Sinteza maksimalno glatkih prostornih filtara temeljena na Gaussovom otvoru

master's thesis

• Title (english): Synthesis of Maximally Flat Spatial Filters Based on Gaussian Window
• Author: Mile Šakić
• Mentor: Goran Molnar (mentor)
• Committee member: Goran Molnar (predsjednik povjerenstva)
• Committee member: Mladen Vučić (član povjerenstva)
• Committee member: Dražen Jurišić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2021-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom radu započinje se s kratkim uvodom u antenske nizove uključujući osnove metoda dizajna s danim izrazima i neke od osnovnih karakteristika prostornih filtara općenito. Nastavlja se s opisom standardnog Gaussovog otvora i predložene linearne i kvadratne transformacije čija je svrha manipulacija određenim značajkama. Posebna pažnja u radu posvećena je kvadratnoj transformaciji standardnog Gaussovog otvora koja rezultira zrakom maksimalno ravnog vrha. Koristeći ovu transformaciju razvijena su dva postupka za generiranje Gaussovih nizova. Prvi je analitički postupak za sintezu Gaussovih filtara s ravnim vrhom i zadanom razinom bočnih latica. Drugi je numerički postupak za sintezu Gaussovih filtara s minimalnim dinamičkim rasponom koeficijenata. Minimalni dinamički raspon koeficijenta dobiven je kombiniranjem standardnog numeričkog postupka i korištenjem nizova s nultim koeficijentima. Na kraju ovog rada dana je usporedba dobivenih filtara s ostalim filtrima s ravnim vrhom i to su konkretno SRC (engl. sharpened raised cosine), GDC (engl. generalized Dolph-Chebyshev) i EDC (engl. exponential Dolph-Chebyshev). Filtri su uspoređeni prema četiri značajke dane u obliku tablica te su prikazani njihovi dijagrami zračenja.

Abstract (english)

This piece of work starts with a short introduction to antenna arrays including array design fundamentals with given expressions and some of the basic features of spatial filters in general. It proceeds with a description of a standard Gaussian window and it's proposed linear and quadratic transform whose purpose is manipulation of certain features. The focus of the work is on the quadratic transform of standard Gaussian window which results in a maximally flat top beam. Using this transform two procedures for generating Gaussian arrays are developed. The first one is the analytical procedure for the synthesis of flat top Gaussian filters with given sidelobe level. The another one is numerical procedure for the synthesis of flat top Gaussian filters with minimum dynamic range ratio. The minimum dynamic range ratio is obtained by combining the standard numerical procedure and the usage of arrays which have some elements equal to zero. At the end of this work the derived filters are compared with other spatial filters with flat top and specifically those are sharpened raised cosine (SRC), generalized Dolph-Chebyshev (GDC) and exponential Dolph-Chebyshev (EDC) filter. Filters are compared based on four features given in tables and respective beampatterns are shown.

• Keywords: prostorni filtri; antenska polja; dijagram zračenja; otvor s ravnim vrhom glavne latice; dinamički raspon koeficijenata; razina bočnih latica; Gaussov otvor
• Keywords (english): spatial filters; antenna arrays; beampattern; flat top window; dynamic range ratio; sidelobe level; Gaussian window
• Language: croatian
• URN:NBN: urn:nbn:hr:168:288596
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-13 16:13:27