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Joshua Anderson Kai Johnson Cody Satterlee Andrew Lynch Benjamin D. Braaten* ECE Department

NORTH DAKOTA STATE UNIVERSITY. 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

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Joshua Anderson Kai Johnson Cody Satterlee Andrew Lynch Benjamin D. Braaten* ECE Department

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  1. NORTH DAKOTA STATE UNIVERSITY 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

  2. Topics 1) Introduction and Background2) The Reduced frequency Quasi-Yagi Antenna3) Measurement and Simulation Results4) Discussion and Guidelines5) Conclusion NDSU : APPLIED ELECTROMAGNETICS LAB

  3. Introduction and Background The open complementary split ring resonator (OCSRR) element [1]: [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. NDSU : APPLIED ELECTROMAGNETICS LAB

  4. Introduction and Background The OCSRR element has been used to design small resonant antennas [2]: [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. NDSU : APPLIED ELECTROMAGNETICS LAB

  5. Introduction and Background The 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

  6. Introduction and Background CPW structure used to measure the MOCSRR element: NDSU : APPLIED ELECTROMAGNETICS LAB

  7. Introduction and Background Printed MOCSRR element: S-parameters [4]: Leq = 9.25 nH Ceq = 5.1 pF fo = 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

  8. Reduced Frequency Quasi-Yagi A = 131.4 mm B = 145.98 mm a = 22.27 mm b = 17.7 mm c = 1.3 mm d1 = 52.0 mm f = 40.98 mm i = 66.0 mm j = 12.0 mm k = 41.0 mm m = 5.8 mm n = 9.08 mm u = 4.45 mm α = 48.28 mm β = 15.91 mm Substrate: Thickness: 1.27 mm Permittivity: 10.2 NDSU : APPLIED ELECTROMAGNETICS LAB

  9. Reduced Frequency Quasi-Yagi W = 6.88 mm H = 6.73 mm d2 = 2.45 mm g = 0.22 mm h = 4.53 mm p = 0.26 mm q = 0.32 mm r = 1.94 mm s = 0.17 mm t = 0.27 mm v = 0.19 mm Leq = 5.25 nH Ceq = 5.6 pF fo = 2.2 GHz Approx. twice the operating frequency. NDSU : APPLIED ELECTROMAGNETICS LAB

  10. 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

  11. Measurement and Simulation Results Closer image of the element. NDSU : APPLIED ELECTROMAGNETICS LAB

  12. Measurement and Simulation Results Measuring the original quasi-yagi antenna. Operating frequency of 1.2 GHz. NDSU : APPLIED ELECTROMAGNETICS LAB

  13. Measurement and Simulation Results 35% lower operating frequency Simulated: 735 MHz Measured: 765 MHz. Measuring the loaded quasi-yagi antenna. NDSU : APPLIED ELECTROMAGNETICS LAB

  14. Measurement and Simulation Results • Simulated gain at 1.18 GHz was 4.1 dBi (unloaded antenna) • Simulated gain at 735 MHz was -5.5 dBi (loaded antenna) x-z plane at 735 MHz y-z plane at 735 MHz NDSU : APPLIED ELECTROMAGNETICS LAB

  15. 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 NDSU : APPLIED ELECTROMAGNETICS LAB

  16. Conclusion 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. NDSU : APPLIED ELECTROMAGNETICS LAB

  17. Questions? Thank you for listening! NDSU : APPLIED ELECTROMAGNETICS LAB

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