K band substrate integrated waveguide power dividers /

Kiriş, Orçun
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 addition of the conventional structures are designed and produced. The designed and fabricated Y & Y and T & Y - Junction SIW power dividers have approximately 0.6 dB and 0.4 dB insertion loss differences between the measurement and simulation results respectively. Moreover, there are good agreements between the S11 simulation and measurement results. Furthermore, a novel 1 x 8 power divider is proposed for unequal power division operation. The proposed divider is designed and fabricated to provide almost equal phases and -20 dB SLL Taylor (ñ=3) amplitude distribution at output ports. 8x1 and 8x4 slotted SIW arrays, fed through this power divider, are designed, fabricated and measured. Measurement results are compared with the simulations to verify the designs and measured far fields agree very well with the simulated ones.


Low loss substrate integrated waveguide n-way power divider
Mohammadi, Pejman; Demir, Şimşek; Department of Electrical and Electronics Engineering (2012)
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 spe...
Analysis and design of slotted substrate integrated waveguide antenna on cylindrical surface
Bayraktar, Ömer; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2014)
This thesis presents novel traveling wave conformal shunt slot arrays on cylindrical substrate integrated waveguide (CSIW) placed on a cylindrical surface in the circumferential direction at K-band. Mutual couplings of longitudinal slots on broad wall of CSIW are formulated and active admittance formulas of the slots are derived which are used in Elliott’s design procedure to design slotted CSIW arrays. The designs are carried out at 25 GHz using non-uniform and uniform slot separations. The non uniform slo...
Design and realization a quasi yagi antenna array and its feed system printed on a ceramic substrate for x-band radar applications
Atabay, Berkay; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2019)
This thesis includes design, simulation, realization and measurement of a four-element quasi- Yagi antenna array printed on a ceramic substrate for X-band radar applications. The microstrip array antenna is designed using four quasi-Yagi antennas in a linear configuration and is printed on Alumina 99.6% substrate made by Coorstek Corporation. The antenna can fit into small areas because of compact structure due to the use of high dielectric constant substrates. In addition, the use of alumina ceramic substr...
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 ...
Citation Formats
O. Kiriş, “K band substrate integrated waveguide power dividers /,” M.S. - Master of Science, Middle East Technical University, 2014.