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% Selection : Author: H-D_Hristov
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@Article{hristov_etal:2006,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Urumov, J.R. and Feick, R},
      TITLE = {Reply to Comments on 'Focusing Characteristics of Curvilinear Half-Open Fresnel Zone Plate Lenses: Plane Wave Illumination'},
      YEAR = {2006},
      MONTH = {September},
      JOURNAL = {IEEE Transactions on Antennas and Propagation},
      VOLUME = {54},
      NUMBER = {9},
      PAGES = {2692-2693},
      URL = {http://dx.doi.org/10.1109/TAP.2006.880790},
      NOTE = {ISI}
}

@Article{hristov_etal:2005,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Urumov, J.R. and Feick, R},
      TITLE = {Focusing Characteristics of Curvilinear Half-Open Fresnel Zone Plate Lenses: Plane Wave Illumination},
      YEAR = {2005},
      MONTH = {June},
      JOURNAL = {IEEE Transactions on Antenna and Propagation},
      VOLUME = {53},
      NUMBER = {6},
      PAGES = {1912-1919},
      URL = {http://dx.doi.org/10.1109/TAP.2005.848499},
      NOTE = {ISI}
}

@Article{kamburov_etal:2005,
      AUTHOR = {Kamburov, L.P. and Hristov, H.D. and Urumov, J.R. and Feick, R},
      TITLE = {Corvilinear Fresnel-Zone Plate Lens Antena: Radiation Theory},
      YEAR = {2005},
      MONTH = {November},
      JOURNAL = {International Journal of Infrared and Milimeter Waves},
      VOLUME = {26},
      NUMBER = {11},
      PAGES = {1593-1611},
      NOTE = {ISI}
}

@Article{kamburov:2004,
      AUTHOR = {Kamburov, L.P. and Hristov, H.D. and Feick, R},
      TITLE = {Optimum Design of Millimeter-Wave Double-Dielectric Fresnel Zone-Plate Lens and Antenna},
      YEAR = {2004},
      MONTH = {February},
      JOURNAL = {International Journal of Infrared and Millimeter Waves},
      PAGES = {301-316},
      NOTE = {ISI}
}

@Article{hristov_etal:2004,
      AUTHOR = {Hristov, H.D. and Feick, R and Grote, W. and Fern{\~A}ˇndez, P.},
      TITLE = {Indoor Signal Focusing by Means of Fresnel Zone Plate Lens Attached to Building Wall},
      YEAR = {2004},
      MONTH = {April},
      JOURNAL = {IEEE Transactions on Antennas and Propagation},
      VOLUME = {52},
      NUMBER = {4},
      PAGES = {933-940},
      NOTE = {ISI}
}

@Article{carrasco_etal:2004,
      AUTHOR = {Carrasco, H and Hristov, H.D. and Feick, R and Cofr{\~A}©, D.},
      TITLE = {Mutual Coupling between Planar Inverted-F Antennas},
      YEAR = {2004},
      MONTH = {August},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {42},
      NUMBER = {3},
      PAGES = {224-227},
      NOTE = {ISI}
}

@Article{feick_etal:2004,
      AUTHOR = {Feick, R and Carrasco, H and Olmos, M. and Hristov, H.D.},
      TITLE = {PIFA input bandwidth enhancement by changing of feed plate silhouette},
      YEAR = {2004},
      MONTH = {July},
      JOURNAL = {Electronics Letters},
      VOLUME = {40},
      NUMBER = {15},
      PAGES = {921-922},
      NOTE = {ISI}
}

@Article{pena_etal:2003,
      AUTHOR = {Pe{\~A}±a, D. and Hristov, H.D. and Feick, R and Grote, W.},
      TITLE = {Measurement and Modeling of Propagation Losses in Brick and Concrete Walls for the 900-MHz Band},
      YEAR = {2003},
      MONTH = {January},
      JOURNAL = {IEEE Transactions on Antenas and Propagation},
      VOLUME = {51},
      NUMBER = {1},
      PAGES = {31-39},
      NOTE = {ISI}
}

@Article{hristov_etal:2003,
      AUTHOR = {Hristov, H.D. and Feick, R and Grote, W. and Fern{\~A}ˇndez, P.},
      TITLE = {Indoor signal focusing by use of Fresnel zone plate},
      YEAR = {2003},
      MONTH = {January},
      JOURNAL = {Electronics Letters},
      VOLUME = {39},
      NUMBER = {1},
      PAGES = {67-68},
      NOTE = {ISI}
}

@Article{olmos_etal:2002,
      AUTHOR = {Olmos, M. and Hristov, H.D. and Feick, R},
      TITLE = {Inverted-F antennas with wideband match performance},
      YEAR = {2002},
      JOURNAL = {Electronics Letters},
      VOLUME = {38},
      NUMBER = {16},
      PAGES = {845-847},
      NOTE = {ISI}
}

@Book{hristov:2000,
      AUTHOR = {Hristov, H.D.},
      TITLE = {Fresnel Zones in Wireless Links, Zone Plate Lenses and Antennas},
      YEAR = {2000},
      PUBLISHER = {Artech House}
}

@InProceedings{hristov_etal:2006:b,
      AUTHOR = {Hristov, H.D. and Urumov, J.R. and Feick, R and Kirov, G.},
      TITLE = {Dual-band array of integrated short nackfire antennas},
      YEAR = {2006},
      MONTH = {16-19 July},
      BOOKTITLE = {ANTEM/URSI 2006 International Symposium},
      VOLUME = {1},
      PAGES = {543-546},
      ADDRESS = {Montreal, Canada}
}

@Article{hristov_etal:2007:a,
      AUTHOR = {Hristov, H.D. and Feick, R and Urumov, J.R. and Kirov, G.},
      TITLE = {Dual-band assembly of integrated short back-fire antennas: design and numerical study},
      YEAR = {2007},
      MONTH = {January},
      JOURNAL = {Microwave Journal},
      VOLUME = {50},
      NUMBER = {1},
      PAGES = {86-88},
      NOTE = {ISI}
}

@InProceedings{hristov_etal:2006:d,
      AUTHOR = {Ooi, B. L. and Hristov, H.D. and Zhang, Y. Q. and Fan, Y. J. and Gao, Y. and Zhao, G. and Lu, A. and Lu, H. J. and Leong, M. S.},
      TITLE = {Development of conformal plane-conical binary Fresnel zone plate antenna for millimeter waves},
      YEAR = {2006},
      MONTH = {30 October - 1 November},
      BOOKTITLE = {10 th IEEE Int. Conference on Communication Systems (IEEE ICCS)},
      ADDRESS = {Singapore}
}

@Article{hristov_etal:2007:b,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Urumov, J.R. and Feick, R and Atanassov, A.I. and Grote, W.},
      TITLE = {Conical double-dielectric Fresnel-zone lens and antenna},
      YEAR = {2007},
      MONTH = {May},
      JOURNAL = {IEEE Microwave and Wireless Components Letters},
      VOLUME = {17},
      NUMBER = {5},
      PAGES = {325-327},
      NOTE = {ISI}
}

@Article{carrasco_etal:MwOTL:2007,
      AUTHOR = {Carrasco, H and Feick, R and Hristov, H.D.},
      TITLE = {Experimental Evaluation of Indoor MIMO Channel Capacity for Compact Arrays of Planar Inverted-F Antennas},
      YEAR = {2007},
      MONTH = {July},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {49},
      NUMBER = {7},
      PAGES = {1754-1756},
      NOTE = {ISI}
}

@InProceedings{Urumov_Kamburov_Hristov:2005/meemi,
      AUTHOR = {Urumov, J.R. and Kamburov, L.P. and Hristov, H.D.},
      TITLE = {Panel Conformal Fresnel Lenses},
      YEAR = {2005},
      MONTH = {7-9 October},
      VOLUME = {1},
      PAGES = {253-257},
      PUBLISHER = {2nd International Scientific Congress on Mechanical, Electrical and Marine Industry, MEEMI 2005, Varna, Bulgaria}
}

@Article{hristov_etal:JAE-05,
      AUTHOR = {Kirov, G. and Kamburov, L.P. and Hristov, H.D.},
      TITLE = {Feed line losses in microstrip antenna arrays},
      YEAR = {2005},
      JOURNAL = {Journal of Applied Electromagnetics},
      KEY = {ISSN 1109-1606},
      VOLUME = {7},
      NUMBER = {1},
      PAGES = {1-8},
      CROSSREF = {Athens, Greece},
      NOTE = {ISI}
}

@Article{hristov_etal:IJIM/b,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Feick, R and Urumov, J.R.},
      TITLE = {Compound fresnel zone lens conformal to truncated cone: Antenna application},
      YEAR = {2007},
      MONTH = {June},
      JOURNAL = {International Journal of Infrared and Millimeter},
      VOLUME = {28},
      NUMBER = {6},
      PAGES = {451-464},
      NOTE = {ISI}
}

@InProceedings{hristov_etal:EWCA05,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Feick, R},
      TITLE = {Microwave Antenna with Compound Fresnel Zone-Plate Lens Conformal to Truncated Conical Dome},
      YEAR = {2005},
      MONTH = {23-24 May},
      PAGES = {113-116},
      PUBLISHER = {4th European Workshop on Conformal Antennas (EWCA'05), Stockholm, Sweden}
}

@Article{carrasco:08:microwave op,
      AUTHOR = {Hristov, H.D. and Carrasco, H and Feick, R},
      TITLE = {Bent Inverted-F Antenna for Wlan Units},
      YEAR = {2008},
      MONTH = {June},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {50},
      NUMBER = {6},
      PAGES = {1505-1509},
      NOTE = {ISI}
}

@Article{hristov:1977,
      AUTHOR = {Kumar, A. and Hristov, H.D.},
      TITLE = {Modified backfire antenna lowers cross-polarization},
      YEAR = {1977},
      JOURNAL = {Microwaves},
      VOLUME = {16},
      PAGES = {70-73},
      ADDRESS = {Horizon House, USA}
}

@Article{hristov_etal:Transac_08,
      AUTHOR = {Ooi, B. L. and Fan, Y. J. and Hristov, H.D. and Feick, R and Shan, X.  and Lu, A.},
      TITLE = {A Hybrid Fast Multipole Pseudo-Spectral Time Domain Method},
      YEAR = {2008},
      MONTH = {May},
      JOURNAL = {IEEE Transactions on Antennas and Propagation},
      VOLUME = {56},
      NUMBER = {5},
      PAGES = {1394-1401},
      NOTE = {ISI}
}

@InProceedings{feick_etal:CN:2000,
      AUTHOR = {Feick, R and Grote, W. and Hristov, H.D.},
      TITLE = {Criterios y Procedimientos para mediciones de propagaci{\~A}łn electromagnetica en ambientes confinados.},
      YEAR = {2000},
      MONTH = {November},
      BOOKTITLE = {IX Congreso Internacional de Telecomunicaciones Senacitel 2000},
      ADDRESS = {Valdivia, Chile},
      NOTE = {CN}
}

@InProceedings{kamburov_etal:2001,
      AUTHOR = {Kamburov, L.P. and Urumov, J.R. and Hristov, H.D.},
      TITLE = {Measurement Method for Fresnel Antennas with Curved Axially-Symmetric Surface},
      YEAR = {2001},
      MONTH = {10-11 May},
      BOOKTITLE = {11th Int. Conference Radioelektronika-2001},
      VOLUME = {2},
      PAGES = {421-424},
      ADDRESS = {Brno, Czech Republic}
}

@InProceedings{hristov_etal:2001,
      AUTHOR = {Hristov, H.D. and Feick, R and Grote, W.},
      TITLE = {Improving Indoor Signal Coverage by Use of Through-Wall Passive Repeaters},
      YEAR = {2001},
      BOOKTITLE = {IEEE Antannas {\&} Propagation Int. Symposium, Symp., Digest},
      VOLUME = {2},
      PAGES = {158-161},
      ADDRESS = {Boston}
}

@InProceedings{feick_etal:2001,
      AUTHOR = {Feick, R and Hristov, H.D. and Pe{\~A}±a, D. and Grote, W.},
      TITLE = {Prediction of Through Wall Attenuation in the 900 MHz Band},
      YEAR = {2001},
      MONTH = {27-29 June},
      BOOKTITLE = { Proceedings of the IASTED International Conference Wireless and Optical Communications},
      PAGES = {70-74},
      ADDRESS = { Banff Canada}
}

@InProceedings{hristov_etal:2001:a,
      AUTHOR = {Hristov, H.D. and Feick, R},
      TITLE = {The Dome-Like Fresnel-Zone Antennas (or How to Convert a Dome into Antenna)},
      YEAR = {2001},
      BOOKTITLE = {USNC/URSI, Nat. Radio Science, Meeting, URSI Digest},
      PAGES = {46},
      ADDRESS = { Boston}
}

@InProceedings{feick_etal:2002,
      AUTHOR = {Feick, R and Hristov, H.D. and Grote, W.},
      TITLE = {Attenuation Measurements for Double-Mesh Reinforced Concrete Walls at the 900-MHz Cellular Band},
      YEAR = {2002},
      MONTH = {May},
      BOOKTITLE = { Int. Wireless Design Conference (WDC)},
      PAGES = {165-168},
      ADDRESS = {London, U.K}
}

@InProceedings{feick_etal:2002:a,
      AUTHOR = {Feick, R and Torres, D and Hristov, H.D. and Grote, W.},
      TITLE = {Passive Repeater for Mobile Signal Coverage of Lossy Wall Building Rooms},
      YEAR = {2002},
      MONTH = {May},
      BOOKTITLE = { Int. Wireless Design Conference (WDC)},
      PAGES = {173-176},
      ADDRESS = { London, U.K}
}

@InProceedings{feick_etal:2002:b,
      AUTHOR = {Feick, R and Villanueva, S and Hristov, H.D. and Grote, W.},
      TITLE = {3-D Source Position Determination Using Vector Correlation in a Ring Array},
      YEAR = {2002},
      MONTH = {July},
      BOOKTITLE = {IASTED Wireless and Optical Communications Conference},
      VOLUME = {1},
      PAGES = { 21-26},
      ADDRESS = {Banff, Canad{\~A}ˇ}
}

@InProceedings{olmos_etal:2002:a,
      AUTHOR = {Olmos, M. and Hristov, H.D. and Feick, R and Grote, W.},
      TITLE = {Development of Planar Inverted-F antennas with Increased Input Bandwidth},
      YEAR = {2002},
      MONTH = {September},
      BOOKTITLE = {XII Simposium Nacional de la Uni{\~A}łn Cient{\~A}­fica Internacional de Radio (URSI)},
      PAGES = {627-628},
      ADDRESS = {Alcal{\~A}ˇ de Henares (Madrid)}
}

@InProceedings{hristov_etal:2002,
      AUTHOR = {Hristov, H.D. and Kamburov, L.P. and Urumov, J.R.},
      TITLE = {Comparison on Focusing Characteristics of Curvilinear Fresnel Zone Plates},
      YEAR = {2002},
      MONTH = {September},
      BOOKTITLE = {XII Simposium Nacional de la Uni{\~A}łn Cient{\~A}­fica Internacional de Radio (URSI)},
      PAGES = {469-470},
      ADDRESS = {Alcal{\~A}ˇ de Henares (Madrid)}
}

@InProceedings{Fan_Hristov-Feick:EUCAP07,
      AUTHOR = {Fan, Y. J. and Ooi, B. L. and Leong, M. S. and Shan, X.  and Lu, A. and Hristov, H.D. and Feick, R},
      TITLE = {PSTD-FDTD Analysis for Complex Irregular Fresnel Zone Plates},
      YEAR = {2007},
      MONTH = {11-16 November},
      BOOKTITLE = {2nd EUCAP 2007},
      PAGES = {WePa035},
      ADDRESS = {Edinburgh, UK}
}

@InProceedings{Ooi-Hristov-Feick:PIERS2008,
      AUTHOR = {Ooi, B. L. and Leong, M. S. and Hristov, H.D. and Feick, R and Ang, I.},
      TITLE = {An Efficient Algorithm Macrobasis-function and Progressive Method for Analyzing Microwave Filter (Invited paper)},
      YEAR = {2008},
      MONTH = {24-28 March},
      BOOKTITLE = {Progress in Electromagnetics Research Symposium, PIERS 2008},
      ADDRESS = {Hangzhou, China}
}

@InProceedings{Ooi-Hristov-Feick:AEMC07,
      AUTHOR = {Ooi, B. L. and Leong, M. S. and Hristov, H.D. and Feick, R and Ang, I. and Sing, C-H.},
      TITLE = {An Efficient Algorithm for Analyzing Large Microstrip Structure using Macro-Baseis-Function and Progressive Method (Invited paper)},
      YEAR = {2007},
      MONTH = {19-20 December},
      BOOKTITLE = {IEEE Applied Electromagnetics Conference (AEMC 2007)},
      ADDRESS = {Kolkata, India}
}

@Article{Ooi-Hristov-Feick:MOTL.08,
      AUTHOR = {Ooi, B. L. and Ang, I. and Shan, X.  and Lu, A. and Feick, R and Hristov, H.D.},
      TITLE = {Wide-Slot Waveguide Antenna on LTCC Technology},
      YEAR = {2008},
      MONTH = {August},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {5},
      NUMBER = {8},
      PAGES = {2181-2184},
      NOTE = {ISI}
}

@Article{hh_rf:MOTL-02,
      AUTHOR = {Ooi, B. L. and Leong, M. S. and Shong, Z. and Wang, Y. and Hui, S. C. and Hristov, H.D. and Feick, R},
      TITLE = {An EBG Spatial Power Combiner},
      YEAR = {2008},
      MONTH = {June},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {50},
      NUMBER = {5},
      PAGES = {1534-1536},
      NOTE = {ISI}
}

@Article{hristov-feick:mj/08,
      AUTHOR = {Hristov, H.D. and Grote, W. and Feick, R},
      TITLE = {Antenna Passive Repeaters for Indoor Recovery of Microwave Cellular Signals},
      YEAR = {2008},
      MONTH = {September},
      JOURNAL = {Microwave Journal},
      VOLUME = {51},
      NUMBER = {9},
      NOTE = {ISI}
}

@Article{HH/HCE/RFL/2009:motl,
      AUTHOR = {Hristov, H.D. and Carrasco, H and Feick, R},
      TITLE = {Low-Profile X Antenna with Flat Reflector for Polarization Diversity Application},
      YEAR = {2009},
      MONTH = {June},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {51},
      NUMBER = {6},
      PAGES = {1508-1512},
      NOTE = {ISI}
}

@Article{Kirov/Hristov/Feick:2009MJ,
      AUTHOR = {Kirov, G. and Hristov, H.D. and Feick, R},
      TITLE = {Backfire Disk-on-rod Antenna for Long-range Point-to-point Communications},
      YEAR = {2009},
      MONTH = {June},
      JOURNAL = {Microwave Journal},
      VOLUME = {52},
      NUMBER = {6},
      PAGES = {64},
      NOTE = {ISI}
}

@Article{Hristov:2009:JAE,
      AUTHOR = {Hristov, H.D. and Leong, M. S. and Kirov, G. and Grote, W.},
      TITLE = {Waveguide-fed Backfire Antennas for Low-terahertz Frequencies},
      YEAR = {2009},
      MONTH = {December},
      JOURNAL = {JAE-Journal of Applied Electromagnetism},
      VOLUME = {11},
      NUMBER = {2},
      PAGES = {34-44}
}

@Article{Hristov:IEEEAP/10,
      AUTHOR = {Fan, Y. J. and Ooi, B. L. and Hristov, H.D. and Leong, M. S.},
      TITLE = {Compound diffractive lens consisting of Fresnel Zone Plate and Frequency Selective Screen},
      YEAR = {2010},
      MONTH = {June},
      JOURNAL = {IEEE Transactions Antennas and Propagation},
      VOLUME = {58},
      NUMBER = {6},
      PAGES = {1842-1847},
      NOTE = {ISI}
}

@Article{Hristov:MOTL/2010,
      AUTHOR = {Hristov, H.D. and Carrasco, H and Feick, R and Kirov, G.},
      TITLE = {Broadband two port X antenna array with flat reflector for polarization diversity actions},
      YEAR = {2010},
      MONTH = {December},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {52},
      NUMBER = {12},
      PAGES = {2833-2837},
      NOTE = {ISI}
}

@InProceedings{Hristov:IAST/2010,
      AUTHOR = {Hristov, H.D.},
      TITLE = {Microwave Fresnel Zone Plate Antenna Runs at Multiple Terahertz Frequencies},
      YEAR = {2010},
      MONTH = {1-3 November},
      BOOKTITLE = {The International Association of Science and Technology for Development},
      ADDRESS = {Massachusetts, USA}
}

@Article{HH/Kirov,
      AUTHOR = {Kirov, G. and Hristov, H.D.},
      TITLE = {Study of backfire antennas},
      YEAR = {2011},
      MONTH = {June},
      JOURNAL = {Journal of Microwaves, Optoelectronics and Electromagnetic Applications},
      VOLUME = {10},
      NUMBER = {1},
      PAGES = {1-12},
      URL = {http://www.jmoe.org/site-number?id=31}
}

@Article{HH: IJAP,
      AUTHOR = {Hristov, H.D.},
      TITLE = {Terahertz Harmonic Operation of Microwave Fresnel Zone Plate Lens and Antenna: Frequency Filtering and Space Resolution Propierties},
      YEAR = {2011},
      MONTH = {December},
      JOURNAL = {International Journal of Antennas and Propagation},
      VOLUME = {2011},
      PAGES = {8},
      URL = {http://www.hindawi.com/journals/ijap/2011/541734/},
      NOTE = {ISI}
}

@InProceedings{Hristov:2011:Eumoc,
      AUTHOR = {Rodr{\~A}­guez_(alumno), J.M. and Hristov, H.D. and Grote, W.},
      TITLE = {Fresnel Zone Plate and Ordinary Lens Antennas: Comparative Study at Microwave and Terahertz Frequencies},
      YEAR = {2011},
      MONTH = {9-14 October},
      BOOKTITLE = {European Microwaves Week},
      ADDRESS = {Manchester, England},
      URL = {http://ieeexplore.ieee.org//xpls/abs_all.jsp?arnumber=6101941}
}

@Article{Hristov_etal:Microwave:2012,
      AUTHOR = {Hristov, H.D. and Rodr{\~A}­guez_(alumno), J.M. and Grote, W.},
      TITLE = {The grooved-dielectric Fresnel zone plate: An effective terahertz lens and antenna},
      YEAR = {2012},
      MONTH = {June},
      JOURNAL = {Microwave and Optical Technology Letters},
      VOLUME = {54},
      NUMBER = {6},
      PAGES = {1343-1348},
      URL = {http://dx.doi.org/10.1002/mop.26812},
      NOTE = {ISI}
}

@Article{HristovRodriguez:IEEE:2012,
      AUTHOR = {Hristov, H.D. and Rodr{\~A}­guez_(alumno), J.M.},
      TITLE = {Design Equation for Multidielectric Fresnel Zone Plate Lens},
      YEAR = {2012},
      MONTH = {November},
      JOURNAL = {IEEE Microwave and Wireless Components Letters},
      VOLUME = {22},
      NUMBER = {11},
      PAGES = {574-576},
      URL = {http://dx.doi.org/10.1109/LMWC.2012.2224099},
      NOTE = {ISI}
}

@InProceedings{mjmr:ursi:2013:1,
      AUTHOR = {Rodr{\~A}­guez_(alumno), J.M. and Carrasco, H and Hristov, H.D.},
      TITLE = {Subwavelength Resolution of Conical Fresnel Zone Lens},
      YEAR = {2013},
      MONTH = {7-13 July},
      BOOKTITLE = {APS/URSI Conference},
      ADDRESS = {Orlando, USA}
}

@InProceedings{mjmr:ursi:2013:2,
      AUTHOR = {Hristov, H.D. and Rodr{\~A}­guez_(alumno), J.M. and Kamburov, L.P. and Urumov, J.R.},
      TITLE = {Cone-Shape Fresnel Zone Lens of Flat Dielectric Rings ,},
      YEAR = {2013},
      MONTH = {7-13 July},
      BOOKTITLE = {APS/URSI Conference},
      ADDRESS = {Orlando, USA}
}

@InProceedings{6632220,
      AUTHOR = {Hristov, H.D. and Rodr{\~A}­guez_(alumno), J.M. and Urumov, J.R. and Kamburov, L.P.},
      TITLE = {Lens antenna based on fresnel zone lens of flat dielectric rings conformal to conical surface},
      YEAR = {2013},
      BOOKTITLE = {ICEAA 2013}
}

@Article{Haralambiev:IJAP:2014,
      AUTHOR = {Haralambiev, L.A. and Hristov, H.D.},
      TITLE = {Radiation Characteristics of 3D Resonant Cavity Antenna with Grid-Oscillator Integrated Inside},
      YEAR = {2014},
      MONTH = {16 January},
      JOURNAL = {International Journal of Antennas and Propagation},
      VOLUME = {2014},
      NUMBER = {ID 479189},
      URL = {http://dx.doi.org/10.1155/2014/479189},
      NOTE = {ISI}
}

@Article{JMRodriguez/Hristov:2014,
      AUTHOR = {Kamburov, L.P. and Rodr{\~A}­guez_(alumno), J.M. and Urumov, J.R. and Hristov, H.D.},
      TITLE = {Millimeter-Wave Conical Fresnel Zone Lens of Flat Dielectric Rings},
      YEAR = {2014},
      MONTH = {April},
      JOURNAL = {IEEE Transactions on Antennas and Propagation},
      VOLUME = {62},
      NUMBER = {4},
      PAGES = {2140-2148},
      URL = {http://dx.doi.org/10.1109/TAP.2014.2303165},
      NOTE = {ISI}
}

@InProceedings{ID5157,
      AUTHOR = {Hristov, H.D. and Carrasco, H and Perotoni, M..B. and Kirov, G. and Kamburov, L.P.},
      TITLE = {Double-band backfire antenna for low-terahertz frequencies},
      YEAR = {2012},
      MONTH = {8-14 July},
      BOOKTITLE = {Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation},
      ADDRESS = {Chicago, IL, USA},
      PUBLISHER = {IEEE},
      URL = {http://dx.doi.org/10.1109/APS.2012.6348446}
}