2013 Loughborough Antennas & Propagation Conference 11-12 November 2013, Loughborough, UK

978-1-4799-0091-6/13/$31.00 2013 IEEE

A Novel UWB Circular CPW Antenna with Triple Notch Band Characteristics

B. Boroomandisorkhabi, R. A. Sadeghzadeh, F. B. Zarrabi, and E. Ghahramani Faculty of Electrical and Computer Engineering

K. N. Toosi University of Technology Tehran, Iran

Email: behzad.boroomandisorkhabi@gmail.com

AbstractThis paper presents a novel band-notched circular CPW antenna for ultrawideband (UWB) communication in WiFi and WiMAX applications. The antenna is designed for 3.110.6 GHz and added some lower frequencies to this band by novel notch method. This paper applies band-notched antenna method in order to design two lower frequencies in antenna at 2 GHz and 2.4 GHz. These frequencies are applied for DCS, PCS, UMTS, wireless applications and at IEEE 802.11b with 17.5% and 6.5% bandwidths. This paper has investigated the effect of a slot and a metallic ring on the antenna and the effect of their combination simultaneously. The current study shows the simulation of prototype antenna with full-wave numerical EM simulator software HFSS and CST Microwave Studio by finite element method (FEM) and finite difference time domain (FDTD). The total size of antenna is 52 mm 52 mm 1.6 mm, it is designed on FR4 low-cost substrate and connected to CPW 50 feed line.

KeywordsBand-notched; triple-band; ultrawideband (UWB).

I. Introduction UWB systems have been used in communication systems, medical imaging, radio communication and biomedical systems because of their wide bandwidths and economic advantages [1]-[3]. Federal communication commission (FCC) allocated the frequency for new communication technology in the range of 3.110.6 GHz and several model antennas such as circular, elliptical and rectangular that have been studied and designed for this UWB frequency [3]-[7]. The UWB systems are usually applied for WLAN (5.15-5.825 GHz) IEEE 802.11a and WiMAX (5.25-5.85 GHz) systems [7]-[9]. DCS (1.71-1.88 GHz), PCS (1.75-1.87 GHz), UMTS (1.92-2.17 GHz) and 2.4 GHz WLAN are some frequencies that are used for wireless and personal communications which are lower than UWB systems frequencies [10], [11]. Band-notched antenna techniques can be used for multiband antenna and produce lower frequencies by making thin shaped slot on antenna surface. The shaped slot has different models such as U-shape and T-shape that have been studied in many researches on CPW antennas as band-notched UWB antennas [12]-[18].

(a) (b)

Fig.1. Geometry of the printed circular disc monopole: (a) top view and (b) bottom view.

This paper presents a novel band-notched circular CPW antenna for ultrawideband (UWB) communication in WiFi and WiMAX applications. The antenna is designed for 3.110.6 GHz and added some lower frequencies to this band by novel notch method. Band-notched antenna method is applied in order to design two lower frequencies in antenna at 2 GHz and 2.4 GHz. These frequencies are used for DCS, PCS, UMTS, wireless applications and at IEEE 802.11b with 17.5% and 6.5% bandwidths. This paper has investigated the effect of a slot and a metallic ring on the antenna and the effect of their combination simultaneously. The current study shows the simulation of prototype antenna with full-wave numerical EM simulator software HFSS and CST Microwave Studio by FEM and FDTD, sequentially. The total size of antenna is 52 mm 52 mm 1.6 mm, it is designed on FR4 low-cost substrate and connected to CPW 50 feed line.

II. Antenna Design CPW antennas are the common model antennas for UWB

applications. Fig. 1 shows the geometry of designed antenna. Fig.1 (a) shows the top view of UWB band-notched antenna. The antenna contains a monopole circular patch with radius of R1 = 14 mm which is connected to the 50 SMA feed by microstrip line with width of w = 3 mm and the length of d = 12 mm. The antenna is fabricated on FR4 substrate with dielectric constant r = 4.4 and loss tangent tan = 0.02. The substrate height is h = 1.6 mm and the substrate is a square with side of s = 52 mm. The width of half circular slot shown in Fig. 1(a) is g = 1 mm and internal radius of the slot is R2 = 637

10 mm. At bottom of the substrate, a metallic ring is designed which has 1mm width and internal radius of r = 12 mm, as shown in Fig. 1(b).

III. Simulation and Design Discussion

The antenna has been simulated with full-wave numerical EM simulator software HFSS and CST Microwave Studio by FEM and FDTD, sequentially. The simulation is divided to three conditions and simulated prototype CPW antenna with following conditions. At the first part, the effect of one and two C-shaped or circular slots on CPW structure is discussed, respectively. At the second part, the effect of using bottom metallic ring on CPW structure is investigated. At last, the effect of applying the slot and ring on circular CPW structure is studied, simultaneously. Finally, the results of simulation in full-wave numerical EM simulator software HFSS and CST Microwave Studio are Compared and presented.

A. The effect of slot This paper has defined two types of slot, one model

contains one C-shaped or circular slot and another contains two C-shaped or circular slots as shown in Fig. 2 and Fig. 3, respectively. The first model makes only a weak notch band at around 4 GHz center frequency. In the second model, extra lower resonance frequencies can be produced by two adjacent circular or C-shaped slots.

Fig.2. Effect of one C-shaped slot on the band-notched characteristics of

antenna simulated with HFSS.

Fig. 2 shows the effect of applying one C-shaped or circular slot on the antenna. The first resonance decreases to 1.45 GHz but it makes 3 notch bands and bandwidth decreases. Maximum bandwidth can be achieved with one acceptable notch by applying half circle.

Fig.3. Effect of two C-shaped slots on the band-notched characteristics of

antenna simulated with HFSS.

Fig. 3 shows the effect of applying two C-shaped or circular slots on the antenna. It shows that only half circle slots result good bandwidth and cover 1.65-2.25 GHz and 2.9-10.3 GHz which is suitable for DCS, PCS, UMTS and UWB WLAN applications.

B. The effect of bottom metallic ring Fig. 4 shows the effect of applying bottom metallic ring on

the antenna and presented a comparison between two conditions, r = 12 mm and r = 13 mm. At r = 13 mm, the antenna bandwidth reduces and at r = 12 mm, it does not affect the antenna bandwidth.

Fig.4. The effect of bottom metallic ring on the antenna. 638

Fig.5. The proposed antenna simulation results with HFSS and CST

Microwave Studio.

Fig.6. The proposed antenna gain with HFSS and CST Microwave Studio.

IV. Prototype Antenna Simulation Result

At last, the ring and slot are applied simultaneously. Fig. 5 shows the results. Fig. 6 shows the result of gain in full-wave numerical EM simulator software HFSS and CST simulators with the gain of antenna between 2-7 dB. In spite of having notch bands in the antenna impedance bandwidth, the corresponding gains are relatively high.

V. Conclusion This paper presents a novel band-notched circular CPW antenna for ultrawideband (UWB) communication in WiFi and WiMAX applications. This antenna is designed for the range of 3.110.6 GHz and added some lower frequencies to this band by novel notch method. This paper applies band-notched antenna method in order to design two lower frequencies in antenna at 2 GHz and 2.4 GHz. These frequencies are applied for DCS, PCS, UMTS, wireless

applications and at IEEE 802.11b with 17.5% and 6.5% bandwidths. In addition, it investigates the effect of the slot and bottom metallic ring on the antenna and the effect of their combination simultaneously.

Acknowledgment The authors have special thanks to Faculty of Micro-

Electronic for financial support.

References

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