scholarly journals Band-Notched Antipodal Vivaldi Antenna using Edge-Located Vias Mushroom EBG Structure for Ultra Wideband Applications

2020 ◽  
Vol 9 (4) ◽  
pp. 2455-2459
Keyword(s):  
Dielectric Material ◽  
Low Cost ◽  
Surface Current ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Ieee 802.11A ◽  
Notch Band ◽  
Directional Radiation ◽  
Field Radiation ◽  
Vivaldi Antenna

An Ultra wideband (UWB) Antipodal Vivaldi Antenna operating at 2.78 GHz to more than 12 GHz with dual notch band attributes is designed for application in ultra-wideband. The proposed double-layered antenna is designed on a low cost FR-4 dielectric material with combined thickness of 2.1mm. Two edge-located vias mushroom type EBG metamaterial structures were incorporated within a conventional antipodal Vivaldi antenna (AVA) in between the two substrate layers and below the feeding line, to realize the proposed antenna. Using the band gap property of the EBG structure, two notch bands were created within the ultra wideband frequency range of the antenna for WiMAX IEEE 802.16 application at 3.18 – 3.80 GHz and WLAN IEEE 802.11a application at 5.13 – 5.80 GHz. Simulation results showed a almost stable directional radiation pattern in the entire frequency range except in the two notch bands, having a peak realize gain of 7.69 dBi at 6.5 GHz. Additionally, surface current distribution and far-field radiation patterns are also studied to characterize the achievement of the presented antenna.

scholarly journals Design an Ultra- Wideband Modified Wilkinson Power Divider Fed-by Balanced Antipodal Vivaldi Antenna Array for Imaging Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 4236-4241
Keyword(s):  
Low Cost ◽  
Impedance Matching ◽  
Simulation Software ◽  
Ultra Wideband ◽  
Power Divider ◽  
Power Splitting ◽  
Frequency Range ◽  
Radial Stub ◽  
Vivaldi Antenna ◽  
Wilkinson Power Divider

In this paper, design of compactand modified geometrical structure of 1-to-4 way ultra-wideband Wilkinson power divider used as a feeding network for 4-element of balanced antipodal Vivaldi antenna (BAVA) array has introduced. The proposed Wilkinson power divider has been designed and printed on low-cost Epoxy laminate substrate FR4 along with the thickness of 1.6mm and relative permittivity of ɛr =4.3 respectively. The transformation of power divider network which are based on bent corners as a replacement of sharp corners or edges used for the decrement in unintended radiation and employing a single radial stub on each branch to encounter the antenna-specifications. Further some adjustments in the dimension of stubs matching in order to increase the reflection of the power divider network. The design presents the model of a power divider and maintains an equal power splitting at different ports with practical insertion loss and conventional return loss below -10dB. The reasonable impedance matching has achieved at every single port with acceptable isolation performance values over the (3-to-10 GHz) frequency range. The divider as well as antenna elements design and its optimization are practicable via computer simulation technology (CST) simulation software. The experimental results are revealed to encounter the arrayspecifications under ultra-wideband frequency range..

scholarly journals A Circular Disc Microstrip Antenna with Dual Notch Band for GSM/Bluetooth and Extended UWB Applications

2018 ◽  
Vol 7 (2.16) ◽  
pp. 11
Author(s):  
Sanjeev Kumar ◽  
Ravi Kumar ◽  
Rajesh Kumar Vishwakarma
Keyword(s):  
Radiation Pattern ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Circular Disc ◽  
Ultra Wideband ◽  
Resonant Circuit ◽  
Frequency Range ◽  
Notch Band ◽  
Uwb Applications ◽  
Ku Band

A microstrip antenna with a circular disc design and modified ground is proposed in this paper. Circular shapes of different size have been slotted out from the radiating patch for achieving extended ultra wideband (UWB) with GSM/Bluetooth bands with maximum bandwidth of 17.7 GHz (0.88-18.6 GHz). Further, characteristic of dual notch band is achieved, when a combination of T and L-shaped slots are etched into the circular disc and ground plane respectively. Change in length of slots is controlling the notch band characteristics. The proposed antenna has rejection bandwidth of 1.3-2.2 GHz (LTE band), 3.2-3.9 GHz (WiMAX band) and 5.2-6.1 GHz (WLAN band) respectively. It covers the frequency range of 0.88-18.5 GHz with the VSWR of less than 2. Also, an equivalent parallel resonant circuit has been demonstrated for band notched frequencies of the designed antenna. The gain achieved by the proposed antenna is 6.27 dBi. This antenna has been designed, investigated and fabricated for GSM, Bluetooth, UWB, X and Ku band applications. The stable gain including H & E-plane radiation pattern with good directivity and omnidirectional behavior is achieved by the proposed antenna. Measured bandwidths are 0.5 GHz, 0.8 GHz, 1.1 GHz and 11.7 GHz respectively. 

scholarly journals A Band-Rejection Vivaldi Antenna with High Selectivity Using Hybrid HRW/CCLL

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mengfei Xiong ◽  
Junping Duan ◽  
Binzhen Zhang
Keyword(s):  
Frequency Band ◽  
Design Method ◽  
Directional Pattern ◽  
Impedance Bandwidth ◽  
Ieee 802.11A ◽  
Notch Band ◽  
Notched Band ◽  
Half Wavelength ◽  
Measurement Results ◽  
Vivaldi Antenna

A simplified notched design method for the Vivaldi antenna is exhibiting high frequency-band-selectivity characteristics. By suitably introducing half-wavelength resonator (HWR) and complementary capacitively loaded loop (CCLL), the notched-band selectivity is promoted while maintaining the wide impedance bandwidth of the antenna applicable for wireless communications. HWR is bent in the middle to focus the first notch pole, and the second notch pole is obtained by CCLL on the radiating patch. Additionally, the resonant frequency of the notched pole can be determined by the position and size of two loaded resonators in theoretical analysis, thereby realizing a wideband antenna with the desired notched band. Finally, the Vivaldi antenna of loading resonator was fabricated to verify the feasibility of this new method. Measured and simulated experimental results reveal that the antenna exhibits directional pattern in the passband, low gain at the band-rejection, and excellent selectivity within a frequency range. The simulation and measurement results are in good agreement. The proposed antenna achieves S11<−10 dB in 2.6–13.7 GHz and a notch band from 4.49 to 6.64 GHz to reject IEEE 802.11a and HIPERLAN/2 frequency band. Moreover, the proposed antenna has good frequency selectivity, and its gain is good enough in the passband with peak gain up to 10.8 dBi. This antenna design presents frequency suitability, demonstrating that a UWB antenna with a controllable notched band has been realized.

A Novel Compact UWB Monopole Antenna with Bluetooth and Triple Notch Band

Frequenz ◽  
2013 ◽  
Vol 67 (1-2) ◽  
pp. 1-5
Author(s):  
Li Li ◽  
Zhi-Li Zhou ◽  
Jing-Song Hong
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Rectangular Slot ◽  
Feed Line ◽  
Notch Band ◽  
Directional Radiation ◽  
Compact Size ◽  
Current Area

AbstractA novel technique to add an extra Bluetooth band and triple notch bands simultaneously to a compact ultra-wideband (UWB) monopole antenna is presented. This scissors-shaped UWB antenna, covering 2.9 GHz–12.5 GHz, is fed by a special microstrip line. To create an extra Bluetooth band centered at 2.45 GHz, an arc-shaped stub is attached to the high concentrated current area right of the feed line and a rectangular slot is etched in the radiation patch. Besides, a notch band for WLAN (5.6 GHz–6.15 GHz) is also obtained. In addition, by connecting two asymmetric stubs to the feed line, two other notch bands in 3.28 GHz–3.8 GHz for WiMAX and 7.1 GHz–7.76 GHz for downlink of X-band satellite communication systems are achieved. The proposed antenna with compact size of 20 mm × 26 mm is fabricated and measured, showing stable antenna gain and good omni-directional radiation patterns in H-plane.

Low-cost analog fiber optic links for in-house distribution of millimeter-wave signals

2011 ◽  
Vol 3 (2) ◽  
pp. 231-236 ◽  
Author(s):  
Friederike Brendel ◽  
Julien Poëtte ◽  
Béatrice Cabon ◽  
Frédéric van Dijk
Keyword(s):  
Millimeter Wave ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fiber Optic ◽  
Low Cost ◽  
Ultra Wideband ◽  
60 Ghz ◽  
Error Vector Magnitude ◽  
Ieee 802.11A ◽  
Data Rates ◽  
Vector Magnitude

In this article, analog fiber optic links (radio-over-fiber, RoF, links) are presented as a flexible, low-cost solution for in-house distribution of millimeter-wave (mmw) signals. Mode-locked laser diodes (MLLD) serve as inexpensive mmw sources for the downlink distribution of mmw signals across an optical fiber link. We compare the robustness of direct and external RF modulation for such MLLD-based RoF systems, whereas the error vector magnitude (EVM) of the received symbols serves as a figure of merit. On the eve of 60 GHz WLAN standardization, we experimentally investigate the transmission of narrowband WLAN (IEEE 802.11a) signals in the millimetric range at moderate data rates. We also demonstrate broadband transmission of multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) european computer manufacturers association (ECMA 368) signals in the 60 GHz band for data rates of up to 480 Mbps.

scholarly journals Design of a Compact UWB Antenna with Triple Band-Notched Characteristics

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Qiang Wang ◽  
Yan Zhang
Keyword(s):  
Input Impedance ◽  
Impedance Matching ◽  
Ground Plane ◽  
Surface Current ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Notch Band ◽  
Parametric Studies ◽  
Triple Band

A new compact ultra-wideband (UWB) antenna with triband-notched characteristics is presented. The structure of the proposed antenna is simple and symmetric. A modified ground is introduced to obtain a wide impedance bandwidth of 2.9–13.4 GHz withS11<-10 dB. By inserting two arc-shaped slots in the radiation patch, two sharp bands of 3.3–3.7 GHz and 5.15–5.35 GHz are notched. The notch band of 7.25–7.75 GHz is achieved by etching a U-shaped slot in the ground plane. The notched bands can be controlled, respectively, while the characteristics of the proposed UWB antenna almost keep completely unchanged at the unnotched frequencies. Equivalent circuit models, surface current distributions, and input impedance are applied to analyze the principle of the proposed UWB antenna. Parametric studies are given. Simulated and measured results show that the proposed antenna has good impedance matching, stable radiation patterns, and constant gain.

Star-L-Shaped Circularly Polarized Ultra-Wideband Microstrip Antenna for Wireless Applications

2014 ◽  
Vol 548-549 ◽  
pp. 776-779 ◽  
Author(s):  
Rudy Yuwono ◽  
Ronanobelta Syakura
Keyword(s):  
Circular Polarization ◽  
Microstrip Antenna ◽  
Low Cost ◽  
Ultra Wideband ◽  
Wireless Technology ◽  
Frequency Range ◽  
Wireless System ◽  
Circularly Polarized ◽  
Wireless Applications ◽  
Antenna Performance

The deployment of the wireless technology since FCC regulated the UWB technology spectrum was going rapidly. The wireless system that supports UWB, especially the antenna as the transducer should be UWB supported beside the other existed wireless technology, ease to fabricate and low cost. Not only that, The antenna performance should be has circular polarization to reduce misalignment. With the dimension of 60 x 60 mm made from FR-4 epoxy 0.8 mm thickness, and L-shape for the feedline with the star shape as the patch, the microstrip antenna can work at the frequency of 2 up to 9.8 GHz and has circular polarization in the frequency range of 2 up to 3.3 GHz.

Design of a CPW-fed UWB printed antenna with dual notch band using mushroom structure

2015 ◽  
Vol 9 (2) ◽  
pp. 327-334 ◽  
Author(s):  
Tapan Mandal ◽  
Santanu Das
Keyword(s):  
Group Delay ◽  
Coplanar Waveguide ◽  
Surface Current ◽  
Ultra Wideband ◽  
Dual Band ◽  
Pass Band ◽  
Printed Antenna ◽  
Operating Band ◽  
Notch Band ◽  
Constant Group

A coplanar waveguide-fed planar hexagonal monopole ultra-wideband antenna with dual-band rejection characteristics is proposed in this paper. The desired notch frequencies at 3.5 and 5.5 GHz are realized by incorporating mushroom structures. The input impedance and surface current distributions are used for analysis and explanation of the effects of mushroom cells. The prototype and proposed antennas are fabricated and tested. From the measured results, the proposed antenna provides an operating band of 2.81–14.32 GHz for 2 ≤ voltage standing wave ratio (VSWR), while the dual-band stop function is in the frequency bands of 3.3–3.7 GHz and 5.10–5.88 GHz. Moreover, the antenna model also exhibits constant group delay and linear phase in the pass band. The proposed antenna has appreciable gain and efficiency over the whole operating band except the notch bands.

Experimental verification of super-compact ultra-wideband (UWB) polarization and incident angle-independent metamaterial absorber

2020 ◽  
pp. 1-11
Author(s):  
Manpreet Kaur ◽  
Hari Shankar Singh
Keyword(s):  
Incident Angle ◽  
Low Cost ◽  
Surface Current ◽  
Cost Effective ◽  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Capacitive Coupling ◽  
Ultra Wideband ◽  
Absorption Mechanism ◽  
The Stability

Abstract In this paper, a super-compact ultra-wideband (UWB) metamaterial absorber (MMA) is presented. The absorber design consists of an inverted L-shaped structure and a diagonal rectangular-shaped structure. The capacitive coupling between these two structures not only provides UWB nature but also provides a super-compact absorber design. The dimension of the unit cell arrangement is 5 × 5 mm2 and printed on a low-cost FR-4 substrate of thickness 1.54 mm (0.061λlowest). The design absorber provides more than 97% absorptivity from 12 to 21 GHz for normal incidence electromagnetic (EM) wave. However, the proposed MMA has a full width at half maximum absorption bandwidth of 11.71 GHz from 10.34 to 22.05 GHz. Moreover, the surface current distributions have been analyzed to understand the absorption mechanism of the MMA. The stability of the proposed design is validated with different incident angles (for TE and TM modes) and different polarization angles. Finally, the absorber design is fabricated and verified experimentally. Furthermore, the UWB frequency range, high absorption, ease in design and fabrication, and cost-effective make it suitable for different quality applications in stealth technology, thermal imaging, radar detection, antenna systems, and other EM devices.

scholarly journals Coplanar waveguide-fed ultra-wideband antenna with WLAN band

2021 ◽  
Vol 21 (3) ◽  
pp. 1523
Author(s):  
Chaiyong Soemphol ◽  
Niwat Angkawisittpan
Keyword(s):  
Low Cost ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Transmission Band ◽  
Dipole Antenna ◽  
Ultra Wideband ◽  
Uwb Antenna ◽  
Wideband Antenna ◽  
Directional Radiation ◽  
Good Agreement

<span>A coplanar waveguide</span><em></em><span>fed ultra-wideband antenna with extended transmission band to WLAN frequency is investigated. The proposed antenna consists of a modified </span><span>semi-</span><span>circular patch and staircase of ground plane. The prototype is fabricated on a low cost FR4 substrate with dielectric constant of 4.4</span><span> with thicknes of 0.8 mm. The overall dimensions of proposed UWB antenna are </span><span>34 mm x 40 mm. The simulation and experimental results have been shown that the proposed antenna archives low VSWR over transmission bandwidth from 2.10 - 12.7 GHz to cover both WLAN and UWB bands.  The average gain is 3.87 dBi. It depicts nearly omni-directional radiation pattern like dipole antenna. Moreover, the fabricated prototype antenna shows a good agreement between the simulated and measured results</span>

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