Limits...
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.

Show MeSH

Related in: MedlinePlus

Reconfigurable characteristic of antenna-4.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3814091&req=5

fig4: Reconfigurable characteristic of antenna-4.

Mentions: In order to render the proposed antenna more useful, three switches are used to realize the reconfigurable function. In this investigation, SW2 and SW3 are turned ON or OFF simultaneously to keep the symmetry of the antenna so as to obtain good radiation patterns. Three ideal switches are employed to evaluate the performance of the proposed reconfigurable notch band UWB antenna. To approximate the switches, SW1 is replaced by a strip line with length of 0.5 mm and width of 0.6 mm, while SW2 and SW3 are represented by two strip lines with size of 0.5 mm × 0.3 mm. The performance of the reconfigurable characteristic is shown in Figure 4. As mentioned before, antenna-4 with all the switches ON is a dual band-notched UWB antenna. When SW1 is ON and SW2 and SW3 are OFF, the proposed antenna is a UWB antenna having a notch band operating at 3.8–5.9 GHz for filtering the unwanted signals from C- and WLAN band designated above. For the case of SW1 OFF and SW2 and SW3 ON, the antenna is a band-notched UWB antenna for reducing the potential interference from 7.7–10 GHz. When all the switches are OFF, the proposed antenna is a UWB antenna covering the 2.8–12 GHz frequency band. On the other hand, it has a little mismatch around 5 GHz because of the effects of the T-SIR and the PSLR. However, it can still be used for UWB communication applications due to its wide bandwidth and its good performance discussed above and later.


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)

Reconfigurable characteristic of antenna-4.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig4: Reconfigurable characteristic of antenna-4.
Mentions: In order to render the proposed antenna more useful, three switches are used to realize the reconfigurable function. In this investigation, SW2 and SW3 are turned ON or OFF simultaneously to keep the symmetry of the antenna so as to obtain good radiation patterns. Three ideal switches are employed to evaluate the performance of the proposed reconfigurable notch band UWB antenna. To approximate the switches, SW1 is replaced by a strip line with length of 0.5 mm and width of 0.6 mm, while SW2 and SW3 are represented by two strip lines with size of 0.5 mm × 0.3 mm. The performance of the reconfigurable characteristic is shown in Figure 4. As mentioned before, antenna-4 with all the switches ON is a dual band-notched UWB antenna. When SW1 is ON and SW2 and SW3 are OFF, the proposed antenna is a UWB antenna having a notch band operating at 3.8–5.9 GHz for filtering the unwanted signals from C- and WLAN band designated above. For the case of SW1 OFF and SW2 and SW3 ON, the antenna is a band-notched UWB antenna for reducing the potential interference from 7.7–10 GHz. When all the switches are OFF, the proposed antenna is a UWB antenna covering the 2.8–12 GHz frequency band. On the other hand, it has a little mismatch around 5 GHz because of the effects of the T-SIR and the PSLR. However, it can still be used for UWB communication applications due to its wide bandwidth and its good performance discussed above and later.

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