Puneeth Kumar T R
@nitk.ac.in
Department of Electronics and Communication Engineering
National Institute of Technology Karnataka, Mangalore, India
Scopus Publications
Scopus Publications
Sateesh Kumar T R, Puneeth Kumar Tharehalli Rajanna, Deepika P N, Soniya S S, Yashaswini H M, and Bhavyashree K V
IEEE
In this paper, a single stage Low Noise Amplifier (LNA) based on MMIC technology is proposed. A Ga N HEMT transistor is chosen to achieve the required peak gain of 15.5dB and minimum noise figure of 0.22 dB at 2.4GHz. The device is unconditionally stable in its operating frequency range to avoid oscillations. The designed amplifier has simple input and output matching networks. Since the chosen HEMT transistor is wideband device operating between 0 to 6GHz and proposed model is simple, It is well suitable for sub-6GHz 5G applications like ISM band, GPS receivers, cordless phones, WLANs and space communications.
Punneth Kumar Tharehalli Rajanna, Krishnamoorthy Kandasamy, and Pratik Mevada
The Electromagnetics Academy
|An asymmetric coplanar waveguide (CPW) fed wideband circularly polarized monopole antenna with a slot structure is proposed in this article. Phase gradient metasurface (PGM) is placed beneath the monopole to improve the gain. Circular polarization (CP) is achieved over wide bandwidth by combining the monopole and slot modes. The asymmetric CPW-fed monopole antenna provides CP at lower frequencies, and slot mode provides CP at higher frequencies. The asymmetric ground plane in the monopole and asymmetric strips in the slot are combined to produce wide axial ratio bandwidth. The proposed design’s detailed construction and operation are discussed with experimental validation. The proposed wideband CP antenna provides an impedance bandwidth of 95 : 46% and axial ratio bandwidth of 67 : 61%. The peak gain of 5.2 dBic is obtained at 2.35 GHz with 2 dB variation over operating bandwidth. The obtained radiation patterns provide good broadside radiation with better cross-polarization levels than co-polarization.
Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, and Krishnamoorthy Kandasamy
Wiley
D. S. Arun Kumar, T. R. Puneeth Kumar, K. Krishnamoorthy, P. Devadas Bhat, and M. R. Rahman
Institute of Electrical and Electronics Engineers (IEEE)
The present work focuses on the development of cotton fabric with multi-walled carbon nanotube coating (CMC) through a dip and dry process. The influence of multi-walled carbon nanotubes (MWCNTs) concentration on transmission, reflection, and absorption properties, which leads to an estimation of electromagnetic interference (EMI) shielding, was also studied. The merits of MWCNTs coating on the cotton fabric were evaluated using field-emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and surface resistivity. The Fourier transform infrared (FTIR) spectroscopy result supports the bonding between MWCNTs and cotton fabric. The significant increase of 98.9% of EMI shielding for the highest MWCNTs weight percentage (22.23 wt%) was attributed due to the well-interconnected network of MWCNTs. The shielding mechanism in the high wt% MWCNTs samples is dominated by both reflection and absorption properties.
T. Yerriswamy, Praveen H. L, T R Puneeth Kumar, and Ravi Hosamani
IEEE
For millimeter-wave applications, a corner perturbated right hand circularly polarized patch antenna has been proposed. To obtain two degenerative modes required for circular polarization, the square patch antenna is perturbated at its two diagonal corners. A quarter wave transformer is used to match the impedance. The antenna is designed to operate at 28 GHz, which is the resonance frequency. The proposed antenna has an impedance bandwidth |S11| (<-10 dB)between 27.671 to 29.294 GHz(5.6982%) and axial ratio(< 3dB) bandwidth between 28.303 GHz to 29.146 GHz (2.934%).The gain is larger than 6 dBi, and the radiation efficiency is over 90%. The proposed antenna has a low profile, a high gain, and a high radiation efficiency, making it ideal for millimeter-wave applications.
S T Gowthami and Puneeth T R Kumar
IEEE
In this work, a circularly polarized (CP) dual band corner extended slot antenna loaded with a split ring resonator (SRR), which is modified in its structure, is presented. The antenna operates in two bands. The lower resonance frequency is obtained due to the slot dimension. The slot antenna is excited using them microstrip feed line. The corner extended slot antenna produce two degenerative modes which are require to obtain CP in the lower resonant frequency. An SRR is etched on a corner of the slot structure to obtain the upper resonance frequency. The slot antenna produce magnetic field which is axial in direction to modified SRR and excites it. To achieve CP in the upper frequency band, strips with asymmetric in nature are introduced in the SRR which creates equal magnitude with a 90° phase. The CP antenna with dual band characteristics is capable of tuning the resonance frequencies and polarization sense independently in each frequency band. The designed antenna is operated at 1.58 GHz and 1.95 GHz. The simulated results shows that the lower resonant frequency has a −10 dB impedance bandwidth from 1.47GHz-1.62GHz and upper resonant frequency from 1.84 GHz-2.08 GHz. A 200MHz of axial ratio (<3dB) bandwidth in the lower resonant frequency and 130MHz in the upper resonant frequency is obtained respectively. The simulated radiation efficiency of >75% is achieved in both bands.
Puneeth Kumar T.R, Karthik. R, and Krishnamoorthy. K
IEEE
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.
Karthik Rudramuni, Basudev Majumder, Puneeth Kumar Tharehhalli Rajanna, Krishnamoorthy Kandasamy, and Qingfeng Zhang
Institute of Electrical and Electronics Engineers (IEEE)
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.
Puneeth Kumar Rajanna, Karthik Rudramuni, and Krishnamoorthy Kandasamy
Cambridge University Press (CUP)
AbstractThis paper presents a novel design of a low profile circularly polarized (CP) metasurface (MTS) antenna with in-band radar cross-section (RCS) reduction property. The MTS is loaded as a superstrate on slot antenna and it can be viewed as a polarization-dependent MTS (PDMTS). The rectangular patch-based PDMTS is analyzed using characteristic mode analysis to find two orthogonal degenerate modes, which produces CP waves. Linearly polarized slot antenna is used to excite the PDMTS. The performance of PDMTS loaded slot antenna is analyzed numerically using full-wave analysis method. The PDMTS CP antenna is fabricated and its performance is tested experimentally. The proposed antenna has a compact structure and it has an overall size of $0.52{\\lambda _0}\\times 0.52{\\lambda _0} \\times 0.078{\\lambda _0}$ (where ${\\lambda _0}$ is the free space wavelength). The measured results show that the PDMTS antenna achieves $-10\\,{\\rm dB}$ impedance bandwidth of 29.41$\\%$, 3-dB axial ratio bandwidth of 9.05$\\%$, broadside gain of 6.34 dB, and monostatic RCS reduction of $-30.2\\,{\\rm dBsm}$ at the resonant frequency of 5.86 GHz. The simulated results are in well agreement with the measured results and it is well suited for C-band Radar and Satellite communication.
Karthik Rudramuni, Puneeth K. T. Rajanna, Krishnamoorthy Kandaswamy, Basudev Majumder, and Qingfeng Zhang
Wiley
Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, and Krishnamoorthy Kandasamy
Wiley
Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, and Krishnamoorthy Kandasamy
Institute of Electrical and Electronics Engineers (IEEE)
In this letter, a novel high-gain circularly polarized (CP) antenna based on the zero-index metamaterial (ZIM) is presented. A square ring with two asymmetrical splits is used as a unit cell to achieve high gain and circular polarization. The 9 × 9 periodic array unit cells act as an aperture efficient focusing metasurface lens and polarization converter for a primary source antenna. The focusing effect of the ZIM enhances the gain of the microstrip patch antenna placed above it by an amount of 5–6 dB. Also, the ZIM converts the linearly polarized wave emitted by the patch antenna into circularly polarized waves. The circular polarization is achieved by optimizing the two split gaps on the ring of the unit cell, which gives two orthogonal polarizations with the required phase. The proposed design is fabricated and verified experimentally. The prototype has measured impedance bandwidth from 7.04 to 7.68 GHz. The 3 dB axial ratio is achieved from 7.11 to 7.56 GHz, with a peak gain of 12.31 dBic at 7.45 GHz. The gain of around 11.5 dBic is achieved over the entire CP bandwidth with a good cross-polarization level.
Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, and Krishnamoorthy Kandasamy
Korean Institute of Electromagnetic Engineering and Science
This paper presents the design of a coplanar waveguide (CPW)-fed single-layer wideband circularly polarized (CP) planar slot antenna backed by a frequency selective surface (FSS). The planar slot antenna is fed with a stub-loaded modified CPW feed line to tune and optimize the impedance bandwidth. The corners of the square slot antenna are perturbed to produce two orthogonal degenerate modes required for a wideband CP operation. The FSS layer is placed under the slot antenna to increase the gain and axial ratio bandwidth. The measured results of the proposed antenna provide an impedance bandwidth of 63.22% and an axial ratio bandwidth of 31.14% with a peak gain of 4.87 dB. The proposed antenna has a simple geometry, a wide CP bandwidth, and a good gain.
T.R. Puneeth Kumar, R Karthik, and K Krishnamoorthy
IEEE
In this paper, a dual band circularly polarized (CP) slot antenna loaded with asymmetric cross strips is proposed. It consists of a corner perturbed slot and two asymmetric strips oriented diagonally with the slot. The slot antenna is excited by $50\\Omega$ microstrip line. The proposed antenna resonates at 2.7 GHz and 3.2 GHz. Two orthogonal degenerate modes produced by the perturbed slot antenna gives CP in lower band and the combination of slot and strip mode gives CP in upper band. The proposed antenna is fabricated and experimentally verified with axial ratio (AR) bandwidth of 13.27% and 13.31% in lower and upper band respectively. The peak gain of 4.68 dB at lower band and 4.81 dB at upper band is achieved. The simulated and measured results are in well agreement and it is good candidate for WiMax and WLAN applications.
Vikrant Bande, Puneeth T.R Kumar, and K. Krishnamoorthy
IEEE
A rectangular slotted patch antenna with circular rings as parasitic element for accomplishing dual-band dual-sense circular polarization (CP) for wireless application is presented in this paper. The proposed antenna is of compact size having dimension of $31\\times 21\\times 1.575\\mathbf{mm}^{3}$. The dual band is achieved by square patch with multiple slots along with Circular ring like structure on backside. The given antenna consist of two resonating frequency band 4.25 GHz and 5 GHz, while considering return loss as $\\mathbf{S}_{11} < -10\\mathbf{dB}$ and the 3-dB axial ratio (AR) bandwidth of 1.8% (from 4.18 to 4.257 GHz) and 2.8% (from 4.94 to 5.08 GHz) in lower and upper bands, respectively. The proposed antenna is fabricated and tested experimentally. The measured and simulation results are in agreement.
Karthik Rudramuni, Krishnamoorthy Kandasamy, Qingfeng Zhang, Xiao-Lan Tang, Abhishek Kandwal, Puneeth Kumar Tharehalli Rajanna, and Haiwen Liu
Institute of Electrical and Electronics Engineers (IEEE)
A Goubau-line leaky-wave antenna (LWA) with a large scanning angle is presented in this letter. In contrast to the conventional Goubau-line leaky wave with a small scanning angle range, this letter employed a periodically bending Goubau line, which not only brings in a periodic perturbation for leaky-wave radiation, but also enhances the scanning range due to the increased delay for each line element. The simulation and experimental results show that the proposed LWA provides $90\\%$ radiation efficiency and 7–10 dBi radiation gain from backfire to endfire through broadside as frequency changes. The proposed antenna features good radiation performance and has a compact and low-profile configuration.