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Stub (electronics)

About: Stub (electronics) is a research topic. Over the lifetime, 8172 publications have been published within this topic receiving 75018 citations.


Papers
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Patent
Hideo Sugawara1
14 Feb 1990
TL;DR: In this article, a printed circuit board and a plane antenna are unified such that the second surface of the printed board and the other surface of a dielectric substrate are opposed to each other and the coupling stub is placed in position to be coupled to the plane antenna element.
Abstract: An electronic circuit device comprises a printed circuit board (3) having a first surface on which a circuit pattern (6) is formed on which components (7) are mounted and a second surface on which a ground plane (5) is formed, a coupling stub (15) being formed in part of the circuit pattern; and a plane antenna having an antenna element (1), formed on one surface of a dielectric substrate (2) The printed circuit board (3) and the plane antenna are unified such that the second surface of the printed circuit board (3) and the other surface of the dielectric substrate (2) are opposed to each other and the coupling stub (15) is placed in position to be coupled to the antenna element (1)

75 citations

Journal ArticleDOI
TL;DR: The proposed MIMO/diversity antenna can be a good candidate for portable UWB applications and when installed on a printed circuit board with a standard size, with USB connector, and device housing and various other types of housing show good performance.
Abstract: This paper presents a bandwidth enhanced, compact, multiple-input–multiple-output (MIMO) antenna with high isolation for modern wireless ultrawideband (UWB) applications. The proposed antenna consists of two simple eye-shaped slot radiators, and in order to enhance isolation, the proposed antenna uses a rectangular-shaped ground plane with an extruded T-shaped stub. The antenna characteristics such as the S-parameters, realized gain, surface current distributions, and radiation patterns are investigated. Furthermore, the diversity performance of MIMO antenna in terms of envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and multiplexing efficiency is also studied. The designed antenna shows the impedance bandwidth of 17.2 GHz (from 2.8 to 20 GHz) with a compact size of $18\times 36$ mm2. The antenna possesses a low mutual coupling of less than −20 dB over the operating band, the ECC and the DG are less than 0.02 and greater than 9.95 dB, respectively. The prototype is fabricated and tested for impedance and radiation characteristics. The proposed antenna when installed on a printed circuit board with a standard size, with USB connector, and device housing and various other types of housing show good performance. The proposed MIMO/diversity antenna can be a good candidate for portable UWB applications.

75 citations

Journal ArticleDOI
TL;DR: In this paper, a practical design equation of the ultimate bearing capacity of hexagonal CFT stub columns was proposed based on the superposition principle, with an average ratio of predicted to measured capacity of 1.08 and a standard deviation of 0.05.
Abstract: Four groups of axial compression tests on hexagonal CFT stub columns have been carried out aiming to investigate the effects of the concrete strength and steel ratio on the behaviour of hexagonal CFT stub columns. Studies on parametric analysis and composite action between core concrete and steel tube have been carried out using FE modelling which had been benchmarked using the test data. Based on the essential data obtained in this paper, the ratio of axial stress-yield strength of steel tube was determined at the ultimate state. The stress contour of core concrete was simplified to an unconfined area without constraint and a confined area with uniform constraint imposed by hexagonal steel tube. Eventually, a practical design equation of the ultimate bearing capacity of hexagonal CFT stub columns was proposed based on the superposition principle. An excellent agreement between the proposed equation and the experimental results was observed, with an average ratio of predicted to measured capacity of 1.08 and a standard deviation of 0.05.

74 citations

Journal ArticleDOI
TL;DR: The performances of the proposed antenna by the simulation and experimentation equally designated it a blameless candidate for the UWB applications.
Abstract: In this communication, a compact two-element ultra-wideband (UWB) wearable multiple-input multiple-output (MIMO) antenna with high port isolation is presented. The proposed structure is composed of jeans material in which an `8' shaped stub is placed on the middle position of the antenna backside and connected to the partially suppressed ground structure to improve the port isolation characteristics. The antenna covers the frequency range from 2.74 to 12.33 GHz (about 127.27%) with the port isolation of >26 dB over the entire UWB frequency range. The envelope correlation co-efficient is found to be 9.9) throughout the complete operating band. The channel capacity loss for the proposed MIMO antenna is <;0.13 bit/s/Hz. The imprinted optimised UWB MIMO antenna covers the area size of 55 × 35 mm 2 . The performances of the proposed antenna by the simulation and experimentation equally designated it a blameless candidate for the UWB applications.

74 citations

Journal ArticleDOI
TL;DR: In this article, a single-polarized filtering dielectric resonator antenna (DRA) with high selectivity is investigated, where the DRA is fed by hybrid microstrip line/conformal strip, excited in its fundamental TE$1\delta 1}^{y} $ mode.
Abstract: A compact single-polarized filtering dielectric resonator (DR) antenna (DRA) with high selectivity is investigated. The DRA is fed by hybrid microstrip line/conformal strip, excited in its fundamental TE $_{1\delta 1}^{y} $ mode. Owing to different loading effects of the microstrip stub and conformal strip, the resonance frequency of TE $_{1\delta 1}^{y}$ mode excited by the two feed lines is slightly different. Such stepping resonances yield a wide bandwidth of 21.9% and a very flat gain of 5.1 dBi. The hybrid-feeding scheme also establishes a cross-coupled structure in the DRA, which introduces two radiation nulls right near the band edges. A compact wideband filtering DRA (FDRA) with quasi-elliptic bandpass response is, therefore, obtained without requiring any specific filtering circuit. This single-polarized design is also modified to realize a dual-polarized FDRA by adding another orthogonal port with the same feeding scheme. To reduce mutual coupling between the two ports, the microstrip stubs are folded to L shape, and four additional metal posts are inserted into the DR. As a result, the isolation is improved by 14 dB, from 7.2 to 21.2 dB.

73 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023205
2022471
2021294
2020397
2019433
2018472