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A dual-band textile Artificial Magnetic Conductor (AMC) sheet-like waveguide with two single-band textile diamond dipole antennas made of fleece fabric have been designed and presented in the report. The AMC structure is designed to have zero reflection phase at 2.45 GHz and 5.8 GHz with the aim to improve the transmission between antennas. The performances of two antennas with textile AMC sheet have...
This paper presents the design, simulation, fabrication, and measurement of dual-directional polarization insensitive multiband metamaterial absorber (MMAbs). The MMAbs is designed at three resonating frequency in X-band. The structure of MMAbs consists of two-layers 0.8 mm-thick FR4 substrate with three concentric copper rings-shaped structures at different radius printed on the top and bottom surface...
Frequency reconfigurable square ring slot antenna is presented. The designed antenna comprises of two small rectangular ring slot and a square ring slot fed by a microstrip transmission line. Two switches are placed between the square and rectangular ring slot which provides frequency reconfigurability. The designed antenna is capable of reconfiguring to three frequency bands which at 1.9 GHz, 2.1...
This paper describe the design simulation and fabrication of wideband textile antenna. A rectangular monopole planar antenna with h slot is proposed in this paper. The antenna is made from Fleece fabric as a substrate and Shieldit fabric material as conductive element of the antenna. The optimization of the design has been done using CST Software simulation. The simulated results show that the antenna...
This research identifies and evaluates the effect of human body and conductive metallic objects in the vicinity of radiation source on Specific Absorption Rate (SAR). The presence of electronic devices in the vicinity of human body especially close to the human sensitive part especially when the antenna is left inside the trousers pocket could allow the radiated electromagnetic wave to penetrate inside...
In this paper, dual-port polarization reconfigurable circular patch antenna is proposed. The polarization reconfigurability is achieved by modifying the coplanar waveguide (CPW) slotline feeding network located on the ground plane. Two quarter wavelength phase delays are interconnected on each of the slot lines. Eight switches are placed on the CPW slotline transmission to activate and deactivate...
This paper present the investigation on wearable textile slot antenna under flat and curvature conditions in free space. The antenna can be used for smart clothing at 2.45 GHz Industrial, Scientific and Medical (ISM) band. A 0.78 mm denim fabric is used as the substrate. A monopole antenna is patented on the fabric with a ground plane at the other side. The monopole and the ground is made of a 0.17...
In this paper, the interaction between a single band textile dipole antenna with human body is examined under several bending conditions. The numerical simulations of the single band 0.9 GHz patch dipole antenna are performed by using Computer Simulation Technology (CST) Microwave Studio. The Finite Integration Technique (FIT) method is utilized to determine the antenna performance. Results have clearly...
A wideband metamaterial antenna employing SRR loading is presented. Two designs were simulated, fabricated and measured. The bandwidth enhancement is achieved by loading SRR resonator onto a conventional monopole antenna. The SRR excited a lower resonance frequency mode which matches with the resonance frequency of the monopole antenna thereby extending the overall impedance bandwidth from 26% to...
In this paper, the patch antenna with polarization reconfigurability feature is proposed. The antenna composed of circular patch on the top substrate embedded with four equal-length slits, and is fed at the diagonal of the structure using the coaxial fed technique. To obtain the reconfigurability feature, four switches (copper strips) are appropriately located at the specific position across the slit...
A reconfigurable band notch UWB antenna using EBG structure is proposed. Two EBG structures is positioned alongside the feed line of the UWB antenna. The EBG structures produce two band notched at 3.97 GHz and 5.51 GHz which covers C-band satellite communication system and WLAN. The proposed antenna is suitable for UWB systems that require reconfigurable band reject function.
This paper presents the performances of circular polarization (CP) array textile antenna in different bending condition. The antenna composed four circular patches in array formation where the patches composes a cross slot at the centre of the patch. In flat condition, a good bandwidth (2.06 GHz – 2.49 GHz), axial ratio (2.38 GHz – 2.62 GHz) with realized gain of 3.09 dB is presented and compared...
This paper presents the investigation on material characteristic in gelatin-based phantom, which observed through dielectric measurement that is performed from 1 to 6 GHz. Gelatin and water are used in the investigation. The study focuses on dielectric variation due to the ratio of gelatin and water. The obtained results in this study are useful for the development of realistic human brain phantom.
This paper presents the design of leaf shaped dual band flexible textile antenna. The textile antenna designed at 1.8GHz suitable for Long Term Evolution (LTE) and 2.8GHz WiMAX application. To enhance the flexibility of the proposed antenna and for the comfort of the user, denim textile is used as a substrate material. The conductive copper tape is used as the conducting element. The study also describes...
This paper proposes an antenna with ability to reconfigure the polarization between linear polarization, right-hand circular polarization and left-hand circular polarization through the modification of the feeding network. The antenna consists of circular patch on the upper side of the substrate, and the coplanar waveguide transmission line is placed on the ground plane at the underside of the substrate...
This paper presents the design of dual band polarization insensitive metamaterial absorber at 9 GHz and 10 GHz. The unit cell of the metamaterial consists of four circular rings copper with copper lines printed on 0.8 mm thick FR4 substrate with dielectric constant of 4.6 and loss tangent of 0.019. The simulated result shows that the dual band metamaterial absorber achieves 97.00% and 97.77% for normal...
This paper presents a tunable Artificial Magnetic Conductor (AMC) unit cell design by means of four copper strips. With the inclusion of copper strips, the initial reflection phase of dual band AMC changes from 2.45 GHz and 5.8 GHz to single frequency of 3 GHz. To facilitate the tunable function on antenna performance, an Ultra-Wideband (UWB) antenna has been designed and analyzed. Performance comparison...
This paper presented the investigation of wearable textile slot linear array (TSLA) antenna under flat, curvature and crumple conditions in free space designed for body worn communication application. The antenna substrate is made of 0.78 mm denim fabric with conducting monopole and ground plane is made of 0.17 mm shieldit fabric. The antenna is designed at resonant frequency of 2.45 GHz Industrial...
A composite right‐/left‐handed transmission line metamaterial antenna with enhanced bandwidth and efficiency is proposed. The antenna combines zeroth‐order resonant (ZOR) and positive‐order resonant (POR) modes for the bandwidth enhancement. An asymmetrical coplanar waveguide technique is used to feed the antenna and also to achieve certain degree of compactness. The overall size of the antenna is...
The performance of a compact circular polarization (CP) textile antenna is presented. The design is based on the traditional CP rectangular truncated patch antenna. Four slits are introduced at every edge of the rectangular truncated patch antenna to make it compactness. Simulated results show that the proposed antenna can have an antenna reduction of about 18% compared to the traditional one. A good...
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