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1. High Gain Directional Antenna
for WLAN and WiMAX
Applications
Guided By,
DONIA DOMINIC
Asst. Prof. Dept. of
ECE
Presented By,
VIPIN PS
Roll No : 23
Reg. No :
LMUS15EC038

2. Contents
1. Introduction
2. Antenna Design
3. 3D View Of The Antenna & Mathematical Analysis
4. Layout And Dimensions Of The Antenna
5. Advantages & Disadvantages
6. Future Scopes
7. Conclusion
8. References

3. Introduction
• WLAN(Wireless Local Area Network) is recognized as a cost-effective and
reliable for wireless communication.
• Based on IEEE 802.11a/b standards WLAN frequency band includes 2.4-
2.48, 5.15-5.25, 5.725-5.825GHz.
• In addition to WLAN applications, the antenna can be used for
WiMAX(Worldwide Interoperability for Microwave Access) applications.
• Based on IEEE802.16d/e standards WiMAX frequency band includes 2.5-
2.7 and 3.4-3.6GHz.

4. Antenna Design
• Design is based on an ultra-wide band Slot Radiating Element(SRE).
• SRE consists of a slot in the ground plane layer of a microstrip line and
a complimentary microstrip stub.
• Wideband radiating element is used as an omni-direction element in a
series fed linear array.

5. • Individual radiating element is omni-directional with low radiation
efficiency.
• Reflecting backplane was added to the SRE to ensure directional
radiation patterns and to increase the gain.
• Wideband characteristics of the slot and complimentary microstrip stub
were exploited to design a high gain directional antenna with high
radiation efficiency suitable for WLAN and WiMAX.

6. 3D View Of The Antenna

7. Layout And Dimensions Of The Antenna

8. Simulation and Measurements
• Reflection Coefficient:
 below -10 dB in WLAN and WiMAX
• Average Gain:
 for WLAN 9.2, 7.0 and 10 dBi
 for WiMAX 9.2 and 10 dBi

9. • Radiation
Pattern

10. • Polarization:
 In WLAN and WiMAX frequency bands the cross-polarizations
are less than -19 dB.
• Beam width:
 The antenna in the E-plane is stable and constant at 66° in the
lower WLAN frequency band and 49° in both of the upper WLAN
frequency bands.
 In the H-plane the antenna has good beam widths at 2.45 and
5.775GHz at 62° and 63° also at 5.2GHz beam width is 89°

11. Advantages
 A high gain, directional multi-band antenna suitable for WLAN and WiMAX
applications
 An optimized termination was realized to ensure high radiation efficiency.
 The SRE antenna structure results in an antenna with higher gain
compared to other WLAN antennas
 Compact in structure and Wall-mount access because of good front-to-
back chara. of radiation pattern.
 Good front to back characteristics

12. Disadvantages
 Below 7dB gain in one beam
 Complex design
i. Coaxial cable attaching
ii. Slot alignment

13. Future Scopes
 Can be used in WiFi (In all 3 bands)
 By using methods like Cavity
i. Increase Gain
ii. Increase Range

14. Conclusion
• A high gain, directional multi-band antenna is suitable for WLAN and
WiMAX applications.
• A reflecting ground plane ensures directional radiation patterns with
high gain.
• An optimized termination ensure high radiation efficiency.

15. • Position of the coaxial feed line was optimized to reduce coupling
between the coaxial line and radiated fields.
• The SRE antenna structure results in an antenna with higher gain
compared to other WLAN antennas.
• Good front-to-back characteristics of the radiation patterns make the
antenna suitable as a wall-mounted access point for WLAN and
WiMAX applications.

16. References
[1] B. Kelothu, K. R. Subhashini, and G. LalithaManohar, “A Compact High-Gain Microstrip Patch Antenna for Dual Band WLAN
Applications,” in Students Conference on Engineering and Systems (SCES), Allahabad, Uttar Pradesh, Mar. 2012, pp. 1–5.
[2] S. Su and C. Lee, “Low-Cost Dual-Loop-Antenna System for Dual- WLAN-Band Access Points,” IEEE Trans. Antennas
Propag., vol. 59, no. 5, pp. 1652–1659, May 2011.
[3] X. He, S. Hong, H. Xiong, Q. Zhang, and E. M. M. Tentzeris, “Design of a Novel High-Gain Dual-Band Antenna for WLAN
Applications,” IEEE Antennas Wirel. Propag. Lett., vol. 8, pp. 798–801, 2009.
[4] V. Paraforou, D. Tran, and D. Caratelli, “A dual-band supershaped annular slotted patch antenna for WLAN systems,” in The
8th European Conference on Antennas and Propagation (EuCAP 2014), The Hague, Apr. 2014, pp. 2365–2367.
[5] I. Yeom, J. M. Kim, and C. W. Jung, “Dual-band slot-coupled patch antenna with broad bandwidth and high directivity for
WLAN access point,” Electron. Lett., vol. 50, no. 10, pp. 726–728, May 2014.