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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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Parametric effects of antenna-4 with all switches ON.
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fig3: Parametric effects of antenna-4 with all switches ON.

Mentions: Center frequencies of the dual notch bands can be tuned by adjusting the dimensions of the T-SIR and the PSLR. Thus, we study the effects of key parameters of the T-SIR and the PSLR to understand the tunable notch band characteristic of the antenna-4 with all the switches ON. Simulated results are obtained by using HFSS and they are displayed in Figure 3. Figure 3(a) shows the effects of L1 on the antenna performance. We can see that the center frequency of the lower notch band moves to the low frequency with the increment of L1, while the higher notch band changes slightly. This is because the increased L1 lengthens the resonance length of the T-SIR, which also increases the current path along the T-SIR. It is worth noting that the lower notch band can be tuned widely from 3.3 GHz to 5.9 GHz, which may prevent the potential interference from IEEE 802.11a WLAN system operating at 5.15–5.825 GHz, super high frequency (SHF) and satellite services operating at 4.5–5 GHz, and IEEE 802.16 WiMAX system operating at 3.3–3.7 GHz. Effects of varying W1 on the antenna performance are shown in Figure 3(b), which reveals that the center frequency of the lower notch band moves to low frequency slightly with the increase of W1. However, the bandwidth of the notch band is reduced. Thus, W1 can be used not only to control the center frequency of the lower band, but also to adjust the bandwidth of the lower notch band. Figure 3(c) describes effects of L2. With the increment of L2, the center frequency of the lower notch band shifts towards lower frequency and its bandwidth is also narrowed. Effects of W2 are demonstrated in Figure 3(d). It is found that the lower notch band moves to low frequency and its bandwidth is getting narrow with the increment of W2. This is because the increased W2 not only increases the resonance length of the T-SIR but also alters the coupling between the T-SIR and the radiating circular ring. Effects with varying L3 can be found in Figure 3(e), where it is observed that the center frequency of lower notch band moves to the low frequency with the increment of L3. Additionally, the impedance bandwidth between 5.9 GHz and 7.7 GHz is improved because of the strong coupling between the T-SIR and the circular ring. Figure 3(f) reveals the effects of W3. It can be seen that the lower notch band shifts to low frequency with the increment of W3, while the higher notch band is almost constant. Thus, the lower notch band can be tuned by adjusting the parameters L1, L2, L3, W1, W2, and W3 for desired results. Effects of L5 are described in Figure 3(g). It is observed that the higher notch band moves to the low frequency with the increment of L5. This is because the increased L5 increases the coupling between the parallel stubs, which changes the distributive capacitance and distributive inductance of the PSLR. In addition, the bandwidth of the higher notch band is narrowed. Effects of g1 are given in Figure 3(h), from where it can be seen that the higher notch band shifts to high frequency when we increase g1. This is because increasing g1 reduces the coupling of the parallel stubs. Thus, the higher notch band can be tuned by adjusting L5 and g1. Besides, the two notch bands can be designed independently by choosing the proper dimensions of the T-SIR and the PSLR.


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)

Parametric effects of antenna-4 with all switches ON.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: Parametric effects of antenna-4 with all switches ON.
Mentions: Center frequencies of the dual notch bands can be tuned by adjusting the dimensions of the T-SIR and the PSLR. Thus, we study the effects of key parameters of the T-SIR and the PSLR to understand the tunable notch band characteristic of the antenna-4 with all the switches ON. Simulated results are obtained by using HFSS and they are displayed in Figure 3. Figure 3(a) shows the effects of L1 on the antenna performance. We can see that the center frequency of the lower notch band moves to the low frequency with the increment of L1, while the higher notch band changes slightly. This is because the increased L1 lengthens the resonance length of the T-SIR, which also increases the current path along the T-SIR. It is worth noting that the lower notch band can be tuned widely from 3.3 GHz to 5.9 GHz, which may prevent the potential interference from IEEE 802.11a WLAN system operating at 5.15–5.825 GHz, super high frequency (SHF) and satellite services operating at 4.5–5 GHz, and IEEE 802.16 WiMAX system operating at 3.3–3.7 GHz. Effects of varying W1 on the antenna performance are shown in Figure 3(b), which reveals that the center frequency of the lower notch band moves to low frequency slightly with the increase of W1. However, the bandwidth of the notch band is reduced. Thus, W1 can be used not only to control the center frequency of the lower band, but also to adjust the bandwidth of the lower notch band. Figure 3(c) describes effects of L2. With the increment of L2, the center frequency of the lower notch band shifts towards lower frequency and its bandwidth is also narrowed. Effects of W2 are demonstrated in Figure 3(d). It is found that the lower notch band moves to low frequency and its bandwidth is getting narrow with the increment of W2. This is because the increased W2 not only increases the resonance length of the T-SIR but also alters the coupling between the T-SIR and the radiating circular ring. Effects with varying L3 can be found in Figure 3(e), where it is observed that the center frequency of lower notch band moves to the low frequency with the increment of L3. Additionally, the impedance bandwidth between 5.9 GHz and 7.7 GHz is improved because of the strong coupling between the T-SIR and the circular ring. Figure 3(f) reveals the effects of W3. It can be seen that the lower notch band shifts to low frequency with the increment of W3, while the higher notch band is almost constant. Thus, the lower notch band can be tuned by adjusting the parameters L1, L2, L3, W1, W2, and W3 for desired results. Effects of L5 are described in Figure 3(g). It is observed that the higher notch band moves to the low frequency with the increment of L5. This is because the increased L5 increases the coupling between the parallel stubs, which changes the distributive capacitance and distributive inductance of the PSLR. In addition, the bandwidth of the higher notch band is narrowed. Effects of g1 are given in Figure 3(h), from where it can be seen that the higher notch band shifts to high frequency when we increase g1. This is because increasing g1 reduces the coupling of the parallel stubs. Thus, the higher notch band can be tuned by adjusting L5 and g1. Besides, the two notch bands can be designed independently by choosing the proper dimensions of the T-SIR and the PSLR.

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