New broadband antennas loaded with split ring resonators (SRR) are proposed and investigated. The results illustrate that by loading the conventional monopole antennas with an asymmetrical meander lines SRR, a lower resonance frequency mode can be excited. The dimensions of the SRR have been selected to provide a resonance close the resonance of the monopole antennas. The results illustrate that when both resonance coincide the antennas bandwidths and radiation properties can be enhanced. The length and width of the antennas are 25 × 10 ⁻ ² λ ₀ × 11 × 10 ⁻ ² λ ₀ and 25 × 10 ⁻ ² λ ₀ × 21 × 10 ⁻ ² λ ₀ at 4 GHz for monopole antennas, and 29 × 10 ⁻ ² λ ₀ × 21 × 10 ⁻ ² λ ₀ at 2.9 GHz for both monopole antennas loaded with SRR. For antennas without SRR loading, maximum of measured gains and efficiencies are 3.6 dBi and 78.5% for F-antenna, and 3.9 dBi and 80.2% for T-antenna, hence they appear at 5 GHz. For antennas with SRR loading, these parameters are 4 dBi and 81.2% for F-antenna, and 4.4 dBi and ∼83% for T-antenna, which appeared at 6 GHz. By implementing the meander lines SRR as a matching load on the monopole antennas, the resulted antennas cover the measured frequency bandwidths of 2.9–6.41 GHz and 2.6–6.6 GHz (75.4 and ∼87% fractional bandwidths), which are ∼2.4 and 2.11 times more than monopole antennas with an approximately same in size.

References

1. 1)
  - 23. Ansoft HFSSwww.ansoft.com/products/hf/hfss.
2. 2)
  - 10. Engheta, N., Ziolkowski, R.W. (Eds): ‘Metamaterials: physics and engineering explorations’ (Wiley-IEEE Press, New York, NY, USA, 2006, 440 pages).
3. 3)
  - 18. Abdollahvand, M., Dadashzadeh, G., Mostafa, D.: ‘Compact dualband-notched printed monopole antenna for UWB application’, IEEE Antennas Wirel. Propag. Lett, 2010, 9, pp. 1148–1151 (doi: 10.1109/LAWP.2010.2091250).
4. 4)
  - 17. Alibakhshi-Kenari, M.: ‘Introducing the new wide band small plate antennas with engraved voids to form new geometries based on CRLH MTM-TLs for wireless applications’, Int. J. Microw. Wirel. Tech., 2014, 6, (Special Issue 6), pp. 629–637 (doi: 10.1017/S1759078714000099).
5. 5)
  - 15. Caloz, C., Itoh, T.: ‘Novel microwave devices and structures based on the transmission line approach of meta-materials’. IEEE Int. Symp. on Microwave Theory and Techniques Digest, Philadelphia, USA, June 2003, pp. 195–198.
6. 6)
  - 21. Wu, S.J., Kang, C.H., Chen, K.H., Tarng, J.H.: ‘Study of an ultra wideband monopole antenna with a band-notched open-looped resonator’, IEEE Trans. Antennas Propag., 2010, 58, (6), pp. 1890–1897 (doi: 10.1109/TAP.2010.2046839).
7. 7)
  - 13. Alu, A., Bilotti, F., Engheta, N., Vegni, L.: ‘Sub-wavelength, compact, resonant patch antennas loaded with metamaterials’, IEEE Trans. Antennas Propag., 2007, 55, (1), pp. 13–25 (doi: 10.1109/TAP.2006.888401).
8. 8)
  - 16. Schussler, M., Freese, J., Jakoby, R.: ‘Design of compact planar antenna using LH-transmission lines’. IEEE MTT-S Int. Microwave Symp., June 2004, vol. 1, pp. 209–212.
9. 9)
  - 2. Jo, S., Choi, H., Shin, B., Oh, S., Lee, J.: ‘A CPW-Fed rectangular ring monopole antenna for WLAN applications’, Int. J. Antennas Propag., 2014, 2014, article id 9519, 6 pages, (doi: 10.1155/2014/951968).
10. 10)
  - 22. Movahedinia, R., Azarmanesh, M.N.: ‘A novel planar UWB monopole antenna with variable frequency band-notch function based on etched slot-type ELC on the patch’, Microw. Opt. Technol. Lett., 2010, 52, (1), pp. 229–232 (doi: 10.1002/mop.24853).
11. 11)
  - 4. Zuo, S., Yin, Y., Zhang, Z., Wu, W.: ‘A compact tri-band PIFA antenna for WLAN and WiMAX applications’, Microw. Opt. Technol. Lett., 2010, 52, (4), pp. 919–922 (doi: 10.1002/mop.25052).
12. 12)
  - 26. Ikonen, P.M.T., Maslovski, S.I., Simovski, C.R., Tretyakov, S.A.: ‘On artificial magnetodielectric loading for improving the impedance bandwidth properties of microstrip antennas’, IEEE Trans. Antennas Propag., 2006, 54, pp. 1654–1662 (doi: 10.1109/TAP.2006.875912).
13. 13)
  - 24. Pozar, M.: ‘Microwave Engineering’ (Addison–Wesley, Reading, MA, 1993).
14. 14)
  - 5. Lee, C.T., Wong, K.L.: ‘Uniplanar printed coupled-fed PIFA with a band-notching slit for WLAN/WiMAX operation in the laptop computer’, IEEE Trans. Antennas Propag., 2009, 57, (4), pp. 1252–1258 (doi: 10.1109/TAP.2009.2015843).
15. 15)
  - 20. Alibakhshi-Kenari, M.: ‘A new compact UWB traveling-wave antenna based on CRLH-TLs for embedded electronic systems’, Int. J. Microw. Wireless Tech., 2014, pp. 1–4, doi: http://dx.doi.org/10.1017/S1759078714001020.
16. 16)
  - 14. Sanada, A., Caloz, C., Itoh, T.: ‘Zeroth order resonance in the left-handed transmission line’, IEICE Trans. Electron., 2004, 87-C, (1), p. 17.
17. 17)
  - 19. Lee, C.J., Leong, K.M.H., Itoh, T.: ‘Broadband small antenna for portable wireless application’. Int. Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT 2008, 4–6 March 2008, pp. 10–13.
18. 18)
  - 7. Alibakhshi Kenari, M.: ‘Printed planar patch antennas based on metamaterial’, Int. J. Electron. Lett., 2014, 2, (1), pp. 37–42 (doi: 10.1080/21681724.2013.874042).
19. 19)
  - 9. Lee, C.J., Leong, K.M.K.H., Itoh, T.: ‘Composite right/left-handed transmission line based compact resonant antennas for RF module integration’, IEEE Trans. Antennas Propag., 2006, 54, (8), pp. 2283–2291 (doi: 10.1109/TAP.2006.879199).
20. 20)
  - 2. Caloz, C., Itoh, T., Rennings, A.: ‘CRLH metamaterial leaky-wave and resonant antennas’, IEEE Antennas Propag. Mag., 2008, 50, (5), pp. 25–39 (doi: 10.1109/MAP.2008.4674709).
21. 21)
  - 8. Lai, A., Caloz, C., Itoh, T.: ‘Composite right/left-handed transmission line metamaterials’, IEEE Microw. Mag., 2004, 5, (3), pp. 34–50 (doi: 10.1109/MMW.2004.1337766).
22. 22)
  - 3. Anguera, J., Andújar, A., Huynh, M.C., Orlenius, C., Picher, C., Puente, C.: ‘Advances in antenna technology for wireless handheld devices’, Int. J. Antennas Propag., 2013, 2013, article id 838364, 25 pages (doi: 10.1155/2013/376531).
23. 23)
  - 6. Jofre, L., Cetiner, B.A., De Flaviis, F.: ‘Miniature multi-element antenna for wireless communications’, IEEE Trans. Antennas Propag., 2002, 50, pp. 658–669 (doi: 10.1109/TAP.2002.1011232).
24. 24)
  - 11. Caloz, C., Itoh, T.: ‘Electromagnetic metamaterials: transmission line theory and microwave applications, the engineering approach’ (John Wiley & Sons, New York, 2005, 376 pages).
25. 25)
  - 25. Ziolkowski, R.W.: ‘Design, fabrication, and testing of double negative metamaterials’, IEEE Trans. Antennas Propag., 2003, 51, pp. 1516–1529 (doi: 10.1109/TAP.2003.813622).
26. 26)
  - 1. Jee, Y., Seo, Y.M.: ‘Triple-band CPW-fed compact monopole antennas for GSM/PCS/DCS/WCDMA applications’, Electron. Lett., 2009, 45, (9), pp. 446–448 (doi: 10.1049/el.2009.3383).

Bandwidth and radiation specifications enhancement of monopole antennas loaded with split ring resonators

References

Related content