Multi-Line Based Efficient and Wideband Doherty Power Amplifier : Analytical Study Karthik Rudramuni, Dushyant Kumar Sharma Proceedings of Conecct 2024 10th IEEE International Conference on Electronics Computing and Communication Technologies, 2024 This article introduced a novel approach to enhance the bandwidth and efficiency of multi-line based Doherty Power Amplifiers (DPAs) by utilizing a impedance optimizing approach for impedance transformer networks (ITN). The ITN comprises multiple quarter wave transmission lines (QWTLs). A comprehensive analytical analysis is conducted, focusing on the impedance optimization of the QWTL lines. By carefully optimizing the impedance values of the QWTLs, a significant improvement in efficiency is achieved at 6-dB output power back-off (OPBO) level and peak power level across the frequency band. The proposed DPA demonstrates OPBO and peak power efficiency ranging from 65% to 80% across the 80% of fractional bandwidth in analytical simulations. Hence, an efficient and wideband DPA is attained in this work.
High Power Compact Doherty Power Amplifier for n8 and n106 5G Base-Station Karthik Rudramuni, Dushyant K Sharma, Karun Rawat 2024 IEEE Microwaves Antennas and Propagation Conference Mapcon 2024, 2024 This paper presents a novel design of a high-power compact Doherty Power Amplifier (DPA) optimized for n8 and n106 5G base-stations (BSs). The proposed methodology innovatively eliminates the traditional output matching network and with a post-matching network to achieve a compact design with high efficiency and gain. The design operates efficiently over the frequency band of $\mathbf{8 8 0}$ to $\mathbf{9 5 0} \mathbf{~ M H z}$. Detailed simulation results demonstrate that the designed DPA not only reduces size and complexity but also maintains high efficiency and gain across the targeted frequency range. Achieved peak power is more than 57.5 dBm for an efficiency more than $\mathbf{7 0 \%}$ over the band. At an average power of 50.6 dBm attained efficiency is above $\mathbf{6 0 \%}$. The gain is above 18 dB over the frequency band. The size of the proposed DPA is 150 mm X 100 mm. This approach provides a promising solution for next generation 5G infrastructure, addressing the need for compact, high-performance high power amplifiers.
High Gain Metamaterial Antenna for High Data Rate Mm-Wave Communication Systems Yogeshwar Dutt Sharma, Bancha Luadang, Karthik Rudramuni, Abhishek Kandwal 2024 IEEE Wireless Antenna and Microwave Symposium Wams 2024, 2024 This paper proposes a high gain metamaterial based antenna for high data rate millimeter wave communication systems. The frequency band from 37 GHz – 42 GHz can also be used for high data rate communications. The proposed antenna consists of a radiating patch with a metamaterial superstrate layer and is designed over a thin dielectric to provide transmission in the proposed high data rate frequency band. The compact structure with good characteristics in terms of impedance bandwidth (38-40 GHz), antenna gain (>10 dB), return loss (23 dB) (reflection coefficient), reduced losses and high efficiency (95 %) provides a good antenna option to be integrated with the millimeter wave communication systems for high data rate transmissions This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.
CX Band Semi Disk-Ring Dual Band Shared Aperture Antenna Rajat Thakur, Rohit Jasrotia, Pawan Kumar, Karthik Rudramuni, Abhishek Kandwal 2024 IEEE Wireless Antenna and Microwave Symposium Wams 2024, 2024 An efficient simple design of a dual band low isolation shared aperture antenna is presented in this communication. The design consists of a semi disk placed in between a circular ring with a two port network. The S-parameters have shown good response of -40 dB in the band with a directivity/gain of about 7.8 dBi. The side lobe levels have been reduced to an ultralow level of -29.1 dB. The designed antenna resonates in C and X frequency bands and the isolation is as low as -35 dB and -45 dB respectively at the two resonating frequencies.
Wideband and Efficient Doherty Power Amplifier in n78 C-band Dushyant Kumar Sharma, Karthik Rudramuni, Ahmad Zakaria Ahmad, Mohammad Abdul Shukoor, Karun Rawat 2023 IEEE Microwaves Antennas and Propagation Conference Mapcon 2023, 2023 This paper presents an efficient, linear, and broadband Doherty power amplifier (DPA) design in n78 C-band. In order to achieve improved performance, a modified load combiner network (MLCN) approach is incorporated into an inverse Doherty PA (IDPA) architecture. Proposed PA is realized through a premier and cutting-edge n78 band device, GTRB384608FC. Proposed DPA covers entire n78 band from 3.3 to 3.8 GHz (500 MHz) with enhanced efficiency of 40.5% to 46.5%, for an average power of 47.5 dBm and attained peak power, ranging from 54 dBm to 55.5 dBm. As well as it able to sustain an output PAPR in between 6.5 dB to 8 dB across the spectrum in continuous wave (CW) signal excitation.
Slot coupled dual band high gain circularly polarized metasurface antenna Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, Krishnamoorthy Kandasamy International Journal of RF and Microwave Computer Aided Engineering, 2022 This article presents a slot coupled dual-band metasurface (MTS) based antenna with high gain and circular polarization characteristics. The MTS consists of two different unit cells, which give rise to two operating bands. The metasurface is excited by the slot aperture fed by a 50 Ω microstrip feed-line. The circular polarization is achieved by the diagonally oriented rectangular patch-based unit cells on top of the square substrate. Two orthogonal modes of MTS are required to produce circularly polarized waves, and these modes are excited by the slot aperture. The proposed MTS-inspired antenna is fabricated and experimentally validated. The experimentally verified impedance bandwidth of 33.71% in the lower frequency band and 5.35% in the upper-frequency band is achieved. The measured 3 dB (AR <3 dB)axial ratio bandwidth of 6.22% and 0.98% with a peak gain of 8.89 and 6.32 dBic is achieved with respect to 4.8 and 6.4 GHz resonant frequencies.
Broadband and Efficient Doherty Power Amplifier by Influencing Output Impedance of Auxiliary Power Amplifier and Optimizing Impedance of Quarter-Wave Transmission Line Amit Kumar, Karthik Rudramuni, Dushyant K. Sharma, Gande Arun Kumar, Mohammad Farukh Hashmi 2022 IEEE Microwaves Antennas and Propagation Conference Mapcon 2022, 2022 In this paper, a novel Doherty Power Amplifier configuration with broadband and highly efficient characteristics is proposed. It is based on the synthesis of key approaches such as non-infinite output impedance of auxiliary power amplifier and optimizing the impedance of λ/4 transmission line. A detailed analytical analysis of drain efficiency at peak power level and at 6-dB output power back-off level is performed. The proposed methodology has yielded the peak power efficiency as well as the 6-dB output power back-off efficiency always greater than 70% in the entire frequency range. Thus, a highly efficient Doherty Power Amplifier with a very wide fractional bandwidth of 80% is obtained.
A Zero-Index Based Metasurface Antenna with Improved Gain and Circular Polarization Characteristics Puneeth Kumar T.R, Karthik. R, Krishnamoorthy. K Proceedings of the 2021 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems Making Waves in Texas Wmcs 2021, 2021 A zero-index based metasurface (MTS) is used to increase the gain of a circularly polarized (CP) patch antenna. The patch antenna is truncated at its corner to obtain the CP wave. The patch antenna gain in increased by loading the metasurface. The proposed CP antenna with enhanced gain is fabricated and verified experimentally. A measured impedance bandwidth (< –10dB) of 530 MHz and axial ratio bandwidth (< 3dB) of 100 MHz is achieved. The peak gain of 12.15 dBiC is obtained at the center frequency of 7.47 GHz with a better level of cross-polarization.
Dual-Band Asymmetric Leaky-Wave Antennas for Circular Polarization and Simultaneous Dual Beam Scanning Karthik Rudramuni, Basudev Majumder, Puneeth Kumar Tharehhalli Rajanna, Krishnamoorthy Kandasamy, Qingfeng Zhang IEEE Transactions on Antennas and Propagation, 2021 In this article, two configurations of novel dual-band half-mode substrate integrated waveguide (HMSIW) leaky-wave antennas are presented. The first proposed antenna radiates linearly polarized (LP) waves in the lower band and circularly polarized waves in the upper band when the unit cells are cascaded sequentially. The second antenna, where the sidewall via of the HMSIW unit cells is connected alternatingly, provides simultaneous dual beams with different polarization in the upper operational band in addition to the LP beam in the lower operational band. The unit cells of the two antennas are analyzed in terms of their dispersion behaviors. Finally, the performance of both the antennas is experimentally verified.
Goubau line based end-fire antenna Karthik Rudramuni, Puneeth K. T. Rajanna, Krishnamoorthy Kandaswamy, Basudev Majumder, Qingfeng Zhang International Journal of RF and Microwave Computer Aided Engineering, 2019
Transition-Tapered Coplanar Sensor Employing Semi-Arc Cut Resonators With Dual Perforated Arrays For Enhanced EM Glucose Detection T Sood, K Rudramuni, P Kumar, AM Almuhlafi, H Vettikalladi, A Kandwal Sensors and Actuators A: Physical, 117886 , 2026 2026
High Power Compact Doherty Power Amplifier for n8 and n106 5G Base-Station K Rudramuni, DK Sharma, K Rawat 2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1-4 , 2024 2024
Multi-Line Based Efficient and Wideband Doherty Power Amplifier: Analytical Study K Rudramuni, DK Sharma 2024 IEEE International Conference on Electronics, Computing and … , 2024 2024
CX Band Semi Disk-Ring Dual Band Shared Aperture Antenna R Thakur, R Jasrotia, P Kumar, K Rudramuni, A Kandwal 2024 IEEE Wireless Antenna and Microwave Symposium (WAMS), 1-3 , 2024 2024
High Gain Metamaterial Antenna for High Data Rate Mm-Wave Communication Systems YD Sharma, B Luadang, K Rudramuni, A Kandwal 2024 IEEE Wireless Antenna and Microwave Symposium (WAMS), 1-3 , 2024 2024
Wideband and Efficient Doherty Power Amplifier in n78 C-band DK Sharma, K Rudramuni, AZ Ahmad, MA Shukoor, K Rawat 2023 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1-4 , 2023 2023 Citations: 4
Broadband and Efficient Doherty Power Amplifier by Influencing Output Impedance of Auxiliary Power Amplifier and Optimizing Impedance of Quarter-Wave Transmission Line A Kumar, K Rudramuni, DK Sharma, GA Kumar, MF Hashmi 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 142-146 , 2022 2022 Citations: 3
Slot coupled dual band high gain circularly polarized metasurface antenna PK Tharehalli Rajanna, K Rudramuni, K Kandasamy International Journal of RF and Microwave Computer‐Aided Engineering 32 (8 … , 2022 2022 Citations: 2
Dual-band asymmetric leaky-wave antennas for circular polarization and simultaneous dual beam scanning K Rudramuni, B Majumder, PKT Rajanna, K Kandasamy, Q Zhang IEEE Transactions on Antennas and Propagation 69 (4), 1843-1852 , 2020 2020 Citations: 36
Dual‐band dual‐polarized leaky‐wave structure with forward and backward beam scanning for circular polarization‐flexible antenna application K Rudramuni, B Majumder, K Kandasamy Microwave and Optical Technology Letters 62 (5), 2075-2084 , 2020 2020 Citations: 12
Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction PK Rajanna, K Rudramuni, K Kandasamy International Journal of Microwave and Wireless Technologies 12 (2), 131-137 , 2020 2020 Citations: 39
Goubau line based end‐fire antenna K Rudramuni, PKT Rajanna, K Kandaswamy, B Majumder, Q Zhang International Journal of RF and Microwave Computer‐Aided Engineering 29 (12 … , 2019 2019 Citations: 6
Compact triband circularly polarized planar slot antenna loaded with split ring resonators PK Tharehalli Rajanna, K Rudramuni, K Kandasamy International Journal of RF and Microwave Computer‐Aided Engineering 29 (12 … , 2019 2019 Citations: 18
A wideband circularly polarized slot antenna backed by a frequency selective surface PKT Rajanna, K Rudramuni, K Kandasamy Journal of Electromagnetic Engineering and Science 19 (3), 166-171 , 2019 2019 Citations: 33
A high-gain circularly polarized antenna using zero-index metamaterial PKT Rajanna, K Rudramuni, K Kandasamy IEEE Antennas and Wireless Propagation Letters 18 (6), 1129-1133 , 2019 2019 Citations: 81
Dual Band Circularly Polarized Slot Antenna Loaded with Asymmetric Cross Strips TRP Kumar, R Karthik, K Krishnamoorthy 2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 1-3 , 2018 2018 Citations: 3
Goubau-line leaky-wave antenna for wide-angle beam scanning from backfire to endfire K Rudramuni, K Kandasamy, Q Zhang, XL Tang, A Kandwal, ... IEEE Antennas and Wireless Propagation Letters 17 (8), 1571-1574 , 2018 2018 Citations: 99
Compact bandpass filter based on hybrid spoof surface plasmon and substrate integrated waveguide transmission line K Rudramuni, K Kandasamy, A Kandwal, Q Zhang 2017 IEEE Electrical Design of Advanced Packaging and Systems Symposium … , 2017 2017 Citations: 10
Mutual Coupling Reduction of Microstrip Patch Antenna Array Using Slotted Ground Structure R Karthik, RK Manjunath, HV Kumaraswamy IJRET: International Journal of Research in Engineering and Technology 4 … , 2015 2015 Citations: 2
Prof. RK Manjunath and Dr. HY Kumaraswamy," Rectangular slotted ground structure to reduce Mutual coupling in Microstrip Patch antenna array," R Karthik International Journal of Advanced Research in Electronics and communication … , 2015 2015 Citations: 2
MOST CITED SCHOLAR PUBLICATIONS
Goubau-line leaky-wave antenna for wide-angle beam scanning from backfire to endfire K Rudramuni, K Kandasamy, Q Zhang, XL Tang, A Kandwal, ... IEEE Antennas and Wireless Propagation Letters 17 (8), 1571-1574 , 2018 2018 Citations: 99
A high-gain circularly polarized antenna using zero-index metamaterial PKT Rajanna, K Rudramuni, K Kandasamy IEEE Antennas and Wireless Propagation Letters 18 (6), 1129-1133 , 2019 2019 Citations: 81
Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction PK Rajanna, K Rudramuni, K Kandasamy International Journal of Microwave and Wireless Technologies 12 (2), 131-137 , 2020 2020 Citations: 39
Dual-band asymmetric leaky-wave antennas for circular polarization and simultaneous dual beam scanning K Rudramuni, B Majumder, PKT Rajanna, K Kandasamy, Q Zhang IEEE Transactions on Antennas and Propagation 69 (4), 1843-1852 , 2020 2020 Citations: 36
A wideband circularly polarized slot antenna backed by a frequency selective surface PKT Rajanna, K Rudramuni, K Kandasamy Journal of Electromagnetic Engineering and Science 19 (3), 166-171 , 2019 2019 Citations: 33
Compact triband circularly polarized planar slot antenna loaded with split ring resonators PK Tharehalli Rajanna, K Rudramuni, K Kandasamy International Journal of RF and Microwave Computer‐Aided Engineering 29 (12 … , 2019 2019 Citations: 18
Dual‐band dual‐polarized leaky‐wave structure with forward and backward beam scanning for circular polarization‐flexible antenna application K Rudramuni, B Majumder, K Kandasamy Microwave and Optical Technology Letters 62 (5), 2075-2084 , 2020 2020 Citations: 12
Compact bandpass filter based on hybrid spoof surface plasmon and substrate integrated waveguide transmission line K Rudramuni, K Kandasamy, A Kandwal, Q Zhang 2017 IEEE Electrical Design of Advanced Packaging and Systems Symposium … , 2017 2017 Citations: 10
Goubau line based end‐fire antenna K Rudramuni, PKT Rajanna, K Kandaswamy, B Majumder, Q Zhang International Journal of RF and Microwave Computer‐Aided Engineering 29 (12 … , 2019 2019 Citations: 6
Wideband and Efficient Doherty Power Amplifier in n78 C-band DK Sharma, K Rudramuni, AZ Ahmad, MA Shukoor, K Rawat 2023 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1-4 , 2023 2023 Citations: 4
Broadband and Efficient Doherty Power Amplifier by Influencing Output Impedance of Auxiliary Power Amplifier and Optimizing Impedance of Quarter-Wave Transmission Line A Kumar, K Rudramuni, DK Sharma, GA Kumar, MF Hashmi 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 142-146 , 2022 2022 Citations: 3
Dual Band Circularly Polarized Slot Antenna Loaded with Asymmetric Cross Strips TRP Kumar, R Karthik, K Krishnamoorthy 2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 1-3 , 2018 2018 Citations: 3
Rectangular slotted ground structure to reduce Mutual coupling in Microstrip Patch antenna array R Karthik, RK Manjunath, HV Kumaraswamy International Journal of Advanced Research in Electronics and communication … , 2015 2015 Citations: 3
Slot coupled dual band high gain circularly polarized metasurface antenna PK Tharehalli Rajanna, K Rudramuni, K Kandasamy International Journal of RF and Microwave Computer‐Aided Engineering 32 (8 … , 2022 2022 Citations: 2
Mutual Coupling Reduction of Microstrip Patch Antenna Array Using Slotted Ground Structure R Karthik, RK Manjunath, HV Kumaraswamy IJRET: International Journal of Research in Engineering and Technology 4 … , 2015 2015 Citations: 2
Prof. RK Manjunath and Dr. HY Kumaraswamy," Rectangular slotted ground structure to reduce Mutual coupling in Microstrip Patch antenna array," R Karthik International Journal of Advanced Research in Electronics and communication … , 2015 2015 Citations: 2
Transition-Tapered Coplanar Sensor Employing Semi-Arc Cut Resonators With Dual Perforated Arrays For Enhanced EM Glucose Detection T Sood, K Rudramuni, P Kumar, AM Almuhlafi, H Vettikalladi, A Kandwal Sensors and Actuators A: Physical, 117886 , 2026 2026
High Power Compact Doherty Power Amplifier for n8 and n106 5G Base-Station K Rudramuni, DK Sharma, K Rawat 2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1-4 , 2024 2024
Multi-Line Based Efficient and Wideband Doherty Power Amplifier: Analytical Study K Rudramuni, DK Sharma 2024 IEEE International Conference on Electronics, Computing and … , 2024 2024
CX Band Semi Disk-Ring Dual Band Shared Aperture Antenna R Thakur, R Jasrotia, P Kumar, K Rudramuni, A Kandwal 2024 IEEE Wireless Antenna and Microwave Symposium (WAMS), 1-3 , 2024 2024
