Title :
A novel low loss microwave multiplexer design based on directional filters
Author :
Neubauer, Volker ; Mayer, Markus ; Magerl, Gottfried
Author_Institution :
Dept. of Meas. Techniques & Circuit Design, Vienna Univ. of Technol., Austria
Abstract :
A novel design method for directional filters is presented which reduces transmission loss and insertion loss. The theoretical background of directional filters is given, the frequency characteristics and transmission loss are discussed and parameters responsible for the requirements of a low loss application are worked out. A 50 Ω multiplexer was built to act as a bandpass filter bank to separate the fundamental, second and third harmonic frequencies at the input and at the output of a digital audio broadcast (DAB) power amplifier. Finally, measurement results are compared with simulations and the improvements with respect to multiplexers previously presented are pointed out.
Keywords :
channel bank filters; digital audio broadcasting; directional couplers; microwave filters; microwave power amplifiers; mobile radio; multiplexing equipment; DAB power amplifier; bandpass filter bank; digital audio broadcast; directional filters; frequency characteristics; harmonic frequencies; insertion loss; low loss microwave multiplexer; mobile communications; transmission loss; Band pass filters; Design methodology; Filter bank; Frequency; Insertion loss; Microwave filters; Multiplexing; Power harmonic filters; Power system harmonics; Propagation losses;
Conference_Titel :
Radio and Wireless Conference, 2002. RAWCON 2002. IEEE
Print_ISBN :
0-7803-7458-4
DOI :
10.1109/RAWCON.2002.1030166
