Lenin Naragani

• Master of Engineering (Microwave & Radar)
• Researcher at Defence Research and Development Organisation

The rapid progress in wireless communication systems in which required operation of multimode mobile terminals has been growing constantly in recent years. Nowadays handheld terminal phones use various cellular bands (GSM 850 / 900 / 1800 / 1900 + 3G/4G/5G), wireless LAN, Bluetooth, Digital Television (DVB - H), FM radio, GPS, RFID, UWB, and WiMAX....

This paper presents development of a new planar spiral feed for a satellite boresight reference antenna, operating at two widely separated frequency bands (2200-2300 MHz and 8000-8400 MHz). A stepped ground plane cavity with different quarter wavelength distances is proposed to provide unidirectional patterns at these frequency bands. A back lobe s...

A novel high gain printed dipole array antenna for omni directional coverage is presented. The dipoles are electromagnetically fed by planar slots, formed on a 50 Ω microstrip transmission line. The impedance characteristics and radiation patterns of the antenna are analyzed numerically with finite element method and compared with the measurement....

This article describes a folded planar rectangular monopole antenna, which has reasonably low profile and extremely wide impedance bandwidth. A simple formula is also suggested to determine the frequency of the operation of planar structures, in general. Details of the experimental and simulation results for the proposed antenna are examined and an...

An ultra wideband printed planar elliptical monopole is reported. The antenna has a simple printed structure, mounted perpendicular to a small metallic ground plane. The proposed antenna can be used for multiband operation, with omnidirectional radiation pattern in azimuth plane. The antenna operates over an extremely wide impedance bandwidth of mo...

A printed square slot loop antenna capable of radiating slant 45-degree polarized signals over a wideband is presented. A radial wideband stub feeds the square slot loop at the diagonal and the antenna exhibits an impedance and radiation bandwidth of more than octaveband (1.7 to 3.5 GHz). © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49...

A new ultrawideband, sleeved transmission line- fed rectangular planar disc monopole antenna with a considerably small ground plane size is presented. Experiments have been carried out to investigate the impedance and radiation behavior of the antenna and the results are compared with the numerically simulated data. The antenna offers an ultrabroad...

This correspondence presents a top loaded dual sleeve antenna with a substantially small ground plane for broad band applications. The impedance and radiation properties of the monopole were investigated numerically and experimentally. The antenna features excellent radiation characteristics within a broad impedance bandwidth of 4.2:1, covering 0.5...

A stubloaded reflectarray antenna, which combines the features of conventional parabolic reflector and planar microstrip patch array, is presented. Equiphase distribution at the aperture of the reflectarray is realized by adding stubs of appropriate lengths at each element. A reflectarray of 10�?10 elements designed at 10 GHz exhibiting a gain of 2...

A suspended plate antenna with a novel offset feeding is presented. Broadband operation is achieved by loading 50 ohm transmission line feed with microstrip loop. An impedance bandwidth of 30% for VSWR<2 is obtained over 1.45 to 2.0 GHz. Finite element simulations have been used in designing and optimizing the antenna.

This paper presents the measured reflected phase-variation curves for microstrip-patch elements of variable size, which form the most essential part in the design of a reflectarray antenna. A waveguide simulator exploiting the concept of infinite array is successfully implemented in the characterization of reflected phase, which avoids the need for...

A broadband square slot loop antenna fed by a printed radial stub feed is presented. With this feeding technique an impedance bandwidth of 62% for VSWR<2 is achieved. The antenna operates over a frequency range of 1.58 to 2.78 GHz. Finite element method simulations have been used in designing and optimizing the antenna