| 1. |
- Ahmad, Ashfaq, et al.
(author)
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Design, Fabrication, and Measurements of Extended L-Shaped Multiband Antenna for Wireless Applications
- 2018
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In: Applied Computational Electromagnetics Society Journal. - : Applied Computational Electromagnetics Society (ACES). - 1054-4887. ; 33:4, s. 388-393
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Journal article (peer-reviewed)abstract
- This article expounds a multi-band compact shaped antenna, which is based on CPW ground plane. FR-4 with a thickness of 1.6 mm is used as a substrate for the proposed antenna. The proposed antenna is capable of operating at 1.56 GHz for (Global Positioning System), 2.45 GHz (Wireless Local Area Network) and 4.49 GHz (Aeronautical Mobile Telemetry (AMT) fixed services). The efficiency at 1.56, 2.45, and 4.49 GHz is 79.7, 76.9 and 76.7%, respectively. The VSWR of the presented antenna is less than 1.5 at all the desired resonance modes, which confirms its good impedance matching. The performance of the proposed antenna is evaluated in terms of VSWR, return loss, radiation pattern and efficiency. CST (R) MWS (R) software is used for simulations. In order to validate the simulation results, a prototype of the designed antenna is fabricated and a good agreement is found between the simulated and measured results.
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| 2. |
- Ahmad, Ashfaq, et al.
(author)
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Flexible and Compact Spiral-Shaped Frequency Reconfigurable Antenna for Wireless Applications
- 2020
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In: IETE Journal of Research. - : TAYLOR & FRANCIS LTD. - 0377-2063 .- 0974-780X. ; 66:1, s. 22-29
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Journal article (peer-reviewed)abstract
- A flexible, spiral-shaped frequency reconfigurable antenna with a compact size (20 x 24 mm(2)) is presented. The proposed antenna has a low-profile planar structure and is able to operate at five different frequency bands, i.e., 4.19-4.48, 5.98-6.4, 3.42-4.0, 5.4-5.68, and 6.8-7.0 GHz. The multiband operation enables the antenna to cover aeronautical radio navigation, fixed satellite communication, WLAN, and WiMAX standards. A radiating element is backed by Rogers (R) 5880 substrate with a thickness of 0.508 mm and dielectric constant of 2.2. The spiral shape is achieved by introducing different strips. Frequency reconfiguration is achieved by the incorporation of a lumped element in a strip, so that the antenna can switch between different resonances. To validate the performance of the antenna, the prototype of the design was fabricated and tested. Good acquiescent is seen between simulated and measured results. The proposed antenna operates efficiently with appreciable return loss, directivity, bandwidth, and peak gain.
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| 3. |
- Akhtar, Faiza, et al.
(author)
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A Flexible and Compact Semicircular Antenna for Multiple Wireless Communication Applications
- 2018
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In: Radioengineering. - : SPOLECNOST PRO RADIOELEKTRONICKE INZENYRSTVI. - 1210-2512 .- 1805-9600. ; 27:3, s. 671-678
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Journal article (peer-reviewed)abstract
- This work presents a compact, quad-band planar antenna intended for assimilation into flexible and conformal devices. The CPW-fed semicircular shaped prototype with rake-shaped slots is designed, realized and characterized experimentally. The frequency bands covered by the proposed radiator are centered at 2.5, 3.7, 5.5 and 8 GHz with measured impedance bandwidths of 16%, 13.5%, 11.8% and 14.63%, respectively. The proposed antenna is thus enabled to support WLAN, ISM, Bluetooth, WiMAX LTE and X-band applications. The antenna exhibits a significant gain. The radiation characteristics of the proposed radiator are measured in concave and convex bent shapes at various radii to analyze its flexibility. Performance of the antenna remains almost unaffected in the bent situation. Measurements demonstrate good coherence with simulations. The compactness and good performance of the design both in bent and unbent conditions proves it to be the better contender for future multiband conformal wireless applications.
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| 4. |
- Ali, Amjad, et al.
(author)
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RFID Humidity Sensor Tag for Low-cost Applications
- 2017
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In: APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL. - : APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC. - 1054-4887. ; 32:12, s. 1083-1088
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Journal article (peer-reviewed)abstract
- This article presents a low-cost, flexible, chipless Radio Frequency Identification (RFID) tag for humidity monitoring applications. The tag exhibits moisture sensing feature within a compact geometrical dimension of 20mm x 17.6mm. The design is loaded with 12 resonators, where each resonator represents 1 bit in the frequency domain. For the designed 12-bit tag, 11 inverted C-shaped resonators are dedicated for encoding 11-bit information in their spectral signature. An integrated meandered-shaped resonator, covered with moisture sensitive Kapton (R) HN film, functions as a 1-bit moisture sensor. It is deployed for monitoring relative humidity (RH) levels, simultaneously. The passive RFID tag is realized on Taconic TLX-0 and has an operational bandwidth of 2.62 GHz. Furthermore, the design is modeled and analyzed for multiple substrates. The performance of the sensor tag for various humidity levels indicates that it is a potential solution for inexpensive sensing applications.
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| 5. |
- Amin, Yasar, et al.
(author)
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Blueprint and integration of vastly efficient 802.11A WLAN front-end
- 2006
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In: WSEAS Transactions on Electronics. - 1109-9445. ; 3:4, s. 258-261
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Journal article (peer-reviewed)abstract
- Next generation wireless communications terminals will demand the use of advanced component integration processes and high density packaging technologies in order to reduce size and to increase performance. This paper presents high density multilayer interconnects and integrated passives used to design high performance prototype filter for 5GHz wireless LAN receiver realized on MCM-D substrate. The thin film implementation of Multichip Module technology is identified as a useful platform for the integration of GaAs MMIC and silicon device technologies for microwave applications where performance, size and weight are critical factors. The ability of the MCM-D technology to provide controlled impedance, microstrip structures and integrated thin film passive components with useful performance in the microwave frequency regime has now been demonstrated.
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| 6. |
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| 7. |
- Amin, Yasar, et al.
(author)
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Design and Analysis of Efficient and Compact Antenna for Paper Based UHF RFID Tags
- 2008
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In: ISAPE 2008. - NEW YORK : IEEE. - 9781424421923 ; , s. 62-65
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Conference paper (peer-reviewed)abstract
- Paper substrate is one of the paramount nominees for Radio Frequency Identification (RFID) tags but at the same time it is extremely prone towards environmental changes. In this paper, antennas for UHF RFID tags on paper based substrate are investigated and analyzed for the first time to evaluate the effect of change in dielectric constant on the antenna parameters and performance. On the basis of analysis a concrete meander line antenna is proposed, designed and evaluated which has tremendous immunity towards variation in dielectric constant.
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| 8. |
- Amin, Yasar, et al.
(author)
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Design and Characterization of Efficient Flexible UHF RFID Tag Antennas
- 2009
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In: 2009 3RD EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION. - NEW YORK : IEEE. - 9781424447534 ; , s. 2682-2684
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Conference paper (peer-reviewed)abstract
- In this paper meander line antennas with end tip loading, designed for UHF RFID tags are presented. These novel antennas are screen printed on Kapton HN for European frequency band (866-868 MHz) and for North American frequency band (902-928 MHz). Asahi ink is used for screen printing of 25 mu m thick antenna traces which remains conductive even after several times sharp bending of these tag antennas. The results show that the antennas exhibit high performance regarding smaller area, high realized gain and better return loss in the frequency band of interest. These antennas are extremely flexible which give autonomy for their applications.
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| 9. |
- Amin, Yasar, et al.
(author)
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Design and Fabrication of Wideband Archimedean Spiral Antenna Based Ultra-Low Cost "Green" Modules for RFID Sensing and Wireless Applications
- 2012
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In: Progress In Electromagnetics Research-PIER. - 1559-8985. ; 130, s. 241-256
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Journal article (peer-reviewed)abstract
- A parametric analysis is performed for a wideband Archimedean spiral antenna in recognition of an emerging concept to integrate RFID along with several applications by using a single antenna. The antenna is fabricated using state-of-the-art inkjet printing technology on various commercially available paper substrates to provide the low-cost, flexible RF modules for the next generation of "green" electronics. The effects on electromagnetic characteristics of the planar Archimedean spiral antenna, due to the use of paper are investigated besides other parameters. The proposed antenna is evaluated and optimized for operational range from 0.8-3.0GHz. It exhibits exceptional coverage throughout numerous RFID ISM bands so do for other wireless applications.
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| 10. |
- Amin, Yasar, et al.
(author)
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Design of Novel Paper-based Inkjet Printed Rounded Corner Bowtie Antenna for RFID Applications
- 2010
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In: Sensors & Transducers Journal. - : International Frequency Sensor Association (IFSA). - 2306-8515 .- 1726-5479. ; 115:4, s. 160-167
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Journal article (peer-reviewed)abstract
- This paper presents a novel inkjet printed rounded corner bowtie antenna with T-matching stubs on paper substrate which is the cheapest and widest available substrate. The antenna exhibits compact size with outstanding read range and complete coverage of UHF RFID band (860-960 MHz). The results show extreme immunity of proposed antenna against paper dielectric constant variation.
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