Design of a Microwave Duplexer without Ferrite and without Magnet

F. Mejri, T. Aguili

Design of a Microwave Duplexer without Ferrite and without Magnet

Číslo: 2/2018
Periodikum: Radioengineering Journal
ISBN: 1210-2512
DOI: 10.13164/re.2018.0494

Klíčová slova: Duplexer, micro-strip structure, microwave, bipolar transistor, RF amplifier, polarization tee, Wilkinson power divider, Duplexer, mikropásová struktura, mikrovlnná trouba, bipolární tranzistor, RF zesilovač, polarizační odpaliště, Wilkinsonova dělička výkonu

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Anotace: In this paper we present the design, realization and characterization of a microwave duplexer, compact, easy to realize and integrate into systems such as ground penetrating radars. It is made without the use of ferrite or magnet. This device is designed in the S band and made in micro-ribbon technology. It consists of a power divider and two RF amplifiers, low gain, using a BFR91 bipolar transistor. The latter is frequently available and inexpensive. Measurements made on a vector network analyzer have shown a low insertion loss with insulation considered satisfactory – for low power applications - between the transmitter (Tx) and the receiver (Rx) circuits.