Numerical modelling of chamfered bends and other microstrip junctions of general shape in MMIC

Zheng, Jian Xin; Chang, David C.

doi:10.1109/mwsym.1990.99677

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…For all right-angled bends simulated, for all frequencies, the radiation loss is negligible. These results agree with [3,4], [6].…”

Section: Reflectionsupporting

confidence: 89%

Equivalent length design equations for right-angled microstrip bends

Visser

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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For printed antenna systems, microstrip feeding networks may become quite complex, including several right-angled bends. In designing feed networks we have to consider reflection levels at and electrical lengths of the bends. Removing a part of the area of metallization in the bend's corner can compensate for the excess capacitance and reduce the reflection level of the bend. Full wave simulations have been performed for unmitered and (50%) mitered right-angled bends in microstrip on FR4 and FR4 -like substrates in the frequency range 868MHz -60GHz. The simulations revealed that for reflection levels below -15dB, up to 10GHz mitering is unnecessary. For reflection levels below -20dB, mitering must be applied for frequencies in excess of 2.5GHz. A slight modification of the centreline approach for unmitered bends leads to an equivalent electrical length for unmitered bends with an absolute accuracy of less than one degree for all frequencies and substrates, where the reference planes may be brought back all the way to the bend. Applying this modification to 50%-mitered bends, having the reference planes at 0.2λ g distance from the bend, λ g being the wavelength in the substrate, leads to an absolute error in electrical length of less than two and a half degrees for all frequencies and substrates.

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“…For all right-angled bends simulated, for all frequencies, the radiation loss is negligible. These results agree with [3,4], [6].…”

Section: Reflectionsupporting

confidence: 89%

Equivalent length design equations for right-angled microstrip bends

Visser

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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“…In the past two decades, enormous efforts have been made to characterize the transmission property of the microstrip bends. Among all the analytical technologies, the quasi-static method [1,3], the MoM based on mixed potential integrated equations [4,5], the wave-guide mode (modal matching) method [6,7,8], and the finite-difference time-domain (FDTD) method [9] are the commonly used methods. Most of them fall into transforming their calculating results into simple passive lumped equivalent circuits.…”

Section: Introductionmentioning

confidence: 99%

Generalized non‐uniform transmission‐line models for local radiation from microstrip bends in MMICs

Liu

Zhao

Mei

2003

Int J Numerical Modelling

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SUMMARYAlthough microstrip bends in high-speed digital MMICs have been widely investigated for the past two decades, their local radiation characteristics rather than their reflection characteristics have not been completely explored yet. In this paper, the generalized non-uniform transmission-line equations are used in analysing the microstrip bends including their local radiations. In our new models, the whole structure of a bend is regarded as a non-uniform transmission line that is totally governed by the generalized nonuniform transmission-line equations. Except for analytical simplification and broad bandwidth performance, the new analysis could indicate where the strongly local radiations along a bend structure come from.

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“…electromagnetic waves to interface with the microstrip line and causes a loss of power in the transmission line of the Butler matrix network. In comparison, the right-angled bend provides negligible radiation loss, so that it can be used in Butler matrix systems[14] [15].…”

mentioning

confidence: 99%

Analysis and Design of Different Methods to Reach Optimum Power in Butler Matrix

Kiehbadroudinezhad¹,

Bousquet²,

Čada³

et al. 2019

IJCNS

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With the increasing demand for high speed reliable communications, smart antennas, such as the Butler Matrix array, can be used to develop a system that increases the performance of a wireless system. The Butler matrix is a switched beam array system which can produce orthogonal uniform beams. The main objective is to improve the efficiency of the power in a 90-degree bend. Also, the double-mitered bend is particularly interesting since it provides a substantially lower reflection coefficient and a lower value of S 12 at a frequency of 2.4 GHz compared to an unmitered one. Therefore, this paper describes an optimum design using a double-mitered method with a 2 × 2 and a 4 × 4 Butler Matrix array, operating at 2.4 GHz which is used in wireless systems with an FR4 substrate.

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Numerical modelling of chamfered bends and other microstrip junctions of general shape in MMIC

Cited by 13 publications

References 2 publications

Equivalent length design equations for right-angled microstrip bends

Equivalent length design equations for right-angled microstrip bends

Generalized non‐uniform transmission‐line models for local radiation from microstrip bends in MMICs

Analysis and Design of Different Methods to Reach Optimum Power in Butler Matrix

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