M. Susila

A Novel Smiley Fractal Antenna (SFA) Design and Development for UWB Wireless Applications

Ultra Wideband (UWB) has been deliberated as a promising technology for short-range wireless communication with large unlicensed frequency band for commercial, enterprise private and public uses. Designing an antenna of compact size for portable wireless devices is one of the challenges especially for UWB based wireless communication technologies. In this paper, a novel Smiley Fractal Antenna (SFA), employed with N-notch feed and modified ground plane, is designed and developed to achieve the desired characteristics. The proposed antenna is of compact size with dimensions of 34× 32× 1. 6m m 3 ,f abricated on an FR-4 substrate wither =4 .4. The radiation pattern of the proposed antenna is omnidirectional with a maximum gain of 4.83 dB and efficiency of 93.55% obtained through 3D electromagnetic simulation software tools. The simulated results are compared with measured ones using RF equipment. The results obtained show that the proposed SFA is a suitable candidate for variety of UWB wireless communication applications.

Design of a novel microstrip-fed UWB fractal antenna for Wireless Personal Area communications

A novel microstrip-fed fractal antenna is designed and fabricated to achieve the desired Ultra Wideband (UWB) features for Wireless Personal Area Network (WPAN) communication applications. The proposed antenna comes with a compact size of 34×32×1.6 mm3 and design simulations executed utilizing 3D Electromagnetic (EM) tool and its prototype is validated using Radio Frequency (RF) equipment. The antenna operates over the entire UWB band with nearly omnidirectional radiation patterns and observed a maximum gain of 4.83 dB with an impedance bandwidth of 7.90 GHz. Further, simulations have also done for 1 × 2 antenna array for better gain and performance.

Compact reconfigurable Ultra Wide band antenna design for wireless communication

This paper propose a novel design for multiband reconfigurable Ultra Wideband (UWB) antenna which can be used for spectrum sensing in cognitive wireless applications. The compact reconfigurable UWB antenna (CRUWBA) proposed is having an excellent matched structure. The radiating patch of the CRUWBA consists of seven regular hexagons united with a circular ring. The CRUWBA is operational in nearly the entire UWB spectrum spanning from 3.1 GHz to 10.6 GHz, and achieves a gain up to 5.8 dB. Within the UWB spectrum, the antenna is capable of operating in five different bands. The operational bands are: band 1 [3-4.3GHz, 5-9 GHz], band 2 [3-3.5GHz, 4.9-6.2 GHz, 7.2-8.9 GHz], band 3 [3-3.8 GHz, 6.7-8.6 GHz], band 4 [3.9-6.1 GHz, 7.4-8.9 GHz] and band 5 [3-4.2 GHz, 4.8-5.7GHz, 6.3-8.4 GHz]. The CRUWBA achieves reconfigurability by employing three switches, and hence have eight switching cases. By analyzing the results, the antenna proves to be satisfying the performance criteria. All the simulations were carried out in Ansoft High Frequency structure simulator (HFSS).

Design of an Internal Multi-resonant PIFA Antenna for Mobile Telecommunication Networks

A PIFA antenna which supports hexa bands of various wireless standards in this current era is designed. The proposed antenna is configured with the concept of loop and slot structure in order to acquire wider bandwidth, multiple resonance, and good efficiency and to diminish the size of conventional PIFA antenna. This multiband internal PIFA antenna is having the ability of operating in GSM (900 MHz), Standard Positioning Service (1.176 GHz) of Indian Regional Navigational Satellite System (IRNSS) L5 band UMTS-DCS (1710–1880 MHz) and PCS (1850–1990 MHz), LTE 2300 (2305–2400 MHz) and ISM bands of Wi-Fi/Bluetooth (2.4 GHz). The proposed multiband antenna is designed using the FR4 epoxy substrate with the thickness of 1.6 mm. The simulation results are analyzed and optimized using 3D electromagnetic simulation software which is based on the finite element methodology. Return loss, voltage standing wave ratio (VSWR), radiation pattern, and gain are the attributes obtained and validated for the designed PIFA antenna.

Compact UWB antenna and radio propagation analysis for indoor wireless communications

As most of the wireless communications happens in indoors, understanding indoor propagation is becoming increasingly important. Information sharing between user / devices wirelessly is rapidly growing fast. Transfer of the information instantly anywhere anytime is the need of the hour. As a result short range, high data rate wireless communication created a huge expectation among users. Based on this, our primary objective is to design an Ultra Wideband (UWB) antenna based on fractal geometry, suitable for indoor wireless communication. We designed a Custom-made omnidirectional UWB antenna that operates over 3.1–10.6 GHz; with maximum gain around 4.9 dB. The antenna is of compact size with dimension of 34 × 32 × 1.6 mm3 built on FR4 substrate. The antenna is designed and simulated using Electromagnetic (EM) simulation tool and validated with Radio Frequency equipment. The proposed antenna for indoor communications is validated through the radio propagation analysis utilizing EM computations and path loss models for the line of sight as well as the non-line of sight scenarios.

Wireless impetus technology on synaesthetic ambient intelligence (WITS-AI)

Synaesthetic projection with augmented reality is a cropping up futuristic display technology that empowers advance human interaction with high-quality projected images in free space. In order to make such ubiquitous displays more attainable, conspicuous and low-cost user tracking solutions are required. This novel walk through design allows the users to literally get their hands into the immaterial display, to interact with the augmented world. In this proposed system, an android operating system based mobile phone device is connected wirelessly with immaterial screen device in creating an optical see through display in free space with advanced user interactions, thereby creating an ambient intelligence, produced through augmenting physical world around us with the digital information.

Study and analysis of miscrstrip patch antenna for WLAN/HIPERLAN

This paper depicts design techniques of Rectangular and Circular microstrip antenna using High Frequency Structured Simulator (HFSS) for indoor Ultra Wide Band (UWB) applications at 5.4 GHz Such as WLAN/HIPERLAN. Further parametric analyses were carried out for various substrates like FR-4, RT/ Duroid 5880, Teflon and Curtain Cotton. The return loss, VSWR, radiation pattern values are found from the simulated graph and compared. From the compared results it is clear that the FR-4 substrate yields better output than rest of the substrates.

Microstrip-fed dipole antenna for UWB wireless communications

A microstrip-fed great arc shaped dipole antenna is proposed and designed for ultrawideband communications. The antenna has large bandwidth covering the frequency band from 3.8 to 9.4 GHz. With simple and proper modification of the radiation patches, a frequency notched performance is obtained at the frequencies 5.8 and 7.5GHz. This paper aims at the performance at 5GHz ISM band. The proposed antenna also provides a gain of 5.68 dB, which is better as compared to the conventional dipole antenna. Measured results show that, the proposed antenna is suitable for UWB applications due to the high performance.