University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

In this paper, a new CAD model is proposed to calculate accurate resonant frequencies of inverted microstrip circular patch antennas having a wide range of parameters. This model incorporates all the effects of various dimensions and dielectrics used. Computed results for the first few modes are compared with some new measurements.

Radio Physics and Electronics

Microwave and Optical Technology Letters

New CAD model to calculate the resonant frequency of inverted microstrip circular patch antennas

A novel technique to enhance the bandwidth of an inverted microstrip antenna is presented. Simple design using a circular patch loaded with a capacitive post is described. The new antenna design with a capability loaded inverted microstrip patch shows the possibility of achieving very large impedance bandwidth with satisfactory radiation patterns.

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)

Simple design of a novel broadband antenna: Inverted microstrip patch loaded with a capacitive post

An improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps. Unlike the previous models, the present one is widely applicable to all patch diameters - from very large to very small compared to the height of the dielectric medium below the patch and also to the substrates covering the entire range of dielectric constants. The computed results for different antenna dimensions and modes of resonance are compared with the experimental values.

IEEE Transactions on Antennas and Propagation

Resonant frequency of circular microstrip antennas with and without air gaps

Comments on â€œA New Model for Calculating the Input Impedance of Coax-Fed Circular Microstrip Antennas with and without Air Gapsâ€

A new rectangular waveguide with two L-shaped septa has been added to the family of septa-loaded broad-band waveguides. Its modal characteristics and dispersion in inhomogeneously loaded version have been theoretically determined. The cutoff frequency and the bandwidth of the lowest TE mode are also compared with the experimentally measured values obtained with a test cavity. © 1999 IEEE.

GENERAL

IEEE Transactions on Microwave Theory and Techniques

Bandwidth and dispersion characteristics of a new rectangular waveguide with two L-shaped septa

A single-ridged waveguide with a symmetrical longitudinal trough below the ridge, designated as a ridge-trough waveguide (RTW) has been recently proposed as a wafer probe. The authors have theoretically calculated the cutoff, bandwidth, and impedance characteristics of this modified single-ridged waveguide in two different configurations using the Ritz-Galerkin technique and different domain decompositions. The results indicate that a RTW can be a low impedance broad-band structure. © 1997 IEEE.

Some characteristics of ridge-trough waveguide

A rectangular waveguide with a double L‐shaped septa has recently been proposed as a broadband transmission medium. The effects of the septa dimensions on its characteristics are investigated in this article. Numerical data that would be useful for application of the DLSG have been presented. © 1995 John Wiley & Sons, Inc. Copyright © 1995 Wiley Periodicals, Inc., A Wiley Company

Effects of septa dimensions on some characteristics of double Lâ€septa waveguides

Rectangular waveguides with two L-shaped septa attached to the broad walls in antipodal configuration have been shown theoretically to be an improved variant of the Double T-Septa Guide having larger cut off wavelength and broader bandwidth of the dominant TE mode [9]. Numerical data on the attenuation, impedance and power handling capability of this new type of broadband guides are now presented here as additional design information. © 1993 IEEE

Impedance, Attenuation and Power-Handling Characteristics of Double L-Septa Waveguides

Three types of inhomogeneous Double L-Septa Guides produced by selective dielectric loading of the different regions have been analyzed. The cut off and bandwidth characteristics of these configurations are compared with inhomogeneous T-septa guide and homogeneous DLSG. From the study an optimum configuration with very large bandwidth emerges as a potential structure for practical implementation. © 1992 IEEE

Characteristics of Inhomogeneously Filled Double L-Septa Waveguides

Rectangular waveguides with double L-shaped septa—variants of Double T-Septa Guides (DTSG) [1], [2]—have been analyzed theoretically and are proposed as new broadband waveguides. Results indicate that significant improvement in cutoff wavelength and bandwidth in particular should be available with L-shaped septa in antisymmetric configuration. © 1992 IEEE