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New Unidirectional Antennas for Various Wireless Base Stations 237

polarization, high gain, and symmetrical E-plane radiation. After that,
we discussed a new type of wideband unidirectional antenna element—
a complementary antenna composed of a planar electric dipole and a
shorted patch antenna, which is equivalent to a magnetic dipole. This
architecture possesses advantages including a stable radiation pattern
with low cross-polarization, low backlobe radiation, nearly identical E-
and H-plane patterns, and stable antenna gain across the entire oper-
ating bandwidth. In addition, two alternative feeding structures, the
T-shaped and square-plate coupled lines, demonstrate the flexibility in
antenna feed design.

6.5 Acknowledgment
The authors would like to express their sincere thanks to Dr. C.L. Mak
and Dr. H.W. Lai for contributing some research works presented in
this chapter.

References
1. S. Dey, P. Venugopalan, K. A. Jose, C. K. Aanandan, P. Mohanan, and K.G. Nair,
“Bandwidth enhancement by flared microstrip dipole antenna,” IEEE Antennas
and Propagation Society International Symposium, 1991, vol. 1, AP-S. Digest, 24–28
(June 1991): 342–345.
2. Y. D. Lin and S. N. Tsai, “Coplanar waveguide-fed uniplanar bow-tie antenna,”
Electron. Lett., vol. 45 (1997): 305–306.
3. E. Levine, S. Shtrikman, and D. Treves, “Double-sided printed arrays with large
bandwidth,” IEE Proceedings – Part H, vol. 135, no. 1 (1988): 54–59.
4. S. Dey, P. Venugopalan, K. A. Jose, C. K. Aanandan, P. Mohanan, and K. G. Nair,
“Bandwidth enhancement by flared microstrip dipole antenna,” IEEE Antennas
and Propagation Society International Symposium, 1991, vol. 1, AP-S Digest, 24–28
(June 1991): 342–345.
5. Y. D. Lin and S. N. Tsai, “Coplanar waveguide-fed uniplanar bow-tie antenna,”
Electron. Lett., vol. 45 (1997): 305–306.
6. K. Kiminami, A. Hirata, and T. Shiozawa, “Double-sided printed bow-tie antenna for
UWB communications,” IEEE Antenna and Wireless Propagation Lett., vol. 3 (2004):
152–153.
7. J. I. Kim, B. M. Lee, and Y. J. Yoon, “Wideband printed dipole antenna for multiple
wireless services,” IEEE Radio and Wireless Conference (August 19–22, 2001):
153–156.
8. G. A. Evtioushkine, J. W. Kim, and K. S. Han, “Very wideband printed dipole
antenna array,” Electron. Lett., vol. 34 (1998): 2292–2293.
9. K. M. Luk, C. L. Mak, Y. Chow, and K. F. Lee, “Broadband microstrip patch
antenna,” Electron. Lett., vol. 34, (1998): 1442–1443.
10. C. L. Mak, K. M. Luk, K. F. Lee, and Y. L. Chow, “Experimental Study of a Microstrip
Patch Antenna with an L-shaped Probe,” IEEE Transactions on Antennas and
Propagation, vol. AP-48, no. 5 (May 2000): 777–783.
11. Y. X. Guo, C. L. Mak, K. M. Luk, and K. F. Lee, “Analysis and Design of L-Probe
Proximity Fed-Patch Antennas,” IEEE Transactions on Antennas and Propagation,
vol. AP-49, no. 2 (February 2001): 145–149.
12. H. Wong, K. L. Lau, and K. M. Luk, “Design of dual-polarized L-probe patch antenna
arrays with high isolation,” IEEE Transaction on Antenna Propagation, vol. 52,
no. 1 (January 2004): 45–52.