Dual Band-notched Characteristics Research Articles

CPW-fed compact thin-film UWB antenna with dual band-notched characteristics

This paper presents a new compact thin-film ultrawideband (UWB) antenna with dual band-notched characteristics. The antenna contains a rectangular slot with a fork-like tuning stub. To achieve the dual band-notched characteristics, narrow and U-shaped slots are inserted on the radiator. This antenna is printed on a Mylar film substrate of 0.3 mm thickness with a dielectric constant of 3.2. The antenna has compact dimensions of 34.5 × 27.3 mm2. It operates in the frequency range 2.9–11.3 GHz with impedance matching covering the entire bandwidth and reasonable radiation properties. It also exhibits dual band-notched characteristics. One of the notched frequencies is in the range 3.3–3.7 GHz (WiMAX band) and the other in the range 5.1–5.8 GHz (WLAN band). The antenna is designed and simulated by using the commercial IE3D software, which is based on the method of moments. The antenna was fabricated and measured using Agilent E363B PNA network analyzers. The characteristics of the fabricated antenna show high correlation with those obtained from the simulation. The results confirm that the proposed antenna can achieve notch performance for WLAN and WiMAX communication systems and is also suitable for various portable UWB applications. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

A novel compact planar ultra-wideband antenna with dual band-notched characteristics

A novel planar ultrawideband monopole antenna with dual notched bands is presented. The antenna mainly consists of a radiation patch and a modified ground plane. To realize dual band-notched characteristics, a U-shaped stub embedded in the rectangular slot of the radiation patch and a novel coupled open-/shorted-circuit stub resonator are used on the backside of the substrate. The bandwidth of the dual notched bands can be controllable by adjusting some key parameters. The simulated and measured results indicate that the proposed antenna offers a very wide bandwidth from 2.6 to 18 GHz with Voltage Standing Wave Ratio (VSWR) < 2, except the dual notched bands of 3.3–3.7 GHz (World Interoperability for Microwave Access [WiMAX]) and 5.15–5.825 GHz (Wireless Local Area Network [WLAN]). Furthermore, good group delay and stable gains can be achieved over the operating frequencies. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:48–55, 2015.

A simple planar monopole UWB slot antenna with dual independently and reconfigurable band-notched characteristics

An extremely simple and compact planar monopole ultrawideband UWB slot antenna with dual band-notched characteristics is proposed. The antenna is composed of a circular radiation patch, a microstrip-fed line, and a partial ground. By etching an arc-shaped slot on the radiation patch and a C-like slot on the feed line, dual notched frequency bands at 3.3-3.7 GHz for WiMAX and 5.15-5.825 GHz for WLAN are achieved. And, the two notched bands can be adjusted independently by varying the length of the slots. Moreover, the band-notched characteristics can be reconfigurable by shorting the corresponding slots. So, the antenna is capable of operating in one of multiple modes which makes it an excellent candidate for UWB applications. Meanwhile, experimental results indicate that the antenna has an available impendence bandwidth from 2.9 to 11 GHz which covers the UWB frequency band, and nearly omnidirectional patterns, stable gains, small group delay in operating band except rejected bands. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:706-712, 2014.

Compact Planar Monopole Antenna with Dual Band Notched Characteristics Using T-Shaped Stub and Rectangular Mushroom Type Electromagnetic Band Gap Structure for UWB and Bluetooth Applications

In this paper, an ultra-wideband (UWB) antenna with dual band-notched characteristics is proposed. The proposed antenna also covers ISM (Industrial, Scientific, and Medical)/Bluetooth band. The antenna consists of a microstrip fed truncated U-shaped patch, T-shaped stub, rectangular mushroom type electromagnetic band gap structures (EBG), and partial ground plane. To mitigate the problem of interference due to standard narrow bands (like wireless interoperability microwave access (WiMAX) and wireless local area network (WLAN)) lie in the range of UWB, dual band notched characteristics is introduced. The WiMAX and WLAN band notched characteristics are realized by introducing a T-shaped stub and rectangular mushroom type EBG structures, respectively. The proposed antenna is printed on a 1.6 mm thick FR4 substrate with relative permittivity $$(\upvarepsilon _{\mathrm{r}})$$ ( ? r ) 4.4 and the size of actual antenna is $$36 \times 40\hbox { mm}^{2}$$ 36 × 40 mm 2 . The measured results shows that the proposed antenna attains a wide impedance bandwidth $$(\hbox {VSWR} \le 2)$$ ( VSWR ≤ 2 ) from 2.35 to 11.6 GHz with dual band notched characteristics from 3.29 to 3.9 GHz and 5.1 to 5.85 GHz with stable radiation patterns. The time domain behaviors of the proposed antenna is also analyzed for pulse handling capability.

Design of Compact Dual Band-Notched UWB Antenna Using Slotted Conductor-Backed Plane

A planar 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 ground plane. The antenna consists of a square patch as radiator, a partial ground plane and a slotted conductor-backed plane. The dual band-notched characteristics are achieved by a U-shaped slot and a pair of mirror inverted L-shaped slots at the conductor-backed plane. By inserting a U-shaped slot with variable dimensions on the conductor-backed plane, additional resonances are excited and hence much wider impedance bandwidth can be obtained, especially at the higher band. The measured results show that the proposed antenna operates over the frequency band between 2.8 and 14.8 GHz (137 %), defined by S11 < − 10 dB, except two notched bands WiMAX (3.3–3.6 GHz) and WLAN (5.15–5.825 GHz). The designed antenna has a small size of \({18 \times 18}\) mm. The antenna has a desirable VSWR level, radiation pattern and gain characteristics for ultra-wideband frequency band range.

Ultra‐wideband tapered patch antenna with fractal slots for dual notch application

ABSTRACTIn this article, the ultra‐wideband tapered patch antenna with fractal slots for dual notch application is presented. The antenna is printed on FR‐4 low‐cost substrate with relative permittivity of 4.4 and thickness of 1.6 mm. Total dimensions of the antenna is 45 × 44 × 1.6 mm3. In here, fractal slots was applied to represent dual notch band characteristics. The final antenna as demonstrated in this article has two rejection bands at 3 and 5 GHz and the antenna covers 2.1–12 GHz frequency band with the VSWR of less than 2. The current distribution in notch frequency and efficiency was checked for the whole frequency band and the maximum antenna gain is between 2 and 6 dBi. Finally, the experimental results are compared with the HFSS simulation ones. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1344–1348, 2014

DESIGN AND ANALYSIS OF TWO NOVEL CPW-FED DUAL BAND-NOTCHED UWB ANTENNAS WITH MODIFIED GROUND STRUCTURES

In this paper, two novel coplanar waveguide (CPW) fed printed ultra wide band (UWB) monopole antennas with dual band-notching characteristics are proposed. The modifled ground technique with symmetric ground plane in antenna 1 and asymmetric ground planes in antenna-2 is exploited to cover UWB application. Both antennas are compact with dimensions of 30£30£1:6mm 3 and have dual band-notched characteristics with flrst notched band for integrated band of WiMax 3.5/5.5GHz and C-band satellite communications 3.7{4.2GHz and second notched band for WLAN 5.2/5.8GHz bands. Antenna with symmetric ground plane achieves the impedance bandwidth of 2.9{11.5GHz, and antenna with asymmetric ground plane achieves the impedance bandwidth of 2.9{ 11.89GHz, respectively with VSWR < 2 except in the notched bands. The antennas are designed and optimized in CST Microwave Studio. The simulated VSWR of the proposed antenna designs is compared with the measured VSWR of fabricated antennas, and it is found that they are in a good agreement. Both antennas exhibit monopole-like radiation patterns with signiflcant gain in entire operating band. Maximum gain of the proposed antenna with symmetric ground plane is 5.3dBi at 8GHz, and that with asymmetric ground plane is 4.5dBi at 7GHz.

Uniplanar Ultrawideband Polarization Diversity Antenna With Dual Band-Notched Characteristics

A uniplanar ultrawideband diversity antenna with dual band-notched characteristics is presented in this letter. The antenna employs orthogonal feeding structure to achieve polarization diversity performance over the ultrawideband from 2.3 to 11 GHz. The dual band-rejected operation is realized by employing two different methods. In addition, the stepped rectangle stub inserted in the ground at $45^\circ$ and irregular ground plane are adopted to enhance port isolation and antenna performance. The antenna was fabricated to study the performance such as $S$ -parameters, radiation pattern, peak gain, antenna efficiency, and envelope correlation coefficient. Reasonable results show the suitability of the proposed antenna for portable terminal devices.

DUAL BAND NOTCHED UWB MONOPOLE ANTENNA USING EMBEDDED OMEGA SLOT AND FRACTAL SHAPED GROUND PLANE

This paper presents the development of an Ultra Wide Band (UWB) monopole antenna with dual band notch characteristics. Modifled crown-square shaped fractal slots in the ground-plane are implemented to enhance the impedance bandwidth to around 58% as compared to conventional square monopole antenna without slots. Impedance bandwidth of the proposed antenna is approximately 114% with Voltage standing wave ratio (VSWR) < 2. In addition to this, two omega-shaped (›) slots have been incorporated in the radiating patch to render band-notch characteristics centered at 5.5GHz band assigned to IEEE802.11a and HIPERLAN/2 as well as X-band for satellite communication centered at 7.5GHz band. Measured antenna gain is stable over the entire UWB region except at the notch bands. Radiation pattern of the antenna show that the proposed antenna exhibits nearly monopole like E plane radiation patterns and omni-directional H plane radiation patterns throughout the band. A fabricated prototype is developed with close agreement between simulated and measured results.

ANALYSIS OF CPW-FED UWB ANTENNA FOR WIMAX AND WLAN BAND REJECTION

A compact ultra wide band (UWB) antenna with dual band notch characteristics is proposed. The antenna consists of a coplanar waveguide (CPW) fed bevelled rectangular patch and a modifled rectangular ground plane. A Z-shaped meander line parasitic element and a pair of symmetrical L-shaped quarter-wavelength stubs are employed to realise band-notched functions at WiMAX and WLAN bands respectively. By optimizing the dimensions and positions of these notch structures, the desired notch-bands of WLAN and WiMAX are achieved. Unlike other dual band-notched antennas reported in literature this antenna has a merit of regulating the centre frequency as well as the bandwidth of both the notched bands easily and independently. The measured i10dB S11 covers the bandwidth from 2.5 to 11.5GHz, with two notched bands from 3.3 to 3.6GHz and 5.2 to 5.75GHz. The proposed antenna exhibits nearly omni-directional radiation patterns with moderate gain and small group delay variations less than 0.5ns over the entire operating bandwidth except at the notched bands. Moreover, by using antenna transfer function, the time domain characteristic of the antenna is also studied to conflrm its suitability for UWB pulse communication.

Ultra‐wideband tapered slot antenna with dual band‐notched characteristics

A novel tapered slot antenna (TSA) with 3.5/5.5 GHz dual band-notched characteristics for ultra-wideband radios is proposed in this study. To realise dual band-notched characteristics at the TSA, the author employ (a) a pair of nested C-shaped stubs beside the feed line and (b) a broadband microstrip-slotline transition with an Archimedean spiral-shaped slot. The proposed antenna has been successfully simulated, implemented and measured. Measured data for the optimised case show the bandwidth for the voltage standing wave ratio < 2 to be 9.2 GHz (from 2.4 to 11.6 GHz) with two notched bands of 3.1–4.0 GHz (world interoperability for microwave access band) and 5.1–6.2 GHz (wireless local area network band), respectively. The measured electrical parameters of the proposed antenna and its radiation patterns show excellent performance with good pulse handling capabilities. Also, the 3.5/5.5 GHz dual band-notched characteristics are achieved without increasing the size of the single band-notched TSA reported previously.

Design and Analysis of a Novel Dual Band-Notched UWB Antenna

A novel ultrawide band (UWB) antenna with dual band-notched characteristics is presented. The first band rejection is provided by an arc H-shaped slot on the radiating patch. The parametric study of the arc H-shaped slot shows that this structure enables rejectband characteristic with improved control compared to traditional H-shaped slot. Based on the single band-notched UWB antenna, the second notched band is realized by etching narrow slots on the ground plane. By tuning the parameters of these slots, the proposed UWB antenna can operate from 2.9 GHz to above 10 GHz, except for the bandwidth of 3.3–3.6 GHz for WiMAX application and 5.1–5.9 GHz for WLAN application. Simulated and measured results show that the proposed antenna provides excellent band rejection and is a good candidate for future UWB application.

Compact Microstrip Antenna Structures with Multiband, Broadband, and Band-Notched Properties, for Portable Devices

It is difficult to list all the current applications for microstrip antennas; it could be said that they are the transducers that control modern life. Yet, every year, new applications are required which challenge the performance limits of current designs. Some of those challenges are associated with controlling the spectrum performance and continuing to seek techniques to tailor the shape to the applications. This special issue brings some of the latest thinking in compact microstrip antenna design. However, the variety of approaches presented in the papers shows the possibilities that exist for future developments: this special issue is as much about setting out possibilities as it is about presenting new thinking. The papers in this special issue are as follows. An approach to design microstrip antennas is presented in “Design of arbitrarily shaped planar microstrip antenna arrays with improved efficiency” which considers improved radiation efficiency. Focusing on the application areas of Bluetooth and WLAN, a dual-band planar inverted-E antenna (PIEA) is presented in “Compact dual-band planar inverted-eshaped antenna using defected ground structure” with a novel ground. A mesh grid structure planar wideband zero index metamaterial (ZIM) antenna is presented in “Zero index metamaterial for designing high-gain patch antenna” that provides a bandwidth of 9.9GHz to 11.4 GHz.An arc H-shaped slot on the radiating patch provides dual bandnotched characteristics which is discussed in “Design and analysis of a novel dual band-notched UWB antenna.” The paper entitled “Printed modified bow-tie dipole antenna for DVB/WLAN applications” presents a printed modified bow-tie dipole antenna which consists of asymmetric feed and inserted slots. A frequency range of 3.1– 10.6GHz is achieved by an antenna of only 30mm × 36mm and is discussed in “A compact UWB diversity antenna.” Amodified compact planar ultrawideband (UWB) monopole antenna with triple controllable band-notched characteristics is presented in “A compact planar UWB antenna with triple controllable band-notched characteristics,” which consists of a modified staircased V-shaped radiating element and partial ground plane. The radiation pattern is controlled using elliptical and rectangular patches, which is discussed in “A compact size 4–19.1 GHz heart shape UWB antenna with triangular patches.”

DESIGN OF COMPACT ASYMMETRIC COPLANAR STRIP-FED UWB ANTENNA WITH DUAL BAND-NOTCHED CHARACTERISTICS

In this paper, a new design of asymmetric coplanar strip (ACS)-fed UWB planar monopole antenna with dual band-notched characteristics is presented and investigated. The proposed antenna is composed of an asymmetric ground plane, a semi-circular radiator, together with two open-ended half wavelength bow-shaped slots etched on the radiation patch. This leads to the desired dual notched bands of 3.12{3.69GHz for WiMAX and 5.51{6.01GHz for WLAN. Experimental results show that the designed antenna, with compact size of 29:5 £ 12mm 2 , has stable and omnidirectional radiation pattern, sharp reduction in gain and group delay at notched frequencies. The very simple feeding structure and compact uniplanar design make it easy to be integrated within the portable device for UWB communication systems.

CLOSELY SPACED DUAL BAND-NOTCHED UWB ANTENNA FOR MIMO APPLICATIONS

A closely spaced dual-band notched UWB MIMO antenna is proposed in this paper. A traditional semi-circular monopole with ultra-wideband operation is chosen as an element of the proposed MIMO antenna. When two of the UWB monopoles are put together closely, the mutual coupling between them is apparently strong. To reduce the coupling between the antenna elements, a T-shaped branch is inserted between them, which reduces the mutual coupling obviously over the entire operating band. Also, the T-shaped branch can perform as a compensating radiator which can lower the operating frequencies of the proposed antenna. In order to achieve dual band-notched characteristics, meandering slots are cut in the patches, and symmetrical C-shape strips are nearly placed to the monopoles' feed-lines. The meandering slot is for lower band notch (WiMAX, 3.3{3.7GHz) while the C-shape strips are for upper band (WLAN, 5.15{5.825GHz). The measured radiation e-ciencies, peak gains and radiation patterns are illustrated and show good agreement as anticipated.

A COMPACT DUAL SHARP BAND-NOTCHED UWB ANTENNA WITH OPEN-ENDED SLOTS

A compact microstrip-fed antenna with dual band-notched characteristics for ultrawideband (UWB) applications is presented. By introducing two open-ended inverted L-shaped slots, two sharp notches are achieved at frequencies of 3.16-3.70 GHz and 5.10-5.95 GHz for VSWR > 2. A rectangular slot in the ground plane can improve the impedance bandwidth of the proposed antenna. The prototype occupies a compact area of 22 × 26 mm 2 . The measurement results indicate that the proposed antenna can reject the interference with coexisting worldwide interoperability for microwave access (WiMAX) and wireless local area network (WLAN) systems. The proposed antenna shows relatively omnidirectional radiation patterns in the pass band.

A COMPACT DUAL BAND-NOTCHED ULTRAWIDEBAND ANTENNA WITH Λ/4 STUB AND OPEN SLOTS

A novel compact UWB antenna with 3.5/5.5GHz dual notch-band characteristics is presented. The proposed antenna has a simple structure and compact size of 30 £ 35mm 2 . Firstly, a compact modifled rotated monopole antenna that covers UWB band is achieved. Then by inserting a ‚/4 stub and etching two symmetrical ‚/4 L-shape slots on the UWB antenna achieved before, a dual band-notched ultra-wideband antenna is obtained. The prototypes of UWB antenna with and without notched bands were fabricated and measured. Good performance of dual notched bands, stable gain and omnidirectional radiation patterns make the proposed antenna promising for UWB application.

Band-notched printed log-periodic dipole antennas using loaded slots pair (LSP) resonators

Novel printed log-periodic dipole antennas (PLPDAs) with 3.5/5.5 GHz dual band-notched characteristics are investigated in this paper. The proposed antennas are comprised of a modified ground plane etched with rectangular slots, which are capable of tailoring the input impedance. Loaded slots pair (LSP) resonators are cut in the radiators to achieve band-notch mechanism. By etching several pairs of U-shaped LSPs on the radiation structure of the PLPDA, multiple notched bands are generated for blocking the interference from other narrow band wireless communication systems. Antennas with the notched-band of World Interoperability for Microwave Access/Wireless Local Area Network operating frequencies are designed and fabricated. The measured impedance bandwidth defined by voltage standing wave ratios <2 of 8.0 GHz (3.0–11 GHz), with the dual notched bands of 3.3–3.6 and 5.0–6.0 GHz, is obtained. Measured and simulated reflection coefficient curves are provided along with normalized beam patterns, gain and group delay values as a function of frequency.

An UWB antenna using modified Hilbert curve slot for dual band notch characteristics

A printed dual band notched ultra wideband monopole antenna with a single perturbed Hilbert curve slot is presented which exhibits 121% impedance bandwidth. A single modified Hilbert curve slot provides dual band notch characteristics in the range of 3.3–3.7 GHz (WiMAX), 3.7–4.2 GHz (C-Band), and 5.15–5.825 GHz (WLAN) which makes the notch design process simpler than other dual band notched antennas. The gain of the proposed antenna varies from 3 to 4 dBi over its operating frequency range, except at the rejection bands. Suitable radiation characteristics are obtained throughout its operating band. Simulation and measured results of the proposed antenna are in good agreement.

A Small UWB CPW-FED Monopole Antenna with Double Band-Notch Property

A compact ultrawideband CPW-fed monopole antenna is presented that includes dual band-notch characteristics. The antenna consists of a modified V-shaped patch with two resonant structures to create the required band-notch function at the desired frequency bands to mitigate interference from WLAN and WiMAX systems. The band-notch structures comprise of a rectangular-shaped conductor backed plane and a rectangular-shaped slot inserted within the antenna patch. The center frequency of the band-notch can be varied prior to fabrication without affecting the antenna's overall characteristics. The antenna's performance was verified through measurements, which show that it operates across a large bandwidth between 2.9 and 12.7 GHz for VSWR <2 and provides band reject performance between 3.3–3.8 GHz and 5.2–5.8 GHz. The antenna's dimensions are 19.5 × 21 × 1 mm3. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1840–1845, 2013