Papers by Abhijyoti Ghosh
Application of Dielectric-Artificial Magnetic Conductor Composite Substrate to Design Miniaturized P Band Microstrip Antenna for Wireless Underground Sensor Network
IEEE Antennas and Wireless Propagation Letters
Rectangular Strip Loaded Circular Patch Antenna for Simultaneous Improvement of Co polar Gain and Co Polarization to Cross Polarization radiation Separation
2022 2nd International Conference on Artificial Intelligence and Signal Processing (AISP)
A new insightful exploration into a low profile ultra-wide-band (UWB) microstrip antenna for DS-UWB applications
Journal of Electromagnetic Waves and Applications, 2021
Designing a simple and planar antenna for high speed short distance ultra-wideband (UWB) communic... more Designing a simple and planar antenna for high speed short distance ultra-wideband (UWB) communication has become a buzzword over the last few years. There are two very different categories of UWB technologies of vital relevance, i.e. (i) carrier-free direct sequence UWB (DS-UWB), and (ii) the Multi-Band orthogonal frequency division multiplexing UWB (OFDM UWB) technology. In, Multi-Band OFDM UWB technology, multi narrowband UWB antennas with frequency notches are required. However, in DS-UWB technology, the frequency spectrum of very short duration transmitted pulses occupies wide bandwidth, and hence to transmit it, the antenna should be fully matched over the entire bandwidth without the presence of any frequency notch. In this paper, a novel, small and completely planar air gap and defected ground slot integrated rectangular microstrip antenna with dual shorting posts have been thoroughly investigated to yield UWB, i.e. (109%) bandwidth without the presence of any frequency notch.
Enhancement of Co-polarization to Cross-polarization Isolation in Rectangular Patch Antenna using Circular Shorting Columns
2021 International Conference on Control, Automation, Power and Signal Processing (CAPS), 2021
In this paper a rectangular microstrip antenna with four circular shorting columns has been studi... more In this paper a rectangular microstrip antenna with four circular shorting columns has been studied for the improvement of co-polarized radiation (CR) to cross polarized radiation (XR) isolation in H plane. RT-Duroid substrate is used to designed the modified antenna. The circular shoring columns are deployed at the four corners of the patch on the substrate. The new structure provides 26.16 dB of CR-XR isolation in H plane. A co-polar gain of 8.46 dBi with stable radiation pattern has also been achieved.
Shorted Non-radiating Edges Integrated 2 × 1 Rectangular Microstrip Antenna for Concurrent Improvement of Gain and Polarization Purity
Algorithms for Intelligent Systems, 2022
Reduced-Surface-Wave-Inspired Circular Microstrip Antenna for Concurrent Improvement in Radiation Characteristics
IEEE Antennas and Wireless Propagation Letters, 2021
Classical microstrip patch antenna fabricated on a dielectric substrate suffers from poor gain, e... more Classical microstrip patch antenna fabricated on a dielectric substrate suffers from poor gain, efficiency, and high cross polarization due to the automatic excitation of TM0 surface wave. It also radiates strong fields along the horizon which is susceptible to multiple-input–multiple-output (MIMO) or array configurations. In view of this, a separate class of circular microstrip antenna known as the reduced surface wave (RSW) circular patch antenna has been proposed with a pair of shorting strips. Unlike earlier RSW-inspired antennas that mainly confirmed their ability for the successful reduction in the mutual coupling between array elements, here, and the enhancement of radiation properties is considered.
Automatic Segmentation Techniques for Brain Cancer Detection from MR Images
Advances in Intelligent Systems and Computing, 2021
Defected Ground Structure Integrated Rectangular Microstrip Patch Antenna on Semi-insulating Substrate for Improved Polarization Purity
Smart Computational Strategies: Theoretical and Practical Aspects, 2019
A simple rectangular microstrip antenna with defected ground structure on semi-insulating substra... more A simple rectangular microstrip antenna with defected ground structure on semi-insulating substrate (GaAs) has been studied to improve the polarization purity (co-polarization to cross-polarization isolation) in principle H-plane. Wide bandgap with high dielectric constant makes GaAs a very good substrate for Monolithic Microwave Integrated Circuits (MMIC). Unlike the earlier reports, the present one can exhibit much better radiation performance with the simple configuration. In the present paper, initially the effect of dielectric constant of a substrate on radiation performance of a simple conventional patch configuration has been studied and documented. Based on the investigation, defected ground structure has been employed for obtaining much better radiation characteristics. Around 69% improvement in cross-polarization isolation is revealed from the present configuration compared to classical patch antenna. Furthermore, such improvement of polarization purity is maintained over a wide elevation angle. Along with the improvement in polarization purity, the present structure also reveals a broad and stable beam pattern at its design frequency.
Circular Microstrip Antenna with Circular Shorting Posts for Improved Polarization Purity
Lecture Notes in Networks and Systems, 2021
Notched Integrated Planar Antenna for UWB Application
SSRN Electronic Journal, 2021
Study of Polarization Purity of Rectangular Microstrip Antenna Integrated with Pentagon Dumbelled Shaped Defected Ground Structure
A single element pentagon defected ground integrated rectangular microstrip antenna (RMA) on two ... more A single element pentagon defected ground integrated rectangular microstrip antenna (RMA) on two different substrates like Fr4 and RT-Duroid has been studied to improve the polarization performance of the conventional microstrip antenna. The regular pentagon defects are placed on the ground plane just below the corners of the rectangular patch and two slots are placed symmetrically below the non radiating edges of the rectangular patch to connect the pentagon heads to get the structure. Polarization purity around 28 dB and 25 dB over full elevation angle (±180°) has been achieved through the proposed structure with Fr4 substrate and RT-Duroid substrate respectively. Optimum defect size has been obtained using parametric studies in both cases. Both structure shows good impedance matching and stable radiation pattern within the operational bandwidth of the proposed structure. The defected ground structure geometry is very simple and easy to fabricate. Therefore the proposed antenna mi...
High Gain X-band Rectangular Microstrip Antenna Using Fractal Slot Geometry
This paper presents an investigation on fractal slots on a rectangular patch antenna (RMA) and it... more This paper presents an investigation on fractal slots on a rectangular patch antenna (RMA) and its suitable position on the patch for improved input and radiation characteristics of the RMA. The study has been carried out on RT duroid 5870 substrate (er = 2.33, height = 1.575 mm) using Ansoft high-frequency structure simulator (HFSS) software. Different fractal slot geometries are incorporated at the corners of the patch to achieve improved input and radiation performance. Stable radiation pattern with co-polarization gain of 9.58 dBi with 3-db beam width of 53° along with 24% active patch area reduction has been achieved through the final structure.
Rectangular Microstrip Antenna for UWB Applications
A novel air gap loaded rectangular microstrip antenna integrated with a shorting post and circula... more A novel air gap loaded rectangular microstrip antenna integrated with a shorting post and circular defected ground structure has been proposed in this paper. The proposed structure covers full C band frequency and provides 72% impedance bandwidth. The structure also provide stable radiation pattern with average gain of 5.08 dBi within the whole operating band of frequency. The detailed study has been carried out through commercially available software HFSSv13 and documented in this paper. The proposed antenna will be very much useful in the wireless communication systems which require broadband frequency range of operation.
Performance Evaluation of Rectangular Microstrip Patch Antenna based on Defected Ground Structures
Estimation of Gain Enhancement of Circular Sector Microstrip Antenna with Air Substrate
A quick hand estimation of gain enhancement with air substrate in a circular sector microstrip an... more A quick hand estimation of gain enhancement with air substrate in a circular sector microstrip antenna (CSMA) has been presented in paper. The standard gain estimation process has been carried out with 90° CSMA (air substrate) in comparison with conventional CSMA (PTFE substrate). Around 2.8 dB gain improvement has been achieved.
Application of Defected Ground Structure for Stable Gain with Ultrawide Bandwidth
Advances in Communication, Devices and Networking, 2019
A rectangular microstrip patch antenna integrated with ring-shaped defected ground structure has ... more A rectangular microstrip patch antenna integrated with ring-shaped defected ground structure has been studied for the improvement of impedance bandwidth. The use of defected ground structure (DGS) for the improvement of impedance bandwidth is a very new concept. Parametric studies have been carried out to find the optimum size of the defect. Around 46.5% impedance bandwidth (−10 dB) with 5.7 dBi peak gain is achieved with the optimum defect size. The proposed structure is very simple and easy to fabricate. The proposed structure is very much useful for the high-speed communication systems where wide impedance bandwidth along with stable radiation pattern is the primary requirement.
IEEE Antennas and Propagation Magazine, 2019
XXXXX I n this article, the key influence of the feed-probe position for the excitation of desire... more XXXXX I n this article, the key influence of the feed-probe position for the excitation of desired modes in a circular sector microstrip antenna (CSMA) is thoroughly investigated via physical analysis comprising simulations and measurements. The approximate feed location used to excite a particular mode is also empirically determined to facilitate further exploration of CSMAs. Based on the proposed analysis and simulations, CSMAs with a wide range of sector angles are studied, and good agreements are revealed when compare with the measurements.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2019
A simple rectangular microstrip antenna with triangular slotted ground plane has been studied bot... more A simple rectangular microstrip antenna with triangular slotted ground plane has been studied both theoretically and experimentally to improve shortcomings like low gain (5-6 dBi), narrow bandwidth (3%-4%), and poor copolarization (CP) to cross-polarization (XP) isolation, i.e. polarization purity (typically 10-12 dB), of conventional rectangular microstrip patch antennas. By placing two pairs of triangular shaped slots on the ground plane just below the nonradiating edges of the patch, high gain (around 9 dBi) and more than 22 dB polarization purity over a wide elevation angle has been achieved. The proposed antenna covers almost the full X band of frequency from 9.55 GHz to 11.43 GHz while resonating at 10.35GHz (i.e. impedance bandwidth of 17%), so the proposed antenna offers improved gain, impedance bandwidth, and polarization purity simultaneously as compared to conventional rectangular microstrip antennas. Parametric studies have been documented to achieve the optimum defect dimension. The specialty of the proposed antenna is that the gain and radiation pattern is quite stable in the entire operating frequency band, along with its attractive gain, impedance bandwidth, and polarization performance. The simulated and measured results show close resemblance to each other. The proposed geometry is quite simple and easy to fabricate and therefore may be ideal for applications where high gain, stable radiation characteristics, and wide impedance bandwidth along with high copolarization to cross-polarization isolation over wide elevation angles are required.
Journal of Electromagnetic Waves and Applications, 2017
A simple cross type defected ground structure (CDGS) integrated rectangular microstrip antenna (R... more A simple cross type defected ground structure (CDGS) integrated rectangular microstrip antenna (RMA) has been proposed to achieve broad bandwidth along with augmented (improved) co-polarized to cross-polarized radiation (CP-XP) isolation over principal and diagonal planes. In this design, a crucial emphasis is given for concurrent improvement of both bandwidth and polarization purity of microstrip antenna without hampering dominant mode fields. Around 25-28 dB CP-XP isolation is achieved over wide elevation angle with the proposed structure with 25% impedance bandwidth. The simulated and measured results show a close resemblance with each other. The proposed geometry is very simple, easy to fabricate and therefore helps in effortlessness manufacturing process. Therefore, the present structure appears to be ideal in numerous applications where polarization purity is the key issue over the wide bandwidth.
International Journal of RF and Microwave Computer-Aided Engineering, 2017
A simple and single element wide slot dipole loaded shorted rectangular microstrip antenna has be... more A simple and single element wide slot dipole loaded shorted rectangular microstrip antenna has been proposed and investigated experimentally for broad impedance bandwidth and improved cross polarized (XP) radiation compared to maximum copolarized (CP) gain without changing the co-polarized (CP) radiation pattern. Around 23-35 dB isolation between CP and XP radiation along with 25% impedance bandwidth is achieved with the proposed structure. The measured gain of the antenna is around 6.2 dBi over the entire band. The present antenna is very simple and easy to manufacture. Unlike the other structures, the present one is free from back radiation in terms of XP fields. The design of the antenna structure is theoretically justified and rigorously analyzed. The present investigation provides an insightful, clear visualization-based understanding of the concurrent improvement in both the impedance bandwidth and XP performance with the present structure.
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Papers by Abhijyoti Ghosh