A new class of wideband multisection 180/spl deg/ hybrid rings using vertically installed planar couplers

A new class of wideband multisection 180deg hybrid rings using the vertically installed planar (VIP) coupler is proposed. On the basis of the reconfigured ideal single-section 180deg hybrid ring (i.e., the 180deg hybrid ring with an ideal phase inverter), the multisection 180deg hybrid rings can be...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-06, Vol.54 (6), p.2478-2486
Main Authors: Chi, Chun-Hsiang, Chang, Chi-Yang
Format: Article
Language:English
Subjects:
Bandwidth
Cascades
Couplers
Frequency
Impedance
Inverters
Mathematical analysis
Microwave antenna arrays
Microwaves
Multisection 180
phase inverter
Phase shifters
Phased arrays
Ports
Power transmission lines
Simulation
vertically installed planar (VIP) coupler
Wideband
wideband 180
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Summary:A new class of wideband multisection 180deg hybrid rings using the vertically installed planar (VIP) coupler is proposed. On the basis of the reconfigured ideal single-section 180deg hybrid ring (i.e., the 180deg hybrid ring with an ideal phase inverter), the multisection 180deg hybrid rings can be realized by properly cascading of single-section 180deg hybrid rings. Compared with the conventional hybrid ring, the two-section hybrid rings exhibit wide bandwidth, size reduction, and easily achievable high power-division ratios. Design equations based on the equal-ripple functions are derived. Design curves for the equal and unequal power-division ratio are also described. In addition, a cascade of single-section cascadable hybrid rings with a unit element at each I/O port can be used for bandwidth enhancement. Good agreement is obtained between the experimental and simulated results
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.875799