Filtry mikrofalowe w systemach radiokomunikacyjnych

• Autorzy: Abramowicz A.

Warianty tytułu

EN

Microvawe filters in radiocommunication systems

• Języki publikacji: PL

Abstrakty

PL

W pracy zawarto opis teorii i metod projektowania filtrów mikrofalowych stosowanych w systemach radiokomunikacyjnych. Przedstawiona teoria dotyczy projektowania w oparciu o założoną charakterystykę tłumienia wznoszonego filtru. Na podstawie charakterystyki syntezuje się macierz sprzężeń między rezonatorami filtru. Typowa synteza wykorzystuje idealne inwertery immitancji. Przedstawiono wynikające z tego ograniczenia. Posługując się metodą częstotliwości własnych porównano zachowanie się sprzężonych rezonatorów mikrofalowych z teorią sprzężeń poprzez idealne i rzeczywiste inwertery, wykazując wyższość inwerterów rzeczywistych. Wykazano istnienie dwóch różnych definicji współczynnika sprzężenia między rezonatorami zależnie od stosowanych inwerterów. Podano związek między współczynnikami sprzężenia definiowanymi dla idealnych i rzeczywistych inwerterów, który wykorzystano w metodzie projektowej filtrów szerokopasmowych. Przedyskutowano niejednoznaczność definicji częstotliwości środkowej i względnej szerokości pasma filtru. Pokazano, że macierz sprzężeń może mieć dwie postaci w przypadku filtrów o niesymetrycznch charakterystykach amplitudowych. Zapropnowano nową metodę określania znaków sprzężeń między rezonatorami filtru mikrofalowego. Przedstawiono przykłady realizacji sprzężeń różnych znaków w filtrach grzebieniowych, dwurodzajowych filtrach planarnych i filtrach z rezonatorami dielektrycznymi.

EN

This monograph describes the theory and design methods of microwave filters employed in radiocommunication systems. The theory is based on the insertion loss approach to the approximation and synthesis problem of filters. Assuming the prescribed transmission characteristics the coupling matrix is synthesized or opimized. Ideal immitance inverters are used in classical synthesis. The drawbacks and limitations of the synthesis method due to use of ideal inverters are presented. The advantages of real inverters or ideal inverters is describing couplings between microwave resonators are shown. Employing the eigenfrequency method two different definitions of the coupling coefficient are stated. The formula relating them is developed. The new design method for wide band filters is presented. The relative filter bandwidth and filter center frequency are shown to be not uniquely defined. The possibility to obtain two forms of the coupling matrix for un symmetric filter characteristics is explained. The new method for determining the sign of the coupling between microwave filter resonators is described. The realizations of the comb-line filters, ring and path dual-mode planar filters and dielectric resonator filters with transmission zeros are described.

Słowa kluczowe

PL

filtry mikrofalowe; synteza filtrów; inwertery; sprzężenia elektromagnetyczne

EN

microwave filters; filter synthesis; inverters; electromagnetic coupling

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Prace Naukowe Politechniki Warszawskiej. Elektronika
• Rocznik: 2008
• Tom: z. 162
• Strony: 1--153
• Opis fizyczny: Bibliogr. 326 poz., tab., rys., wykr.

Twórcy

autor

Abramowicz A.

• Instytut Systemów Elektronicznych Politechniki Warszawskiej

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