Corrections to “Simple, Fast, and Effective Identification of an Equivalent Circuit of a Waveguide Junction With $N$ Ports” [Jan 15 48-55]

Zappelli, L.

doi:10.1109/tmtt.2015.2392765

Cited by 3 publications

(16 citation statements)

References 1 publication

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“…Equations (15)- (17) replace the condition on the S-matrix (or Z-matrix) discussed in [12] for the reciprocal case.…”

Section: Non Reciprocal Lossless Devicementioning

confidence: 99%

“…The susceptances contained in the polygon network can be evaluated solving a linear equation system, starting from the knowledge of ζ rk , Equation (19), as described in [12]. The circuit parameters evaluated in the identification/synthesis procedure are related to the "kind" of the analyzed device.…”

Section: Non Reciprocal Lossless Devicementioning

confidence: 99%

“…Recently, an equivalent circuit for lossless N -port S-matrix has been defined using a very simple and efficient synthesis technique [12], based on a polygon network, with susceptances placed at the sides and at the diagonals of N -port polygon, and on N transmission lines connecting the device ports to the polygon sides. For example, the equivalent circuit for a 4-port device is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Transformers are used to normalize the susceptances contained in the kernel. The electrical parameters are ten as the ten scattering coefficients, because the S-matrix is symmetric, and they can be easily evaluated as described in [12]. This equivalent circuit is able to also include the presence of evanescent modes [13,14], and it has been applied to some microwave discontinuities, as inductive/capacitive irises, bends and T-junctions [15].…”

Section: Introductionmentioning

confidence: 99%

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Identification of Equivalent Circuit Based on Polygon Network for Nonreciprocal Lossy N-Port Device

Zappelli¹

2017

PIER B

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Abstract-In this paper, a technique to identify/synthesize an equivalent circuit of nonreciprocal lossy N -port device is presented. The technique joins the classical procedure discussed in the '60s to the polygon network recently proposed in the literature, which permits to draw an equivalent circuit for reciprocal lossless N -port device in a very simple way. The identification is applied to two microwave devices, a reciprocal lossy iris in WR90 waveguide and a 3-port nonreciprocal lossy circulator. The proposed equivalent circuit could give some information about the agreement of the manufactured device and its design, which usually is developed in the hypothesis of ideal lossless components.

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“…Equations (15)- (17) replace the condition on the S-matrix (or Z-matrix) discussed in [12] for the reciprocal case.…”

Section: Non Reciprocal Lossless Devicementioning

confidence: 99%

Section: Non Reciprocal Lossless Devicementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Identification of Equivalent Circuit Based on Polygon Network for Nonreciprocal Lossy N-Port Device

Zappelli¹

2017

PIER B

Self Cite

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“…In the past, the author has defined some equivalent circuits to represent the presence of evanescent accessible modes and a fast and simple method for the identification of the electrical parameters of the equivalent circuits for waveguide devices [22][23][24][25]. Hence, in the second approach an equivalent circuit will be proposed to reconstruct the N -port S-matrix waveguide device, starting from 2-port VNA measurements, in order to minimize and simplify the evaluation of its N (N + 1)/2 circuit parameters.…”

mentioning

confidence: 99%

Reconstruction of the S-Matrix of N-Port Waveguide Reciprocal Devices From 2-Port Vna Measurements

Zappelli¹

2017

PIER B

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Abstract-Two approaches to reconstruct the S-matrix of N -port waveguide reciprocal devices from 2-port S-matrix measurements are proposed and discussed. The main advantage of the proposed approaches is that measurements are done always at the same two ports, without moving the device. The remaining N -2 ports are loaded with different loads, either matched or short. The first approach, based on a manipulation of the 2-port S-matrices, requires N -2 matched and two other loads, while the second approach, based on the evaluation of an equivalent circuit, requires N -2 short and two other loads. The measurement technique is based on standard loads (short, shift and matched) in the waveguide calibration kit of the 2-port VNA.

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Waveguide divider design based on null of electric field

Zappelli

2021

J Comput Electron

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Nowadays, the design of dividers is based on electromagnetic software that optimizes some geometric parameters to obtain the required performance. The choice of the geometry of the discontinuities contained in the divider and of the optimization initial point is quite critical to satisfy the divider requirements. In the last years, it is quite rare to find in the literature a theoretical approach helping the designers in the choice of the divider geometry. Helpful suggestion can derive by the analysis of the electric field in a trial divider that satisfies power division among the output ports in a thin band. In fact, the electric field null can be filled with metallic septa that ensure the same behavior at any frequency. The optimization of the septa position/form with numerical electromagnetic software permits to obtain divider with large bandwidth. A further analysis of the electric field null in the divider permits to add lateral metallic septa that further enlarge the transmission band. Finally, the design of an input matching network increases the transmitted power to the desired value.

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Corrections to “Simple, Fast, and Effective Identification of an Equivalent Circuit of a Waveguide Junction With $N$ Ports” [Jan 15 48-55]

Cited by 3 publications

References 1 publication

Identification of Equivalent Circuit Based on Polygon Network for Nonreciprocal Lossy N-Port Device

Identification of Equivalent Circuit Based on Polygon Network for Nonreciprocal Lossy N-Port Device

Reconstruction of the S-Matrix of N-Port Waveguide Reciprocal Devices From 2-Port Vna Measurements

Waveguide divider design based on null of electric field

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