R. Ramana Reddy

Jawaharlal Nehru Technological University Anantapur

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Naresh K. Darimireddy

Institute of Engineering

M. Sujatha

The Sanskrit College and University

J. Nageswara Rao

Jawaharlal Nehru Technological University Anantapur

B Kalyanarao.

Jawaharlal Nehru Technological University Anantapur

N. Rajasekhar

Birla Institute of Technology and Science - Hyderabad Campus

P. Pavan Kumar

Wright State University

M. Kalpana

Jawaharlal Nehru Technological University, Kakinada

A. Vijaya Lakshmi

Jawaharlal Nehru Technological University Anantapur

Mahammed Basha. T.S

Vels University

M.Lakshmi Prasanna Rani

Cooperative Institutions

Jawaharlal Nehru Technological University Anantapur

Jawaharlal Nehru Technological University, Kakinada

GITAM University

Birla Institute of Technology and Science - Hyderabad Campus

Maharaj Vijayaram Gajapathi Raj College of Engineering

Indian Institute of Management Visakhapatnam

Koneru Lakshmaiah Education Foundation

Jawaharlal Nehru Technological University, Hyderabad

Université du Québec à Rimouski

Université du Québec

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Circular Patch Antenna with Rectangular Slots and DGS for UWB and Multiband Applications

M. Kalpana Kamal Kishore R. Ramana Reddy

A Circular patch antenna with rectangular slots (CPRS) and Defected Ground Structure (DGS) is presented in this paper. The even and uneven rectangular slot areas are considered. Better performance is obtained for the antenna with even slot areas. The CPRS antenna is a multiband antenna operating in three frequency bands with a bandwidth of 350 MHz (11.02 GHz – 11.37 GHz), 1.07 GHz (13.64 GHz – 14.71 GHz), and 1.54 GHz (17.59 GHz – 19.13 GHz) with 6 dBi peak gain. Adding DGS improves the bandwidth and gain making the antenna useful for UWB applications. With the introduction of DGS to the proposed CPRS antenna, frequency bandwidth of 3.10 GHz (4.98 GHz – 8.08 GHz) and 8.51 GHz (11.49 GHz – 20 GHz) with 6.9 dBi peak gain is obtained.

Patch antenna

10.1109/ic3p52835.2022.00040

Cite

Citations (1)

Multi-Band Rectangular Hybrid Antennas Loaded with Inter-Digital Structure Slot

2018 IEEE Indian Conference on Antennas and Propogation (InCAP) (2019)

Naresh K. Darimireddy Chan Wang Park R. Ramana Reddy B. R. Sanjeeva Reddy

In this paper, two rectangular multi-band hybrid antennas are proposed. Modified Inter-digital structure slot is loaded on top of DRA to achieve multi-functional capability for sub 6 GHz wireless applications. The tri-band hybrid antenna with modified inter-digital structure resonates at 2.93 GHz, 3.26 GHz & 5.5 GHz and consequent Return Loss (RL) bandwidths are 40 MHz(2.91-2.95 GHz), 60 MHz (3.23-3.29 GHz) and 230 MHz (5.37-5.6 GHz) respectively. The proposed quad-band hybrid antenna resonates at 2.48 GHz, 2.84 GHz, 3.26 GHz and 5.5 GHz and resultant RL bandwidths are 40 MHz, 40 MHz, 60 MHz and 220 MHz respectively. The field analysis and parametric study of the proposed hybrid antennas are presented using Ansys-HFSS Electro-magnetic solver. The gains obtained for the proposed antennas are more than 4 dBi at all the resonances that have been occurred.

HFSS

Return loss

10.1109/incap47789.2019.9134493

Cite

Citations (6)

Hexagonal Hybrid DRA Circularly Polarized Antenna for Multiband Applications

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) (2023)

D. Shobha Rani V. Harini M. Kalpana R. Ramana Reddy

In this work, a hybrid structure containing a hexagonal microstrip patch antenna with hexagonal rings loaded with a Dielectric Resonator (DR) is presented. The length of the hexagonal patch and DR is 10 mm. The height of Al2O3 ceramic DR is 7mm with an overall dimension of the proposed antenna of 51x45x1.6 mm ³ . The proposed antenna operates over multiple frequency ranges resulting in bandwidths of 30MHz (4.38–4.41 GHz), 230MHz (6.99-7.22 GHz), 100MHz (7.84–7.94 GHz), 650MHz (9.82–10.47 GHz), 110MHz (11.31–11.42 GHz), 70MHz (12.04–12.11 GHz), 340MHz (12.33-12.67 GHz) and 150MHz (13.03–13.18 GHz). The peak gain of the antenna is observed to be 6.61 dBi at 10.28 GHz and circular polarization characteristics are observed over the multiple frequencies ranges with a bandwidth of 210MHz (6.73-6.94 GHz), 100MHz (7.22-7.32 GHz), 90MHz (9.16-9.25 GHz), 140MHz (9.67-9.81 GHz), and 130MHz (11.42-11.55 GHz). Using bent microstrip line feed, two orthogonal modes are created resulting in CP radiation. The proposed antenna is suitable for C, X, and Ku band applications. The simulations are carried out using HFSS software.

HFSS

Patch antenna

Dielectric resonator antenna

10.1109/wams57261.2023.10242816

Cite

Citations (1)

Realization of FPGA based Burst QPSK Modem for Wireless Communication applications

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) (2022)

B Kalyanarao.R. Ramana Reddy D.K. Sunil

This paper presents the design and implementation of a Burst QPSK (Quadrature Phase Shift Keying) MODEM (Modulator Demodulator) with Convolutional encoding and Viterbi decoding method for UAV (Unmanned Aerial Vehicle) datalink applications. Convolutional encoding, Viterbi decoding, and burst frame structure design principles are briefly explored. In this paper, we describe a method for designing frame structure and synchronization algorithms in discrete time that efficiently conduct coherent detection in Additive White Gaussian Noise (AWGN) channels. These methods are well-suited for use on a digital signal processing (DSP) platform. The proof of concept for Burst QPSK MODEM implementation on FPGA is presented in this work. The design has been functionally verified in terms of transmitter bandwidth, constellation, EVM (Error Vector Magnitude), and receiver synchronization and demodulation. Xilinx's VIVADO design suite was used to implement the MODEM design on the XC7Z020-CLG484-1 ZYNQ series FPGA.

Convolutional code

Viterbi decoder

Viterbi algorithm

10.1109/wams54719.2022.9848253

Cite

Citations (0)

A Circular Patch Antenna with Bottleneck feed and DGS for C-Band and X-Band Applications

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) (2023)

K. Rubeeshwara Rao M. Sujatha M. Satya Anuradha R. Ramana Reddy

In this paper, a circular patch antenna with bottleneck feed and DGS is proposed. The antenna is fed with a bottleneck microstrip feed. The proposed antenna is developed on an FR-4 substrate with a thickness of 1.65 mm. The proposed antenna is a dual-band antenna operating with a bandwidth of 2.98 GHz (4.62 - 7.60 GHz) and 4.34 GHz (8.68 - 13.02 GHz) with a return loss of -37.79 dB at 5.6 GHz and -31.45 dB at 10.18 GHz. The peak gains obtained are 2.55 dBi and 5.59 dBi at 5.65 GHz and 10.15 GHz respectively. The Ansys HFSS EM Solver is used to simulate the proposed antenna.

HFSS

Patch antenna

Return loss

Multi-band device

10.1109/wams57261.2023.10242881

Cite

Citations (0)

Wideband Circularly Polarized Cylindrical Dielectric Resonator Antennas With Rectangular Curved Slots [Antenna Applications Corner]

IEEE Antennas and Propagation Magazine (2020)

Naresh K. Darimireddy R. Ramana Reddy A. Mallikarjuna Prasad

Wideband circularly polarized antennas with wide axial-ratio (AR) bandwidth and required gain are desired for point-to-multipoint communication and remote tracking applications. Two different designs of probe-fed rectangular curved slotted dielectric resonator antenna (SDRA) models are proposed in this article, one with an overall size of 50 × 50 mm ² (SDRA-1) and the other a scaled-down version with 25 × 25 mm ² (SDRA-2). Axially symmetric rectangular curved slots are introduced in cylindrical dielectric resonator antennas (CDRAs) to create asymmetry in the structure for circular polarization (CP). The proposed SDRA-1 offers a wide impedance bandwidth of 55% (4.14-7.31 GHz) and a 3-dB AR bandwidth of 38% (4.82-7.07 GHz) with a minimum AR value of 0.1 dB. The peak gain obtained for SDRA-1 is 6 dBi. A scaled-down version of the dielectric resonator antenna (DRA) provides an impedance bandwidth of 57.5% (7.34-12.94 GHz), a 3-dB AR bandwidth of 0.76 GHz, and a peak gain of 5.52 dBi. The proposed DRA models are suitable for IEEE wireless standard 802.11ac Wi-Fi (5 GHz), IEEE 802.11a (5.2 GHz), IEEE 802.16d worldwide interoperability for microwave access (WiMax) and x-band applications.

Dielectric resonator antenna

Wideband

Axial ratio

10.1109/map.2020.3027493

Cite

Citations (19)

Design of a New Dual Dynamic Flip-Flop with Low Power and Low Area

International Journal of Engineering Trends and Technology (2015)

Shaik Shabeena R. Ramana Reddy D. Rama Devi

Flip-flop

Flip

10.14445/22315381/ijett-v29p242

Cite

Citations (0)

Rectangle Patch Antenna with Slots and Defective Ground Structure for C-band Applications

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) (2024)

B. Balaji Vaddi Yasaswini R. Ramana Reddy B. Spandana

Rectangle

Patch antenna

10.1109/wams59642.2024.10527952

Cite

Citations (0)

Multi Wideband Hexagonal-Spiral Microstrip Band-Pass Filter for Wireless Applications

2018 IEEE Indian Conference on Antennas and Propogation (InCAP) (2018)

M. Sujatha R. Ramana Reddy Naresh K. Darimireddy B. Ramamohan

In this communication, multi-wideband micro-strip Hexagonal-Spiral (HS)band-pass filter is presented. The proposed multiband band-pass filter consists of four spiral shunt quarter-wavelength short-circuited stubs separated by connecting lines with length of λg/2 and λg/4, respectively. Appropriate transmission zeros are generated to isolate the bands of proposed band-pass filter, as desired. From the simulated results, the offered wide bandwidth observed for dual band-pass filter is 240 MHz (0.8 GHz to 1.04 GHz) and 250 MHz (1.18 GHz to 1.43 GHz). The bandwidth for the proposed triple band pass filter are 220 MHz (0.64 GHz to 0.86 GHz), 100 MHz (1.38 GHz to 1.48 GHz), and 400 MHz (2.31 GHz to 2.71 GHz). The triple band HS filter is fabricated and tested with network analyzer. The measured results are in good agreement with the simulation results. These filters are suitable for GSM 900 MHz and WLAN (2.4 GHz) applications.

Wideband

Multi-band device

GSM

10.1109/incap.2018.8770707

Cite

Citations (4)

Circularly Polarized Split Cylindrical Dielectric Antenna for Wireless Applications

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS) (2022)

Kalpana Muvvala R. Ramana Reddy

In this paper, conversion of conventional probe fed cylindrical dielectric resonator antenna with linear polarization (LP) in to a circularly polarized dielectric antenna have been proposed. The two orthogonal modes are generated with a split along the line joining the centre to the edges of the cylinder by creating asymmetry. The proposed antenna has a resonance frequency of 4 GHz with a gain of 5dBi, a Return Loss (RL) bandwidth of 660 MHz (3790-4450 MHz) and Axial Ratio (AR) bandwidth of 200 MHz (3950-4150 MHz).

Dielectric resonator antenna

Return loss

Turnstile antenna

Axial ratio

10.1109/wams54719.2022.9848159

Cite

Citations (0)