{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T05:14:12Z","timestamp":1781846052712,"version":"3.54.5"},"reference-count":59,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,7,19]],"date-time":"2022-07-19T00:00:00Z","timestamp":1658188800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>In this research work, a symmetrical four-capacitance loaded complementary circular split ring resonator is proposed, which uses an ultra-thin Zinc Selenide (ZnSe) substrate to realize a low-profile triple-band metamaterial (MTM) perfect absorber for application in the terahertz (THz) frequency range. The electromagnetic properties of the proposed structure were calculated and investigated using the Finite Integration Technique (FIT). The proposed structure exhibited three highly absorptive (nearly perfect) peaks at the resonance frequencies of 15.68 THz, 37.48 THz, and 39.55 THz. Furthermore, the absorber was found to be insensitive to the polarization and incident wave angles, due to its symmetrical design. The effects of the conductor type, substrate thickness, unit cell dimension, resonator gap, and substrate type on the reflection and absorption spectra were investigated. To validate the numerical results, the proposed design was analyzed using High-Frequency Simulation Software (HFSS) and Advanced Design System (ADS). The surface current, electric field, and magnetic field distributions at the three-resonance frequency were analyzed. It was concluded that the overall performance of the proposed MTM structure was superior compared to those reported in the literature. The proposed design could be a good candidate for application in stealth technology, imaging, and thermal energy harvesting.<\/jats:p>","DOI":"10.3390\/sym14071477","type":"journal-article","created":{"date-parts":[[2022,7,19]],"date-time":"2022-07-19T08:28:25Z","timestamp":1658219305000},"page":"1477","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["A Symmetrical Terahertz Triple-Band Metamaterial Absorber Using a Four-Capacitance Loaded Complementary Circular Split Ring Resonator and an Ultra-Thin ZnSe Substrate"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2808-2867","authenticated-orcid":false,"given":"Yadgar I.","family":"Abdulkarim","sequence":"first","affiliation":[{"name":"School of Computer Science and Engineering, Central South University, Changsha 410075, China"},{"name":"Medical Physics Department, College of Medicals & Applied Science, Charmo University, Sulaimania 46001, Iraq"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatih","family":"\u00d6zkan Alkurt","sequence":"additional","affiliation":[{"name":"Department of Electrical-Electronics Engineering, Iskenderun Technical University, Hatay 31200, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Halgurd N.","family":"Awl","sequence":"additional","affiliation":[{"name":"Department of Communication Engineering, Sulaimani Polytechnic University, Sulaimani 46001, Iraq"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3237-4392","authenticated-orcid":false,"given":"Olcay","family":"Alt\u0131nta\u015f","sequence":"additional","affiliation":[{"name":"Department of Electrical-Electronics Engineering, Iskenderun Technical University, Hatay 31200, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4563-9671","authenticated-orcid":false,"given":"Fahmi F.","family":"Muhammadsharif","sequence":"additional","affiliation":[{"name":"Department of Physics, Faculty of Science and Health, Koya University, Koya 44023, Iraq"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0878-7405","authenticated-orcid":false,"given":"Bhargav","family":"Appasani","sequence":"additional","affiliation":[{"name":"School of Electronics Engineering, KIIT University, Bhubaneswar 751024, Odisha, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5847-743X","authenticated-orcid":false,"given":"Mehmet","family":"Bak\u0131r","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering, Bozok University, Yozgat 66200, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0923-1959","authenticated-orcid":false,"given":"Muharrem","family":"Karaaslan","sequence":"additional","affiliation":[{"name":"Department of Electrical-Electronics Engineering, Iskenderun Technical University, Hatay 31200, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1790-2946","authenticated-orcid":false,"given":"Mohamed","family":"Taouzari","sequence":"additional","affiliation":[{"name":"Laboratory LISA, National School of Applied Sciences, Hassan 1st University, Berrechid 26100, Morocco"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8220-8424","authenticated-orcid":false,"given":"Jian","family":"Dong","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Central South University, Changsha 410075, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1235","DOI":"10.1007\/s11771-020-4363-5","article-title":"Tunable left-hand characteristics in multi-nested square-split-ring enabled metamaterials","volume":"27","author":"Abdulkarim","year":"2020","journal-title":"J. Cent. South Univ."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"571","DOI":"10.1364\/PRJ.5.000571","article-title":"Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators","volume":"5","author":"Wang","year":"2017","journal-title":"Photonics Res."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1007\/s00339-012-7113-1","article-title":"Multi-functional metamaterial sensor based on a broad-side coupled SRR topology with a multi-layer substrate","volume":"110","author":"Ekmekci","year":"2013","journal-title":"Appl. Phys. A"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Dhama, R., Yan, B., Palego, C., and Wang, Z. (2021). Super-Resolution Imaging by Dielectric Super lenses: TiO2 Metamaterial Superlens versus BaTiO3 Super lens. Photonics, 8.","DOI":"10.3390\/photonics8060222"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"16119","DOI":"10.1038\/s41598-018-33572-y","article-title":"Metamaterial super lenses operating at visible wavelength for imaging applications","volume":"8","author":"Haxha","year":"2018","journal-title":"Sci. Rep."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1800141","DOI":"10.1002\/adom.201800141","article-title":"Active control of resonant cloaking in a terahertz MEMS metamaterial","volume":"6","author":"Manjappa","year":"2018","journal-title":"Adv. Opt. Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"160","DOI":"10.1007\/s00339-018-1590-9","article-title":"A new metamaterial-based wideband rectangular invisibility cloak","volume":"124","author":"Islam","year":"2018","journal-title":"Appl. Phys. A"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1860","DOI":"10.1109\/TAP.2020.2968795","article-title":"Review of Metasurface Antennas for Computational Microwave Imaging","volume":"68","author":"Imani","year":"2020","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"8813951","DOI":"10.1155\/2020\/8813951","article-title":"A Low-Profile Antenna Based on Single-Layer Metasurface for Ku-Band Applications","volume":"2020","author":"Abdulkarim","year":"2020","journal-title":"Int. J. Antennas Propag."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"113102","DOI":"10.1117\/1.OE.57.11.113102","article-title":"Antenna-based microwave absorber for imaging in the frequencies of 1.8, 2.45, and 5.8 GHz","volume":"57","author":"Alkurt","year":"2018","journal-title":"Opt. Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"113593","DOI":"10.1016\/j.physe.2019.113593","article-title":"Metamaterial absorber sensor design by incorporating swastika shaped resonator to determination of the liquid chemicals depending on electrical characteristics","volume":"114","author":"Abdulkarim","year":"2019","journal-title":"Phys. E Low-Dimens. Syst. Nanostruct."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1007\/s13320-019-0573-6","article-title":"Right-Angle Shaped Elements as Dual-Band Metamaterial Absorber in Terahertz","volume":"10","author":"Daniel","year":"2019","journal-title":"Photonic Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"109712","DOI":"10.1016\/j.optmat.2020.109712","article-title":"Design and measurement of a narrow band metamaterial absorber in terahertz range","volume":"100","author":"Zhong","year":"2020","journal-title":"Opt. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1016\/j.optcom.2018.01.048","article-title":"Design of a five-band terahertz perfect metamaterial absorber using two resonators","volume":"415","author":"Meng","year":"2018","journal-title":"Opt. Commun."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"11878","DOI":"10.1007\/s10854-020-03742-8","article-title":"Graphene-based tunable multi-band metamaterial polarization-insensitive absorber for terahertz applications","volume":"31","author":"Jain","year":"2020","journal-title":"J. Mater. Sci. Mater. Electron."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1016\/j.carbon.2019.07.011","article-title":"Ali Shah A broad dual-band switchable graphene-based terahertz metamaterial absorber","volume":"153","author":"Qi","year":"2019","journal-title":"Carbon"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Abdulkarim, Y.I., Muhammadsharif, F.F., Bak\u0131r, M., Awl, H.N., Karaaslan, M., Deng, L., and Huang, S. (2021). Hypersensitized Metamaterials Based on a Corona-Shaped Resonator for Efficient Detection of Glucose. Appl. Sci., 11.","DOI":"10.3390\/app11010103"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"10291","DOI":"10.1016\/j.jmrt.2020.07.034","article-title":"Design and study of a metamaterial based sensor for the application of liquid chemicals detection","volume":"9","author":"Abdulkarim","year":"2020","journal-title":"J. Mater. Res. Technol."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Abdulkarim, Y.I., Deng, L., Karaaslan, M., Alt\u0131nta\u015f, O., Awl, H.N., Muhammadsharif, F.F., Liao, C., Unal, E., and Luo, H. (2020). Novel metamaterials-based hypersensitized liquid sensor integrating omega-shaped resonator with microstrip transmission line. Sensors, 20.","DOI":"10.3390\/s20030943"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"136655","DOI":"10.1016\/j.cplett.2019.136655","article-title":"Determination of the liquid chemicals depending on the electrical characteristics by using metamaterial absorber based sensor","volume":"732","author":"Abdulkarim","year":"2019","journal-title":"Chem. Phys. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"125411","DOI":"10.1016\/j.optcom.2020.125411","article-title":"High sensitivity refractive index and temperature sensor based on semiconductor metamaterial perfect absorber in the terahertz band","volume":"463","author":"Aslinezhad","year":"2020","journal-title":"Opt. Commun."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"674","DOI":"10.1016\/j.optmat.2019.01.002","article-title":"Design of a six-band terahertz metamaterial absorber for temperature sensing application","volume":"88","author":"Zou","year":"2019","journal-title":"Opt. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2050207","DOI":"10.1142\/S0217984920502073","article-title":"A thermally tunable terahertz three-dimensional perfect metamaterial absorber for temperature sensing application","volume":"34","author":"Zou","year":"2020","journal-title":"Mod. Phys. Lett. B"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1016\/j.infrared.2017.08.017","article-title":"Metamaterial absorber for frequency selective thermal radiation","volume":"88","author":"Xu","year":"2018","journal-title":"Infrared Phys. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1303","DOI":"10.1007\/s11468-019-00936-7","article-title":"Multi-Band Terahertz Absorber at 0.1\u20131 THz Frequency Based on Ultra-Thin Metamaterial","volume":"14","author":"He","year":"2019","journal-title":"Plasmonics"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1681","DOI":"10.1002\/mop.32211","article-title":"Development of a tunable terahertz absorber based on temperature control","volume":"62","author":"Jianjun","year":"2020","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"086101","DOI":"10.1063\/1.5025947","article-title":"Inverting the thermal radiative contrast of vanadium dioxide by metasurfaces based on localized gap-plasmons","volume":"3","author":"Ito","year":"2018","journal-title":"APL Photonics"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2671","DOI":"10.1021\/acsphotonics.9b00024","article-title":"Controlling thermal emission by parity-symmetric fano resonance of optical absorbers in metasurfaces","volume":"6","author":"Zhang","year":"2019","journal-title":"ACS Photonics"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"514","DOI":"10.1016\/j.jallcom.2016.06.143","article-title":"Dual-band high-frequency metamaterial absorber based on patch resonator for solar cell applications and its enhancement with graphene layers","volume":"687","author":"Ustunsoy","year":"2016","journal-title":"J. Alloys Compd."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1061","DOI":"10.1007\/s11468-020-01132-8","article-title":"Numerical analysis of single negative broadband metamaterial absorber based on tri thin layer material in visible spectrum for solar cell energy harvesting","volume":"15","author":"Hoque","year":"2020","journal-title":"Plasmonics"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1950056","DOI":"10.1142\/S0217979219500565","article-title":"Solar energy harvesting with ultra-broadband metamaterial absorber","volume":"33","author":"Bagmanci","year":"2019","journal-title":"Int. J. Mod. Phys. B"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"15995","DOI":"10.1364\/OE.26.015995","article-title":"Nano photonic control of thermal radiation for energy applications","volume":"26","author":"Li","year":"2018","journal-title":"Opt. Express"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3192","DOI":"10.1039\/C9TC05634C","article-title":"Self-adaptive radiative cooling and solar heating based on a compound metasurface","volume":"8","author":"Wang","year":"2020","journal-title":"J. Mater. Chem. C"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"2439","DOI":"10.1364\/OME.404169","article-title":"Epsilon-near-zero thin-film metamaterials for wideband near-perfect light absorption","volume":"10","author":"Smith","year":"2020","journal-title":"Opt. Mater. Express"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"110369","DOI":"10.1016\/j.optmat.2020.110369","article-title":"Broadband tunable terahertz metasurface absorber based on complementary-wheel-shaped graphene","volume":"109","author":"Cheng","year":"2020","journal-title":"Opt. Mater."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Chen, F., Cheng, Y., and Luo, H. (2020). A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene. Materials, 13.","DOI":"10.3390\/ma13040860"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"125265","DOI":"10.1016\/j.optcom.2020.125265","article-title":"Dual-band tunable terahertz perfect metamaterial absorber based on strontiumtitanate (STO) resonator structure","volume":"462","author":"Li","year":"2020","journal-title":"Opt. Commun."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"85154","DOI":"10.1109\/ACCESS.2020.2992700","article-title":"Study on temperature adjustable terahertz metamaterial absorber based on vanadium dioxide","volume":"8","author":"Zhang","year":"2020","journal-title":"IEEE Access"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"763","DOI":"10.1039\/C9NA00770A","article-title":"Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application","volume":"2","author":"Wang","year":"2020","journal-title":"Nanoscale Adv."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"5751","DOI":"10.1038\/s41598-019-42293-9","article-title":"Vanadium dioxide-assisted broadband tunable terahertz metamaterial absorber","volume":"9","author":"Liu","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Huang, M.L., Cheng, Y.Z., Cheng, Z.Z., Chen, H.R., Mao, X.S., and Gong, R.Z. (2018). Design of a broadband tunable terahertz metamaterial absorber based on complementary structural graphene. Materials, 11.","DOI":"10.3390\/ma11040540"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"32280","DOI":"10.1364\/OE.25.032280","article-title":"Triple-band tunable perfect terahertz metamaterial absorber with liquid crystal","volume":"25","author":"Wang","year":"2017","journal-title":"Opt. Express"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"3104","DOI":"10.1364\/OME.8.003104","article-title":"Dual and broadband terahertz metamaterial absorber based on a compact resonator structure","volume":"8","author":"Cheng","year":"2018","journal-title":"Opt. Mater. Express"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"102422","DOI":"10.1016\/j.rinp.2019.102422","article-title":"Dual-band switchable terahertz metamaterial absorber based on metal nanostructure","volume":"14","author":"Zhang","year":"2019","journal-title":"Results Phys."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Jain, P., Singh, A.K., Pandey, J.K., Bansal, S., Gupta, N., Singh, A.K., Kumar, S., and Sardana, N. (2018, January 16\u201317). Ultra-thin and Dual Band Metamaterial Absorber for Terahertz Applications. Proceedings of the 6th Edition of International Conference on Wireless Networks & Embedded Systems (WECON), Rajpura, India.","DOI":"10.1109\/WECON.2018.8782070"},{"key":"ref_46","first-page":"64","article-title":"Design of Narrow Discrete Distances of Dual-\/Triple-Band Terahertz Metamaterial Absorbers","volume":"16","author":"Wang","year":"2019","journal-title":"Nanoscale Res. Lett."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1007\/s11082-020-02433-2","article-title":"Investigation of graphene fractal frequency selective surface loaded terahertz absorber","volume":"52","author":"Mishra","year":"2020","journal-title":"Opt. Quantum Electron."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"114621","DOI":"10.1016\/j.physe.2021.114621","article-title":"Quad-band polarization-insensitive metamaterial perfect absorber based on bilayer graphene metasurface","volume":"128","author":"Zamzam","year":"2021","journal-title":"Phys. E Low-Dimens. Syst. Nanostruct."},{"key":"ref_49","unstructured":"Sayeed, M.A., and Rouf, H.K. (2018, January 27\u201328). Fabrication and Characterization of Zinc Selenide (ZnSe) Thin Film in Solar Cell Applications. Proceedings of the International Conference on Innovations in Science, Engineering and Technology, Chittagong, Bangladesh."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"5903","DOI":"10.1007\/s11664-020-08320-6","article-title":"Hydrothermally Synthesized ZnSe Nanoparticles for Relative Humidity Sensing Application","volume":"49","author":"Choudhari","year":"2020","journal-title":"J. Electron. Mater."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"1902183","DOI":"10.1002\/adom.201902183","article-title":"Facile Synthesis of 2D Tin Selenide for Near- and Mid-Infrared Ultrafast Photonics Applications","volume":"8","author":"Zhenhong","year":"2020","journal-title":"Adv. Opt. Mater."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1016\/j.optcom.2015.10.031","article-title":"A photo excited broadband switchable metamaterial absorber with polarization-insensitive and wide-angle absorption for terahertz waves","volume":"36","author":"Cheng","year":"2016","journal-title":"Opt. Commun."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Cheng, Y.Z., Huang, M.L., Chen, H.R., Guo, Z.Z., Mao, X.S., and Gong, R.Z. (2017). Ultrathin six-band polarization-insensitive perfect metamaterial absorber based on a cross-cave patch resonator for terahertz waves. Materials, 10.","DOI":"10.20944\/preprints201703.0022.v1"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"104344","DOI":"10.1016\/j.rinp.2021.104344","article-title":"An ultrathin and dual band metamaterial perfect absorber based on ZnSe for the polarization-independent in terahertz range","volume":"26","author":"Abdulkarim","year":"2021","journal-title":"Results Phys."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"7165","DOI":"10.1364\/OE.20.007165","article-title":"Interference theory of metamaterial perfect absorbers","volume":"20","author":"Chen","year":"2012","journal-title":"Opt. Express"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1016\/j.optlastec.2012.11.016","article-title":"A polarization-insensitive and omnidirectional broadband terahertz metamaterial absorber based on coplanar multi-squares films","volume":"48","author":"Cheng","year":"2013","journal-title":"Opt. Laser Technol."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"338","DOI":"10.1364\/OME.447855","article-title":"Simulation and lithographic fabrication of a triple band terahertz metamaterial absorber coated on flexible polyethylene terephthalate substrate","volume":"12","author":"Abdulkarim","year":"2022","journal-title":"Opt. Mater. Express"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"058401","DOI":"10.1088\/1674-1056\/ac2b1c","article-title":"Simulated and experimental studies of a multi-band symmetric metamaterial absorber with polarization independence for radar applications","volume":"31","author":"Hema","year":"2022","journal-title":"Chin. Phys. B"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"1068","DOI":"10.1080\/09205071.2015.1034327","article-title":"Analytic solution to field distribution in two-dimensional inhomogeneous waveguides","volume":"29","author":"Tatjana","year":"2015","journal-title":"J. Electromagn. Waves Appl."}],"container-title":["Symmetry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-8994\/14\/7\/1477\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T23:53:48Z","timestamp":1760140428000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-8994\/14\/7\/1477"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,7,19]]},"references-count":59,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2022,7]]}},"alternative-id":["sym14071477"],"URL":"https:\/\/doi.org\/10.3390\/sym14071477","relation":{},"ISSN":["2073-8994"],"issn-type":[{"value":"2073-8994","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,7,19]]}}}