Praveen V. Naidu

Design & Development of Compact Uniplanar Semi-Hexagonal ACS Fed Multi-Band Antenna for Portable System Application

In the present work, a compact size, dual-band antenna is proposed for WLAN/WiMAX/LTE 2500/DMB applications. The designed antenna is fed by a 50 Ω coplanar line. The radiating component of the composed antenna consists of radiating strips with half hexagonal and vertical rectangular shapes and square-shaped ground plane which are printed on the same layer. The overall size of the antenna substrate is only 10× 24× 1.6 mm3. The simulated and measured results of the proposed antenna show that it operates in the frequency range from 2.5 GHz to 2.75 GHz and 5.0 GHz to 6.7 GHz, respectively.

A compact O-shaped printed ACS fed monopole dual-band antenna for 2.4GHz Bluetooth and 5GHz WLAN/WiMAX applications

In this research paper, a compact, novel O-shaped ACS fed dual-band monopole antenna for 2.4 GHz Bluetooth/WLAN, 4.9 GHz US public safety band and 5.0 GHz WLAN/WiMAX applications is presented and investigated. The proposed geometry consists of an O-shaped radiating branch, monopole-shaped radiating branch and a rectangular shaped uniplanar ground plane, which occupies an overall size of 20 × 12.5 × 1.6mm3. In the design, proposed radiating structure has been printed on a low cost single layared substrate FR4. By properly tuning the radiating branches electrical lengths, two independent resonant frequencies can be obtained and tuned independently. The presented antenna also exhibits omnidirectional radiation patterns with acceptable peak gains for the desired of 2.4 GHz bluetooth band, 4.9 GHz US public band, 2.4/5.2/5.8 GHz WLAN bands and 5.5 GHz WiMAX band applications.

A novel compact printed ACS fed dual-band antenna for Bluetooth/WLAN/WiMAX applications

In this research article, a compact dual band asymmetric coplanar strip-fed printed antenna is designed and presented for Bluetooth, WLAN/WiMAX and public safety applications. The dual frequency operating bands (2.45 GHz and 5.25 GHz) have been achieved by attaching two simple meander shaped radiating strips to the ACS feed line. The proposed antenna geometry is printed on a low cost FR4 substrate having thickness of 1.6mm with overall dimensions of 13 × 21.3m including uniplanar ground plane. The -10 dB impedance bandwidth of the meandered ACS-fed dual band monopole antenna is about 140MHz from 2.36-2.5 GHz, and 2500MHz from 4.5-7.0 GHz respectively, which can cover 2.4 GHz Bluetooth/WLAN, 5.2/5.8 GHz WLAN, 5.5 GHz WiMAX and 4.9 GHz US public safety bands. In addition to the simple geometry and wide impedance bandwidth features, proposed structure perform bidirectional and omnidirectional radiation pattern in both E and H-plane respectively.

ACS-fed e-shaped dual band uniplanar printed antenna for modern wireless communication applications

A printed small size (12×16.5 mm) ACS-fed e-shaped uniplanar antenna is proposed for dual band applications. The multiband operating characteristics have been achieved by integrating e-shaped radiating strips to the 50ΩACSfeed line. Two simultaneously operating wide bands have been generated by using optimized radiating branch strips for the multiband applications. For obtaining size reduction and wider impedance bandwidth, e-shaped meandered elements are chosen in the design. The proposed design features the bandwidth (VSWR < 2, reflection coefficient below–10 dB) of 100 MHz in 2.4–2.5 GHz, and 2100MHzin 4.0–6.1 GHz. The developed multiband antenna can be useful for several wireless communication applications, such as 2.4 GHz Bluetooth/RFID,WLAN(2.4/5.2/5.8 GHz), WiMAX (5.5 GHz), US public safety band (4.9 GHz), ISM band, radio frequency energy harvesting and internet of things (IoT) applications.

Wide band multi stage eight way Wilkinson power divider for defense applications

In this paper, a compact 8 way microstrip line Wilkinson Power Divider (WPD) is designed and proposed. The equal power divider consists of multiple multi-section WPD‟s with isolation resistors. By utilizing the multi-sections concept, a remarkably increase in the bandwidth is observed. In the design process, RT 5880 substrate is used with the thickness of 0.8 mm and dielectric constant of 2.2 and loss tangent of 0.0004. The simulated results such as return loss, insertion loss and isolation are plotted by using ADS simulation software and obtained results show good agreement.

A Speculative Approach to Design A Hybrid System for Green Energy

Now a days demand of energy is increasing all over the world. Because of this demand the fossils fuels are reducing day by day to meet the requirements of energy in daily life of human beings. It is necessary to balance the situation for the increasing energy demand by taking an optimistic overview about the natural renewable energy sources like sun, gust, hydro etc.,. These energy sources only can balance the situation of unbalancing between fossil fuels and increasing energy demand. Renewable energy systems are suitable for off grid services in power generation, to provide services to remote areas to build complex grid infrastructures. India has the abundant source of solar and wind energy. Individually these energy sources have some own advantages and disadvantages; to overcome the disadvantages of individual energy sources we can combine all these sources to make an efficient renewable source nothing but hybrid renewable energy source. In this paper we proposed a hybrid model which is a combination of four renewable energy sources solar, wind, RF signal and living plants to increase the energy efficiency.