BUTLER MATRIX IN MICROSTRIP-SLOT TECHNOLOGY
نویسندگان
چکیده
منابع مشابه
Microstrip Butler matrix design and realization for 7 T MRI.
This article presents the design and realization of 8 × 8 and 16 × 16 Butler matrices for 7 T MRI systems. With the focus on low insertion loss and high amplitude/phase accuracy, the microstrip line integration technology (microwave-integrated circuit) was chosen for the realization. Laminate material of high permittivity (ε(r) = 11) and large thickness (h = 3.2 mm) is shown to allow the best t...
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Proof of concept of a cavity backed slot antenna based on inverted microstrip gap waveguide (IMGW) technology is presented. Since the antenna is operating based on the first resonating mode of the cavity, it is more compact compared to the ordinary cavity backed slot antennas in which the second cavity mode is used for radiation. Furthermore, the proposed antenna element introduces lower lo...
متن کاملPlanar Butler Matrix Technology for 7 Tesla MRI
Introduction Variation of the B1 field distribution at high field causes variation of the flip angles inside the patient’s body which leads to shading in the acquired images. Numerous methods have been proposed to mitigate B1 inhomogeneity. More recently, it was shown that “B1 shimming” can be performed using multiple transmitters [1,2], but utilizing these additional transmit channels effectiv...
متن کاملPhase Error Corrections for Microstrip 8×8 Butler Matrix Used in 7 Tesla MRI
Abstract—This paper describes a method to estimate the fixed phase shifts of the Microstrip 8×8 Butler Matrix, realized in one substrate board which is designed and fabricated for our 7-Tesla Magnetic Resonance Imaging (MRI) system. This method is based on a global optimization problem to minimize a cost function including a variety of 64 functions as a function of the fixed phase shifts of the...
متن کاملApplication of Butler Matrix to a Tree Structure of Microstrip Antenna Array
The aim of this investigation is to realize a Butler matrix for a multibeam base station antenna dedicated to a U MTS application; this matrix has been realized with microstrip technology. The antenna associated with this application is a network of patches distributed in a tree structure and fed by electromagnetic coupling. The patch distribution structure used in this experiment allowed a g r...
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ژورنال
عنوان ژورنال: International Journal of Research -GRANTHAALAYAH
سال: 2017
ISSN: 2350-0530,2394-3629
DOI: 10.29121/granthaalayah.v5.i4.2017.1820