Institute of Radio Physics and Electronics

The usefulness of ground-based radiometry for continuous monitoring of atmospheric parameters has been demonstrated for quite some time. A dual frequency microwave radiometer operating at 23.8 and 31.4 GHz can give the estimates of atmospheric water vapour and liquid water contents separately. The frequency 23.8 GHz being near to the water vapour absorption line is more sensitive to water vapour content than the liquid water of the atmosphere, whereas 31.4 GHz is significantly less sensitive to water vapour but is substantially more sensitive to liquid water. Hence, combining the observations at these two frequencies, liquid water and water vapour could be monitored separately and simultaneously.

Estimate of Climatic Parameters for Indian Region

The study of climatic parameters will be continued using the data from a number of sources namely, (i) Radiosonde, (ii) Satellite data (CHAMP, TRMM etc.), (iii) NMRF, (iv) Radiometers (operating at Darjeeling and Kolkata), (v) Propagation experiments at Kolkata and Darjeeling.

Communication
Optical Communication
It is planned to extend the study of dense wavelength division multiplexed systems and some software are being procured to study these transmission impairments in the physical layer of DWDM network. The design parameters will also be re-estimated by replacing the standard Gaussian Probability Distribution Function (PDF) by more accurate analytical PDF.

ANNEXURE – VI(A)
Research Publications in Journals

No	Name of Teacher	Title, journal, vol, page, year
	A Kundu, B. Bandyopadhyay A N Dutta	Iterative algorithm for microwave tomography using Lavenberg-Marquardt regularization technique Indian Journal of Pure and Applied Physics, Vol. 43, pp 649-653, September 2005.
	Bratati Mukhopadhyay and P.K. Basu	Expression for fundamental absorption coefficient due to alloy-disorder scattering in indirect gap semiconductors (communicated).
	Bratati Mukhopadhyay, Sumitra Ghosh and P.K. Basu	Estimation of the composition of Ge rich Si1-x-yGexCy layers on Si for photodetection at 1.3 and 1.55 ms (revised ms. communicated to Opt. Engg.).
	Subal Kar	Computer-aided numerical characterization and experimental studies for high power operation of IMPATT oscillator Microwave and Optical Technology Letters, vol.45, no. 3, pp 262 – 265, May 2005
	Mukul. K. Das, N. R. Das and P. K. Basu	Effect of Ge-Composition on the Performance of a SiGe/Si Heterojunction Bipolar Transistor Microwave and Optical Technology Letters, Vol. 47, pp.247-254, 2005.
	N. R. Das and M. Jamal Deen	A Model for the Performance Analysis and Design of Waveguide PIN Photodetectors IEEE Transaction on Electron Devices, Vol. 52, pp.465-472, 2005
	N. R. Das and Alakananda Mitra	A new approach to the modeling of Si – RFIC inductor, Microwave and Optical Technology Letters (to be published)
	A.Dasgupta, A.Das, D. Hui, K. K. Bandyopadhyay, M. R. Sivaraman	Ionosphrtic perturbations observed by the GPS following the December 26^th, 2004 Sumatra-Andaman earthquake Earth Planets Space, 58, pp. 167-172, 2006
	A.K. Dasgupta A. Paul, S. Ray, A. Das and S. Ananthakrishnan	Equatorial Bubbles as observed with GPS measurements over Pune, India Radio Sci., 2006 (in press)
	B. K. De, M. Pal, S. S. De, R. Bera, S. K. Adhikari, A. Guha and S. K. Sarkar	Studies on Integrated Field Intensity of ELF-VLF Sferics at Tripura Indian J. Radio & Space Phys., 34, 408, 2005.
	S. S. De, S. K. Adhikari, A. Debnath and P. Das	Studies on Non-Linear Heating of the Lower Ionosphere during Interaction between HF and ELF Signals Indian J. Radio & Space Phys., 34, 413, 2005.
	S. S. De, B. K. De, S. K. Adhikari, S. K. Sarkar, R. Bera, A. Guha and P K Mandal	A Report on Some Specific Features of the Atmospheric Electric Potential Gradient in Kolkata Indian J. Phys., 80,167, 2006.
	S. S. De, B. K. De, S. K. Adhikari, B. K. Sarkarand A. Guha	Study of Amplitude Spectrum of VLF Sferics and Vertical Electric Field at Kolkata. Indian J. Radio & Space Phys., in press, scheduled to be published in April 2006
	D. Guha, M. Biswas and Y. M. M. Antar	Microstrip patch antenna with defected ground structure for cross polarization suppression IEEE Antennas and Wireless Propagation Letters, Vol. 4, pp. 455-458, 2005
16.	D. Guha, Y. M. M. Antar, J. Y. Siddiqui and M. Biswas D.Guha, L.C.Y.Chu, Y.M.M.Antar	Resonant resistance of probe and microstrip line-fed circular microstrip patches IEE Proc. Microwaves Antennas Propagat., Vol. 152, No.6, pp. 481-484, Dec. 2005. Shaped ultra wideband cylindrical dielectric resonator antenna for wireless communications, under review at Microwave and Optical Technology Letters, 2006.
17.	S. S. Iqbal, J. Y. Siddiqui and D. Guha	Performance of compact integratable broadband antenna Electromagnetics, (USA) No. 4, vol. 25, pp.317-327, May-June 2005.
18.	S. S. Iqbal, M. Biswas, J. Y. Siddiqui and D. Guha	Performance of cavity backed inverted microstrip broadband antenna Indian J. Radio and Space Phys., vol. 35, pp.54-58, Feb. 2006.
19.	D. Guha and Y. M. M. Antar	Circular microstrip patch loaded with balanced shorting pins for improved input impedance IEEE Antennas and Wireless Propagation Letters, 2006 (to appear).
20.	D. Guha and Y. M. M. Antar	Four-element cylindrical dielectric resonator antenna for wideband monopole-like radiation IEEE Transactions on Antennas and Propagation, 2006 (to appear).
21.	D. Guha, S. Biswas, M. Biswas, J. Y. Siddiqui and Y. M. M. Antar	Concentric Ring Shaped Defected Ground Structures for Microstrip Circuits and Antennas under review at IEEE Microwave and Wireless Component Letters, 2006.
22.	D. Guha and Y. M. M. Antar	New half-hemispherical dielectric resonator antenna array for broadband monopole-type radiation under review at IEEE Transactions on Antennas and Propagation, 2006
23.	L. C. Y. Chu, D. Guha and Y. M. M. Antar	Comb-shaped wide band dielectric resonator antenna under review at Electronic Letters, 2006
24.	D. Guha, Y. M. M. Antar, A. Ittiboon, A.Petosa, and A.D. Lee	Improved design guidelines for the ultra wideband monopole-dielectric resonator antenna under review at IEEE Antennas and Wireless Propagation Letters, 2006.
25.	D. Guha, S. Biswas, M. Biswas, J. Y. Siddiqui and Y. M. M. Antar	Concentric Ring Shaped Defected Ground Structures for Microstrip Circuits and Antennas under review at IEEE Antennas and Wireless Propagation Letters, 2006
26.	D. Guha, J. Y. Siddiqui and M. Biswas	Accurate formulation for feed Reactance of Probe-fed rectangular and circular microstrip patches under review at IEE Proc. Microwaves, Antennas and Propagation, 2005
27.	A. Maitra and T. Rakshit Ghosh	Modelling of weighted mean temperature for retrieval of atmospheric water vapour using GPS in the Indian region, Indian Journal of Radio & Space Physics, 2006, communicated.
28.	A.Paul, S.K. Chakraborty, A. Das and A. DasGupta	Estimation of Satellite-Based Augmentation System Grid Size at Low Latitudes in the Indian Zone NAVIGATION, 52, 1, 15-22, 2005.
29.	N.N.Purkait M.K.Sengupta, Sanghamitra De and D.K.Chakraborty	Methane emission from the rice fields of West Bengal over a decade Indian Journal of Radio & Space Physics, Vol. 34, pp 255-263, August 2005.
30.	S. Ray, A. Paul and A. DasGupta	Equatorial Scintillations in Relation to the Development of Ionization Anomaly Ann. Geo. Phys., 2006 (in press)
31.	Amlan Mazumdar, A. Shah, M. Gokhale, Susanta Sen, S. Ghosh, B. m. Arora, D. Tsui	High-responsivity high-gain In0.5Ga0.47As/InP quantum-well infrared photodetectors grown using metal-organic vapor phase epitaxy, IEEE J. Quantum Electron., vol. 41, pp. 872-879, 2005.
32.	B. C. Roy and P. K. Das	State Space Modeling of Quantum Feedback Control System in Interacting Fock Space To appear in Intl. J. Control

ANNEXURE – VI(B)
Research Publications in Seminars/ Symposia/ Conferences

	P. K. Basu	Quantum well Photonic Devices Using Si and Its Alloys: Some Theoretical Investigations, Invited paper (Abstract only) in Intl. Conf. MEMS and Semiconductor Nanotechnology (MEMSNANO), organized by IIT-Kharagpur, Dec. 20-22, p. 75.
	P. K. Basu	Electrons, Phonons, Photons and Their Interactions in Si Based Devices , Proc. Intl. Conf. Electronic and Photoic Materials, Devices and Systems (EPMDS 06) eds. Sudakshina Kundu and Anupam Karmakar, U Calcutta Press, 2006, pp. A 84 – A 88.
	Abhijit Biswas and P. K. Basu	Design Issues of an Optimum Low Noise Amplifier Based on SiGe HBTs : Its Modelling, and Simulation Using PSpice, Proc. EPMDS 2006, pp. I 18 – I 19.
	S. Chattopadhyay, J. Y. Siddiqui and D. Guha	Accurate CAD Formulation for Rectangular Microstrip Patch Antennas, IEEE Antennas and Propagations Symp,Washington DC, July 2005.
	D Guha and Y. M. M. Antar,	Half Hemispherical DRA Array for Very Large Bandwidth High Gain and Monopole-Like Radiation Pattern IEEE Antennas and Propagations Symp, Washington DC, July 2005.
	D. Guha and Y. M. M. Antar	Novel Wide-Band Half Hemispherical Dielectric Resonator Antenna 11th International Symposium on Antenna Technology and Apply Electromagnetics (ANTEM 2005), Saint-Malo France, June, 2005.
	M. Biswas and D. Guha	Broadband Inverted Microstrip Patches for Mobile Communication Systems Proc. XXVIIIth URSI General Assembly, New Delhi, Oct. 2005.
	M. Biswas, J. Y. Siddiqui and D. Guha	Computer-aided design of triangular microstrip patch antenna in multi-layered media Proc. XXVIIIth URSI General Assembly, Delhi, Oct. 2005.
	S. Biswas, M. Biswas, D. Guha, Y. M. M. Antar	New Defected Ground Structure For Microstrip Circuit And Antenna Applications Proc. XXVIIIth URSI General Assembly, Delhi, Oct. 2005.
10. 11. 12.	D. Guha, and Y. M. M. Antar D. Guha, Y.M.M.Antar D. Guha, Y.M.M.Antar	Four-Element Cylindrical Dielectric Resonator Array: Broadband Low Profile Antenna For Mobile Communications Proc. XXVIIIth URSI General Assembly, Delhi, Oct. 2005. Physical Insight Into the Ultra Wideband Performance of the Monopole-Dielectric Resonator Antenna in European Conference on Antennas and Propagations, Nice, Nov. 2006. Composite and Hybrid Dielectric Resonator Antennas: Recent Advances and Challenges (Invited Paper) Nat. Radio Science Meeting, Cairo, March, 2006.
13.	N.N.Purkait, Sanghamitra De, U.Sarkar and A.Dey	Measurement of total ozone and related parameters by MICROTOPS II Sun-photometer Post Land Campaign II and Working-Group II Conference, Physical Research Laboratory, Ahmedabad, 1-3 March, 2005.
14.	N.N.Purkait, Sanghamitra De and A.Hazra,	Effective UV Irradiance and Total Columnar Ozone: A Case Study using data from TOMS and MICROTOPS II Sun Photometer Second Asia Oceania Geoscience Conference, Singapur, June 20-24, 2005.
15.	Sanghamitra De, Susanta Sen, D.K.Chakraborty N.N.Purkait	Measurement of Total Columnar Ozone at Kolkata using Ground and Satellite Based Instrument National Space Science Symposium – 2006, Department of Physics, Andhra University, Visakhapatnam, 9-12 February 2006.
16.	Sanghamitra De, Susanta Sen, D.K.Chakraborty N.N.Purkait,	Surface Ozone Scenario at and around Kolkata National Space Science Symposium – 2006, Department of Physics, Andhra University, Visakhapatnam, 9-12 February 2006.
17.	Mukul K Das and N. R. Das	Performance Analysis of a Vertical SiGe p-i-n Photodetector for Different Ge-composition, Proceedings of the International conference on Electronic and Photonic Materials, Devices and Systems (EPMDS), Jan.4-7, 2006, Kolkata, India.
18.	Himadri Dutta and N. R. Das	On the Responsivity of a Si-based Resonannt Cavity Enhanced Schottky Photodetector, Proceedings of the International conference on Electronic and Photonic Materials, Devices and Systems (EPMDS), Jan.4-7, 2006, Kolkata, India.
19.	Mukul K Das, N. R. Das and P. K. Basu	Performance Analysis of a SiGe/Si Heterojunction Bipolar Transistor for Different Ge-composition, Proceedings of the General Assembly of the International Union of Radio Science (URSI), Oct. 23-28, 2005, New Delhi, India.
20.	N. R. Das, Alokananda Mitra and Amit Maji	A New Approach to the Modeling of an IC Inductor, Proceedings of the General Assembly of the International Union of Radio Science (URSI), Oct. 23-28, 2005, New Delhi, India.
21.	N. R. Das and M. J. Deen	Modeling of High Bit-rate Photodetectors and Photoreceivers for Optical Communications, Invited Poster Presentation First Workshop on Ontario Photonics Consortium (OPC), CANADA, June 2005, McMaster University, Canada.
22.	N. R. Das and M. J. Deen	Invited Paper, , Quantum Dot Infrared Photodetector and its Applications, (ABSTRACT ONLY) International Workshop on The Physics of Semiconductor Devices, IWPSD-2005, December 13-17, 2005, New Delhi, India.
23.	J. B. Roy and P. K. Basu	Refractive Index of Zn Cd Se Te Near the Fundamental Absorption Edge, Proc. EPMDS, 2006, pp. B 16 – B 17.
24.	N. R. Das and Susmita Sen	Electron-states in a Quantum Ring of a wide-gap semiconductor in the presence of an
25.	S. S. De, B. K. De, S. K. Adhikari, B. K. Sarkar, A. Guha, P. Das and P. K. Mandal	On the generation of perturbation in the lower ionosphere due to seismo-electromagnetic effect during earthquake URSI GA 2005
26	S. S. De, S. K. Adhikari, B. K. Sarkar, P. K. Mandal, A. Guha and P. Das	Electric field modeling for the lower atmosphere due to cloud charge distribution URSI GA 2005
27.	S. S. De, P. K. Mandal, S. K. Adhikari, B. K. Sarkar, P. Das and A. Guha	Space-time variation of raindrop size distribution URSI GA 2005
28.	S. S. De, A K Ghosh and T K Ghosh	Studies on heat generation processes in heavily doped semiconductor devices URSI GA 2005
29.	S.S. De B. K. De, S. K. Adhikari, B. K. Sarkar, S. K. Sarkar, A. Guha, P. K. Mandal, S. K. Mandal, H. P. Sardar, M. Ray	The effect of recent Venus transit on atmospheric vertical potential gradient and ELF-VLF propagation URSI GA 2005
30.	S. S. De, B. K. De, A. Guha and P. K. Mandal	Detection of 2004 Leonid meteor shower from Kolkata through its effects on VLF transmission URSI GA 2005
31.	A. Guha, S. S. De, A. Guha, B. K. De and P. K. Mandal	A correlation study of VLF Sferics with atmospheric vertical electric field at Kolkata along with its deviation from global character URSI GA 2005
32.	B. K. De, S. S. De and M. Pal	Exploration of Atmospheric Radio Noise Field Strength (ARNFS) at Tripura at various Frequencies : URSI GA 2005
33.	S. S. De, B. K. De, A. Guha, P. Das and A. Ghosal	A detailed Study on Some Specific Features of the Atmospheric Vertical Electric Potential Gradient and VLF Sferics in Kolkata (22.34 N, 88.24 E) and Agartala (23.5 N, 91.25 E) XIV National Space Science Symposium-NSSS 2006”, sponsored by ISRO, during 9-12^th February 2006, held at Department of Physics, Andhra University, Visakhapatnam:
34.	B. K. De, A. Bhowmik, S. S. De, A. Guha and S. K. Adhikari	The Effect of Earthquakes on Atmospherics at 6 and 9 kHz Observed at Tripura NSSS 2006
35.	S. N. Paul, C. Das, I. Paul, B. K. Sarkar, B. Paul, S. S. De and G. Pakira	Double Layers in a Dusty Plasma Consisting of Non-Thermal Electrons NSSS 2006
36.	S. N. Paul, G. Pakira, B. Paul, S. K. Adhikari, I. Paul, S. S. De and C. Das	Ion-Acoustic Solitons in Multi-Component Plasma of the Ionosphere NSSS 2006
37.	D. Guha S. Biswas, M. Biswas , Y. M. M. Antar	New defected ground plane structure for microstrip circuit and antenna applications URSI GA 2005
38.	D. Guha, M. Biswas	Broadband inverted microstrip patches for mobile communication systems URSI GA 2005
39.	D. Guha, M. Biswas, J. Siddiqui	Computer aided design of triangular microstrip patch antenna in multilayered media URSI GA 2005
40.	D. Guha, Y. M. M. Antar	Four-element cylindrical dielectric resonator array : Broadband low profile antenna for mobile communications : URSI GA 2005
41.	P. K. Saha andPriyanka Mondal	Mode spectra of coaxial waveguides with multiple polar ridges URSI GA 2005
42.	J.P.Banerjee, K.P.Ghata, S.Ghosh and D.De	Influence of Quantum Confinement on the Einstein Relation in heavily doped non linear Optical & Optoelectronic material-, IWPS, 2005, Vol I, Page-535.
43	J.P.Banerjee, K.P.Ghatak,S.Ghosh and D.De	On the thermoelectric Power in Quantum Dot Superlattice of Nonparabolic Semiconductor with graded interfaces IWPSD, 2005, Vol I, Page-435.
44.	A.Das Gupta, A. Paul, S. Ray, A. Das and S. Ananthakrishnan	Equatorial Bubbles as observed with GPS measurements, Ionospheric Effects Symposium – 2005 (IES2005), May 3-5, 2005, Alexandria, Virginia, USA
45.	S. Ray, A. Paul and A. DasGupta,	Equatorial Scintillations in Relation to the development of Ionization Anomaly 11^th International Symposium on Equatorial Aeronomy and CAWSES Mini-Workshop (ISEA-11), May 9-14, 2005, Taipei, Taiwan, R.O.C.
46.	A.Paul, S. Ray, K. Basu and A. DasGupta	Estimation of L-band Scintillation Intensity from VHF Scintillation Characteristics 11^th International Symposium on Equatorial Aeronomy and CAWSES Mini-Workshop (ISEA-11), May 9-14, 2005, Taipei, Taiwan, R.O.C.
47.	A.DasGupta, A. Paul, S. Ray, A. Das and S. Ananthakrishnan	Observations of Equatorial Spread-F (ESF) using the Giant Meterwave Radio Telescope (GMRT), Global Positioning System (GPS) and Geostationary satellites XXVIII^th General Assembly of the International Union of Radio Science (URSI-GA 2005), October 23-29, 2005, New Delhi, India.
48.	S. Ray, A. DasGupta and P. Banerjee	Northern Limit of the Equatorial Irregularity Belt observed with GPS signal scintillations XXVIII^th General Assembly of the International Union of Radio Science (URSI-GA 2005), October 23-29, 2005, New Delhi, India
49.	A. DasGupta, A. Das, D. Hui, K. K. Bandyppadhyay and M. R. Sivaraman	Ionospheric Perturbations Observed By The GPS Following The December 26^th, 2004 Sumatra-Andaman Earthquake 42^nd Annual Convention and Meeting on “Earth System Process Related to Earthquakes, Tsunamis and Volcanic Eruptions”, December 7-9, 2005, Barkatullah University, Bhopal, India.
50.	A. Das, A. Paul and A. DasGupta	Slant and Vertical Total Electron Content as Observed from GAGAN Stations XIV^th National Space Science Symposium (NSSS-2006), February 9-12, 2006, Andhra University, Visakhapatnam, India.
51.	S. K. Chakraborty, A.Paul, A. Das and D. Hui	Ionosphere near the anomaly crest in the Indian Zone during the magnetic storm on March 13, 1989 XIV^th National Space Science Symposium (NSSS-2006), February 9-12, 2006, Andhra University, Visakhapatnam, India.
52.	A. DasGupta,	Long-term Control of Solar Activity on Equatorial Scintillations, International Living With a Star (ILWS) Workshop on “ The Solar Influence on the Heliosphere and Earth’s Environment: Recent Progress and Prospects”, February 19-24, 2006, Goa, India.
53.	A. Maitra and K. Chakravarty	Ku-Band Rain Attenuation Observations on an Earth-Space Path in the Indian Region URSI General Assembly, New Delhi, 23-29 October 2005, orally presented,  published in the proceedings (4 pages) [Paper No F01.4(0650)].
54.	A. Maitra and K.Chakravarty	Raindrop Size Distribution Measurements and Associated Rain Parameters at a Tropical Location in the Indian Region”,  URSI, GA 2005,  orally presented, published in the proceedings (4 pages) [Paper No F01.6(01059)].
55.	A. Maitra, K.Chakravarty, C. Shome and G. Bandyopadhyay	Refractivity Profiles and Associated Atmospheric Monitoring from GPS Occultations and Radiosonde Observations in the Indian Region”,  URSI GA 2005, orally presented, published in the proceedings (4 pages) [Paper No FG.3(0431)].
56.	A. Maitra	Studies of climatic parameters with propagation measurements and radiosonde data in the Indian region Abstracts 3^rd Indo-French Workshop on Megha Tropiques”, Satellite Application Centre, Ahmedabad, October 17-20, 2005, p.57.
57.	A.Maitra, A. Bhattacharjee, K. Chakravarty and T. Rakshit Ghosh	Studies on cloud liquid water content at a tropical location Abstracts XIV National Space Science Symposium, Visakhapatnam, Februsry 9-12, 2006, p. 32.
58.	A.Maitra and T. Rakshit Ghosh	Modelling of weighted mean temperature for retrieval of atmospheric water vapour using GPS in the Indian region Abstracts XIV National Space Science Symposium, Visakhapatnam, Februsry 9-12, 2006, p. 32.
59.	A. Maitra and K. Chakravarty	Propagation studies over an earth-space path at Ku-band in the Indian region Abstracts XIV National Space Science Symposium, Visakhapatnam, Februsry 9-12, 2006, p. 33
60.	B.C. Roy and P. K. Das	Optical Cavity QED Feedback Control System and Nyquist Stability Analysis, Proc. EPMDS, pp. H 28 –29 , 2006.
61.	B.C. Roy	Stability Analysis of Quantum Mechanical Feedback Control System, Accepted in Worls Sc. Conf. Proc. 2006.

ANNEXURE – VI(C)