VENKATA KISHORE KOTHAPUDI | VIT University (original) (raw)
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Papers by VENKATA KISHORE KOTHAPUDI
In this letter, the achievability of an unequal power divider utilizing a microstrip innovation a... more In this letter, the achievability of an unequal power divider utilizing a microstrip innovation as a part of the P/UHF band is designed. Methods/Statistical Analysis: Unequal power divider with 3-alternatives/approaches is composed in this research work, these are traditional microstrip configuration, power divider with input transformer and discretionary outline impedance (A-arbitary) is acquainted with control high impedance values and Power divider with general outline comparisons (Determination of Z1 or Z2 with required Impedances). Findings: At long last Power divider with general outline comparisons is figured it out. In this case the impedance of any one of the quarter wave impedance transmission line chosen is 30/35Ω which is most appropriate for impedance confinement of 10-60 ohm with a large power partitioning proportion radar applications where the side projection levels are most negative required. The unequal amplitudes of the 8-way power divider is designed utilizing Taylors 1-parameter method to get the side projections levels -17 dB down from the fundamental beam. Application/Improvements: The 2-way and 8-way power divider was simulated using Method of Moments based Zealand IE3D software (MOM) an aggregate bandwidth of 40MHz was accomplished at an resonant frequency 0.43GHz. The simulated 2-way and 8-way unequal power divider is simulated and results are given. A prototype of 2-way unequal power divider with power levels P1 and P2 are 0.79622 and 0.89352 with power ratio of 1.1222 is fabricated to verify our proposed design. Measured results are given good agreement with simulated results to confirm our proposed design.
Background/Objectives: This letter describes the design simulation and fabrication the design, si... more Background/Objectives: This letter describes the design simulation and fabrication the design, simulation and fabrication of an P-band frequency band unequal amplitude 0 90 hybrid coupler. This hybrid coupler is used to design a feeder network with 4 output ports for T-Radar Wind Profiler Operating at 430MHz is achieved with a frequency bandwidth exceeding 50MHz. Methods/Statistical Analysis: The hybrid coupler is designed with the help of conventional microstrip technology. Measured and simulation results has been provided for the components (Equal amplitude hybrid couplers, Unequal amplitude hybrid coupler) used to implement the feeder network. The microstrip hybrid coupler with unequal amplitudes with 90 0 phase difference is achieved with varying impedances of the one of the arms in a hybrid coupler. Findings: The proposed coupler is easily fabricated on the glass epoxy PCB without any lumped element. There is a good agreement between measured, simulated and theoretical prediction validated the feasible configuration of the proposed coupler and amplitude weights are designed based on array synthesis so called Taylors 1-parameter method for side lobe level -17 dB down from the main beam. A full wave EM simulator zeland IE3D V12.02 and Ansoft designer is used for designing hybrid coupler. Applications/ Improvements: The fabricated coupler is best suited for shared aperture antenna beam forming network and Feeder network using hybrid coupler for 430 MHz Radar applications. To demonstrate our design theory, a practical unequal power hybrid coupler is designed, simulated and fabricated. The measured results shows that the Return losses are larger than 25dB. The power couplings S21 and S31 is -4.38 dB and -3.17 dB and the output phase difference is 88.318 0 at the operating frequency.
2015 International Conference on Signal Processing and Communication Engineering Systems, 2015
In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a c... more In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a conventional microstrip technology in the 430MHz UHF band is proposed for Tropospheric wind profiling radar. Feeder network with unequal amplitude is designed based on the side lobe level requirement -17db down from the main beam. The theoretical design and simulated results are presented to verify our proposed design. The main advantage of this present design is to reduce the complexity in Transmit-Receive module.
2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2015
2015 IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), 2015
In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a c... more In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a conventional microstrip technology in the 430MHz UHF band is proposed for Tropospheric wind profiling radar. Feeder network with unequal amplitude is designed based on the side lobe level requirement -17db down from the main beam. The theoretical design and simulated results are presented to verify our proposed design. The main advantage of this present design is to reduce the complexity in Transmit-Receive module.
This paper describes the design and Simulation of an 0.43GHz ultra high frequency band microstrip... more This paper describes the design and Simulation of an
0.43GHz ultra high frequency band microstrip patch antenna
single element and 8-element linear array using RT/Duroid 5870
substrate material with an inter-element spacing of 0.71λ for
limited scan angle coverage. Wind profiling radar operating in
Doppler beam swinging mode and spaced antenna drift technique
mode needs to have a large aperture antenna array in order to get
the narrow pencil beam is required for wind speed and direction
accuracy. To meet the above requirements a microstrip patch
antenna single element is used to design a 8-element linear
antenna array for Tropospheric Wind Profiling Radar Operating
at 0.43GHz. The patch antenna is simulated on a microstrip
structure using conventional microstrip technology process.
Conception details and simulation results are also given for the
both single element and 8-element linear antenna array. The
designed and simulated results are presented to verify our
proposed area. A full wave electromagnetic simulator zeland
IE3D V12.02 is used to validate the design approach. The
simulated results below present are valid over the 0.43GHz band
and the simulated parameters contains the VSWR, Return loss,
impedance, gain, directivity, efficiency and elevation gain
patterns.
In this paper, an 8-port unequal amplitude equal phase power divider with arbitrary power divisio... more In this paper, an 8-port unequal amplitude equal phase power
divider with arbitrary power divisions terminated by arbitrary impedance is
considered and is useful for both component miniaturization and easy design
facilities due to as many sets of design equations as possible. Arbitary
design impedance technology in the UHF band is proposed. The Power
divider with input transformer & arbitrary design impedance (A) is introduced
to control high impedance values. Here the impedance of one of the
transmission line selected is 15 ohm[a], which is best suited for the
impedance limitation of 20 -80 with a large power dividing ratio in
tropospheric wind profiling radar operating at 430MHz applications where the
low side lobe levels are required. The simulated results are presented to
verify our proposed design.
Index Terms Characteristic impedance, UHF, Arbitary impedance
A Multiband vivaldi antenna is designed to operate in the X and Ku bands and simulational results... more A Multiband vivaldi antenna is designed to operate in the X and Ku bands and simulational results are presented in this
paper. Along with the ultrawide band, this particular vivaldi antenna is working in the range between 7 to 20 GHz at different
resonent frequencies. Gain of more than 9dB and bandwidth enhancement of 0.92% can be achieved using this model. All the
antenna parameters including design considerations and field distributions are presented in this paper.
This paper describes the RF signal distribution network (or) subsystem for the atmospheric radar ... more This paper describes the RF signal distribution network (or) subsystem for the atmospheric radar (or)
wind profiling radar. Wind profiler system is used to find the wind profiles in the layers of the atmosphere. The principle
of operation of WPR is Electromagnetic pulse waves radiated by the radar antenna and propagate toward the sky. During
the propagation, the electromagnetic pulse waves experience random refractivity fluctuations caused by atmospheric
turbulence and are scattered. Parts of the scattered pulse waves (echoes) then return to the radar with very low level
signals say -100dBm.In order to compensate these low level signals ,we use low noise amplifier(LNA) in the RF frontend
radar receiver without any degradation in signal-to-noise ratio. The RF distribution network plays a major role in
wind profiler radar. The RF distribution subsystem is to distribute the RF signal from antenna to 4-Way power divider to
produce 4-outputs of reception by receivers over the frequency band. Unit provides maximum coupling between single
antenna and four receivers with no degradation in Signal-to-noise to Ratio. Interaction between receivers is minimized
by high isolation between any two output ports of coupler. The amplitude and phase response are flat due to broad band
devices used in realization.
VHF/UHF Radars use yagi-uda antenna in an array configuration for various applications including ... more VHF/UHF Radars use yagi-uda antenna in an array configuration for various applications including phased Doppler radars to probe atmosphere. Wind profiler system is used to find the wind profiles in the layers of the atmosphere. The main aim of this paper is to design a 3-element yagi-uda antenna for wind profiler radar system. The simulations of yagi-uda antenna are carried out using windows based 4NEC2 antenna modeler. The radiation characteristics that are usually of interest in the yagi-uda antenna are forward and backward Gain, Input impedance, bandwidth, beamwidth front to back ratio, VSWR, and magnitude of major lobes and minor lobes of a typical 3-element yagi-uda antenna operating at VHF-Band used in wind profiler radar systems.
In this letter, the achievability of an unequal power divider utilizing a microstrip innovation a... more In this letter, the achievability of an unequal power divider utilizing a microstrip innovation as a part of the P/UHF band is designed. Methods/Statistical Analysis: Unequal power divider with 3-alternatives/approaches is composed in this research work, these are traditional microstrip configuration, power divider with input transformer and discretionary outline impedance (A-arbitary) is acquainted with control high impedance values and Power divider with general outline comparisons (Determination of Z1 or Z2 with required Impedances). Findings: At long last Power divider with general outline comparisons is figured it out. In this case the impedance of any one of the quarter wave impedance transmission line chosen is 30/35Ω which is most appropriate for impedance confinement of 10-60 ohm with a large power partitioning proportion radar applications where the side projection levels are most negative required. The unequal amplitudes of the 8-way power divider is designed utilizing Taylors 1-parameter method to get the side projections levels -17 dB down from the fundamental beam. Application/Improvements: The 2-way and 8-way power divider was simulated using Method of Moments based Zealand IE3D software (MOM) an aggregate bandwidth of 40MHz was accomplished at an resonant frequency 0.43GHz. The simulated 2-way and 8-way unequal power divider is simulated and results are given. A prototype of 2-way unequal power divider with power levels P1 and P2 are 0.79622 and 0.89352 with power ratio of 1.1222 is fabricated to verify our proposed design. Measured results are given good agreement with simulated results to confirm our proposed design.
Background/Objectives: This letter describes the design simulation and fabrication the design, si... more Background/Objectives: This letter describes the design simulation and fabrication the design, simulation and fabrication of an P-band frequency band unequal amplitude 0 90 hybrid coupler. This hybrid coupler is used to design a feeder network with 4 output ports for T-Radar Wind Profiler Operating at 430MHz is achieved with a frequency bandwidth exceeding 50MHz. Methods/Statistical Analysis: The hybrid coupler is designed with the help of conventional microstrip technology. Measured and simulation results has been provided for the components (Equal amplitude hybrid couplers, Unequal amplitude hybrid coupler) used to implement the feeder network. The microstrip hybrid coupler with unequal amplitudes with 90 0 phase difference is achieved with varying impedances of the one of the arms in a hybrid coupler. Findings: The proposed coupler is easily fabricated on the glass epoxy PCB without any lumped element. There is a good agreement between measured, simulated and theoretical prediction validated the feasible configuration of the proposed coupler and amplitude weights are designed based on array synthesis so called Taylors 1-parameter method for side lobe level -17 dB down from the main beam. A full wave EM simulator zeland IE3D V12.02 and Ansoft designer is used for designing hybrid coupler. Applications/ Improvements: The fabricated coupler is best suited for shared aperture antenna beam forming network and Feeder network using hybrid coupler for 430 MHz Radar applications. To demonstrate our design theory, a practical unequal power hybrid coupler is designed, simulated and fabricated. The measured results shows that the Return losses are larger than 25dB. The power couplings S21 and S31 is -4.38 dB and -3.17 dB and the output phase difference is 88.318 0 at the operating frequency.
2015 International Conference on Signal Processing and Communication Engineering Systems, 2015
In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a c... more In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a conventional microstrip technology in the 430MHz UHF band is proposed for Tropospheric wind profiling radar. Feeder network with unequal amplitude is designed based on the side lobe level requirement -17db down from the main beam. The theoretical design and simulated results are presented to verify our proposed design. The main advantage of this present design is to reduce the complexity in Transmit-Receive module.
2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2015
2015 IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), 2015
In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a c... more In this paper, the feasibility of an 8-way unequal amplitude equal phase power splitter using a conventional microstrip technology in the 430MHz UHF band is proposed for Tropospheric wind profiling radar. Feeder network with unequal amplitude is designed based on the side lobe level requirement -17db down from the main beam. The theoretical design and simulated results are presented to verify our proposed design. The main advantage of this present design is to reduce the complexity in Transmit-Receive module.
This paper describes the design and Simulation of an 0.43GHz ultra high frequency band microstrip... more This paper describes the design and Simulation of an
0.43GHz ultra high frequency band microstrip patch antenna
single element and 8-element linear array using RT/Duroid 5870
substrate material with an inter-element spacing of 0.71λ for
limited scan angle coverage. Wind profiling radar operating in
Doppler beam swinging mode and spaced antenna drift technique
mode needs to have a large aperture antenna array in order to get
the narrow pencil beam is required for wind speed and direction
accuracy. To meet the above requirements a microstrip patch
antenna single element is used to design a 8-element linear
antenna array for Tropospheric Wind Profiling Radar Operating
at 0.43GHz. The patch antenna is simulated on a microstrip
structure using conventional microstrip technology process.
Conception details and simulation results are also given for the
both single element and 8-element linear antenna array. The
designed and simulated results are presented to verify our
proposed area. A full wave electromagnetic simulator zeland
IE3D V12.02 is used to validate the design approach. The
simulated results below present are valid over the 0.43GHz band
and the simulated parameters contains the VSWR, Return loss,
impedance, gain, directivity, efficiency and elevation gain
patterns.
In this paper, an 8-port unequal amplitude equal phase power divider with arbitrary power divisio... more In this paper, an 8-port unequal amplitude equal phase power
divider with arbitrary power divisions terminated by arbitrary impedance is
considered and is useful for both component miniaturization and easy design
facilities due to as many sets of design equations as possible. Arbitary
design impedance technology in the UHF band is proposed. The Power
divider with input transformer & arbitrary design impedance (A) is introduced
to control high impedance values. Here the impedance of one of the
transmission line selected is 15 ohm[a], which is best suited for the
impedance limitation of 20 -80 with a large power dividing ratio in
tropospheric wind profiling radar operating at 430MHz applications where the
low side lobe levels are required. The simulated results are presented to
verify our proposed design.
Index Terms Characteristic impedance, UHF, Arbitary impedance
A Multiband vivaldi antenna is designed to operate in the X and Ku bands and simulational results... more A Multiband vivaldi antenna is designed to operate in the X and Ku bands and simulational results are presented in this
paper. Along with the ultrawide band, this particular vivaldi antenna is working in the range between 7 to 20 GHz at different
resonent frequencies. Gain of more than 9dB and bandwidth enhancement of 0.92% can be achieved using this model. All the
antenna parameters including design considerations and field distributions are presented in this paper.
This paper describes the RF signal distribution network (or) subsystem for the atmospheric radar ... more This paper describes the RF signal distribution network (or) subsystem for the atmospheric radar (or)
wind profiling radar. Wind profiler system is used to find the wind profiles in the layers of the atmosphere. The principle
of operation of WPR is Electromagnetic pulse waves radiated by the radar antenna and propagate toward the sky. During
the propagation, the electromagnetic pulse waves experience random refractivity fluctuations caused by atmospheric
turbulence and are scattered. Parts of the scattered pulse waves (echoes) then return to the radar with very low level
signals say -100dBm.In order to compensate these low level signals ,we use low noise amplifier(LNA) in the RF frontend
radar receiver without any degradation in signal-to-noise ratio. The RF distribution network plays a major role in
wind profiler radar. The RF distribution subsystem is to distribute the RF signal from antenna to 4-Way power divider to
produce 4-outputs of reception by receivers over the frequency band. Unit provides maximum coupling between single
antenna and four receivers with no degradation in Signal-to-noise to Ratio. Interaction between receivers is minimized
by high isolation between any two output ports of coupler. The amplitude and phase response are flat due to broad band
devices used in realization.
VHF/UHF Radars use yagi-uda antenna in an array configuration for various applications including ... more VHF/UHF Radars use yagi-uda antenna in an array configuration for various applications including phased Doppler radars to probe atmosphere. Wind profiler system is used to find the wind profiles in the layers of the atmosphere. The main aim of this paper is to design a 3-element yagi-uda antenna for wind profiler radar system. The simulations of yagi-uda antenna are carried out using windows based 4NEC2 antenna modeler. The radiation characteristics that are usually of interest in the yagi-uda antenna are forward and backward Gain, Input impedance, bandwidth, beamwidth front to back ratio, VSWR, and magnitude of major lobes and minor lobes of a typical 3-element yagi-uda antenna operating at VHF-Band used in wind profiler radar systems.