Compact Band-notched Ultra-wideband Antenna Research Articles

Compact band-notched UWB antenna for MIMO applications in portable wireless devices

A compact 5.5 GHz band-notched ultra-wideband (UWB) 2-element antenna with high isolation for multiple-input multiple-output (MIMO) portable wireless devices in wireless personal area network (WPAN) application is proposed. The MIMO antenna is designed for 3.1–10.6 GHz range on Neltec substrate with compact dimension of 43 × 20 mm2 and is tested experimentally. For the rejection band at 5.5 GHz, a slot of length 1.0 λ is etched into the radiator. Simple structure, i.e., receded steps at ground are used to improve isolation by 3 dB between two UWB antennas. The simulated and measured results show |S11| ≤ −10 dB and |S21| ≤ −20 dB in most of the frequency range excluding the reject band at 5.5 GHz in UWB range. The measured, simulated and calculated results show that the proposed UWB MIMO antenna is a good candidate for UWB MIMO systems. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1390–1394, 2016

Compact Band-notched UWB Antenna Design Based On Transmission Line Model

In order to avoid the interference from existing narrowband communication systems, this paper proposes a compact band-notched UWB (ultra wideband) antenna with size of 12mm×22mm ×1.6mm. Transmission line model is applied to analyzing wide impedance matching characteristic of the modified base antenna, which has a gradual stepped impedance feeder structure. The proposed antenna realizes dual band-notched function by combining two biased T-shaped parasitic elements on the rear side with a window aperture on the radiation patch. The simulation current distributions of the antenna reflect resonant suppression validity of the two methods. In addition, the measured radiation characteristics demonstrate the proposed antenna prevents signal interference from WLAN (5.15- 5.825GHz) and WiMAX (3.4-3.69GHz) effectively, and the measured patterns show the antenna omnidirectional radiation in working frequencies.

Compact band notched ultra‐wideband antenna using the Hilbert‐curve slot

AbstractA compact band notched ultra‐wideband (UWB) antenna with the Hilbert‐curve slot (HCS) is proposed. By introducing the HCS on the UWB antenna, a compact size and the frequency notch function can be simultaneously obtained. On imprinting the HCS on the UWB antenna, the notched 5 GHz wireless local area network (WLAN) band was realized. As for the HCS implementation, we make use of the third iteration order Hilbert‐curve. Numerical simulations and measurements for the proposed antenna demonstrate that the presented methodology is accurate and efficient to design the compact band notched UWB antenna. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2642–2648, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26348

A Compact Band-Notched UWB Antenna with Controllable Notched Bandwidths by Using Coupled Slots

A compact coplanar waveguide fed (CPW-FED) ultrawideband (UWB) antenna with controllable notched bandwidths for WLAN bands ranging from 5.3 GHz to 5.7 GHz is proposed and implemented. The proposed antenna consists of part of a circular patch and two modified ground planes. Two upper half-wavelength C-shaped slots and another lower half-wavelength C-shaped slot are coupled separately to form a band rejection. The simulation and measurement show that the proposed antenna achieves a well-matched broadband impedance of 3.1–10.6 GHz (|S11| < –10 dB), except the rejection bandwidths of 5.3–5.7 GHz for the centre band of WLAN (|S11| > –5 dB). Moreover, the notched bandwidths can be controlled by adjusting the coupling distances of the corresponding slots. The antenna is successfully designed, simulated and measured with broadband matched impedance and near omnidirectional radiation patterns.

A Compact Band Notched UWB Antenna for Mobile Applications

In this paper, a compact circular UWB (ultra-wideband) antenna with WLAN 802.11a/n band (5.15»5.825GHz) rejection characteristic is proposed for the mobile applications. The proposed UWB antenna was compact enough to be loaded into a mobile handset. The performance of the suggested antenna is mostly dependent on the gap between circular radiator and the ground plane. In order to have the band notched operation, the CSRR (complementary split ring resonator) is etched inside the circular patch of the UWB antenna. MWS (Microwave Studio) of CST company was utilized in the design stage. The antenna was constructed on a substrate, Rogers 4003, with the thickness of 0.8mm and relative permittivity of 3.38. A size of substrate is 24£37.5mm 2 and a radius of circular radiator is 5mm long. The proposed antenna covers the frequency band from 3.2 to 10.6GHz (S11 • 10dB), and the band rejection occurs about 5.7GHz band. A simulation shows the maximum gain of 5.2dBi, and radiation pattern is nearly omni-directional over the entire i10dB return loss bandwidth. It also represents the group delay below 1nsec over UWB communication band (3.2GHz»10.6GHz) except WLAN band. Based on the experimental results, the proposed antenna could be a good candidate for the handheld mobile handsets.

A Compact Band-Notched UWB Antenna Optimized by a Novel Self-Adaptive Differential Evolution Algorithm

In this paper, a compact ultra-wideband (UWB) antenna with a WLAN band-notched characteristic is presented. The design technique is based on a novel self-adaptive Differential Evolution (DE) algorithm namely ISADE (improved self-adaptive Differential Evolution algorithm). In order to evaluate the algorithm's performance, we tested it on nine most commonly used benchmark functions. Experimental results have shown that the proposed algorithm outperforms the classical DE and at least is comparable to some other adaptive DE algorithms. The optimized UWB antenna has a compact size of 14 mm × 30 mm and is fabricated and measured. Measured results have shown that the antenna has approximately omnidirectional radiation patterns with a good band-notched performance in the WLAN band. Therefore, the results indicate the advantages of this approach and the applicability of the proposed algorithm to other optimization problems in electromagnetics.

Compact band‐notched ultra‐wideband antenna using defected ground structure

AbstractA compact printed monopole ultra‐wideband (UWB) antenna with the band‐notched function is proposed. The antenna consists of a fan‐shaped metal patch and a trapeziform ground with a 50 Ω tapered coplanar waveguide (CPW) transmission line. By simply adjusting the length of the U‐shaped defected ground structure (DGS) in the ground plane, the band‐rejected filtering properties for the WLAN band is achieved. The proposed antenna is successfully simulated, designed, and measured, which shows an ultra‐wide matched impedance band from 3 to 15 GHz for VSWR ≤2 with a stop‐band of 5–6 GHz. The stable radiation patterns are also obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 286–289, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24946

Compact band-notched ultra-wideband antenna with parasitic elements

A compact band-notched ultra-wideband antenna with parasitic elements having small dimensions (12.7×21.6×1.6 mm) is proposed. With the use of a modified half-circular patch and half-wavelength parasitic lines, the proposed antenna has very wide impedance bandwidth measured at 8.6 GHz. By placing a parasitic loop, a band-notched frequency of 5.16 to 5.98 GHz is achieved. The group delay and transmission loss are measured and discussed.

Compact band-notched ultra-wideband antenna

A novel band-notched ultra-wideband antenna having small dimensions (12.7 times 22 times 1.6 mm) is proposed. With the use of a modified ground plane, a microstrip feed with bevel, and parallel dual patches, the proposed antenna has very wide impedance bandwidth measured at 8.18 GHz (2.97 to 11.15 GHz, defined by 2:1 VSWR). By inserting slits in the ground plane, a band-notched frequency of 5.12 to 5.88 GHz is achieved. The transmission loss and group delay are measured and discussed.