Dual frequency coaxial rotary joint with multi-stepped transition

2010 ◽  
Vol 2 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Soumyabrata Chakrabarty ◽  
Vijay Kumar Singh ◽  
Shashi Bhusan Sharma
Keyword(s):  
Rectangular Waveguide ◽  
Coaxial Waveguide ◽  
Dual Frequency ◽  
Dual Channel ◽  
Rotary Joint ◽  
Tem Mode ◽  
Channel Mode ◽  
Waveguide Design ◽  
Transverse Electromagnetic ◽  
Waveguide Transitions

The present paper presents the design and development of a dual-channel microwave rotary joint using coaxial waveguide as primary waveguide and rectangular waveguide as the secondary waveguide. Design is presented at 5.85–7.02 GHz with 20% bandwidth and at 14–14.5 GHz bands with 3.6% bandwidth using dual channel mode transducers exciting transverse electromagnetic (TEM) mode in the coaxial waveguide. Rectangular to coaxial waveguide transitions employing multi-stepped doorknob transitions are used to excite the TEM mode from the rectangular waveguide. The measured results for electrical parameters such as return loss, insertion loss of the dual-channel rotary joint are presented with 360° rotation of the rotary part with respect to the stator part.

scholarly journals Design and Analysis of a TEM Mode Rectangular Coaxial Waveguide for Mobile 5G Millimeter Wave Antenna Module Applications

2020 ◽  
Vol 20 (3) ◽  
pp. 169-175
Author(s):  
Eunyoung Park ◽  
Sangkil Kim
Keyword(s):  
Millimeter Wave ◽  
Integrated Circuit ◽  
Mapping Method ◽  
Waveguide Structure ◽  
Coaxial Waveguide ◽  
Layer By Layer ◽  
3D Fem ◽  
Tem Mode ◽  
Transverse Electromagnetic ◽  
Antenna Module

In this paper, design and analysis of a transverse electromagnetic (TEM) mode rectangular coaxial waveguide for a mobile 5G millimeter wave (mmWave) antenna module are presented. General structures of 5G radio frequency (RF) module for mobile sub-6 GHz and mmWave applications are also discussed in this paper. Thorough analysis of transmission line and waveguide structures at mmWave frequency band is essential and fundamental information to design highly integrated RF front-end modules. Theoretical design equations of the waveguide, such as impedance, loss, and radiation are presented, and the equations are verified by a full wave 3D FEM electromagnetic simulator. Impedance value of the rectangular waveguide structure was calculated using the conformal mapping method. Theoretical operation frequency bandwidth and design guide are also presented. The characteristics and analysis of the rectangular coaxial waveguide structure presented in this paper is easily scalable to other frequency bands. The proposed design equations are also applicable to various planar layer-by-layer integrated circuit (IC) or module manufacturing process.

Analysis and design of TEM-TE11 coaxial waveguide bend mode converters

2019 ◽  
Vol 12 (3) ◽  
pp. 198-204 ◽  
Author(s):  
Qiang Zhang ◽  
Xuhao Zhao ◽  
Chengwei Yuan ◽  
Jiande Zhang
Keyword(s):  
Mode Coupling ◽  
Theoretical Calculations ◽  
Coaxial Waveguide ◽  
Coupling Coefficients ◽  
Electromagnetic Mode ◽  
Analysis And Design ◽  
Mode Converters ◽  
Transverse Electromagnetic ◽  
Conversion Efficiencies ◽  
Waveguide Bend

AbstractTwo coaxial waveguide bend mode converters that transform coaxial transverse electromagnetic mode to TE11 coaxial waveguide mode are presented in this paper. Both converters are designed and optimized on the basis of the strictly derived mode coupling coefficients. Conversion efficiencies of both converters are over 99% and the power-handling capacities reach a gigawatt level. The combined dual-bend mode converter is fabricated and tested. The experimental results coincide well with the theoretical calculations and simulations, which demonstrates the feasibility of the designed converter.

scholarly journals Introducing of Online Channel and Management Strategy for Green Agri-food Supply Chain based on Pick-Your-Own Operations

2019 ◽  
Vol 16 (11) ◽  
pp. 1990 ◽  
Author(s):  
Qifan Hu ◽  
Qianyun Xu ◽  
Bing Xu
Keyword(s):  
Supply Chain ◽  
Food Supply ◽  
Food Supply Chain ◽  
Farmer Cooperatives ◽  
Dual Channel ◽  
Green Food ◽  
Online Channel ◽  
Channel Mode ◽  
Optimal Mode ◽  
Brand Effect

The popularity of e-commerce has impacted traditional retail business. Farmer cooperatives running green agri-food pick-your-own (PYO) farms are facing the choice of whether or not to adopt online channels. PYO operation refers to consumers picking and purchasing the agri-food growing on a farm, and due to it being environmentally-friendly, healthy, and popular, it has been widely adopted by many farm cooperatives. This paper aims to discuss the practicality of introducing online channels to already established PYO farms in the green agri-food supply chain (GASC), who can personally take charge of the online channel or transfer it to one online retailer. Firstly, we constructed the demand functions of green agri-food by putting consumer utility, the freshness of agri-food, and transportation cost into consideration. Secondly, five decision models are built to characterize five operation modes, namely pure PYO mode, self-operated dual-channel mode, decentralized dual-channel mode, centralized dual-channel mode, and contractual cooperation mode. Furthermore, by taking price, demand, and profit with different modes into consideration, we are able to explore the introduction of online channels and green brand construction. Finally, numerical analysis is performed. We found that: (1) introducing an online channel is preferable strategy since the profit of the farmer cooperative in pure PYO mode is always less than the profit of a farmer cooperative in non-self-operated dual-channel modes; (2) the decision of self-operating an online channel is related to the fixed cost of creating a new online channel and the green food brand effect of online channel, and it is the optimal mode in some cases, while the contractual cooperation mode is the optimal mode in the remaining cases; and (3) the green food brand effect of online channels is does not necessarily improve with scale, and the initial freshness has a positive relationship to the profit, demand, and price of farmer cooperatives and online retailers.

Dual-channel bidirectional optical rotary joint

1985 ◽  
Author(s):  
Y. C. Shi ◽  
L. Klafter ◽  
E. E. Harstead
Keyword(s):  
Dual Channel ◽  
Rotary Joint
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