Antenna For Ultra-wideband Applications Research Articles

Frequency and Time Domain Characterization of a Novel Hexagonal-shaped Microstrip Antenna for Ultra Wideband Applications

This paper presents frequency- and time-domain characterization of a new hexagonal-shaped monopole antenna with small slots for ultra-wideband (UWB) applications. The antenna was simulated using commercial software tools (CST) microwave studio and Agilent ADS. Neltec make a soft substrate having a dielectric constant of 2.2 and a board thickness of 0.254 mm (10 mil) was used to fabricate the proposed antenna. Frequency-domain characterization using an automatic network analyzer showed return loss less than -10 dB over the entire UWB frequency band. To study the effect of various parameters on the antenna performance, the detailed parametric study was carried out. The radiation patterns and group delay characteristics were measured in an anechoic chamber. Using an Agilent DSO9000A oscilloscope, time-domain characterization of the antenna was carried out. The simulated and measured results in the time domain showed good agreement. It was observed that the proposed antenna shows reasonably good frequency characteristics and time-domain pulse distortion is small indicating usefulness of the antenna for UWB communication applications.

Small Square Monopole Antenna With Enhanced Bandwidth by Using Inverted T-Shaped Slot and Conductor-Backed Plane

We present a novel printed monopole antenna for ultra wideband applications. The proposed antenna consists of a square radiating patch with an inverted T-shaped slot and a ground plane with an inverted T-shaped conductor-backed plane, which provides a wide usable fractional bandwidth of more than 130% (2.91-14.1 GHz). By cutting a modified inverted T-shaped slot with variable dimensions on the radiating patch and also by inserting an inverted T-shaped conductor-backed plane, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The designed antenna has a small size of 12 × 18 mm2 . Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.

Compact ultra‐wideband antennas with single band‐notched characteristic using simple ground stubs

AbstractIn this article, a compact planar monopole antenna for ultra‐wideband applications with band‐notched characteristic is presented. The antenna with a small size of 30 mm × 39.3 mm operates from 2.57 to over 12 GHz with return loss larger than 10 dB and the radiation patterns similar to that of dipole antennas. A pair of ground stubs locating along the edge of the ground plane is used to create the band‐notch characteristic. The band notch covers the wireless area network band from 5.15 to 5.825 GHz. The center‐notch frequency and notch bandwidth can be adjusted using the dimensions of the ground stubs. Prototype of the proposed antenna is designed, fabricated, and studied. The band‐notched characteristics, return loss, radiation patterns, peak gains, and efficiencies of the antenna are studied using both computer simulation and measurements. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:523–529, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25817

Candelabra shaped microstrip antenna for ultra-wideband applications

This article presents the results of a novel and compact microstrip antenna having a candelabra geometry, which exhibits ultra-wideband (UWB) performance when excited using coplanar waveguide feed. The proposed antenna exhibits an impedance bandwidth of 138% from 2.3 to 12.7 GHz, exceeding Federal Communication Commission's ultra-wideband frequency range with a return-loss performance S11 = −10 dB. The antenna radiates omnidirectionally in the H-plane and bidirectionally in E-plane. Details of the antenna's design and simulation results are presented and validated with practical measurements. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:669–672, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25783

A novel monopole antenna for ultra-wide band application

A novel ultra-wideband monopole antenna is presented in this article. The radiation element of the proposed antenna is composed of dual-ring connected by several metallic via holes. The structure of the radiating ground is a rectangle with two rounding chamfers. They are printed on the substrate with dielectric permittivity of 2.65. Radiation characteristics of the proposed antenna are studied. The results show that the proposed antenna has favorable ultra-wide band-related performances. The proposed antenna serves as a good candidate for the future design of ultra-wide band antennas. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2694–2696, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25558

A CPW-Fed Printed Loop Antenna for Ultra-Wideband Applications, and its Linear-Array Performance

A small CPW-fed loop antenna is described. The single antenna has a measured relative impedance bandwidth of 70%. Radiation patterns show stable co-polar and low cross-polar characteristics within the specified bandwidth. The small size of the radiator (0.5λ at 13.6 GHz) makes it suitable for being used in linear-array applications. The linear-array performance of the antenna is investigated by means of simulations and measurements. The mutual coupling in the array environment is reduced by means of slots placed on the antenna's surface. The impedance bandwidth is almost preserved after the antennas are embedded in an array environment. The radiation patterns of the array is also investigated by means of simulations and measurements.

Dielectric‐EBG covered conical antenna for UWB applications

PurposeThe purpose of this paper is to investigate of the ultra‐wide band (UWB) characteristics of a conical antenna covered by an electromagnetic band‐gap (EBG) structure composed of alternating high‐ and low‐permittivity dielectric spherical shells.Design/methodology/approachA finite difference time domain in spherical coordinates is implemented in order to characterize the antenna's performance and waveform fidelity in case an UWB pulse is used. The method of projected effective permittivity is used in order to treat accurately the dielectric interfaces between the dissimilar spherical shells.FindingsThe design achieves a very wide impedance bandwidth above 5.5 GHz and presents UWB radiation characteristics and high average gain over the whole bandwidth. The radiation patterns are monopole‐like and their frequency dependence is small in the whole UWB frequency band. A time domain study has shown that the antenna distorts the excitation pulse in a moderate way.Originality/valueIn this paper, a quasi‐planar wideband conical antenna coated on a dielectric EBG structure is proposed for what is believed to be the first time. It is mechanically stable and, relatively easy to build and integrate with the planar circuits.

A novel folded slot antenna for UWB applications

AbstractThis letter presents a compact and novel folded antenna with curved slots for ultra‐wideband (UWB) applications.The proposed antenna originates from an antenna, which consists of a pair of symmetrically curved radiating slots fed by a CPW transmission line. This pair of planar curved slots is symmetrically folded in relation to the central feeding lines so that the size is shrunk to one half of the original geometric size. Using the HFSS software, the simulated results shows that the folded type antenna still preserves the UWB transmission characteristics. The impedance bandwidth, radiation pattern, and radiation gains of this shrunken UWB antenna are investigated and further measurement are performed to verify its UWB characteristics. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1872–1877, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25299

Small microstrip‐fed printed monopole antenna for UWB application

AbstractIn this article by using the Babinet's Equivalence Principle and self‐complementary structure, we present a novel printed monopole antenna for ultra‐wideband (UWB) applications. The proposed antenna consists of a ground plane and radiating patch with a slot and a sleeve structure, which provides fractional bandwidth of more than 100%. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1756–1761, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25318

ULTRA-WIDEBAND SMALL SQUARE MONOPOLE ANTENNA WITH VARIABLE FREQUENCY BAND-NOTCH FUNCTION

In this paper, a novel printed monopole antenna for ultra wideband applications with variable frequency band-notch characteristic is presented. The proposed antenna consists of a stepped square radiating patch with modifled W-shaped slot and a ground plane with rectangular sleeve and pair of L-shaped resonator which provides a wide usable fractional bandwidth of more than 130% (3.05{14.3GHz). By cutting a modifled W-shaped slot with variable dimensions on the radiating patch frequency band-stop performance is generated and we can control its characteristics such as band-notch frequency and its bandwidth. The designed antenna has a small size of 12 £ 18mm 2 while showing the band rejection performance in the frequency band of 5.08 to 5.91GHz.

A Compact Open Slot Antenna for UWB Applications with Band-Notched Characteristic

A compact open slot antenna for ultra-wideband (UWB) applications with band-notched function is presented and investigated. To achieve partial band cutoff, two symmetrical slits are used. Ultra wideband performance is obtained by introducing a stepped strip. A prototype of the proposed antenna is fabricated and its performance is simulated and measured. The measured results show that the antenna of 26.5 mm× 12 mm × 1.5 mm dimensions sufficiently covers the band of UWB from 2.95 GHz to more than 12 GHz excluding the rejection band from 5.1 GHz to 6.0 GHz. The antenna also shows stable gain and constant group delay across the UWB band.

A Novel Band-Notched Planar Monopole Antenna for Ultrawideband Applications

In this letter, a novel planar monopole antenna with a variable frequency band-notch characteristic for ultrawideband (UWB) applications is presented. The UWB property is achieved by embedding two shorted rectangular quarter-wavelength resonators. Two other L-shaped quarter-wavelength resonators coupled to the radiating patch are also used in order to generate the frequency band-stop performance and control antenna characteristics such as band-notch frequency and its bandwidth. The designed antenna has a stopband of 5-5.9 GHz while maintaining wideband performance from 3.1 to 11 GHz with VSWR <; 2.

A miniaturised monopole antenna for ultra-wide band applications with band-notch filter

This study presents a new miniaturised printed monopole antenna. The size of the antenna is 18times18 mm 2 . First simple design rules are given to arrive at an initial design for the antenna, then the antenna parameters are optimised for utilisation in ultra wide band (UWB) applications. The performance parameters like voltage standing wave ratio (VSWR) of the single antenna as well as transmission function, group delay and the fidelity factor of a two-antenna system are calculated and measured. It is shown that the band-notched performance can be obtained from the designed antenna by introducing simple pi-shape or V-shape slots in its radiating element. Good agreements between simulated and measured results are observed.

CPW-Fed Quasi-Magnetic Printed Antenna for Ultra-Wideband Applications

An optimized coplanar waveguide fed quasimagnetic printed antenna for ultra wideband applications is described. A parameter study, motivated by a design procedure, allowed a substantial increase in the return-loss operational bandwidth. The numerically predicted performance was validated by means of physical measurements of fabricated samples. The measured radiation patterns of the antenna demonstrated its adequate radiation characteristics. The feed radiation was also investigated by means of physical measurements.

Ultra wideband patch antenna with a novel folded-patch technique

The authors present the results of a polygonal patch antenna for ultra-wideband applications covering a frequency band from 4.14 to 13.50 GHz. The fabricated antenna achieved a 10 dB impedance bandwidth in excess of 125 with an antenna size of 0.373lambda o times0.373lambda o times0.149lambda o at its centre frequency. The antenna's impedance bandwidth is 64% higher than what is currently obtainable with state-of-the-art folded-patch techniques. The proposed patch antenna has a polygonal-shape with a rectangular slot and shorting pins. The analysis of this antenna shows that bandwidth broadening is achieved by using a rectangular slot on the patch that is fed from a folded-patch feed, whereas the reduction in antenna size is achieved through the use of two shorting pins strategically located on the radiating patch.

A Novel Modified Head-Shaped Monopole Antenna for UWB Applications

This paper proposes a new monopole antenna for ultrawideband (UWB) applications. The frequency band is considered 3.1–10.6 GHz, which has been approved by the Federal Communications Commission (FCC) as a commercial UWB band. The proposed antenna has a small size of 33 × 33 mm2 fed by a microstrip line and provides an impedance bandwidth as high as 120% (3 GHz–12 GHz) at a center frequency of 7.5 GHz for S 11 < −10 dB. The impedance bandwidth of the antenna is improved by creating two circular slots in patch of monopole antenna. Various mobile communication services such as WLAN (5 GHz), WIMAX (3.4 GHz), and UWB can be easily covered by the proposed antenna simultaneously.

Compact Double-fed Dual Annular Ring Printed Monopole Antenna for UWB Application

In this paper, we present a novel type of annular ring Printed Monopole Antenna (PMA) for ultra wideband (UWB) applications. The proposed antenna consists of a truncated ground plane and radiating patch with dual annular structure, which provides a wide usable bandwidth with high radiation pattern stability. Moreover, the effects of a double-fed structure inserted in the radiating patch, on the impedance matching and radiation behavior is investigated. Its impedance bandwidth, defined by measured voltage standing wave ratio (VSWR) less than 2, is from 3.1 to 16 GHz with a ratio of about 5.15 : 1. This novel monopole antenna has ultrawide impedance bandwidth, compact size (18 mm × 14 mm), low fabrication lost, and omni-directional H-plane radiation patterns, which are suitable for various broadband applications.

A Compact Band-Notched Slot Antenna for UWB Applications

A compact planar ultra-wideband (UWB) slot antenna with band-notch function is proposed in this paper. With a horn-shaped radiation slot fed by a microstrip line with a T-shaped stub, the design has a compact size of 22 × 27 mm2. The band-notch function is realized by a half-wavelength rectangular split ring slit (SRS) embedded in the stub. The impedance bandwidth (VSWR < 2) of the antenna is 3.0 ∼ 12 GHz (120%) with a notched band from 4.9 to 5.9 GHz, which covers the WLAN band. The proposed antenna has a fairly good omni-derectional radiation pattern. The performance of the proposed antenna is confirmed by simulation and measurement results, which show that the design is suitable for UWB applications.

Printed Monopole Antenna with a Novel Band-Notched Folded Trapezoid for Ultra-wideband Applications

In this paper, we propose a new band-notched tapered monopole antenna for ultra-wideband applications. The antenna structure is etched on a 1 mm-FR4 epoxy substrate with dielectric constant εr = 4.4. The ground plane and radiating patch are tapered to obtain good wide impedance matching performance. Inserting two slots in the ground plane causes to greatly widen the impedance bandwidth. By embedding a folded trapezoid in an inner hole of the patch, the band-notch function can be achieved. The fabricated antenna has a small size of 18 mm × 20 mm and operates over the frequency band between 3 to 13 GHz for VSWR < 2, rejecting the undesired frequency band from 5.1 to 5.85 GHz.

CPW-fed crescent patch antenna for UWB applications

A novel printed antenna for ultra-wideband (UWB) applications is presented. The antenna consists of an open annulus strip as a ground plane and an open crescent patch in the inner space of the annulus as a radiating element. The antenna is fed by a coplanar waveguide with a central strip connected to the crescent patch. The antenna has a compact structure, and the total size is 33×30×1.57 mm. A relative impedance bandwidth of 129% is achieved, which covers 3–14 GHz.