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A CPW-fed circular wide-slot UWB antenna with wide tunable and flexible reconfigurable dual notch bands.

Li Y, Li W, Ye Q - ScientificWorldJournal (2013)

Bottom Line: A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications.The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR.The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8-5.9 GHz and 7.7-9.2 GHz, respectively.

View Article: PubMed Central - PubMed

Affiliation: College of Information and Communications Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China.

ABSTRACT
A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications. The dual band-notched function is achieved by using a T-shaped stepped impedance resonator (T-SIR) inserted inside the circular ring radiation patch and by etching a parallel stub loaded resonator (PSLR) in the CPW transmission line, while the wide tunable bands can be implemented by adjusting the dimensions of the T-SIR and the PSLR. The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR. The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8-5.9 GHz and 7.7-9.2 GHz, respectively. In addition, the proposed antenna has been optimized to a compact size and can provide omnidirectional radiation patterns, which are suitable for UWB communication applications.

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Radiation patterns of the fabricated antennas.
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fig8: Radiation patterns of the fabricated antennas.

Mentions: The measured results shown in Figure 7 agree well with the simulated ones, although there are minor differences. These discrepancies between the measured and simulated results may be attributed to tolerance errors in fabrication and manual welding inaccuracies. Radiation patterns of the fabricated reconfigurable dual band-notch UWB antenna with all switches ON or OFF at 3.5 GHz, 6.5 GHz, and 9.5 GHz have been measured and shown in Figures 8(a) and 8(b). It can be seen that the antenna has omnidirectional radiation characteristics in the H-plane and monopole-type radiation characteristics in the E-plane. The radiation patterns deteriorate slightly at high frequencies, and this can be attributed to the radiation of T-SIR inserted inside the radiation ring and the PSLR embedded in the CPW-fed transmission line. The gains of the fabricated antennas are derived by comparing them to a horn antenna in the chamber, and the measured results are shown in Figure 9. As discussed above, the energy at the two frequency rejection bands is not radiated so that the peak gains drop at these notched bands. We can see that the gains of the antennas with all the switches either ON or OFF are stable over the UWB operating band, with the exception of the 5.5 GHz WLAN- and C-notch bands and the 8 GHz notch band when all the switches are ON. The gain decreases by approximately −5.8 dBi in the WLAN band and by −3.9 dBi in the X-band.


A CPW-fed circular wide-slot UWB antenna with wide tunable and flexible reconfigurable dual notch bands.

Li Y, Li W, Ye Q - ScientificWorldJournal (2013)

Radiation patterns of the fabricated antennas.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814091&req=5

fig8: Radiation patterns of the fabricated antennas.
Mentions: The measured results shown in Figure 7 agree well with the simulated ones, although there are minor differences. These discrepancies between the measured and simulated results may be attributed to tolerance errors in fabrication and manual welding inaccuracies. Radiation patterns of the fabricated reconfigurable dual band-notch UWB antenna with all switches ON or OFF at 3.5 GHz, 6.5 GHz, and 9.5 GHz have been measured and shown in Figures 8(a) and 8(b). It can be seen that the antenna has omnidirectional radiation characteristics in the H-plane and monopole-type radiation characteristics in the E-plane. The radiation patterns deteriorate slightly at high frequencies, and this can be attributed to the radiation of T-SIR inserted inside the radiation ring and the PSLR embedded in the CPW-fed transmission line. The gains of the fabricated antennas are derived by comparing them to a horn antenna in the chamber, and the measured results are shown in Figure 9. As discussed above, the energy at the two frequency rejection bands is not radiated so that the peak gains drop at these notched bands. We can see that the gains of the antennas with all the switches either ON or OFF are stable over the UWB operating band, with the exception of the 5.5 GHz WLAN- and C-notch bands and the 8 GHz notch band when all the switches are ON. The gain decreases by approximately −5.8 dBi in the WLAN band and by −3.9 dBi in the X-band.

Bottom Line: A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications.The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR.The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8-5.9 GHz and 7.7-9.2 GHz, respectively.

View Article: PubMed Central - PubMed

Affiliation: College of Information and Communications Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China.

ABSTRACT
A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications. The dual band-notched function is achieved by using a T-shaped stepped impedance resonator (T-SIR) inserted inside the circular ring radiation patch and by etching a parallel stub loaded resonator (PSLR) in the CPW transmission line, while the wide tunable bands can be implemented by adjusting the dimensions of the T-SIR and the PSLR. The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR. The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8-5.9 GHz and 7.7-9.2 GHz, respectively. In addition, the proposed antenna has been optimized to a compact size and can provide omnidirectional radiation patterns, which are suitable for UWB communication applications.

Show MeSH
Related in: MedlinePlus