Open AccessOn‐chip miniaturised wideband rat‐race coupler using integrated passive device technology
Author(s) -
Tseng YingCheng,
Ma TzyhGhuang
Publication year - 2014
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2013.0446
Subject(s) - wideband , rat race coupler , hybrid coupler , coplanar waveguide , materials science , chip , electrical engineering , optoelectronics , electronic engineering , power dividers and directional couplers , engineering , telecommunications , microwave
In this study, a miniaturised wideband rat‐race coupler using glass integrated passive device (GIPD) technology is studied. The circuit miniaturisation is achieved using slow‐wave synthesised coplanar waveguides (CPWs). For wideband operation, a compact CPW phase inverter is developed and integrated. At the centre frequency, 12 GHz, the proposed rat‐race coupler is only 6.5% the size of a conventional 1.5‐λ g ring coupler with the same GIPD technology; the fractional bandwidths, on the other hand, reach 65 and 32%, respectively, at the sum and difference ports. The coupler shows good amplitude and phase balances, with the transmission loss around 0.7–1.1 dB at the centre frequency.