Rashmi Roges

Bio: Rashmi Roges is an academic researcher from Lovely Professional University. The author has contributed to research in topics: Antenna (radio) & Bandwidth (computing). The author has co-authored 2 publications.

A Compact CPW-Fed Log-Periodic Antenna for IoT Applications

Abstract: A miniaturized, planar, microstrip patch antenna, of 20mm×20mm on 1.6mm thick FR4 substrate, is proposed for small and mobile IoT sensor units. The sensor nodes used in IoT environment will require compact, low cost and parameter optimized antennas which could easily connect to existing standard communication protocols. The proposed antenna has a log-periodic antenna structure and is fed by a co-planar waveguide. The simple structure resonated at 3.6GHz giving an impedance bandwidth between 3.5GHz to 3.67GHz with an operating bandwidth of 170MHz. Slots are inserted in the co-planar ground plane after parametrically analysing the optimum length for the slot.This successfully resulted in 2.46GHz resonating frequency of antenna with a bandwidth of 70MHz. The antenna also provides a high gain of 9.36dB at the resonant frequency of 2.46GHz. Miniaturized antenna with good performance parameters is highly desired for IoT applications. The above said antenna with its given characteristics makes it an excellent candidate for IoT sensor units.

A Compact Wideband Antenna with DGS for IoT Applications using LoRa Technology

Abstract: A highly miniaturized antenna for IoT applications using LoRa technology is discussed in this paper. The antenna is double leaf shaped with DGS and is printed on FR4 substrate of size $22\times 34\times 0.5\text{mm}^{3}$ . The antenna has been designed and optimized to resonate at 433MHz and to include the LoRa frequency bands of 868MHz and 915MHz also. The simulated and experimental results of the antenna is in good agreement with a low VSWR in the operating range along with a radiation efficiency of 97% and a maximum gain of 2. 56dB. The size and performance of the proposed antenna are the main stand outs when compared with the similar antennas working in the same operating frequencies.

Improving the Performance of Paper-Based Dipole Antennas by Electromagnetic Flux Concentration

Abstract: One of the essential issues in modern advanced materials science is to design and manufacture flexible devices, in particular in the framework of the Internet of Things (IoT), to improve integration into applications. An antenna is an essential component of wireless communication modules and, in addition to flexibility, compact dimensions, printability, low cost, and environmentally friendlier production strategies, also represent relevant functional challenges. Concerning the antenna’s performance, the optimization of the reflection coefficient and maximum range remain the key goals. In this context, this work reports on screen-printed paper@Ag-based antennas and optimizes their functional properties, with improvements in the reflection coefficient (S11) from −8 to −56 dB and maximum transmission range from 208 to 256 m, with the introduction of a PVA-Fe3O4@Ag magnetoactive layer into the antenna’s structure. The incorporated magnetic nanostructures allow the optimization of the functional features of antennas with possible applications ranging from broadband arrays to portable wireless devices. In parallel, the use of printing technologies and sustainable materials represents a step toward more sustainable electronics.

Dual-band microstrip patch antenna for IoT application

Abstract: Internet of Things (IoT) primarily based application requires integration with the wireless communication technology to make the application data with ease available. In this paper, a modified 12 mm x 16 mm x 1.6 mm micro strip patch antenna has been proposed for IoT applications at 2.4 Giga Hertz (GHz) in the Industrial Scientific and Medical (ISM) band. This wideband antenna is designed using Flame Retardant4 (FR4) material as the substrate. The multiband operating characteristics have been achieved by radiating strips to the 50 feed line. Proposed wideband antenna covers frequencies ranging from 1.8 GHz to 3 GHz and 5.3 GHz to 6.9 GHz for -10 dB return loss. The results are analyzed and discuss in term of return loss, Voltage Standing Wave Ratio (VSWR), efficiency and gain. The proposed design has a maximum losses of -31.59 dB at 2.4 GHz and -16.94 dB at 6 GHz. The developed antenna can be useful for several wireless communication applications, such as 2.4 GHz Bluetooth, Wireless Local-Area Network (WLAN) (2.4/5.8 GHz), Worldwide Interoperability for Microwave Access (WiMAX) (5.5 GHz), ISM band and IoT applications.

Development of bandwidth‐enhanced X–Ku band reflectarray antenna using a novel design strategy

Abstract: This paper reports the development of a reflectarray (RA) antenna using overlapping tri-resonance phase distribution to produce enhanced bandwidth performance in X/Ku band frequencies. The RA with square aperture (24 cm) operating from 11 to 15.8 GHz is constructed using unit cells with concentric Malta cross and square ring developed on Diclad substrate isolated from the ground through a 2.5-mm air layer. Variation in the concentric element's size along with the length of the delay line connected to the square ring offers a 518° phase range. The distribution of the 529 RA elements is done using the phase variations observed at 12, 13, and 14 GHz. The optimized design of the proposed antenna offers a simulated peak gain of 27.43 dBi at 12 GHz and a 1-dB gain bandwidth of 38%. The experimental validation of the fabricated prototype exhibits a peak gain of 27.4 dBi at 12 GHz with a sidelobe level (SLL), and cross-polarization level less than −15.6 dB, and −28 dB respectively, and a 1-dB gain bandwidth of 37%. The enhanced performance characteristics of the proposed X/Ku wideband reflectarray antenna befit the uplink and downlink operations of fixed satellite services (FSS).

A Miniaturized, Dual-Port, Multiband MIMO with CSRR DGS for Internet of Things Using WLAN Communication Standards

Abstract: A compact, dual-port, triband MIMO antenna is designed and tested for three sub-6 GHz WLAN bands for IoT applications. The size and performance of the antenna make it versatile for the emerging IoT applications communicating using the 2.4 GHz, 5.2 GHz, and 5.8 GHz WLAN frequencies. The single radiating element of antenna geometry includes a pair of modified and optimized rectangular patches. A complimentary split ring resonator (CSRR) structure is incorporated in the ground plane as a defect (defected ground structure) to attain the third operational band. The orientation of the elements, orthogonally arranged, along with DGS, enhances the isolation between the radiating elements keeping it below 18 dB throughout the three operating frequency bands. The size of the final antenna is as small as 0.32 λ 0 × 0.32 λ 0 mm2 build on commercially available and cheap FR4 substrate of thickness 1.5748 mm. A peak gain of 7.17 dBi is attained for the proposed MIMO system. This MIMO antenna also satisfies the diversity parameter requirements including DG > 9.8 , ECC < 0.5 , TARC < − 10 dB, and CCL < 0.5 bits/s/Hz. This makes the proposed antenna a good candidate for IoT applications employing WLAN frequencies.