A novel broad-band Chebyshev-response rat-race ring coupler
- 1 April 1999
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 47 (4) , 455-462
- https://doi.org/10.1109/22.754879
Abstract
A novel broad-band rat-race ring coupler with a unit element at each port and an ideal phase inverter at one of the ring arms is proposed and analyzed. Design equations based on Chebyshev equiripple functions are derived. The design curves of equal or unequal power division are also presented. Theoretical data show that the bandwidth of unequal power division with a specific return-loss value increases as the power division ratio increases or decreases from unity. For a 180/spl deg/ hybrid with equal power division (3 dB) and 15-dB return loss, the proposed rat-race ring may have a bandwidth of 4:1. Three circuits of this novel rat-race ring are realized using finite-ground-plane coplanar waveguide. The measured results match very well with the theory.Keywords
This publication has 10 references indexed in Scilit:
- A new wide-band and reduced-size uniplanar magic-TPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Uniplanar hybrid couplers using asymmetrical coplanar striplinesIEEE Transactions on Microwave Theory and Techniques, 1997
- Design formulas for generalised 180° hybridring couplersElectronics Letters, 1994
- New uniplanar coplanar waveguide hybrid-ring couplers and magic-T'sIEEE Transactions on Microwave Theory and Techniques, 1994
- Design of new hybrid-ring, directional coupler using lambda /8 or lambda /6 sectionsIEEE Transactions on Microwave Theory and Techniques, 1991
- Coplanar Waveguides for MMIC Applications: Effect of Upper Shielding, Conductor Backing, Finite-Extent Ground Planes, and Line-to-Line CouplingIEEE Transactions on Microwave Theory and Techniques, 1987
- A Wideband Stripline Hybrid Ring (Correspondence)IEEE Transactions on Microwave Theory and Techniques, 1968
- Synthesis of Symmetrical Branch-Guide Directional CouplersIEEE Transactions on Microwave Theory and Techniques, 1968
- Direct Synthesis of Band-Pass Transmission Line StructuresIEEE Transactions on Microwave Theory and Techniques, 1965
- The Application of a New Class of Equal-Ripple Functions to Some Familiar Transmission-Line ProblemsIEEE Transactions on Microwave Theory and Techniques, 1964