Analysis of reflector antenna systems by means of new conical wave objects

doctoral thesis

• Title (croatian): Analiza reflektorskih antenskih sustava pomoću novih konusnih valnih objekata
• Author: Siniša Škokić
• Mentor: Zvonimir Šipuš (mentor)
• Mentor: Stefano Maci (komentor); VIAF: 48394067
• Committee member: Juraj Bartolić (predsjednik povjerenstva)
• Committee member: Darko Žubrinić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2010-04-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

This dissertation discusses a method of analysing reflector antenna systems by means of a new type of wave objects. By expanding the electric field spectrum in a sum of complex exponentials (GPOF expansion), the radiation integral reduces to a sum of simpler integrals which can be solved in closed form, whereby each of them represents one wave object that rigorously satisfies the wave equation. Vector electromagnetic fields are calculated from these wave objects via auxiliary vector potentials, while the reflection of the electromagnetic wave from curved metallic reflectors is treated with Physical Optics. The main advantage of this novel hybrid method is that it can be repeated without increasing the demands on computer resources, enabling fast analysis of a sequence of reflectors. To verify its validity, the method has been translated into a computer programme for analysing a sequence of ellipsoidal reflectors. The results are compared to those obtained with available commercial electromagnetic simulators and to reference results calculated via direct numerical integration. The developed method is shown to be as accurate as pure Physical Optics analysis, while performing much faster in case of multi-reflector systems.

Abstract (croatian)

U radu se obrađuje metoda analiziranja reflektorskih antenskih sustava primjenom nove vrste
valnih objekata. Razvojem prostornog spektra električnog polja na sumu eksponencijalnih
funkcija s kompleksnim eksponentima (GPOF aproksimacija), radijacijski integral svodi se na
sumu jednostavnijih integrala koje je moguće riješiti analitičkim putem, pri čemu svaki tako
dobiveni integral označava jedan valni objekt koji rigorozno zadovoljava valnu jednadžbu.
Veza valnih objekata s elektromagnetskim poljem uspostavlja se upotrebom vektorskih
potencijala. U svrhu računanja refleksije od zakrivljenih metalnih površina, metoda je
povezana s fizikalnom optikom u novu hibridnu metodu. Ovakva procedura je ponovljiva i
omogućuje analiziranje niza reflektora bez povećavanja zahtjeva na računalne resurse. Za
provjeru valjanosti opisane metode razvijena je programska podrška za analiziranje niza
elipsoidnih reflektora. Dobiveni rezultati uspoređeni su s rezultatima dobivenim postojećim
metodama ugrađenim u komercijalne elektromagnetske simulatore, kao i s egzaktnim
rezultatima dobivenim izravno numeričkim integriranjem. Razvijena metoda jednako je točna
kao metoda Fizikalne optike, a omogućuje znatno kraća vremena proračuna pri analizi sustava
s više reflektora.

• Keywords: quasi-optical systems; reflector antennas; beam waveguides; numerical methods; physical optics; wave objects; complex conical beams; GPOF approximation; Gaussian beams
• Keywords (croatian): kvazioptički sustavi; reflektorske antene; valovod snopa; numeričke metode; fizikalna optika; valni objekti; složeni stožasti snop; GPOF aproksimacija; Gaussov snop
• Language: english
• URN:NBN: urn:nbn:hr:168:505709
• Promotion: 2010
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: 159 str. : graf. prikazi
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-19 15:36:42