All planar compact size microstrip CRLH arbitrary coupling directional coupler

2012 ◽  
Vol 55 (1) ◽  
pp. 115-119 ◽  
Author(s):  
Amr A. Ibrahim ◽  
Amr M. E. Safwat ◽  
Hadia El-Hennawy
Keyword(s):  
Directional Coupler ◽  
Arbitrary Coupling ◽  
Compact Size

Compact Size Directional Coupler for Mobile RFID Reader

2007 ◽  
Author(s):  
Jin-Wook Jung ◽  
Kwan-Kyu Nae ◽  
Jae-Hyun Bae ◽  
Eun-Jin Lee ◽  
Ha-Ryoung Oh ◽  
...  
Keyword(s):  
Directional Coupler ◽  
Rfid Reader ◽  
Compact Size ◽  
Mobile Rfid

scholarly journals Compact Full Ka-Band Waveguide Directional Coupler Based on Rectangular Aperture Array with Stairs

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 745
Author(s):  
Xida Deng ◽  
Ge Dong ◽  
Xuan Dai ◽  
Jinxiang Deng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Coupling Region ◽  
Broad Bandwidth ◽  
Rectangular Aperture ◽  
Compact Size ◽  
Power Split ◽  
Rectangular Waveguides ◽  
Aperture Array ◽  
Better Than

This article presents a compact 3 dB waveguide directional coupler with full waveguide bandwidth. It consists of a pair of rectangular waveguides with stairs structures in the coupling region. The waveguides are placed parallel to each other along their broad wall, which has a rectangular aperture array. The compact size, broad bandwidth, good in-band coupling flatness, and good return loss are achieved by using the proposed structure. For verification purposes, a prototype of the proposed coupler was designed, manufactured, and measured. The experimental results show that over the full waveguide bandwidth a return loss of input port better than 17.46 dB, coupling strength varying between −2.74 dB and −3.80 dB, power-split unbalance within 0.76 dB, and an isolation better than 20.82 dB were obtained. The length of the coupling region was only 15.82 mm.

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

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