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Temasek Laboratories

Staff Profile

Dr. Rajbala, SOLANKI, Research Scientist, email: rajbala@nus.edu.sg

Background
Dr. Solanki received her Ph.D. degree in Electrical Engineering from Indian Institute of Technology (IIT) Bombay in Feb. 2023. She joined Temasek Laboratories @ NUS as a Research Scientist in April 2023.

Professional Affiliations: Member, IEEE

Research Interests: Design and analysis of various types of antennas and arrays

Projects

Doctoral Thesis: Compact and Broadband Dipole Antennas and Arrays
The thesis work involves design and development of compact and wideband dipole antennas and arrays in sub-6 GHz frequency band. Mode compression is utilized to achieve wide bandwidth in a compact sized antenna. New configurations and techniques for mode compression of dipole antenna are proposed. The proposed antennas provide better performance in terms of larger bandwidth, improved radiation pattern and smaller antenna size.

Industry-Funded Projects:

  1. Broadband VUHF Antennas for Handheld Applications (Funded by CRL-BEL)

    • Objective: Design and development of compact and broadband antennas with stable omnidirectional radiation pattern over the desired band. The desired frequency range was huge (frequency ratio of approx. 1:17) and size was restricted to λL/17 at the lowest frequency of the operational band.
    • Lumped element loaded monopole and helical antennas were designed, developed, and tested to satisfy the design requirements.

  2. Design and Development of Antennas for Communication at TV White Space Frequency Band (Funded by MeitY)

    • Objective: Study of compact and broadband antennas for TVWS band 470 – 698 MHz.
    • Various compact and broadband configurations of stacked microstrip, and Log-periodic dipole array antennas were designed, and parametric studies were presented to analyze the design aspects of the antennas.

  3. Design of Wideband Antenna for FOPEN Radar (Funded by LRDE, DRDO)

    • Objective: To carry out research on the design of antennas which offer wideband performance in VHF band for foliage penetration radar applications.
    • Various configurations of loaded monopole and LPDAs were studied, and parametric analysis were presented to analyze the design aspects of the antennas.
Publications in Journals
  1. R. Solanki, “Third- and Fifth-Order Mode Compression of a Dipole Antenna,” in IEEE Transactions on Antennas and Propagation, vol. 70, no. 12, pp. 12294-12298, Dec. 2022, doi: 10.1109/TAP.2022.3209649. 
  2. Rajbala Solanki & Sharayu Moharir (2023) Compact and Broadband Loop-Loaded Dual-Mode Dipole Antenna, IETE Journal of Research, DOI: 10.1080/03772063.2023.2210091
  3. Rajbala Solanki, “Compact and Broadband Dual-Mode Dipole Antenna,” Progress In Electromagnetics Research Letters, Vol. 106, 21-29, 2022. doi:10.2528/PIERL22060102.
  4. Rajbala Solanki, “Compact and Broadband Uniplanar Microstrip Antenna for Endfire Radiation,” Progress In Electromagnetics Research Letters, Vol. 102, 77-85, 2022, doi:10.2528/PIERL21120202.
  5. Bindu K. K, Rajbala S, Girish Kumar & Anil K. Singh (2023) Symmetrically Direct Coupled Stacked Broadband Microstrip Antenna, IETE Journal of Research, 69:5, 2981-2990, DOI: 10.1080/03772063.2021.1908856 
  6. S. Rajbala, A. Srivastava, H.O. Pandey and V.D. Kumar, “Investigation of a cross-slot nanoantenna and extraordinary transmission,” in Micro & Nano Letters, vol. 7, no. 7, pp. 600-603, July 2012, doi: 10.1049/mnl.2012.0253. 
Publications in Conferences
  1. R. Solanki, "Stub Loaded Dual-Mode Dipole Antenna for Wide Bandwidth in a Compact Size," 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), Bangalore, India, 2022, pp. 923-927, doi: 10.1109/MAPCON56011.2022.10047301. 
  2. R. S., “Compact and Broadband Uniplanar Yagi MSA for Sub-6 GHz 5G Frequency Band,” 2021 15th European Conference on Antennas and Propagation (EuCAP), 2021, pp. 1-5, doi:10.23919/EuCAP51087.2021.9411309. 
  3. Rajbala, “Compact and Broadband LPDA with Curved Bow-Tie Elements for TVWS Band,” 2021 IEEE USNC/URSI Radio Science Meeting (Joint with AP-S Symposium), 2021, pp. 5-6. doi:10.23919/USNC-URSI51813.2021.9703467.
  4. Rajbala and B. K. K., “Broadband Direct Coupled Stacked Microstrip Antenna for TVWS Band,” 2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI), 2021, pp. 373-374, doi:10.1109/APS/URSI47566.2021.9704223.
  5. Rajbala, “Compact and Broadband LPDA With Flat-Ended Bow-Tie Elements for TVWS Band,” 2021 IEEE Indian Conference on Antennas and Propagation (InCAP), 2021, pp. 45-47, doi:10.1109/InCAP52216.2021.9726183.
  6. K. K. Bindu, R. Solanki, G. Kumar and A. K. Singh, “Broadband Symmetrically Direct Coupled Circular Microstrip Antenna,” 2021 2nd International Conference on Range Technology (ICORT), 2021, pp. 1-3. doi:10.1109/ICORT52730.2021.9581810.
  7. Rajbala and A. Srivastava, “Effect of Finite Ground Plane on Performance of Compact Air-Suspended Rectangular Microstrip Antenna for 5G Applications,” 2020 IEEE REGION 10 CONFERENCE (TENCON), 2020, pp. 901-904, doi:10.1109/TENCON50793.2020.9293816.
  8. Rajbala, K. P. Ray, and Girish Kumar, “Effect of Finite Ground Plane on the Performance of Rectangular Microwave Antennas,” in 10th International Conference on Microwaves, Antennas, Propagation and Remote Sensing (ICMARS-2014), Jodhpur: ICMARS14407, 2014, pp. 215–218.
Awards and Achievements
  • Excellence in Teaching Assistantship award at IIT Bombay for the courses: 1. Radiating Systems 2. Solid-State Microwave Devices 3. Electromagnetic Waves.
  • TICRA-EurAAP Grantee: Full registration fee and EUR 500 for the conference EuCAP 2021.
  • Secured 3rd position in the Research Conclave on ‘Evolution of RF Electromagnetics from Microwave to mmWave Technologies’ organized by VJTI, Mumbai (TEQIP III sponsored). 
  • Secured AIR 308 (99.99 Percentile) in GATE-2013 in Electronics & Communication Engineering. 
  • Awarded Merit Cum Means (MCM) scholarship by MHRD during undergraduate studies.
  • GARGI Award by the Govt. of Rajasthan for excellent performance in class X and class XII.
Work Experience:
  • Research Associate, Indian Institute of Technology Bombay, India (Aug 2022 – Jan 2023)
    Responsibilities: Research idea generation, simulation and measurements of antennas and research paper writing.
  • Guest Faculty, Indian Institute of Information Technology Kota, Rajasthan, India (July 2016 – May 2017)
    Responsibilities: Course instructor for Communication Systems, Electronic Devices and Circuits, and Control Systems. Lab instructor for Digital Electronics, and Electronic Devices and Circuits.
Position of Responsibility:
  • Teaching Assistant
    • National Programme on Technology Enhanced Learning (NPTEL): 1. Antennas, 2. Microwave Theory and Techniques.
      Delivered lectures on Waveguides and Microwave Tubes for NPTEL, MHRD.
    • IIT Bombay: 1. Radiating Systems, 2. Solid-state Microwave Devices and Applications, 3. Advanced Antennas, 4. Electromagnetic Waves, 5. Electromagnetic Interference and Compatibility, 6. Digital Communications.
  • Instructor
    • Co-conducted two courses at BEL Academy for Excellence (BAE), Bengaluru: 1. Modern Antennas: Concepts and Design, 2. RF and Microwave.
    • Delivered a talk on high frequency electromagnetics at Training Program on “Electromagnetic Fields and Waves: Theory and Applications” Under Continuing Education Programme, IIT Bombay.

    • Reviewer: Reviewed research papers of IEEE Access, IETE Journal of Research, Electronic Letters and IET Microwaves Antennas & Propagation.
    • Student Senate Member in PDPM IIITDM Jabalpur. (Jan 2012 – May 2012)
    • Assistant Coordinator in the Counseling Service, PDPM IIITDM Jabalpur. (Jul 2010 – May 2012)
    • Student Guide in the Counseling Service, PDPM IIITDM Jabalpur. (Jul 2009 – May 2010)