Dual Band-notched Characteristics Research Articles

Trapezoid UWB antenna with dual band‐notched characteristics for WiMAX/WLAN bands

A trapezoid monopole antenna with dual band-notched characteristics for UWB is presented. The antenna consists of a trapezoid patch and a rectangular ground plane. To realise dual notched-band characteristics, a U-shaped stub and a T-shaped stub are embedded in two trapezoid slots of the radiation patch, respectively. The measured results show that the proposed dual notched-bands planar has an impedance bandwidth of 3-11 GHz for VSWR <; 2, except two frequency notched bands of 3.3-3.7 GHz (WiMAX band) and 5.15-5.825 GHz (WLAN band). Both the measured and simulated results of the proposed antenna are presented, indicating that the antenna is a good candidate for UWB applications.

Dual-band notched ultra-wideband antenna by using step-by-step design inside conductor-backed plane

A coplanar waveguide fed (CPW-fed) ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the compact dimensions and band-notched characteristics that are achieved without modifying the radiator or the CPW-ground plane. Dual band-notched characteristics are achieved by M-shaped strip inside the slotted conductor-backed plane. Also, wider impedance bandwidth can be achieved with this structure. The measured results show that the proposed antenna operates over the frequency band between 2.6 GHz and 11.7 GHz (127%), defined by VSWR < 2, except two notched bands (3.25–4.32 GHz and 5.02–5.97 GHz), where the VSWR is more than eight, aimed at suppressing any interference from IEEE802.16 WiMAX (3.3–3.6 GHz), C-band (3.7–4.2 GHz), and IEEE802.11a WLAN (5.15–5.825 GHz). The designed antenna has a small size of 15 × 15 mm2. The antenna has a desirable VSWR level, radiation pattern and gain characteristics for ultra-wideband frequency band range. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1069–1074, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27512

Simple notches design for ultra-wideband monopole antennas with coplanar-waveguide-coupled-fed

In this article, the design of a ultra-wideband (UWB) monopole antenna with coplanar-waveguide (CPW)-coupled-fed is presented. The antenna is composed of a trapezium patch with a CPW-fed printed on one side of the substrate and an elliptical radiator on the other side. By simply cutting slits on the radiation patch, a single, dual, and triple band notched characteristics can be achieved. Parametric studies on the antenna and slits are carried out by computer simulation. Results show that the notch frequencies can be set by using dimensions of the slits. The antennas are designed and optimized using computer simulation. For verification, the antennas with single and dual band-notched characteristics are fabricated and measured. The simulated and measured results on the return loss, radiation pattern, peak gain, and efficiency of the antenna are presented. Due to the small ground-plane size of the antenna, the feeding cable used in the measurement equipment significantly affects the measured results and leads to large discrepancies between the simulated and measured results at low frequencies. To study this, the simulation model of the feeding cable is also used in simulation and results show that the discrepancies are substantially reduced. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1017–1027, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27530

A compact CPW-FED UWB antenna with independent dual band-notched characteristics

In this article, a new design of a coplanar waveguide fed (CPW-fed) ultra-wideband (UWB) antenna with dual band-notched characteristics is presented. To achieve ultra-wideband impedance matching, the tapered geometry is adopted. The two meandered split resonant slots that are etched on this antenna are to reduce the possible interferences with the band of 3.2–3.8 GHz and 5.1–5.8 GHz, which cover both WLAN and WiMAX. The upper slot (shorter in length) controls the higher band, while the lower one (longer in length) controls the lower band. Antennas with and without slots are analyzed and compared, which indicates the ability of two incorporated slots to tune the notch-band independently. A prototype is fabricated and measured, and the good agreement between simulated and measured results manifests the effectiveness of this design. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1126–1130, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27519

Printed planar UWB antenna with rejection of WLAN and WiMAX bands

A novel ultra-wide band planar antenna with dual band-notched characteristics is presented in this article.The antenna has compact size of 23 × 28 × 0.8 mm3 and it consists of novel patch. The measured antenna has impedance bandwidth of 3–10.7 GHz with dual notched bands of 3.3–3.7 GHz and 5.1–5.9 GHz to avoid interference from WiMAX and WLAN bands, respectively. A set of spiral slots and novel pulse-shaped slots are etched in ground plane to obtain the dual notched bands. The effects of different geometrical parameters on various characteristics of antenna are investigated. The proposed antenna has consistent gain and stable radiation pattern. The measured group delay indicates that the antenna has good time domain response.© 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:740–744, 2013; View this article online at wileyonlinelibrary.com. DOI: 10.1002/mop.27461

Design and analysis of compact printed dual band-notched ultrawideband (UWB) antenna

A compact printed ultrawideband (UWB) antenna with dual band-notched characteristics is proposed for UWB integration communication system. The presented design, having a total size of 30 × 25 mm, consists of a folded fork-shaped radiator fed by a microstrip line and a modified ground plane with trapezoid-shaped slots on its top edge, which can effectively increase the bandwidth of the proposed antenna. To avoid potential interferences, a straight, open-ended quarter-wavelength slot and a semicircular half-wavelength slot are etched in the radiating patch to generate dual notched bands in 3.3–3.6 GHz for WiMAX and 5.15–5.825 GHz for WLAN. Lumped-element equivalent circuit model is carried out to comprehend and predict the dual band-notched properties. Good agreement is achieved between the simulation and measurement, which shows that the proposed antenna provides an impedance bandwidth of more than 145% between 2.7 and 17 GHz, two independently controllable notched bands and good omnidirectional radiation patterns.

Compact Printed Wide-Slot UWB Antenna With 3.5/5.5-GHz Dual Band-Notched Characteristics

A novel compact wide-slot ultrawideband (UWB) antenna with dual band-notched characteristics is presented. The antenna consists of an inverted U-shaped slot on the ground plane and a radiation patch similar to the slot that is fed by a 50-Ω microstrip line. By etching a C-shaped slot on the radiation patch and extruding an L-shaped stub from the ground plane, dual band-notched properties in the WiMAX (3.4-3.69 GHz) and WLAN (5.15-5.825 GHz) are achieved. The proposed antenna has a compact size of 20×27 mm2 and operates from 2.89 to 11.52 GHz. Furthermore, nearly omnidirectional radiation patterns and constant gain are obtained in the working band.

A Compact CPW-Fed UWB Antenna with Dual Band-Notched Characteristics

A compact CPW-fed planar UWB antenna with dual band-notched property is presented. The dual band rejection is achieved by etching a C-shaped slot on the radiation patch and two L-shaped parasitic strips in the ground plane. The experimental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultrawideband frequency range from 2.4 to 12.5 GHz with VSWR less than 2, except for two stopbands at 3.3 to 3.75 GHz and 5.07 to 5.83 GHz for filtering the WiMAX and WLAN signals, respectively. It also demonstrates a nearly omnidirectional radiation pattern. The fabricated antenna has a tiny size, only 32 mm × 32 mm × 0.508 mm. The simulated results are compared with the measured performance and show good agreement. The simple structure, compact size, and good characteristics make the proposed antenna an excellent candidate for UWB applications.

A Novel Printed UWB Slot Antenna With Reconfigurable Band-Notch Characteristics

A novel printed ultrawideband (UWB) slot antenna with reconfigurable band-notch characteristics is presented in this letter. The proposed antenna consists of a modified rectangular radiation patch with a circular and three rectangular-shaped slots etched on it. Additionally, by cutting two triangular-shaped slits on a modified ground plane, practical fractional bandwidth of more than 120% (3.12-12.51 GHz), defined by -10 dB return loss, is achieved. In order to generate single and dual band-notch characteristics, two p-i-n diodes are mounted across the circular slot. The designed antenna has small size of 20 × 20 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> with switchable single notched bands of 3.12-3.84 GHz WiMAX and 5-6.07 GHz WLAN, when diode 1 and diode 2 are respectively on. Also, dual bands of 3.12-3.82 and 4.9-6.06 GHz are eliminated from whole frequency band when both diodes are concurrently on.

Design of UWB Monopole Antenna with Dual Notched Bands Using One Modified Electromagnetic‐Bandgap Structure

A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.1–10.6 GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5 GHz and 5.5 GHz, respectively.

Dual Band-Notched Small Monopole Antenna With Novel Coupled Inverted U-Ring Strip and Novel Fork-Shaped Slit for UWB Applications

This letter proposes a novel, small, printed monopole antenna for ultrawideband (UWB) applications with dual band-notch function. By cutting an inverted fork-shaped slit in the ground plane, additional resonance is excited, and hence much wider impedance bandwidth can be produced. To generate dual band-notch characteristics, we use a coupled inverted U-ring strip in the radiating patch. The measured results reveal that the presented dual band-notch monopole antenna offers a wide bandwidth with two notched bands, covering all the 5.2/5.8-GHz WLAN, 3.5/5.5-GHz WiMAX, and 4-GHz C-bands. The proposed antenna has a small size of 12 × 18 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> or about 0.15 λ × 0.25 λ at 4.2 GHz (first resonance frequency), which has a size reduction of 28% with respect to the previous similar antenna. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure UWB applications.

Planar ultrawideband fractal antenna with 3.4/5.5 GHz dual band-notched characteristics

A simple and compact coplanar waveguide (CPW)–fed ultra wideband (UWB) antenna is presented. The proposed antenna consists of a circular patch with triangular slot, which is etched onto FR4 Printed Circuit Board (PCB) with overall size of 39.2 × 43.5 × 1.6 mm³. The simulated and measurement results shown that the antenna achieves good impedance matching, consistent gain and stable radiation patterns. Extended UWB antenna with notch band (3.3–3.6 GHz & 5–6 GHz) design are also presented as a desirable feature for UWB application.

A DESIGN OF MINIATURIZED ULTRA–WIDEBAND PRINTED SLOT ANTENNA WITH 3.5/5.5 GHZ DUAL BAND–NOTCHED CHARACTERISTICS: ANALYSIS AND IMPLEMENTATION

A design and analysis of a novel proximity-fed printed slot antenna with 3.5/5.5GHz dual band-notched characteristics are presented. To obtain an ultra-wideband (UWB) response, a circular patch with a rectangular conjunction arm is etched concentrically inside a ground plane aperture. The antenna is proximity-fed by a microstrip line with an open shunt stub on the other side of the substrate. The designed antenna satisfles a i10dB return loss requirement in the frequency band from 2.7 to 17GHz. In order to obtain dual band-notched properties at 3.5 and 5.5GHz, an open ring slot is etched ofi the circular patch and a …-shaped slot is etched ofi the microstrip feeding line, respectively. A curve fltting formulation is obtained to describe the in∞uences of the notched resonators on the corresponding notched frequencies. The proposed antenna is designed, simulated and fabricated. The measured data show a good agreement with the simulated results and the equivalent circuit results through the use of a modifled Vector Fitting technique for a rational function approximation. The proposed antenna provides almost omnidirectional radiation patterns, relatively ∞at gain and high radiation e-ciency over the entire UWB frequency excluding the two rejected bands.

Compact ultra-wideband CPW-fed fan-shaped antenna with dual band-notched characteristics using ARC-shaped slots

In this article, a compact coplanar waveguide-fed fan-shaped monopole antenna for ultra-wideband applications with dual band-notched characteristics is proposed and studied. The antenna with fan-shaped structure occupies a small size of 35 × 30 mm2. With a pair of arc-shaped slots introduced on the radiating patch, two frequency-notched responses at 3.5/5.5 GHz are obtained. The antenna structure is designed, fabricated, and tested. The band-notched characteristics, VSWR, radiation patterns, gains within the operating band have been observed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:368–371, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27328

Planar UWB monopole antenna with dual band-notched characteristics for UWB applications

A simple and compact circular ultra-wideband (UWB) planar monopole antenna with dual band-notched characteristics is presented. By inserting a pair of two slots in the ground plane as well as adding a pair of arc-shaped parasitic strips around the radiating element, two notched frequency bands in the WiMAX/WLAN are achieved. Experimental results show a VSWR<2 bandwidth of 7.6 GHz for nondefected antenna and two highly rejected bands in the frequency region of 3.3–3.7GHz and 5–6GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:241–245, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27301

Design of an integrated UWB antenna with dual band notch characteristics

A miniaturized couple-line-fed planar ultra-wideband (UWB) antenna is proposed, which has a dual band-notched characteristic as well as two integrated monopoles. Narrowband notches are generated at frequencies of 3.5GHz and 5.5GHz using independently controlled bent resonators, whereas the monopoles are designed for radiation at 900MHz and 2.4GHz. The proposed design is simulated with full wave solvers and verified with measurements. A good agreement is observed between the simulations and measurements for the antenna's return loss, gain and radiation pattern performances.

A planar circular ring ultra-wideband antenna with dual band-notched characteristics

A compact planar monopole ultra-wideband (UWB) antenna with dual band-notched characteristics is proposed in order to minimize the interference between UWB systems and existing world interoperability for microwave access and wireless local area network operating bands. The antenna has a microstrip line-fed circular ring radiator with one etched partial concentric annular slot and one semi-circular slot. Two rectangular slots are also etched to connect the slots to the outer and inner periphery of the circular ring radiator. The desired dual band-notched UWB operation can be obtained by choosing the size and location of the etched slots. Experimental results show that with a compact size of 24 mm × 26 mm the proposed antenna achieves a wide impedance bandwidth from 2.79 to more than 11 GHz with two frequency notched bands of 3.3–3.8 and 5.1–6 GHz for WiMAX and WLAN, respectively. Moreover, the antenna exhibits stable radiation characteristics and a good time domain behavior which makes it suitable for being used in the future UWB applications.

Design and Optimization of Integrated Bluetooth and UWB Antenna With Dual Band-Notched Functions

A compact microstrip-fed printed planar integrated Bluetooth and ultra wideband (UWB) monopole antenna with dual band-notched characteristics in the 3.5 GHz WiMAX and 5.2/5.8GHz WLAN band is presented. The proposed antenna design consists of the semicircular ring patch and partial ground plane. The extra band (2.33-2.5GHz)for Bluetooth is obtained by adding the T-shaped strip at the top of the patch. Additionally, two L-shaped arc slots in patch and two U-shaped circular slots in partial ground plane are etched to reject the WiMAX and WLAN bands. The numerical and experimental results show that the proposed antenna has an impedance bandwidth of VSWR ≤ 2 from 2.33 GHz to 2.5 GHz for Bluetooth band and 3.04 GHz to 10.8 GHz for UWB band except the notch band frequencies 3.34.1 GHz for WiMAX and 5 – 5.9 GHz for WLAN band.

Design of a novel ultrawideband antenna with dual band-notched characteristics

A simple printed ultrawideband (UWB) antenna with reconfigurable band-rejected characteristics is proposed. The antenna was fabricated on an FR-4 epoxy substrate and has a volume of 40.0 × 32.0 × 1.0 mm3. The simulated and measured results show that the antenna has nearly omnidirectional patterns, stable gain, and an available impedance bandwidth of 9.38 GHz which covers 2.34–11.72 GHz. By etching two slots in the radiator, band- notched features centered at 3.5 and 5.5GHz are achieved. With adding two microelectromechanical system switches across slots, the band-rejected characteristics can be reconfigurable and the proposed antenna is capable of operating among none or single or dual band-notched modes. Meanwhile, to discuss the mechanisms of the band-rejected properties, the conceptual equivalent circuit models are presented. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2401–2405, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27061

A quasisemicircular wide-slot antenna with 3.5-/5.5-GHz dual band-notched characteristics for ultrawideband applications

A novel ultrawideband (UWB) wide-slot antenna with dual-notched bands is presented and investigated in this article. The radiator is a quasisemicircular slot excited by a fork-shaped stub. By introducing an arc-shaped slot and a pair of arc-shaped strips on the ground, the 3.5- and 5.5-GHz dual band-rejected filtering properties for worldwide interoperability for microwave access and wireless local area network signals can be achieved well. Measured results demonstrate that the proposed antenna can operate well over UWB frequency band ranging from 2.85 to over 12 GHz, while providing dual-notched bands (VSWR > 2) covering 3.23–3.71 GHz and 5.03–6.34 GHz. In addition, nearly omnidirectional radiation patterns, stable gain, and moderate group delay variation can also be observed in the operating bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1602–1605, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26901