A Reduced Frequency Printed Quasi-Yagi Antenna Symmetrically Loaded with Meander Open Complementary...
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Transcript of A Reduced Frequency Printed Quasi-Yagi Antenna Symmetrically Loaded with Meander Open Complementary...
A Reduced Frequency Printed Quasi-Yagi Antenna Symmetrically Loaded with Meander
Open Complementary Split Ring Resonator (MOCSRR) Elements
Joshua Anderson
Kai Johnson
Cody Satterlee
Andrew Lynch
Benjamin D. Braaten*ECE Department
North Dakota State University
Fargo, ND, USA.
APPLIED ELECTROMAGNETICS LAB
NORTH DAKOTA STATE UNIVERSITY
1) Introduction and Background
2) The Reduced frequency Quasi-Yagi Antenna
3) Measurement and Simulation Results
4) Discussion and Guidelines
5) Conclusion
Topics
NDSU : APPLIED ELECTROMAGNETICS LAB
Introduction and Background
[1] A. Velez, F. Aznar, J. Bonache, M. C. Valazquez-Ahumada, J. Martel and F. Martin, “Open complementary split ring resonators (OCSRRs) and their application to wideband CPW band pass filters,” IEEE Microwave and Wireless Component Letters, vol. 19, no. 4, pp. 197-199, Apr. 2009.
The open complementary split ring resonator (OCSRR) element [1]:
NDSU : APPLIED ELECTROMAGNETICS LAB
NDSU : APPLIED ELECTROMAGNETICS LAB
[2] B. D. Braaten, “A novel compact UHF RFID tag antenna designed using series connected open complementary split ring resonator (OCSRR) particle,” IEEE Transactions on Antennas and Propagation, vol. 58, no. 11, Nov. 2010, pp. 3728-3733.
The OCSRR element has been used to design small resonant antennas [2]:
Introduction and Background
NDSU : APPLIED ELECTROMAGNETICS LAB
Introduction and BackgroundThe meander open complementary split ring resonator (MOCSRR)
element [3]:
[3] B. D. Braaten and M. A. Aziz, “Using meander open complementary split ring resonator (MCOSRR) particles to design a compact UHF RFID tag antenna,” IEEE Antenna and Wireless Propagation Letters, vol. 9, 2010, pp. 1037-1040.
NDSU : APPLIED ELECTROMAGNETICS LAB
Introduction and BackgroundCPW structure used to measure the MOCSRR element:
NDSU : APPLIED ELECTROMAGNETICS LAB
Introduction and BackgroundPrinted MOCSRR element: S-parameters [4]:
Leq = 9.25 nHCeq = 5.1 pFfo = 735 MHz
[4] B. D. Braaten, M. A. Aziz, M. J. Schroeder and H. Li, “Meander open complementary split ring resonator (MOCSRR) particles implemented using coplanar waveguides,” Proceedings of the IEEE International Conference on Wireless Information Technology and Systems, Honolulu, Hawaii, Aug. 28 – Sep. 3, 2010.
NDSU : APPLIED ELECTROMAGNETICS LAB
Reduced Frequency Quasi-YagiA = 131.4 mmB = 145.98 mma = 22.27 mmb = 17.7 mmc = 1.3 mmd1 = 52.0 mmf = 40.98 mmi = 66.0 mmj = 12.0 mmk = 41.0 mm
m = 5.8 mmn = 9.08 mmu = 4.45 mmα = 48.28 mmβ = 15.91 mm
Substrate:Thickness:
1.27 mmPermittivity:
10.2
NDSU : APPLIED ELECTROMAGNETICS LAB
Reduced Frequency Quasi-Yagi
W = 6.88 mmH = 6.73 mmd2 = 2.45 mmg = 0.22 mmh = 4.53 mmp = 0.26 mmq = 0.32 mmr = 1.94 mms = 0.17 mmt = 0.27 mmv = 0.19 mm
Leq = 5.25 nHCeq = 5.6 pFfo = 2.2 GHz
Approx. twice the operating frequency.
NDSU : APPLIED ELECTROMAGNETICS LAB
Measurement and Simulation Results
Original unloaded quasi-yagi antenna [5]. New loaded quasi-yagi antenna.
[5] S. Chen and P. Hsu, “Broadband microstrip-fed modified quasi-yagi antenna,” Wireless Communications and Applied Computational Electromagnetics, Aug. 2005, pp. 208-211.
NDSU : APPLIED ELECTROMAGNETICS LAB
Measurement and Simulation Results
Closer image of the element.
NDSU : APPLIED ELECTROMAGNETICS LAB
Measurement and Simulation Results
Measuring the original quasi-yagi antenna. Operating frequency of 1.2 GHz.
NDSU : APPLIED ELECTROMAGNETICS LAB
Measurement and Simulation Results
Measuring the loaded quasi-yagi antenna.
35% lower operating frequency Simulated: 735 MHzMeasured: 765 MHz.
NDSU : APPLIED ELECTROMAGNETICS LAB
Measurement and Simulation Results
x-z plane at 735 MHz y-z plane at 735 MHz
• Simulated gain at 1.18 GHz was 4.1 dBi (unloaded antenna)• Simulated gain at 735 MHz was -5.5 dBi (loaded antenna)
NDSU : APPLIED ELECTROMAGNETICS LAB
Discussion and Guidelines
The input impedance of the loaded and unloaded dipole above was finally computed:
• At 800 MHz• Zeq1 = 17.2 – j97.0 Ω (without loading elements)• Zeq2 = 104.0 + j126.0 Ω (with loading elements)• Zeq= 102 Ω at 800 MHz (MOCSRR element)• Im(Zeq1 - Zeq2 ) = Im(ΔZ) ≈ 233.0 Ω ≈ 2Zeq
1) Intro. and background on the MOCSRR elements was presented.
2) The reduced frequency Quasi-Yagi antenna was introduced.
3) Measurement and simulation results were compared.
4) Initial discussion and guidelines on loading the antenna with MOCSRR elements was presented.
Conclusion
NDSU : APPLIED ELECTROMAGNETICS LAB
Thank you for listening!
Questions?
NDSU : APPLIED ELECTROMAGNETICS LAB