Indranil Acharya

DGS & DMS based hexagonal fractal antenna for UWB applications

In this paper a hexagonal shaped fractal monopole antenna is thoroughly investigated for UWB applications. The antenna is mounted on FR4 dielectric substrate and is fed by a 50 ohm microstrip feed line. Basically DGS and DMS structures are introduced to obtain multiband characteristics in UWB frequency range. The simulated results show stable radiation patterns and good return loss of less than -10 dB in the frequency range of 2.7-9.2 GHz. Each and every modification in the basic structure is supplemented with sufficient simulations and explanation to consolidate the results.

A Novel Circular Monopole Fractal Antenna for Bluetooth and UWB Applications with Subsequent Increase in Gain Using Frequency Selective Surfaces

In this paper a novel monopole circular fractal disk is analyzed in details. The antenna is mounted on a FR4 substrate having a dimension of 30 × 35 mm2. A 50 Ω impedance matched microstrip line is used as feeding mechanism for the antenna. The antenna exhibits stable radiation patterns and has a bandwidth of 9.64 GHz. A U-shaped slot having appropriate dimensions is etched from the patch in order to make the antenna compatible for Bluetooth applications. In the later section, different types of Frequency Selective Structures (FSS) are introduced for enhancing the gain of the antenna. A gain of 8.94 dB is observed with the introduction of slot type FSS structures beneath the ground plane. All the analysis of the antenna is done in HFSS 2013.

A novel microstrip fed circular patch antenna with band notches for Bluetooth/UWB/X-band and Ku band applications

In this paper a novel microstrip fed circular patch antenna is analyzed in details for applications in Bluetooth, UWB, X-band and Ku band respectively. The basic antenna structure is a circular patch which is modified by adding complementary circular split ring resonators and T strip connected to the top of the patch. The antenna is fed by a 50 ohm microstrip feed line. A slot of dimension 2×3.6 mm2 is inserted in the ground plane which consists of a staircase structure having appropriate dimensions. The ground is later modified with meander shaped slots for Bluetooth, X band and Ku band applications. The characteristics of the proposed antenna is carried out in HFSS 2013.

Gain enhancement of MEMS helix antenna using double substrate and fractal structures

This paper is concerned with the design of a novel MEMS helical antenna that is mainly incorporated for Terahertz (THz) applications. The antenna comprises of a metal helix and a CPW feed on the substrate. The antenna can be fabricated using only one wafer and it has high packaging density. For THz applications the antenna parameters has been optimised so that desired performance can be achieved. Moreover low fabrication cost makes this antenna suitable for terahertz systems.

A novel hexagonal antenna with L-strip proximity gap coupling for 2.4 GHz and WiMAX applications

In this paper, a novel L-strip fed hexagonal patch antenna is analyzed. Various antenna parameters such as the return loss and gain is studied. The antenna exhibits sharp resonance at 2.4 GHz with a return loss value of -17.83 dB. In order to ensue additional modes for WiMAX applications, fractal structures are placed in close proximity to the L-strip feed line. Additional resonance modes are observed at 3.55 GHz having return loss value of -13.15 dB and at 4.05 GHz with return loss of -10.29 dB. Defective ground structures are incorporated in the ground to attenuate the higher order modes. All the analysis of the proposed antenna is carried out in HFSS 2014.

A novel modified star fractal monopole antenna for UWB applications

In this paper, two novel star shaped fractal monopole antenna with circular and hexagon slots and semi-elliptical ground are presented for ultra-wideband applications. The designed antennas have a compact dimension of 20 × 21 × 1 mm3. A 50 ohm impedance matched microstrip feed line having width 1.9 mm is used to excite both the antennas. A wide bandwidth of 8.67 GHz is obtained starting from 4.4 GHz to 13.07 GHz with a consistent VSWR < 2 in case of a circular slot in the patch. In case of the second designed antenna with hexagonal slot in the patch, a further increase in bandwidth is obtained, having a value of 13.67 GHz in the frequency range of 4.57 GHz to 18.24 GHz. All the analysis is carried out in HFSS 2014.

Effect of Triangular Split Ring Resonator and Modified Mushroom EBG Loaded Substrates on a simple planar monopole microstrip patch antenna

In this paper a simple microstrip patch antenna of dimension 28 x 45 mm2 is investigated in details. Two dielectric substrates each having dielectric constant 2.2 and thickness 0.3935 mm is used thereby giving a total substrate height of 0.787 mm. A wide bandwidth of 3.76 GHz and gain of 1.32 dB is achieved. The gain of the antenna is improved in the later section of the paper by employing air substrate, triangular split ring resonators (TSRR) and modified mushroom shaped electromagnetic band gap (EBG) structures loaded in the substrate. All the analysis of the antenna is done in HFSS 14.

FSS reflector surface for gain enhancement of a monopole slot antenna

In this paper a circular patch antenna with a slot is investigated in details for ultra wideband application. A 50 ohm microstrip feed line is used for exciting the antenna. The antenna resonates at multiple frequencies of 4.8 GHz, 5.5 GHz, 9 GHz and 12 GHz respectively with a bandwidth of 2 GHz and 5.2 GHz and can be effectively utilised for several wireless as well as X-band applications. The gain of the antenna is later enhanced using Frequency Selective Surface (FSS) which acts as a reflector placed underneath the antenna at optimum distance. All the necessary simulations has been performed in HFSS 2013.

Different techniques for creating notches in a planar monopole UWB antenna

In this paper, a compact printed monopole UWB antenna is presented, followed by various techniques for creating stop bands in order to mitigate interference between co-existing UWB systems. The antenna consists of a two-step beveled radiating patch and a reduced ground plane which accounts for good impedance matching from 3.1 GHz to 10.6 GHz. A wide bandwidth of 8.7 GHz is obtained between 3.5 GHz to 12.2 GHz. A comparative analysis is presented by etching out slots of various shapes near the feed line in order to effectively reject WLAN frequencies (5.15-5.35/5.725-5.8825 GHz). All the analysis for the proposed antenna is done in HFSS 2014.

A novel multiband modified fractal antenna for wireless applications

In this paper, a modified fractal Sierpinski Antenna is proposed for wireless applications. The antenna under investigation is fed by a 50 ohm microstrip line. The basic shape of the fractal antenna is a triangle which is modified with a hexagon slot and iteration of self similar design. Wide bandwidth of 3.05 GHz and 2.4 GHz is obtained between 2.85-5.9 GHz and 9.5-11.9 GHz respectively. Various parameters of the proposed antenna is studied thoroughly and presented in the paper.