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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
More filters
Proceedings ArticleDOI
07 Jun 2009
TL;DR: In this paper, a 60 GHz reflectarray with a single p-i-n diode was investigated. And the reflection phase was changed by 180° in accordance with the on/off state of the diode, which works as a single-bit phase shifter.
Abstract: A 60-GHz band electrically reconfigurable reflectarray has been investigated. Each reflecting element is printed on a dielectric substrate and has a rectangular microstrip patch and a stub loaded with a single p-i-n diode. The reflection phase is changed by 180° in accordance with the on/off state of the p-i-n diode; namely, the stub works as a single-bit phase shifter. A prototype consisting of 40 × 40 elements spaced at 0.7λ was fabricated, and the reflection coefficients of the elements and the radiation patterns while the beam steering was performed were measured. Good agreement was observed between the results of the simulations and experiments.

72 citations

Journal ArticleDOI
TL;DR: This work is partially supported by the Innovation Programme under grant agreement H2020-MSCA-ITN-2016SECRET-722424 and the financialsupport from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E022936/1.
Abstract: The paper presents a technique to enhance the isolation between adjacent radiating elements which is common in densely packed antenna arrays. Such antennas provide frequency beam-scanning capability needed in Multiple-Input Multiple-Output (MIMO) systems and Synthetic Aperture Radars (SARs). The method proposed here uses a metamaterial decoupling slab (MTM-DS), which is located between radiating elements, to suppress mutual-coupling between the elements that would otherwise degrade the antenna efficiency and performance in both the transmit and receive mode. The proposed MTM-DS consists of mirror imaged E-shaped slits engraved on a microstrip patch with inductive stub. Measured results confirm over 9–11 GHz with no MTM-DS the average isolation (S12) is -27 dB; however, with MTM-DS the average isolation improves to -38 dB. With this technique the separation between the radiating element can be reduced to 0.66λo, where λ0 is free space wavelength at 10 GHz. In addition, with this technique there is 15% improvement in operating bandwidth. At frequencies of high impedance match of 9.95 GHz and 10.63 GHz the gain is 4.52 dBi and 5.40 dBi, respectively. Furthermore, the technique eliminates poor front-to-back ratio encountered in other decoupling methods. MTM-DS is also relatively simple to implement. Assuming adequate space is available between adjacent radiators the MTM-DS can be fixed retrospectively on existing antenna arrays, which makes the proposed method versatile.

71 citations

Journal ArticleDOI
Chi-Feng Chen1
TL;DR: In this paper, a simple and efficient method has been presented to design multi-band microstrip bandpass filters (BPFs) without a significant increase in circuit size, which can be used to implement a third order BPF with a transmission zero at the upper side of the passband when these resonant frequencies are suitably assigned.
Abstract: A simple and efficient method has been presented to design multi-band microstrip bandpass filters (BPFs) without a significant increase in circuit size. By utilizing multiple coupling paths, all passbands can then be fully controlled and, thus, the design is flexible so as to independently realize different bands. In addition, by adjusting the structural parameters of the proposed trimode stub-load stepped-impedance resonator, its first three resonant frequencies can be controlled. Thus, it can be utilized to implement a third-order BPF with a transmission zero at the upper side of the passband when these resonant frequencies are suitably assigned. For our demonstration, a compact quint-band BPF formed by only five tri-mode resonators has been designed and fabricated. It is shown that the quint-band filter occupies an extremely small area, i.e., 0.34 λ0 by 0.03 λ0 (0.52 λgby 0.045 λg). Good agreement is also achieved between simulation and measurement.

71 citations

Journal ArticleDOI
TL;DR: In this article, a method to eliminate bandwidth-limiting impedance anomalies or resonances in single-and dual-polarized tapered slot phased arrays is presented, where the resonances are effectively suppressed by introducing plated through vias in the element.
Abstract: A method to eliminate bandwidth-limiting impedance anomalies or resonances in stripline-fed single- and dual-polarized tapered slot phased arrays is presented. For dual-polarized arrays, others have shown that the resonance with the lowest frequency is related to a cavity constituted by the dielectric region of the tapered slot element. Simulations have been performed to test if this cavity model also predicts the remaining resonances. It was found that the cavity model predicts some but not all of the resonances. However, it was found that all resonances in both single- and dual-polarized arrays have some dependence on the dielectric region. The resonances are effectively suppressed by introducing plated through vias in the element. The vias are positioned along the edges of the slotline, slotline cavity, stripline, and stripline stub. The analysis is performed with the finite-difference time-domain method by considering a unit cell in an infinite array.

71 citations

Journal ArticleDOI
TL;DR: In this paper, a radial stub loaded resonator (RSLR) is proposed to control two tunable transmission zeros separately and on the other hand, has the ability to provide a notched band.
Abstract: In this letter, a novel compact ultra-wideband (UWB) microstrip bandpass filter (BPF) with a notched band is presented by using the proposed radial stub loaded resonator (RSLR). The RSLR, on the one hand, is able to control two tunable transmission zeros separately and on the other hand, has the ability to provide a notched band. In addition, the vertical dimension of the UWB BPF can be significantly reduced by using RSLR, as compared with the UWB BPF based on the conventional stub-loaded resonator (SISLR). For validation, two UWB BPFs, one without the notched band and the other with a notched band at 8.0 GHz for rejecting satellite-communication signal, are developed and fabricated. Measured results show two fabricated filters have the merits of low insertion losses, sharp rejections and flat group delays. Moreover, two filters exhibit the simple topologies and compact sizes.

71 citations


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