Farhadur Arifin

Design and evaluation of a novel octagonal UWB wearable textile antenna under different bending conditions

In this paper a novel Ultra Wide Band textile antenna is designed which operates from 2.6-14 GHz, covering entire Ultra Wide Band frequency range of 3.1-10.6 GHz, as approved by FCC. The proposed antenna consists of a octagonal patch and a partial ground plane with a square notch. The substrate of the designed antenna is made of Dacron fabric (εr=3) while patch and ground is made of copper tape. The dimension of the substrate is 43×34 mm2. Simulated results of different antenna parameters such as return loss (S11), gain and radiation patterns are presented. This antenna performance are also analysed at four different bending angles. The characteristics, low profile and compact size of the proposed antenna depicts as a potential candidate for UWB applications. The antenna design details and simulated results are presented by CST microwave studio.

FPGA implementation of an invasive computing architecture

Invasive computing is a novel paradigm for exploitation of run-time parallelism of future MPSoC architectures through resource-aware programming and dynamic reconfiguration of the underlying architectures. Based on the state and availability of resources, an invasive algorithm organizes its computation itself. This paper presents a general methodology for mapping invasive algorithms to FPGA-based dynamically reconfigurable architectures. A detailed description of a general invasive architecture on a reconfigurable platform is given. For 1D linear processor architectures, the applicability of this concept is tested and results show substantial flexibility gains with only marginal additional hardware cost.

Design and evaluation of a UWB wearable textile antenna for body area network

This paper presents a novel Ultra Wide Band (UWB) wearable textile antenna for body area networks. The proposed antenna consists of a hexagonal radiating patch and a partial ground plane. The substrate of the proposed antenna is made of Dacron fabric with permittivity 3. Ultra wide bandwidth is achieved by optimizing the geometry, introducing a square notch in the partial ground plane and introducing novel slot pattern on the radiating patch of the antenna. This novel slot represents the “wireless antenna” icon. The dimension of the proposed antenna substrate is 40×34×1.7 mm3 and the bandwidth 16.56 GHz starting from 2.6 GHz to 19.16 GHz for return loss less than -10 dB. The gain variation is from 2 dB to 6.35 dB and average total efficiency more than 83%. Maximum power of 17.39 mW may be set as input to the proposed antenna in order to guarantee compliance with the IEEE C95.1-1999 safety standard. The proposed antenna design details and simulated results are presented by Commercial electromagnetic simulation package CST Microwave Studio.

FSM-controlled architectures for linear invasion

Invasive computing is a novel concept in multiprocessor architecture and programming. Invasion will become an important step towards self-organizing behavior which will be needed in the next generation of massively parallel MPSoCs with unrivaled performance and resource efficiency numbers as one of the main challenges for MPSoC apart from their programming. In this paper we introduce and model a finite state machine for controlling the invasive process in different architectural granularities. The applicability of our FSM is tested in case studies for a reconfigurable MPSoC platform and a fine-grained platform. The results show substantial flexibility gains with only marginal additional hardware cost.

Extended UWB wearable logo textile antenna for body area network applications

In this paper, a novel extended Ultra Wide Band (UWB) wearable logo-type textile antenna for body area network applications is presented. The substrate of the proposed antenna is made of Fleece fabric with permittivity 1.17. The proposed antenna comprises of a hexagonal radiating patch and a partial ground plane. Ultra wide bandwidth is attained by optimizing the geometry, introducing a square notch in the partial ground plane and introducing novel slot pattern on the radiating patch of the antenna. This novel slot represents the logo of authors department name “Electrical and Electronic Engineering (EEE)”. The dimension of the proposed antenna is 38 × 32 × 2.05 mm3 and the bandwidth is 27 GHz starting from 2.85 GHz to 29.85 GHz for return loss less than -10 dB. The gain variation is less than 4.5 dBi and average total efficiency more than 93%. The proposed antenna design details and simulated results are presented by the Commercial electromagnetic simulation package CST Microwave Studio.

A novel UWB wearable icon-type textile antenna for WBAN applications

A novel Ultra Wideband (UWB) wearable textile icon-type antenna is presented for WBAN applications. It comprises of radiating patch which is hexagonal in shape and partial ground plane. The design geometry is optimized to attain wider bandwidth in the UWB frequency ranges. Square shaped notch is introduced on the ground and unique slots on radiator are also introduced. Entire slots represent the “Power” icon. The proposed antenna dimension is 40 × 34 × 2.7 mm3 which cover bandwidth of 16.86 GHz. The proposed antenna performances are analyzed by Computer Simulation Technology (CST).

Performance analysis of a miniaturized implantable PIFA antenna for WBAN at ISM band

A flexible implantable PIFA (Planar Inverted F Antenna) antenna for biomedical applications is proposed in this study. The main notability of this design refers to its subtle dimension, flexibility and subordinate thickness that makes it perfectly suitable for implementing inside human or animal tissues. The antenna is aimed to operate in the Industrial, Scientific and Medical (ISM) band (2.4–2.4835 GHz). The thickness of this antenna is only .735 mm, which implies that this antenna is reliable to perform under bent conditions. The antenna offers a compact design with a dimension of 9.48 mm × 7.8 mm × .735 mm (54.348 mm3). Copper and Rogers R03010 are chosen as the patch material and substrate material accordingly. The antenna is encapsulated inside biocompatible material Rogers R03010 for safety concern in skin or muscle tissues. Several types of calculations and performance measurement of this antenna have been done by using CST Microwave studio in both planar and bent conditions by maintaining all the electrical properties of human skin tissue. Finally, Specific Absorption Rate (SAR) and thermal loss are evaluated to comply with the antenna safety issues.

Bandwidth enhancement of a compact planar antenna for Wireless Capsule Endoscopy

Antennas are important components of Wireless Capsule Endoscope (WCE) that has been explored due to its non-invasive nature compare to the traditional endoscopy. The main challenges of these antennas include data rate of the telemetry system, miniaturizing the capsule, propagating efficiency of the antenna in the vicinity of human body. In this paper, a miniature Ultra-wideband (UWB) antenna is proposed and evaluated for WCE applications. The proposed antenna consists of slotted circular radiating patch having a sawtooth partial ground plane with 50 Ohm microstrip feed line. The substrate of the proposed antenna is chosen as Roger R03010. The bandwidth enhancement is achieved by proper selection of dimensions and positions of slots on the radiating patch and introducing a sawtooth partial ground plane. The in-body performances of the antenna are investigated inside a homogeneous human muscle layer. The antenna is able to achieve an impedance bandwidth of 1.84 GHz from 4.6554 GHz to 6.4953 GHz for return loss less than −10 dB with Omni-directional pattern. Maximum power of 44.2051 mW can be set as input to the proposed antenna in order to comply with the IEEE C95.1-2005 safety standards.

Implimentation and evaluation of an efficient clock distribution network for deep-submicron technology

A differential clock distribution network using current mode logic (CML) buffer and RCL interconnect model for low-skew is presented in this paper. We investigate attenuation and skew of the proposed clock distribution network. An efficient differential CML buffer is used as it is capable of operating with low voltage and high frequency which makes this clock distribution network more advantageous over the conventional models. Different clock distribution networks with clock trees such as H-tree, X-tree and binary tree are designed. Those networks are analyzed by using different technological nodes, such as 22nm, 32nm, 45nm. Due to the high clock frequency, more accurate RCL interconnect model has been explored. According to the analysis, compared to other clock trees, X-tree has less skew of 179ps with large area and the binary tree has a constant delay ratio.

Design of a miniaturized UWB ingestible antenna for Wireless Capsule Endoscopy

In recent years, non-invasive Wireless Capsule Endoscope (WCE) has been explored extensively for the diagnosis of GI tract diseases. However the application of WCE is limited due to capsule size, propagating efficiency of the antenna, reducing effects on the human body and the data rate of the telemetry system. In this paper a miniature Ultra-wideband (UWB) antenna is designed for WCE by exploiting several miniaturization techniques such as using high-permittivity dielectric substrate and lengthening of the current flow path on the patch surface. The volume of the optimized antenna is only 81 mm3. The performances of the antenna are investigated inside a homogeneous human muscle layer. The proposed antenna resonates at 8.36 GHz with a wide -10 dB bandwidth of 500 MHz. Maximum power of 21.115 mW can be set as input to the proposed antenna in order to comply with the IEEE C95.1-1999 safety standards.