scholarly journals A Reconfigurable Triple-Notch-Band Antenna Integrated with Defected Microstrip Structure Band-Stop Filter for Ultra-Wideband Cognitive Radio Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Yingsong Li ◽  
Wenxing Li ◽  
Qiubo Ye
Keyword(s):  
Cognitive Radio ◽  
Narrow Band ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Design Procedures ◽  
Notch Band ◽  
Band Stop Filter ◽  
Microstrip Structure ◽  
Microstrip Feed

A printed reconfigurable ultra-wideband (UWB) monopole antenna with triple narrow band-notched characteristics is proposed for cognitive radio applications in this paper. The triple narrow band-notched frequencies are obtained using a defected microstrip structure (DMS) band stop filter (BSF) embedded in the microstrip feed line and an invertedπ-shaped slot etched in the rectangular radiation patch, respectively. Reconfigurable characteristics of the proposed cognitive radio antenna (CRA) are achieved by means of four ideal switches integrated on the DMS-BSF and the invertedπ-shaped slot. The proposed UWB CRA can work at eight modes by controlling switches ON and OFF. Moreover, impedance bandwidth, design procedures, and radiation patterns are presented for analysis and explanation of this antenna. The designed antenna operates over the frequency band between 3.1 GHz and 14 GHz (bandwidth of 127.5%), with three notched bands from 4.2 GHz to 6.2 GHz (38.5%), 6.6 GHz to 7.0 GHz (6%), and 12.2 GHz to 14 GHz (13.7%). The antenna is successfully simulated, fabricated, and measured. The results show that it has wide impedance bandwidth, multimodes characteristics, stable gain, and omnidirectional radiation patterns.

A Dual Polarized Ultra-Wideband Slot Antenna Using Stepped Microstrip Feed Structure

Frequenz ◽  
2015 ◽  
Vol 69 (11-12) ◽  
Author(s):  
R. V. S. Ram Krishna ◽  
Raj Kumar
Keyword(s):  
Impedance Matching ◽  
Correlation Coefficients ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Dual Polarization ◽  
Printed Circuit ◽  
Peak Gain ◽  
Microstrip Feed

AbstractIn this paper, a printed slot antenna for ultra-wideband dual polarization is proposed and experimentally demonstrated. The slot is L-shape and its two arms are individually microstrip fed for producing the orthogonal polarizations. The slot arms and the microstrip feed lines are step sectioned for wideband impedance matching. For isolation purpose, a slant narrow metallic stub is inserted at the junction of the slot arms. The antenna has an impedance bandwidth of 118% (3.1–12 GHz) and isolation of around 20 dB over most of the band. The radiation patterns are nearly omnidirectional with a peak gain varying from 3 to 6 dBi. For assessing the diversity performance of the antenna, the envelope correlation coefficients are computed from the simulated and measured S-parameters and found to be within acceptable limits. With a compact, single substrate design, the antenna is expected to be useful for printed circuit ultra wideband applications requiring dual polarization features.

Low-profile U-shaped DRA for ultra-wideband applications

2016 ◽  
Vol 9 (3) ◽  
pp. 621-627 ◽  
Author(s):  
Idris Messaoudene ◽  
Tayeb A. Denidni ◽  
Abdelmadjid Benghalia
Keyword(s):  
Dielectric Resonator ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Radiation Patterns ◽  
Wide Bandwidth ◽  
Operating Band ◽  
Low Profile ◽  
Measurement Results

In this paper, a microstrip-fed U-shaped dielectric resonator antenna (DRA) is simulated, designed, and fabricated. This antenna, in its simple configuration, operates from 5.45 to 10.8 GHz. To enhance its impedance bandwidth, the ground plane is first modified, which leads to an extended bandwidth from 4 to 10.8 GHz. Then by inserting a rectangular metallic patch inside the U-shaped DRA, the bandwidth is increased more to achieve an operating band from 2.65 to 10.9 GHz. To validate these results, an experimental antenna prototype is fabricated and measured. The obtained measurement results show that the proposed antenna can provide an ultra-wide bandwidth and a symmetric bidirectional radiation patterns. With these features, the proposed antenna is suitable for ultra-wideband applications.

scholarly journals Reconfigured and Notched Tapered Slot UWB Antenna for Cognitive Radio Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Tamer Aboufoul ◽  
Akram Alomainy ◽  
Clive Parini
Keyword(s):  
Cognitive Radio ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Total Efficiency ◽  
Back Side ◽  
Radiation Patterns ◽  
Uwb Antenna ◽  
Design Concepts ◽  
Specific Frequency

A compact reconfigurable and notched ultra-wideband (UWB) tapered slot antenna (TSA) is presented. The antenna reconfiguration operation principle relies on 2 mechanisms: in the first mechanism a resonator parasitic microstrip line electrically coupled to the TSA is used to notch the TSA at a specific frequency and the second mechanism relies on changing the input impedance matching of the antenna by means of changing the length of a stub line extended from an additional tiny partial ground on the back side of the antenna. The reflection coefficient, radiation patterns, and gain simulations and measurements for the proposed antenna are presented to verify the design concepts featuring a very satisfactory performance. Total efficiency simulations and measurements are also presented to highlight the filtering performance of the reconfigured antenna. When the antenna was reconfigured from the UWB to work into multiple frequency bands, the radiation patterns were still the same and the total peak gain has slightly improved compared to the UWB case. In addition, when the antenna operated in the notched mode, the gain has significantly dropped at the notch frequency. The simplicity and flexibility of the proposed multimode antenna make it a good candidate for future cognitive radio front ends.

Compact UWB monopole antenna with reconfigurable band-notch characteristics

2019 ◽  
Vol 12 (3) ◽  
pp. 252-258 ◽  
Author(s):  
Liping Han ◽  
Jing Chen ◽  
Wenmei Zhang
Keyword(s):  
Ground Plane ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Dual Band ◽  
Radiation Patterns ◽  
Pin Diodes ◽  
Notch Band ◽  
Rectangular Patch ◽  
Compact Size ◽  
Defected Ground Plane

AbstractA compact ultra-wideband (UWB) monopole antenna with reconfigurable band-notch characteristics is demonstrated in this paper. It is comprised of a modified rectangular patch and a defected ground plane. The band-notch property in the WiMAX and WLAN bands is achieved by etching an open-ended slot on the radiating patch and an inverted U-shaped slot on the ground plane, respectively. To obtain the reconfigurable band-notch performance, two PIN diodes are inserted in the slots, and then the notch-band can be switched by changing the states of the PIN diodes. The antenna has a compact size of 0.47 λ1 × 0.27 λ1. The simulated and measured results indicate that the antenna can operate at a UWB mode, two single band-notch modes, and a dual band-notch mode. Moreover, stable radiation patterns are obtained.

CPW-Fed 8-Shaped Monopole Antenna for Ultra Wideband Applications

Frequenz ◽  
2016 ◽  
Vol 70 (11-12) ◽  
Author(s):  
Sarthak Singhal ◽  
Amit Kumar Singh
Keyword(s):  
Group Delay ◽  
Coplanar Waveguide ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Antenna Structure ◽  
Operating Frequency Range ◽  
Good Agreement ◽  
Delay Variation

AbstractA CPW-fed 8-shaped monopole antenna for ultra wideband applications is presented. It consists of a 8-shaped monopole and two quarter elliptical coplanar waveguide ground planes. An impedance bandwidth from 5.4 GHz to 23.83 GHz is achieved. The radiation patterns are observed to be omnidirectional and bidirectional in E-and H-plane respectively at lower resonances. At higher frequencies, the radiation patterns are found to be nearly omnidirectional in both planes. The group delay variation is also observed to be constant in the operating frequency range. A good agreement is found between the simulation and experimental results. The designed antenna structure has miniaturized dimensions and wider bandwidth as compared to other already reported monopole structures.

scholarly journals Dual Port Antenna Combining Sensing and Communication Tasks for Cognitive Radio

2016 ◽  
Vol 62 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Hamza Nachouane ◽  
Abdellah Najid ◽  
Abdelwahed Tribak ◽  
Fatima Riouch
Keyword(s):  
Cognitive Radio ◽  
Dynamic Spectrum Access ◽  
Antenna System ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Manufacturing Cost ◽  
Communication Task ◽  
Wide Range ◽  
Radio Technology ◽  
Radio Systems

Abstract Dynamic spectrum access has been proposed as the effective solution to overcome the spectrum scarcity issue, supported by cognitive radio technology. Sensing and communication functions are both the most important tasks in cognitive radio systems. In this paper, an antenna system combining sensing and communication tasks is proposed to be integrated into cognitive radio front-ends. The sensing task is performed by means of an ultra-wideband quasi-omnidirectional antenna. Whilst the communication task is ensured by using a narrowband antenna. Both antennas have been designed on the same layer of an FR4 substrate, for manufacturing cost constraint. Therefore, the isolation between them must take into consideration. The measured mutual coupling of less than -18 dB is achieved over the whole impedance bandwidth. The proposed sensing antenna covers a wide range frequency bands ranging from 2 to 5.5 GHz. While the communication antenna operates at 2.8 GHz, and by adding inductors to the antenna, the resonant frequency can be tuned from 2.6 to 2.7 GHz. The whole antenna system was designed, fabricated, and tested. Measurement and simulation results prove the feasibility of the proposed structure for cognitive radio applications.

scholarly journals Cross-Slot Antenna with U-Shaped Tuning Stub for Ultra-Wideband Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Dawood Seyed Javan ◽  
Mohammad Ali Salari ◽  
Omid Hashemi Ghoochani
Keyword(s):  
Radiation Pattern ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Design Procedures ◽  
Linearly Polarized ◽  
Dimensional Parameters ◽  
Simulation Results ◽  
Novel Design ◽  
Better Than

A novel design of an ultra-wideband (UWB) slot antenna is presented. This antenna operates as a transmitter and receiver antenna. Effects of the antenna dimensional parameters are studied through experimental and simulation results. Design procedures are developed and verified for different frequency bands. The experimental and simulation results exhibit good impedance bandwidth, radiation pattern, and relatively constant gain over the entire band of frequency. Antenna gain and directivity at boresight and in their maximum states are close to each other and indicate high radiation efficiency. To use the antenna as a linearly polarized antenna, the radiation pattern in E-plane is better thanthat inH-plane.

scholarly journals Design of Ultra Wideband Antenna

2020 ◽  
Vol 8 (5) ◽  
pp. 3988-3990
Keyword(s):  
Return Loss ◽  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Ground Plane ◽  
Dielectric Substrate ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Rectangular Patch ◽  
Microstrip Feed

In this paper, A coplanar waveguide (CPW) ultra-wideband(UWB) antenna is designed, analyzed and simulated by computer simulation technology(CST). The proposed antenna is fabricated on FR-4 dielectric substrate. A microstrip feed line is used to excite the antenna.The ground plane is slotted to improve the impedance bandwidth (BW). Here, a rectangular patch is used as radiator and two corners out of four are truncated to improve impedance matching and UWB characterization.This antenna satisfies UWB characteristics like VSWR<2, Return loss(S11)<-10 dB,Gain<5dB and the antenna is operating within the frequency range of 1.59 to 11.87 GHz range which covers whole ultra wideband i.e. 3.1 to 10.6 GHz range.

scholarly journals Advanced Techniques and Antenna Design for Pulse Shaping in UWB Cognitive Radio

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Lise Safatly ◽  
Mohammed Al-Husseini ◽  
Ali El-Hajj ◽  
Karim Y. Kabalan
Keyword(s):  
Cognitive Radio ◽  
Pulse Shaping ◽  
Hardware Implementation ◽  
Spectrum Management ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Interference Avoidance ◽  
Secondary Users ◽  
Band Stop Filter ◽  
Primary Problem

Spectrum scarcity has emerged as a primary problem in the communications technology. The combination of cognitive radio (CR) and ultra-wideband impulse radio (UWB-IR) has been proposed to solve the shortage problem by allowing smart and adaptive spectrum management, leading to UWB-CR. In a UWB-CR scheme, secondary users are supposed to ensure interference avoidance by adaptively selecting the portions of the spectrum not being used by primary users. In this paper, three different techniques for the generation of adaptive UWB pulses are studied. The Parks-McClellan algorithm is employed, a neural network is trained, and a reconfigurable band stop filter is designed to generate an adaptive waveform with nulls at specific frequencies. Simulations, measurements, and analysis show that each generated UWB pulse has remarkable advantages in the frequency utilization, spectrum avoidance, and hardware implementation.

Sign in / Sign up

Export Citation Format

Share Document