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This paper describes the design and fabrication of circularly polarized wideband textile antenna resonating at 2.4 GHz and 5.8 GHz ISM bands. The textile antenna that is designed for wireless body centric communications should be low profile, light weight, comfortable against skin and unobtrusive to be worn so that it can be easily accepted by the general public. With the advent and easy availability...
This paper proposes an efficient bank of filters derived from variable bandwidth filter structure, for audiogram matching in a digital hearing aid. The variable bandwidth filter is designed using Farrow structure, for lower hardware complexity. The magnitude and band edge frequencies of the filters are independently adjustable which allows this arrangement to successfully fit a given audiogram with...
A lot of effort has been devoted to the design of uniform and non-uniform filter banks for hearing aid applications. But in most of the cases, it never deals with large variation of hearing losses at mid frequencies. This paper presents a low complex design of a non-uniformly spaced digital finite impulse response (FIR) filter bank for digital hearing aid application. Frequency response masking (FRM)...
A novel ‘I’ shape with vertical slot defected ground structure (DGS) antenna using Multiple Input Multiple Output (MIMO) for wireless application is proposed for 5.8 GHz frequency band. MIMO antenna consists of two symmetrical antenna elements fed with inset feeding technique. Ground plane of both the antenna made defective by using ‘I’ shape supporting with vertical slots. DGS is introduced to improve...
In this paper a summary is given of the ongoing research work at Vikram Sarabhai Space Centre, Trivandrum on Wireless Instrumentation System (WIS) for Satellite Launch Vehicle applications. WIS is based on the physical layer (PHY) of IEEE802.15.4, Low Rate Wireless Personal Area Networks Standard (WPAN). However the researchers have pointed out the unsuitability of available 802.15.4 standard in terms...
This paper proposes a compact polygon shaped split ring monopole antenna (SRMA) for 2.4/5.0/5.9/7.0 GHz WLAN/WAVE/ITU band applications. The single ring polygon split ring resonator (SRR) structure makes the antenna design simple and compact compared with conventional dual ring SRRs. A wideband behavior is achieved in the upper frequency band by the use of multiple similar edges of polygon and the...
A miniaturized CPW-fed dodecagram fractal antenna is designed for multiband applications having multiple resonant frequencies. The antenna is designed by a combination of two geometries, do-decagram and a circle within. This is resulted in improved radiation pattern, a good gain and higher efficiency with multiple resonances in useful frequency bands. The use of defected ground structure (DGS) and...
This paper presents the stability investigation of Internal Model Control (IMC) based control design of doubly-fed induction generator (DFIG) in Stator-Voltage-oriented (SVO) synchronous reference frame. The state-space model of DFIG including inner current closed loop dynamics with different feedforward compensation schemes is developed. The inner current loop dynamics is usually ignored when SVO...
In this paper, a new method of image segmentation by histogram thresholding based on the concept of fuzzy measure minimization is suggested. The concept introduced here, uses extreme value type-1 distribution (Gumbel distribution) in order to define the membership function. The membership function is used to express the unique association between a pixel and its belonging region (the object or the...
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