Notched Ultra-wideband Antenna Research Articles

Design of a Circularly Polarised Dual Band Notched Ultra Wideband Antenna with Fractal DGS for S-Band and C-Band Applications

Design of a Circularly Polarised Dual Band Notched Ultra Wideband Antenna with Fractal DGS for S-Band and C-Band Applications

A low-profile dual port UWB-MIMO/diversity antenna with band rejection ability

A band notched ultra-wideband (UWB) antenna is presented in this article as a good prospect for multiple-input multiple-output (MIMO)/diversity application. The proposed MIMO antenna is constituted of two modified rectangle-shaped patch antenna elements. A stepped stub is extended from the modified ground plane as a decoupling element between the radiators to realize a good isolation level between them. A band rejection response is obtained by connecting an open resonant stub to each of the radiators. The simulated prototype is fabricated and tested for verification. Results reveal that the proposed prototype provides a 10 dB return loss bandwidth from 3.08 to 10.98 GHz with band notch characteristics from 4.98 to 5.96 GHz, and a good port isolation level (S21 ≤ 20). Diversity performances are ensured in terms of total active reflection coefficient, envelope correlation coefficient (<0.013 except notch band), diversity gain (≈9.51 dB), mean effective gain ratio (≈1), and channel capacity loss (≤0.35 bps/HZ except notch band). It evidences that the presented band notched UWB antenna can be a good prospective for MIMO/diversity applications.

Investigation of a reconfigurable dual notched UWB antenna by conceptual circuit model and time-domain characteristics

In this paper, an ultra-wideband (UWB) antenna with reconfigurable performance is proposed. The antenna consists of a Ushaped radiation patch and a ground plane which is symmetric with the edge of the radiation patch. By using two open-ended L-shaped slots (OEL-S) and one U-shaped slot Defected Ground Structure, the dual notched bands at 3.5 GHz for WiMAX and 5.5 GHz for WLAN are obtained. Three switches are embedded in both L-shaped and U-shaped slots in order to achieve four switchable modes by switching them between ON and OFF states. There are three modes that the antenna can be switched in, which are dual, single and no band-notched modes. The measured result illustrates that the operation frequency band is from 2.7 GHz to 12 GHz ( VSWR<2). Moreover, the conceptual circuit model and time-domain characteristics of the antenna are also proposed to investigate the dual band-notched performance. (C) 2017 Wiley Periodicals, Inc.

Design of a compact tuning fork-shaped notched ultrawideband antenna for wireless communication application.

A new compact planar notched ultrawideband (UWB) antenna is designed for wireless communication application. The proposed antenna has a compact size of 0.182λ × 0.228λ × 0.018λ where λ is the wavelength of the lowest operating frequency. The antenna is comprised of rectangular radiating patch, ground plane, and an arc-shaped strip in between radiating patch and feed line. By introducing a new Tuning Fork-shaped notch in the radiating plane, a stopband is obtained. The antenna is tested and measured. The measured result indicated that fabricated antenna has achieved a wide bandwidth of 4.33–13.8 GHz (at −10 dB return loss) with a rejection frequency band of 5.28–6.97 GHz (WiMAX, WLAN, and C-band). The effects of the parameters of the antenna are discussed. The experiment results demonstrate that the proposed antenna can well meet the requirement for the UWB communication in spite of its compactness and small size.

A SIMPLE AND COMPACT PLANAR ULTRA WIDEBAND ANTENNA WITH SINGLE OR DUAL BAND-NOTCHED CHARACTERISTICS

A printed monopole ultra wideband (UWB) antenna with frequency band-notched characteristics is proposed and investigated. The antenna consists of a half-disk shaped structure combined with an inverted isosceles trapezoid structure. To achieve the frequency band notched characteristics, an open-ended thin slit with a length of about one quarter guided wavelength is inserted on the radiator. Multiple slits can be employed to realize multiple frequency band notched characteristics. To validate the concept, two prototypes aredesigned, fabricated and tested. The ¯rst is a single band notched UWB antenna whereas the second is a dual band notched UWB antenna. The simulated and measured results of both antennas are presented shown a reasonable agreement between them. The results also con¯rm the proposed UWB antenna design can achieve superior dual band-notch performance at desired frequency bands. 1

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

Miniaturized Ultra-Wideband Elliptical Monopole Antenna with Wireless Local Area Network Band Rejection Characteristic

This article presents a new frequency band notch ultra-wideband antenna with compact dimensions. It is shown that with a modified ground plane, antenna dimensions can be reduced without affecting the antenna bandwidth. The overall size of the proposed antenna is 13 mm × 22 mm. Experimental and simulated results of the fabricated antenna are presented. The antenna impedance bandwidth covers the entire ultra-wideband bandwidth from 3.1 to 10.6 GHz except the wireless local area network band. The proposed antenna has an omni-directional radiation pattern over the desired bandwidth. Also, the antenna has a good performance in time domain.

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.

Design of the Novel Band Notched UWB Antenna with the Spiral Loop Resonators

In this paper, a novel conflguration of circular ultra-wideband (UWB) antenna with band rejection characteristic is presented. In order to obtain this characteristic, the spiral loop resonators resonating at the rejection frequency are located in both sides of the circular radiating patch. This novel structure provides the band-notched characteristic without the degradation of the UWB antenna performance itself. Furthermore, the notched band can be easily tuned by adjustment of resonator dimension because the size of the spiral loop resonators controls the corresponding resonance frequency. This prototype antenna has been fabricated on a substrate, Rogers 4003, with the thickness of 0.8mm and relative permittivity of 3.38. The fabricated UWB antenna covers the frequency band from 3.1 to 11.23GHz (S11 • i10dB), and the band rejection characteristic appears near at 5.8GHz band to which the wireless LAN service is assigned. And the far-fleld radiation patterns of the proposed antenna show omnidirectional and stable over the whole frequency band, which prospects the deployment in the UWB system. The measured results agree well with the simulation by the Microwave Studio of CST. This novel technique utilizing the spiral loop resonators might be useful to the planar antennas requiring the band rejection characteristics.

Design of a frequency notched UWB antenna using a slot-type SRR

In this paper, we propose a new design for a frequency notched ultra-wideband (UWB) antenna with a coplanar waveguide (CPW) bandstop filter using a slot-type split-ring resonator (STSRR). To notch the wireless local area network (WLAN) frequency band, a STSRR resonant at the unwanted frequency is inserted into the center line of the CPW of the UWB antenna. The characteristics of the antennas such as return loss, VSWR, surface current, group delay and gain are measured to prove the notched function of the proposed antenna. Also, the radiation pattern of the antenna is monopole like. The measured results show that the proposed UWB antenna is a good candidate for UWB applications.

Miniaturized 5.2 GHz notched UWB CPW‐FED antenna using dual reverse split trapezoid slots

AbstractA novel compact 5.2 GHz notched ultra‐wideband (UWB) CPW‐fed monopole antenna using dual reverse split trapezoid slots which has small area of (16 × 17 mm2) is proposed. The designed antenna operates over 3–11 GHz for VSWR ≤ 2 including the WLAN band notched at the vicinity of 5.2 GHz. The dual reverse split trapezoid slots are employed effectively for notching unwanted frequency band such as that for WLAN service, since it can be implemented with a small dimension and in a high Q operation similarly to the conventional strip‐type dual reverse split ring resonator (SRR). Based on the simulated and measured results, a band notched UWB antenna using dual reverse split trapezoid slots is very effective in rejecting unwanted frequency in terms of its selectivity. Good monopole‐like radiation patterns and antenna gains have also been obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 652–655, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23157