Gayatri Tangirala

• M.Tech, Ph.D.
• Associate Professor at Joginpally B.R. Engineering College

Today's wireless spectrums are characterized by a fixed spectrum assignment policy. However, a huge portion of the allocated spectrum is used spasmodically and geographical variations in the usage of allocated spectrum ranges from 15% to 85% with a high discrepancy in time. We can't create resources but we can reuse the available resources. Cogniti...

This manuscript explores the development of a quad-port Multiple-Input-Multiple-Output (MIMO) antenna featuring reconfigurable grounds tailored for 5G NR n77/n79 and X-band applications, utilizing PIN diodes. The research begins with the evolution of a single unit Ultra Wideband antenna, which is subsequently expanded to a reconfigurable grounds 2...

The research article outlines the evolution of a quad-element Luna-shaped UWB MIMO with enhanced isolation and gain using novel decoupling networks. The described MIMO module is tailored on a FR4 substrate of area 45 × 45 mm² (0.378 λ0 × 0.378 λ0), where λ0 is estimated at 2.52 GHz, and 7 mm (0.0588 λ0) element to element separation between the rad...

This chapter presents a comprehensive report on the various categories of antenna modules needed for implementation of rectenna systems. It also discusses about the other key components of rectenna system like RF filter, matching circuits and rectifier networks. In recent days, rectenna occupied a prominent place because of the increased demand of...

This chapter presents an extensive report on the different categories of antenna modules for the development of cognitive radio systems. It also discusses about the other key components of cognitive radio systems like RF filters, low noise amplifiers, analog to digital converters, reconfiguration mechanisms, digital signal processors, digital to an...

Nowadays, RF energy harvesting systems are good alternative for energizing low-power electronic devices. This chapter proposes such system consisting of RF to DC signal converter with a dual-band impedance matching network (DBIMN) and diamond slotted MIMO antenna. The proposed MIMO antenna captures unused ambient RF energy in GSM1800, Wi-Fi, ISM, s...

This research article outlines the evolution of an octagon slotted quad port MIMO antenna with enhanced isolation in 1.71–12 GHz band, which includes GSM1800 to X-bands. This MIMO is printed on an FR4 material substrate of area 78 × 78 mm2 (0.343λ0 × 0.343λ0), where λ0 is calculated at lower cut off frequency, and 2 mm (0.009λ0) inter-element separ...

This paper mainly addresses the performance analysis of quad port MIMO antenna with reconfigurable grounds in the band 3.1-10.6 GHz, which includes 5G n77/n79 to X-bands. It starts with the development of a single unit ultra wideband antenna and then extends to 2×2 MIMO antenna with reconfigurable grounds using one PIN diode D by placing single uni...

In recent years, artificial intelligence (AI) aided communications grabbed huge attention to providing solutions for mathematical problems in wireless communications, by using machine learning (ML) and deep learning (DL) algorithms. This paper initially presents a short background on AI, CEM, and the role of AI / ML / DL in antennas. A study on ML...

This present article reports a high isolation four-port Wrench shaped compact UWB MIMO antenna with a novel decoupling network in the ground plane, and its step-by-step evolution is presented for 3.1–10.6 GHz. The proposed four-port MIMO antenna is fabricated on an FR4 substrate of size 44 × 44 mm² (0.342λ0 × 0.342λ0), where λ0 is a free space wave...

The microstrip antenna mainly consists of four modules. They are ground plane, dielectric substrate, feed line and radiating patch. Most of time, the patch, feed line and ground plane use copper material whereas the substrate will take different dielectric materials. Hence, the antenna substrate material plays a major role on antenna performance ch...

The presented manuscript describes the influence of FR4 material substrate on diamond slotted ultra wideband antenna in 1.71 GHz to 12 GHz. It also gives the brief review of various substrate materials on the performance of patch antennas. This design is printed on FR4 material substrate of size 44 × 34 × 1.6 mm³. The antenna shows an impedance ban...

This paper discusses the design of a circular planar monopole UWB antenna for spectrum sensing in the band 3.1-10.6GHz, which is FCC proposed unlicensed UWB range. It is a key module for implementing CR in 3.1-10.6GHz. The design is customized on the substrate (FR4) with size of 29×21×1.6mm 3. It achieves S11 ≤-10dB in 2.27GHz-12.8GHz. It shows 97%...

This paper emphasizes on the design analysis of an octagon slotted planar circular Ultra-wideband monopole for RF energy harvesting in the band 1.71-12GHz. It coexists with many RF bands like GSM1800 (UL: 1.71-1.785GHz; DL: 1.805-1.88GHz), UMTS, LTE, Wi-Fi, ISM, UWB, WLAN, Wi-MAX and X-band. This antenna helps to capture the unused RF energy in the...

This paper describes the analysis and design of a hexagon slotted UWB monopole for spectrum sensing in the band 3.1-10.6GHz, which is FCC proposed unlicensed UWB range. It is a key module for implementing CR in 3.1-10.6GHz. The design is customized on the substrate (FR4) with size of 29×23×1.6mm3 . It achieves S11≤−10dB in 2.29GHz-12.61GHz. It show...

The paper emphasizes on Ultra Wide Band (UWB) technology, which gained popularity since nineteenth century. This technology is still proliferating to new branches of research due to its key features like secure, reliable, low power consumption and high speed data transfer over smaller distances. The paper presents a hexagon slotted circular monopol...

The Ultra Wide Band (UWB) technology contribute significantly to recent wireless communications due to its merits like very large bandwidth, multipath immunity, high security, reliability, low cost, low power and high speed data transfer. To make use of this technology for contemporary applications it is a challenging task to design small sized pri...

Federal Communications Commission (FCC) has allotted a bandwidth of 7.5GHz (from 3.1GHz to 10.6GHz) for ultra wideband (UWB) wireless communications, UWB is rapidly advancing as a high data rate wireless communication technology. In this paper requirements for the Ultra-wideband antennas for wireless system are discussed UWB applications are becomi...

Today, the world is moving very fast because of latest technologies and its innovations. Every user expects the best service network rather than best connected network. At the same time everyone would like to be connected seamlessly anytime anywhere. The Next Generation Wireless Networks (NGWN) must have the capability to provide high data transfer...