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This paper presents a Substrate Integrated Waveguide (SIW) directional coupler with required phase-difference at the output ports. In order to verify the feasibility of this design method, a 45° and a 90° SIW coupler are designed, simulated and optimized. The results of simulations have shown the great performances over a broad operational bandwidth.
This paper presents a dual-polarized switched beam antenna that is used for small base station in LTE environment at frequency 2.6 GHz. The proposed antenna has three layers with square patches and C-shaped slots in symmetrical arrangement. It is fed through two ports simultaneously using switched line phase shifter. The antenna array provides three-beam switching in both horizontal and vertical plane...
A method to evaluate reflection coefficients accurately by using a hybrid coupler and a sliding short is modified to save measurement time. For modified method, a digital phase shifter is used to vary the phase of reference standard. Radiation efficiency based on Wheeler method for a monopole antenna is evaluated by the modified method to confirm the effectiveness of using the digital phase shifter...
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