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Article
Publication date: 25 January 2021

Preeti Pannu and Devendra Kumar Sharma

This paper aims to design a most demanding low profile and compact ultra-wide band (UWB) antenna system for various wireless applications. The performance (in terms of…

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Abstract

Purpose

This paper aims to design a most demanding low profile and compact ultra-wide band (UWB) antenna system for various wireless applications. The performance (in terms of data rate) of UWB system is improved by using multiple-input-multiple-output (MIMO) technology with it. Owing to the overlap of other existing licensed bands with that of UWB, electromagnetic signals can interfere. So, notched band UWB MIMO antenna system reported here which is highly compact, bandwidth efficient, superior data rate and high inter-element isolation comparatively to other reported designs.

Design/methodology/approach

A 49 × 49 × 1.6 mm3 quad-port UWB MIMO antenna with specific bandwidth elimination property is designed. The proposed planar MIMO configuration comprises unique four identical “Cordate-shaped” monopole radiators fed by 2.3-mm thick microstrip-lines. The radiators are located right-angled to each other to enhance inter-element isolation. Further, a different approach of slitted-substrate is applied to minimize the overall size and mutual coupling of the MIMO antenna, as a substitute of decoupling and matching structures. The defected ground structure is used to obtain −10 dB impedance bandwidth in entire UWB band, without compromising with the lower cut-off frequency response. Further, to eliminate the undesired resonant band (WLAN at 5.5 GHz) from UWB, a rounded split ring resonator is introduced in monopole patch.

Findings

In the entire operating band of 2.8 to 11 GHz, isolation among elements is more than 24 dB, envelope correlation coefficient less than 0.002, diversity gain greater than 9.99 dB and TARC less than −7 dB are obtained at all 4-ports.

Research limitations/implications

The measured parameters of the fabricated prototype antenna on FR4 substrate are found in good agreement with the simulated results. The small variation in software results and hardware results are observed due to hardware design limitations.

Practical implications

The proposed design may be used for any wireless application following in the range of UWB.

Originality/value

It can be shown from graphs of measured parameters of the fabricated prototype antenna. They found to be in good agreement with the simulated results.

Details

World Journal of Engineering, vol. 18 no. 3
Type: Research Article
ISSN: 1708-5284

Keywords

Article
Publication date: 3 December 2020

Shweta Suri, Deepika Kathuria, Anusha Mishra and Rajan Sharma

The purpose of this paper is to highlight the biological activities of low-calorie natural sweetener, i.e. monk fruit (Siraitia grosvenorii), which are associated with its…

Abstract

Purpose

The purpose of this paper is to highlight the biological activities of low-calorie natural sweetener, i.e. monk fruit (Siraitia grosvenorii), which are associated with its bioactive constituents.

Design/methodology/approach

Recent investigations focused on biochemical characterization and nutraceutical potential of monk fruit (traditional Chinese perennial vine) have been critically reviewed. Also, the safety and influence of monk fruit on organoleptic characteristics of prepared food products have been documented.

Findings

Biochemistry of monk fruit revealed that mogrosides are the principal compounds responsible for the high-intensity sweetness in the monk fruit. The fruit induces several biological activities including anti-oxidative effect, hypoglycemic response, anti-allergic properties, anti-carcinogenic and anti-tissue damage activities. Attributing to great potential as a bio-functional sweetener in food products, monk fruit extract has been approved as Generally Regarded as Safe.

Originality/value

This paper highlights the biological potential of monk fruit opening the doors to future investigations for its utilization in products of commercial importance including food and pharmaceutical preparations.

Details

Nutrition & Food Science , vol. 51 no. 6
Type: Research Article
ISSN: 0034-6659

Keywords

Article
Publication date: 1 February 1986

Richard A. Gray

While granting Cowper the full poetic license he is entitled to, prosaically I must observe that it is not the syllables but rather the philogists who pant. They do indeed…

Abstract

While granting Cowper the full poetic license he is entitled to, prosaically I must observe that it is not the syllables but rather the philogists who pant. They do indeed breathe rapidly in short gasps after they have established each successively deeper level of root connection in pursuit of the etymological purpose of delineating the origin and historical development of words, or of providing an account of any given word. Etymology as so defined I will designate analytic etymology and distinguish from another form of word study, which I shall call reconstructive etymology.

Details

Reference Services Review, vol. 14 no. 2
Type: Research Article
ISSN: 0090-7324

Article
Publication date: 8 May 2009

Stefano Caneppele, Francesco Calderoni and Sara Martocchia

The paper aims at expanding knowledge on the presence of organized criminal groups in public contract procurement in the south of Italy. It seeks to highlight how the…

Abstract

Purpose

The paper aims at expanding knowledge on the presence of organized criminal groups in public contract procurement in the south of Italy. It seeks to highlight how the capabilities of law enforcement agencies could be enhanced by means of criminological models.

Design/methodology/approach

The paper sets out a criminological model with which to assess the general and specific risks of the infiltration of public procurement in the south of Italy by organized crime (OC).

Findings

According to the geographical risk assessment, infiltration by OC of public procurement seems to be widespread in some areas of south Italy, especially Sicily, Calabria and Campania. On the other hand, the specific risk may increase according to certain features of the company and its representatives, the value of the contract, the low specialization of the activities required by the public contract.

Originality/value

The paper describes a criminological model with which to assess the general and specific risk of infiltration by OC of public procurement in south Italy.

Details

Journal of Money Laundering Control, vol. 12 no. 2
Type: Research Article
ISSN: 1368-5201

Keywords

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