June, 2008

9. The Nan Chang, ¡§multiple-slot type of feeding¡¨, U.S. 7382320, June,2008

10. The Nan Chang, ¡§ring fed four-patch antenna¡¨, U.S. 7362272,April, 2008

11. The Nan Chang, ¡§Circularly polarized antenna¡¨, Japan 415735, March, 2008

12. The Nan Chang, ¡§Partially reflective surface antenna:¡¨, U.S. Patent 7319427, Jan., 2008

13. The Nan Chang, ¡§Dual band circularly polarized antenna¡¨, , U.S. Patent 7315283, Jan., 2008

14. T.N. Chang, and K.H. Lu, ¡§Circularly polarized array antenna¡¨, U.S. Patent 7271768, Sep.,2007

15. T.N. chang and Bor-Tseng Chen, ¡§Reflecting board with variable slot size for a microstrip reflectarray¡¨, U.S. Patent 7259721, Aug.21,2007

16. T.N. Chang and Y.L.Lin, ¡§microstrip reflective array antenna adopting a plurity of u-slot patch¡¨, U.S. Patent 71611539, Jan.9, 2007

17. T.N. Chang, and H. R. SuChen ,¡¨Stacked microstrip reflectarray¡¨ U.S. Patent 7026998, April.11, 2006

18. T.N. Chang and Y. C. Wei. "Bilayer reflector antenna¡¨ U.S. Patent 6861987 B2 , March 1, 2005

19. T.N. Chang and H.Chen, ¡¨Reflectarray¡§, China Patent ZL 2004 2 0104891.7

20. T.N. chang and Bor-Tseng Chen, ¡§Reflecting board with variable slot size for a microstrip reflectarray¡¨, Taiwan Patent: TW I 273739 , 2007/2/11

21. T.N. Chang amd Y.L. Lin, ¡¨Slot loaded microstrp Refectarray ¡§ Taiwan Patent TW I 241741,2005/10/11

22. T.N.Chang,and Y.C. Wei,"Proximity-Coupled Microstrip reflectarray" Taiwan Patent TW 203285 ,2004/6/1  

23. T.N. Chang, and H.Chen,¡¨Quad-EMC Microstrip reflectarray¡¨, Taiwan Patent TW M255524 ,2005/1/11

24. T.N. Chang, and K.H. Lu, ¡§Circularly polarized array antenna ¡§, U.S. patent 7271768, Sep.18, 2007

25. T.N. Chang, and K.H. Lu, ¡§Circularly polarized array antenna ¡§, Taiwan Patent TW 239681, 2005/9/1-2024/12/21

26. 12 T.N. Chang,¡¨Dual operational frequency slot antenna¡¨, U.S. patent 7006048, Feb.,28, 2006

27 T.N.Chang,and C.C.Kuo, ¡§Multi-frequency antenna¡¨, Taiwan Patent TW 200182, 2004/4/11-2023/5/25

28 T.N. Chang and C.M. Wang,¡¨ Dual-band Slot Antenna,¡¨ Taiwan Patent TW I232007 , 2005/1/18-2023/9/14

29 T.N. Chang, ¡§Enhance signal strength in RFID applications¡¨ Taiwan Patent TW I258015 , 2006/7/11-2025

30 T.N. Chang, and Hsu-Hsien Sun, ¡§Dual band antenna¡¨, Taiwan Patent TW I260821 , 2006/7/11-2025

31 T.N. Chang, and C.S. Chou, ¡§Partially reflector antenna¡¨, Taiwan Patent TW I261386 , 2006/9/1

32 T.N. Chang, and S.W. Lin,¡¨Method to excite QUAD-unit¡¨, Taiwan Patent TW I269487 , 2006/12/21

33 T.N. Chang, ¡§Dual band dual circularly polarized antenna¡¨, Taiwan Patent TW 288500, 2007/10/11