Title :
An ultra-wideband coupled-line balun using patterned ground shielding structures
Author :
Sewiolo, Benjamin ; Hartmann, Marcus ; Waldmann, Benjamin ; Weigel, Robert
Author_Institution :
Friedrich-Alexander-Univ. Erlangen-Nuremberg, Erlangen
Abstract :
In this paper a new planar balun for UWB- applications has been developed using a two-stage Wilkinson divider for power splitting followed by two coupled line sections for plusmn90 phase shifting. Patterned ground shielding (PGS) is used to increase the even-mode and decrease the odd mode impedances. The compact balun structure covers an area of less than 5 mm2 and has been fabricated on a conventional double-layer printed circuit board to validate simulation results by measurement. The measured input and output return loss is below -10 dB from 3.5 to 10.5 GHz, so that a relative bandwidth of 100% is achieved. The measured insertion loss is about 0.5 dB by an acceptable phase imbalance over the operating frequency range. Measurements show a good agreement with the corresponding simulations.
Keywords :
antenna radiation patterns; baluns; microwave antennas; planar antennas; power dividers; ultra wideband antennas; UWB; frequency 3.5 GHz to 10.5 GHz; odd mode impedances; patterned ground shielding structures; phase imbalance; phase shifting; planar balun; power splitting; two-stage Wilkinson divider; ultra-wideband coupled-line balun; Area measurement; Bandwidth; Circuit simulation; Coupling circuits; Frequency measurement; Impedance matching; Loss measurement; Phase measurement; Printed circuits; Ultra wideband technology; Balun; Ultra-Wideband; coupled line; patterned ground shield; planar;
Conference_Titel :
Radio and Wireless Symposium, 2008 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-1462-8
Electronic_ISBN :
978-1-4244-1463-5
DOI :
10.1109/RWS.2008.4463528