Non-Invasive Microwave Radiometric System for Intracranial Applications: A Study Using the Conformal L-Notch Microstrip Patch Antenna

Asimakis, Nikolaos P.; Karanasiou, Irene S.; Uzunoglu, N.K.

doi:10.2528/pier10122208

Cited by 42 publications

(24 citation statements)

References 25 publications

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“…This topology is expected to be very suitable in view of the specific features needed for the patch current amplitude and phase distributions: when the E-vector of the excitation field is parallel to the slotted side of the patch, the radiation field has predominantly a linear polarization. It is worth mentioning that, to the knowledge of the authors, no slotted strip-frame patches of this kind have ever been used in printed planar or cylindrical antennas [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. It is clearly shown in this paper that slotted strip-frame patches are effective for cylindrical microstrip antenna arrays (CMAAs) fed by a cylindrical microstrip line.…”

Section: Introductionmentioning

confidence: 96%

Cylindrical Microstrip Array Antennas With Slotted Strip-Framed Patches

Svezhentsev¹,

Kryzhanovskiy²,

Vandenbosch³

2013

PIER

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Abstract-A cylindrical microstrip array antenna with 5 pairs of coupled slotted strip framed patches is analyzed. The patches are proximity-fed by a cylindrical microstrip line. In order to extract the reflection coefficient from the standing wave pattern on the microstrip line, its length is about 5 wavelengths. To the best of the authors' knowledge proximity-fed cylindrical arrays have not been analyzed before using a rigorous MOM model that takes into account all electromagnetic couplings between patches and feeding line. The paper consists of three parts. The first part describes a plane wave excitation of the cylindrical microstrip structure. It introduces some innovating theoretical developments, like the improvement of the asymptote for the spectral Green's function and the explicit surface wave contribution. The second part calculates the radar cross section of the cylindrical microstrip structure with single and coupled slotted strip framed patches. The resonant frequencies, and the amplitude and phase of the current distribution are analysed. The third part describes a design for a proximity-fed array of 5 coupled slotted strip framed patches. It gives the reflection coefficient, current distribution on the patches, and radiation pattern. A very low level of cross polarization (< −40 dB) is achieved. It is shown that the resonant frequencies of the cylindrical array and its planar analogue lie very close to each other. This is due to the common nature of the low frequency slot resonance for the slotted strip framed patch.

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Section: Introductionmentioning

confidence: 96%

Cylindrical Microstrip Array Antennas With Slotted Strip-Framed Patches

Svezhentsev¹,

Kryzhanovskiy²,

Vandenbosch³

2013

PIER

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“…In all these cases the amount of memory requirement for inversion calculation will increase significantly, therefore iterative methods become more suitable techniques for large scale computation. The same problem may occur in a number of other inverse problems [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Magnetic Induction Tomography Imaging Using a Matrix Free Krylov Subspace Inversion Algorithm

Wei¹,

Soleimani²

2012

PIER

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Abstract-Magnetic induction tomography (MIT) attempts to image the passive electromagnetic properties (PEP) of an object by measuring the mutual inductances between pairs of coils placed around its periphery. In recent years, there has been an increase in applications of non-contact magnetic induction tomography. When finite element-based reconstruction methods are used, that rely on the inversion of a derivative operator, the large size of the Jacobian matrix poses a challenge since the explicit formulation and storage of the Jacobian matrix could be in general not feasible. This problem is aggravated further in applications for example when the number of coils is increased and in three-dimension. Krylov subspace methods such as conjugate gradient (CG) methods are suitable for such large scale inverse problems. However, these methods require use of the Jacobian matrix, which can be large scale. This paper presents a matrix-free reconstruction method, that addresses the problems of large scale inversion and reduces the computational cost and memory requirements for the reconstruction. The idea behind the matrixfree method is that information about the Jacobian matrix could be available through matrix times vector products so that the creation and storage of big matrices can be avoided. Furthermore the matrix vector multiplications were performed in multiple core fashion so that the computational time can decrease even further. The method was tested for the simulated and experimental data from lab experiments, and substantial benefits in computational times and memory requirements have been observed.

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“…In spite of many advantages, these antennas suffer from some disadvantages which include their low efficiency, low power, high Q, poor polarization purity, spurious feed radiation and very narrow bandwidth [11][12][13][14][15][16][17]. There have been some efforts spent using various techniques to improve the performance of such antennas for their widespread applications.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement of Microstrip Antenna Array Using Dummy Ebg Pattern on Feedline

Gujral¹,

Li²,

Yuan³

et al. 2012

PIER

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Abstract-Microstrip patch antennas have several advantages over conventional antennas including their low profile structure, light weight and low cost. As such, they have been widely used in a variety of applications. However, one of the major drawbacks of this antenna is the low bandwidth. In this paper, bandwidth of a dual patch antenna is improved by etching dummy EBG pattern on the feedline. Effects of different positions of the feedline on the bandwidth are also studied. A good improvement in bandwidth for the antenna with the dummy EBG pattern when compared to the reference antenna is obtained for all the feedline positions.

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Non-Invasive Microwave Radiometric System for Intracranial Applications: A Study Using the Conformal L-Notch Microstrip Patch Antenna

Cited by 42 publications

References 25 publications

Cylindrical Microstrip Array Antennas With Slotted Strip-Framed Patches

Cylindrical Microstrip Array Antennas With Slotted Strip-Framed Patches

Three-Dimensional Magnetic Induction Tomography Imaging Using a Matrix Free Krylov Subspace Inversion Algorithm

Bandwidth Improvement of Microstrip Antenna Array Using Dummy Ebg Pattern on Feedline

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