Projektiranje i karakterizacija digitalno upravljanog širokopojasnog atenuatora

undergraduate thesis

• Title (english): Design and characterization of a digitally controlled broadband attenuator
• Author: Ivan Skeledžija
• Mentor: Adrijan Barić (mentor)
• Committee member: Adrijan Barić (predsjednik povjerenstva)
• Committee member: Josip Bačmaga (član povjerenstva)
• Committee member: Hrvoje Štimac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2018-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Cilj završnog rada bio je projektirati digitalni sustav za upravljanje širokopojasnim atenuatorom HMC424ALP3E i karakterizirati ga u frekvencijskom rasponu od 300kHz do 8GHz vektorskim analizatorom mreža. Analogni i digitalni dio sklopa nalaze se na zasebnim dvoslojnim tiskanim pločicama koje je bilo potrebno dizajnirati. Za RF tiskanu pločicu korišten je supstrat Rogers RO4350B. Prilagođenje impedancije izvedeno je metodom Coplanar waveguide with ground. Napisan je program s grafičkim sučeljem u Pythonu koji upravlja radom PIC mikrokontrolera i omogućuje postavljanje atenuacije unutar zadanih granica. Provjerena je ispravnost rada sklopa i vektorskim analizatorom mreža izmjereni su raspršni parametri za stupnjeve prigušenja od 1dB do 31.5dB, s korakom od 1dB. Nacrtani su dijagrami atenuacije, ulaznih i izlaznih povratnih gubitaka te uspoređeni s tehničkim specifikacijama atenuatora. Na temelju uočenih sličnosti i razlika komentiran je rad sustava.

Abstract (english)

The goal of this bachelor's thesis was to design a digital system for controlling a HMC424ALP3E broadband attenuator and characterize it in the frequency range from 300kHz to 8GHz using a vector network analyzer. The analog and digital parts of the system are on separate two-layer printed circuit boards, both of which needed to be designed. For the RF PCB, a Rogers RO4350 laminate was used. Impedance matching was done using a coplanar waveguide with ground. A program with a GUI was written in Python, which sends data to a PIC microcontroller and allows setting the attenuation level within specified limits. After verifying the system was working correctly, S-parameters were measured using a vector network analyzer for attenuation levels from 1dB to 31.5dB in 1dB steps. Attenuation, input return loss and output return loss diagrams were created and compared with the attenuator's datasheet. Similarities and differences were observed and the operation of the whole system was discussed.

• Keywords: širokopojasni atenuator; PIC mikrokontroler; USB komunikacija; RF dizajn; raspršni parametri; vektorski analizator mreža; mikrovalno područje
• Keywords (english): broadband attenuator; PIC microcontroller; USB communication; RF design; scattering parameters; vector network analyzer; microwave frequency band
• Language: croatian
• URN:NBN: urn:nbn:hr:168:804807
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-14 00:44:25