Low loss substrate integrated waveguide n-way power divider

Mohammadi, Pejman
Substrate Integrated Waveguide (SIW) technology has been used in designing and fabricating SIW n-way power dividers. In this thesis employing this technology three-port and five-port SIW power dividers are designed and fabricated. These structures are compact in size and the design procedure can be expanded into n-port power dividers. These structures are used with microstrip transition parts however measurement of S-parameters of the main structure are required for comparison. This is carried out with a special algorithm based on TRL calibration method. This method is general for reconstructing the S-parameters of the n-port network. For the three-port SIW power divider the measured return loss is below 10 dB and transmission is measured between -3.5 dB and -4 dB over a frequency band from 9 GHz to 11 GHz. The measured amplitude balance is less than ±0.5 dB from 9.5 GHz to 11 GHz and the measured phase difference between ∠S21 and ∠S31 is about 4 degrees. There is a good agreement between simulation and measurement results over the frequency band from 9.5 GHz to 10.5 GHz for five-port SIW power divider. Based on the total loss mechanisms in SIW structure low loss SIW three-port and five-port power dividers have been designed. A three-port partially filled SIW power divider has been constructed. Its measurement results show that transmissions are between -3 dB and -3.5 dB from 8.75 GHz to 10 GHz and the return loss is less than 10 dB in the same frequency band. The measured amplitude balance is less than ±0.2 dB over frequency band from 8.75 GHz to 10 GHz and the measured phase difference between ∠S21 and ∠S31 is about 4 degrees.


K band substrate integrated waveguide power dividers /
Kiriş, Orçun; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2014)
In this thesis, various K band power divider structures are developed using the substrate integrated waveguide (SIW) technology. In the design and production of the 1 x 2 Y and T - Junction power dividers known as the conventional power divider types, good agreements are observed between measured and simulated S11 results. Also, the differences between simulated and measured S21 results are approximately 0.4 – 0.8 dB at the operating frequency. In addition to these, 1 x 4 dividers obtained by successive add...
Substrate integrated waveguide unequal power divider with adjustable dividing ratio
Mohammadi, P.; Demir, Şimşek (2014-01-01)
An unequal power divider with substrate integrated waveguide technology has been designed. This structure is compact in size and has the capacity to develop to the n-port unequal power divider. Its output powers ratio is also adjustable. The output powers can be easily change by varying the width of the output ports. The design procedure has been done analytically. Then a two-way unequal SIW power divider is designed. Simulation results of the proposed structure shows that return loss is below than10dB from...
X-band RF switch implementation in substrate integrated waveguide
Erdöl, Tuncay; Demir, Şimşek; Department of Electrical and Electronics Engineering (2012)
An RF switch in substrate integrated waveguide (SIW) technology for X-band is designed and demonstrated. Design is based on embedding shunt pin diodes of the switch in an evanescent mode waveguide filter. At reverse bias, pin diodes formed a part of filter's capacitances. Thus switch also functions as a filter when it is in “on” state. At forward bias of diodes, capacitances of the filter are short circuited to obtain a good isolation. The same circuit structure is used to design a tunable filter and an RF ...
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Ünlü, Mehmet; Demir, Şimşek; Akın, Tayfun; Department of Electrical and Electronics Engineering (2003)
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We report on fabrication of plasmonic interfaces consisting of Ag nanoparticles on flat and textured Al:ZnO for use at the front surface of thin film solar cells to enhance light trapping and photo-conversion efficiencies. We show that outstandingly high transmittance haze is achieved from single step HCl surface textured Al:ZnO and demonstrate Ag dewetting on textured and flat Al:ZnO surfaces upon annealing at moderate temperatures. Optical response of these plasmonic interfaces clearly display plasmonic r...
Citation Formats
P. Mohammadi, “Low loss substrate integrated waveguide n-way power divider,” Ph.D. - Doctoral Program, Middle East Technical University, 2012.