The generalized scattering matrix of closely spaced strip and slot layers in waveguide

Yakovlev, Alexander B.; Khalil, A.; Hicks, Chris; Mortazawi, Amir; Steer, M.B.

doi:10.1109/22.817481

Cited by 22 publications

(19 citation statements)

References 14 publications

(27 reference statements)

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“…2. This is a generalized case of the module investigated in [15,16]. An arbitrarily-shaped metallization S m (electric layer) and apertures S a (magnetic layer) in a ground plane are placed at the interfaces of adjacent dielectric layers at z = z s and z = z n , respectively.…”

Section: Integral Equation Formulationmentioning

confidence: 99%

“…x , (15) and (16), one obtains the following system of equations for the four key unknown coefficients,  (14) are obtained from (15) and (16). Note that the presented procedure holds for cavities and infinite waveguides as well as semi-infinite waveguides terminated from either side.…”

Section: (Is)mentioning

confidence: 99%

“…Once the system (19) is solved for the key coefficients B zx , the remaining coefficients can be obtained from (15).…”

Section: (Is)mentioning

confidence: 99%

“…1). Narrowband resonant rectangular slot antennas used in earlier designs [15,16] are replaced by meander-slot antennas and their modifications [17,18], in order to increase the frequency bandwidth and efficiency of the system. The paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Potential Green's Dyadics of Multilayered Waveguide for Spatial Power Combining Applications

Lukić¹,

Yakovlev²

2002

PIER

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Abstract-Integral equation formulation and magnetic potentialGreen's dyadics for multilayered rectangular waveguide are presented for modeling interacting printed antenna arrays used in waveguidebased spatial power combiners. Dyadic Green's functions are obtained as a partial eigenfunction expansion in the form of a double series over the complete system of eigenfunctions of transverse Laplacian operator. In this expansion, one-dimensional characteristic Green's functions along a multilayered waveguide are derived in closed form as the solution of a Sturm-Liouville boundary value problem with appropriate boundary and continuity conditions. A method introduced here is based on the transmission matrix approach, wherein the amplitude coefficients of forward and backward traveling waves in the scattered Green's function in different dielectric layers are obtained as a product of transmission matrices of corresponding layers. Convergence of Green's function components in the source region is illustrated for a specific example of a two-layered, terminated rectangular waveguide.

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Section: Integral Equation Formulationmentioning

confidence: 99%

Section: (Is)mentioning

confidence: 99%

“…Once the system (19) is solved for the key coefficients B zx , the remaining coefficients can be obtained from (15).…”

Section: (Is)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Potential Green's Dyadics of Multilayered Waveguide for Spatial Power Combining Applications

Lukić¹,

Yakovlev²

2002

PIER

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“…2. For this purpose after obtaining LC prototype resonant response of each FSS, the shape of FSS can be designed by dividing its unit cell area into P × Q subsections and using GA [11,12]. The FSS geometry is represented in terms of 1 s and 0 s in the GA. 1 s and 0 s correspond to the nonmetal and metal parts of FSSs respectively.…”

Section: Introductionmentioning

confidence: 99%

Compact Spatial Band-Pass Filters Using Frequency Selective Surfaces

Ghorbaninejad-Foumani¹,

Khalaj‐Amirhosseini²

2011

PIER C

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Abstract-In this paper, spatial-band pass filters consisting of frequency selective surfaces (FSSs) are designed in order to realize both the desired transfer function of the filter in the frequency domain and drastic size reduction. Each FSS is made of aperture elements and patch elements. In this design method, the shape of each FSS is designed by a genetic algorithm (GA) so that the resonant curve of each FSS fits to the resonant curve which can be obtained from an equivalent circuit approach. By locating these designed FSSs at the intervals of quarter wavelength a spatial band pass filter is realized. Furthermore, a technique which controls the frequency response of each FSS has been applied to reduce the longitudinal size of filter. By this technique the FSSs are located at the intervals which are much shorter than a quarter wavelength, keeping the desired transfer function. Through a designed example it is shown that the half longitudinal length of a typical spatial filter can be obtained without any additional structure. Magnetic type spectral domain dyadic Green's functions are derived, and the characteristics of a spatial band-pass filter are calculated by means of the coupled magnetic filed integral equation which accurately takes higher order mode interactions. Derived linear matrix equations are solved using method of moment (MoM). The effectiveness of the proposed structure and its performance are verified and validated by designing and simulating an equal ripple spatial band pass filter at X-band.

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A novel waveguide bandpass filter with multiple attenuation poles using four‐armed square‐loop FSSs

Ohira

Deguchi

Tsuji

et al. 2007

Electron Comm Jpn Pt II

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SUMMARYThis paper presents a waveguide filter loaded with frequency selective surfaces (FSS) that can realize multiple attenuation poles. As the FSS resonant element, a squareloop FSS with arms is proposed. The authors have studied the design of the shape of the resonant element for the FSS by using the genetic algorithm (GA). There have been problems, namely, that the shape obtained by GA is complex and that the optimization design by GA requires a considerable amount of time. In this paper, these problems are eliminated by means of a square-loop FSS with arms. The proposed resonant element has a resonance (full transmission) at the center frequency while it has antiresonances (full reflection) on both sides. By means of these antiresonances, attenuation poles can be created. The resonant frequencies can easily be controlled by adjusting the element shape. As an example, a three-stage waveguide filter loaded with FSSs with a total of six attenuation poles in the X band is designed. By comparison of the numerical results and the experimental results, effectiveness of the proposed shape is verified.

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The generalized scattering matrix of closely spaced strip and slot layers in waveguide

Cited by 22 publications

References 14 publications

Magnetic Potential Green's Dyadics of Multilayered Waveguide for Spatial Power Combining Applications

Magnetic Potential Green's Dyadics of Multilayered Waveguide for Spatial Power Combining Applications

Compact Spatial Band-Pass Filters Using Frequency Selective Surfaces

A novel waveguide bandpass filter with multiple attenuation poles using four‐armed square‐loop FSSs

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