A new class of dual-mode directional couplers for compact dual-polarization beam-forming networks

1997 ◽  
Vol 7 (9) ◽  
pp. 300-301 ◽  
Author(s):  
F. Alessandri ◽  
R. Ravanelli
Keyword(s):  
Beam Forming ◽  
Dual Polarization ◽  
Dual Mode ◽  
Directional Couplers ◽  
New Class

Generating Dual-Polarization Dual-Mode OAM Based on Transmissive Metasurface

2019 ◽  
Author(s):  
Xin Qi ◽  
Zheyuan Zhang ◽  
Xianzheng Zong ◽  
Xiaofeng Que ◽  
Zaiping Nie ◽  
...  
Keyword(s):  
Dual Polarization ◽  
Dual Mode

Broadband coupled-line directional couplers with high impedance transformation ratio

2017 ◽  
Vol 9 (7) ◽  
pp. 1473-1480
Author(s):  
Krzysztof Wincza ◽  
Slawomir Gruszczynski
Keyword(s):  
Theoretical Analysis ◽  
Frequency Range ◽  
Directional Couplers ◽  
Coupled Line ◽  
New Class ◽  
High Impedance ◽  
Transformation Ratio ◽  
Limiting Condition

A new class of 3-dB impedance transforming directional couplers has been proposed in which the recently published coupled-line couplers, consisting of coupled-line sections having different electrical lengths, have been utilized. The main advantage of the proposed directional couplers is the possibility of obtaining high impedance transformation ratio, thus the known limiting condition of realizable impedance transformation in 3-dB couplers is overcome. Moreover, the proposed directional couplers feature significantly wider operational bandwidths. The theoretical analysis of the proposed impedance-transforming directional couplers has been shown and is fully supported by the measurements of the manufactured model operating in 0.5–1.5 GHz frequency range.

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