Title: Miniaturization and Gain Enhancement of Wideband Low-profile Antennas on Engineered Structures
1- Miniaturization and Gain Enhancement of Wideband
Low-profile Antennas on Engineered Structures - Presented by -
- Faisal Abedin
- (Doctoral Candidate)
- Department of Electrical Engineering
- University of South Carolina, Columbia, SC 29208
- E-mail abedin_at_engr.sc.edu
- Advisor Dr. Mohammod Ali
2Biography
- Education
- Doctoral Candidate (GPA 3.92)
- Major Electrical Engineering (Start Date
Spring 2003) - Department of Electrical Engineering
- University of South Carolina, Columbia, SC
- M.S. in Electrical Engineering, May 2001
- Department of Electrical and Computer
Engineering - North Carolina State University, Raleigh, NC
- B.S. in Electrical Engineering, September 1999
- Department of Electrical Engineering
- Bangladesh University of Engineering and
Technology, Dhaka, Bangladesh - Research Interest
- Electromagnetic Band-gap (EBG) Structures and
their Antenna Applications - Antenna miniaturization
- Diversity antennas
2
3Outline
- Introduction
- Novel concept to design ultra-thin Mobile Phone
Antennas - Introduction to Engineered Structures called
Electromagnetic Bandgap (EBG) structures - Three-dimensional EBG structures
- Planar EBG structures
- Phase profile of EBG structures
- Application of Planar EBG structures
3
4Introduction
Personal Communication Systems
Commercial Defense Applications
UAV
Satellite
Mobile Data System
GPS
3
5Novel Design Concept for Mobile Antennas
Application Mobile Antennas
Dual band antenna on Modified ground plane
Dual band antenna on Conventional ground plane
Proposed a Novel Slow-wave Structure
4
6Novel Design Concept for Mobile Antennas
- Accomplishments
- Increases the antenna electrical length by
uniformly spreading current - Increases the antenna bandwidth by 3 to 4 times
- Reduces the antenna height by 2.5 times
M. F. Abedin and M. Ali, Modifying the Ground
Plane and its Effect on Planar Inverted-F
Antennas (PIFAs) for Mobile Phone Handsets,
IEEE Antennas and Wireless Propagation Letters,
vol.2, no. 15, pp. 226-229, 2003.
5
7Antenna Miniaturization using Engineered
Structures
- Applications of Dipole Antenna Array
- Ground-based
- Vehicular
- Air-borne applications
UAV
Conventional Dipole Array Configuration
6
8Antenna Miniaturization using Engineered
Structures
Proposed Solution
Engineered Structure (EBG)
- Thin antenna structure
- Light-weight and compact
- Directional
- Wideband
Goals
7
9Antenna Miniaturization using Engineered
Structures
Phase Profile of EBG Structures
Phase profile
Phase (Degrees)
Frequency (GHz)
8
10Antenna Miniaturization using Engineered
Structures
Dipole Antenna Performance on Proposed EBG
Structure
Reflection (decibels)
EBG Top View
- Accomplishments
- Reduced antenna height by 9 times
- Attained sufficient antenna bandwidth
- Increased antenna Gain and Efficiency
M. F. Abedin and M. Ali, Effects of EBG
Reflection Phase Profiles on the Input Impedance
and Bandwidth of Ultra-thin Directional
Dipoles, IEEE Transactions on Antennas and
Propagation (under revision).
9
11Novel Planar EBG Structures
Applications Planar EBG ? Mobile phones ?
Wireless LAN ? Satellite ? JTRS ? Global
Positioning System
Unit cell of proposed Planar EBG Structure
Top-view
Advantages Planar EBG ? Extremely low cost ?
Easy to fabricate
Transmission (decibels)
Stopband 3.5 4.5 GHz
10
12Application of Planar EBG Structures
Mutual Coupling (decibels)
Coupling reduced by 13 dB
11
13Application of Planar EBG Structures
Without EBG
With EBG
Nulls Eliminated
Null Points No Signal
- Accomplishments
- Increased bandwidth by 31
- Reduced coupling by 13 dB
- Eliminated Nulls in Radiation Pattern
- Increased antenna Gain
M. F. Abedin and M. Ali, Application of EBG
Structures to Reduce the Mutual Coupling between
Linear Antenna Elements of an Array, IEEE
Antennas and Wireless Propagation Letters
(submitted March 2005).
12
14Broader Dissemination
- Actively involved in disseminating knowledge to
the broader community - Mentored two High School Seniors through SPRI
program in previous years - This summer an 11th Grade student will be
mentored to conduct research - An undergraduate EE student of USC will be guided
this summer funded through an NSF REU grant
13
15Relevant Publications
- M. F. Abedin and M. Ali, Modifying the Ground
Plane and its Effect on Planar Inverted-F
Antennas (PIFAs) for Mobile Phone Handsets,
IEEE Antennas and Wireless Propagation Letters,
vol. 2, no. 15, pp. 226-229, 2003. - M. F. Abedin and M. Ali, Effects of EBG
Reflection Phase Profiles on the Input Impedance
and Bandwidth of Ultra-thin Directional
Dipoles, IEEE Transactions on Antennas
Propagation (under revision). - M. F. Abedin and M. Ali, Application of EBG
Structures to Reduce the Mutual Coupling between
Linear Antenna Elements of an Array, IEEE
Antennas and Wireless Propagation Letters
(submitted). - M. Ali and M. F. Abedin, Designing Ultra-Thin
Planar Inverted-F Antennas, in Proc. IEEE
Antennas and Propagation Society International
Symposium Digest, vol. 3, pp. 78-81, Columbus,
OH, June 2003. - M. F. Abedin and M. Ali, Application of EBG
Substrates to Design Ultra-Thin Wideband
Directional Dipoles, in Proc. IEEE Antennas and
Propagation Society International Symposium, vol.
2, pp. 2071-2074, Monterey, CA, June 2004. - M. F. Abedin and M. Ali, Designing Ultra-Thin
Printed Dipole Arrays based on EBG Reflection
Phase Profile, IEEE Wireless and Microwave
Technology (WAMI) Conference 2005, Clearwater,
FL, April 2005 (accepted). - M. F. Abedin and M. Ali, Reducing the
Mutual-Coupling between the Elements of a Printed
Dipole Array Using Planar EBG Structures, IEEE
Antennas and Propagation Society International
Symposium, Washington, DC, July 2005 (submitted). - M. F. Abedin, M. Ali and P. F. Wahid, Bandwidth,
Efficiency and Pattern Characteristics of
Miniaturized Embedded Antennas at 900/1900 MHz,
9th edition of the Biennial International
Conference on Electromagnetics in Advanced
Applications.(ICEAA 2005), Torino, Italy,
September 2005 (under preparation).
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