Ajay Dadhich

A novel ultra-wide band antenna design using notches and stairs

This paper describes the parametric study of a novel rectangular planar ultra-wide band antenna (UWB). The proposed design exploits U and T-shaped notches with stairs at two corners on the radiating patch along with stepped microstrip feed. The stairs are also used at the corners of the partial ground plane with a rectangular notch and an electromagnetically coupled stepped rectangular strip. The proposed UWB antenna is designed and simulated using Computer Simulation Technology Microwave Studio (CST-MWS). This antenna operates in a frequency band ranging from 3.0985 to 10.666 GHz with the overall dimensions of 34 mm (L), 37.5 mm (W) and 1.7 mm (H). The VSWR is less than 2 for entire operating frequency range. The impedance bandwidth of the proposed design is nearly 7.5675 GHz. This antenna finds its applications in 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX, 4 GHz C band and lower frequencies of X band. The effect of the stepped ground plane and the dimensions of U, T and rectangular shaped notches on the optimization of the return loss is parameterized and discussed in detail.

A dual band star fractal antenna with slot for wireless applications

In this paper a Dual Band Star fractal antenna with slot is proposed for wireless applications, with a semi-elliptical ground plane. The proposed antenna is designed to operate at two different bands having bandwidth 1GHz and 1.2 GHz at resonant frequencies 2.8 GHz and 5.7 GHz respectively for wireless applications with good return loss and radiation pattern characteristics, in the frequency band. The proposed antenna is fed by a 50Ω microstrip line and fabricated on a low-cost FR4 substrate having dimensions 33.5(L) × 28.5(W) × 1.6(h) mm3 with εr and tanδ=0.025. The antenna shows acceptable gain with nearly omni-directional radiation patterns in the frequency band for wireless applications as Wi-MAX and WLAN.

A novel ultra-wide band antenna design using notches, stepped microstrip feed and beveled partial ground with beveled parasitic strip

A novel rectangular planer ultra-wide band antenna (UWB) using one U-shaped and one T-shaped notch with two beveled corners on the radiating patch along with stepped microstrip feed is proposed in this paper. The design also includes beveled partial ground with rectangular notch and a coupled bevel rectangular strip. The proposed UWB antenna is designed and simulated using Computer Simulation Technology Microwave Studio (CST-MWS). The proposed antenna operates in a frequency band ranging from 3.0583 to 10.8333 GHz with the overall dimensions of 34 (L) × 36 (W) × 1.67 (H) mm3. The return loss i.e. VSWR is less than 2 for entire operating frequency range. The impedance bandwidth of the proposed design is nearly 7.775 GHz. This antenna finds its applications in 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX, 4 GHz C band and lower frequencies of X band. The effect of the beveled ground plane and the dimensions of U, T and rectangular shaped notches on the optimization of the return loss is parameterized and discussed in detail.

A novel approach to bandwidth enhancement of multi- fractal antenna

In this paper, a fractal triangular patch design is proposed which is a combination of Koch and Sierpinski techniques. The proposed design will provide contribution to the ultra wide band characteristics. The proposed design used 4.4 relative permittivity thick FR-4 epoxy substrate with dimension 21.45*17.89*1.6 mm3 and partial ground plane. To increase the bandwidth of proposed design, a slot is cut in partial ground plane. This proposed antenna design operates over the frequency range 3.7 GHz-7.56 GHz with return loss -24.25dB and VSWR<;2. Also the bandwidth of proposed antenna is increased up to 67.99%.The radiation pattern of the proposed antenna is Omni-directional in H-plane. The simulation of this antenna is done by High Frequency Structure Simulator.

A Planar Ultra-Wide Band Antenna Design Using Circularly Truncated Corners and Notches

This paper describes the design and parametric study of a planar rectangular ultra-wide band antenna (UWB). The proposed design exploits U-shaped notch and T-shaped slot with circularly truncated corners on the radiating patch along with stepped microstrip feed. Circular truncation is also used at the corners of the partial ground plane with a rectangular notch along with an electromagnetically coupled truncated rectangular strip. This antenna operates in a frequency band ranging from 2.975 to 10.684 GHz with an impedance bandwidth nearly 7.709 GHz. This antenna finds its applications in 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX, 4 GHz C band, and lower frequencies of X band. The effect of the truncated ground plane and the dimensions of U, T and rectangular shaped notches on the optimization of the return loss is parameterized and discussed in detail.

Dual Band/Wide Band Polarization Insensitive Modified Four—Legged Element Frequency Selective Surface for 2.4 GHz Bluetooth, 2.4/5.8 GHz WLAN Applications

In this paper, a modified four-legged element frequency selective surface (FSS) with wide and dual band stop behaviour in two wireless local area network frequencies of 2.4 and 5.8 GHz have been proposed. The proposed design possesses 1050 and 1200 MHz bandwidths with insertion loss −41.45 and −35 dB around the centre operating frequencies 2.4 and 5.8 GHz, respectively. To obtain best characteristics, FSS unit cell has been designed using FR-4 substrate material having dielectric constant 4 and dissipation factor of 0.025. The structure exhibits a dual band from 1.8 to 2.85 GHz for GSM 1800/1900 MHz and Bluetooth and another band is from 5.25 to 6.45 GHz for WLAN for wideband application. It found applications into a number of vertical markets such as retail, warehousing, healthcare, manufacturing, retail and academic.

Dual-Band Rectangular-Shaped Antenna with Sideway Extension at Top and Bottom for WLAN and WiMax Applications

A dual-band rectangular antenna with sideway extension at top and bottom having applications in WLAN and WiMAX is discussed in this paper. The designed antenna composed of a rectangular patch with wider sideway extension at bottom and smaller sideway extension at top. Antenna is designed and simulated using CST microwave studio software. The design parameters are selected to achieve a dual resonance at 5.8 and 3.30 GHz having applications in WLAN and WiMax. The first band (3.30 GHz) is controlled by the upper sideway extension of the antenna while the lower sideway extension controls the second resonating band (5.8 GHz). The simulated results show that the antenna has the bandwidths of 174 MHz (5726–5900 MHz) and 327 MHz (3127–3454 MHz) covering WLAN at the 5.8 GHz bands and WiMAX in the 3.30 GHz bands, respectively.

A novel E-shaped microstrip patch tri-band antenna for wireless applications

A novel tri band planar antenna is presented in this paper this antenna is operating in frequency range 2.383-2.4484 GHz, 2.991-3.405 GHz and 5.438-5.545 GHz. All these frequencies are used for various wireless applications. The designed antenna consists of modified E shaped slot in rectangular patch. For simulation and optimization of this antenna CST Microwave Studio Software is used. The proposed antenna isoperating in three bands with bandwidth of 65 MHz, 414 MHz and 107 MHz at 2.41 GHz, 3.16 GHz and 5.48 GHz respectively. The return loss of proposed antenna at all resonant frequencies is less than -20dB. This antenna is advantageous because the structure is very simple compared to other proposed frequency reconfigurable antennas and as Fr-4 is cheap and easily available material so the cost for making this antenna is very low.

Dual band Step Shaped Antenna Array for WLAN and WiMAX Application

This paper presents the dual band step shaped array antenna, which is suitable for wireless local area network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) applications. Design and simulations are performed using CST Microwave Studio software and FR4 (Epsilon=4.4) is used as substrate for the design.The antenna consists of 1x2 radiating elements which resonate at 3.81 GHz and 5.52 GHz frequencies. Microstrip line technique is used to feed microstrip patch antenna. The result shows the antenna has bandwidth of 149 MHz (3737-3886 MHz) and 149MHz (5436-5585 MHz) covering WiMAX in the 3.81 GHz band and WLAN in the 5.52 GHz band. The return loss of proposed antenna at all resonant frequencies is less than - 10dB. The maximum gain at two bands has reached 5.3 dB at 3.81 GHz and of 6.7 dB at 5.52 GHz.