Topic
Stub (electronics)
About: Stub (electronics) is a research topic. Over the lifetime, 8172 publications have been published within this topic receiving 75018 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a shorted waveguide-stub coupling mechanism is presented for implementing narrow-band multimode coupled cavity filters without coupling screws, which is well suited to analysis and design with the efficient and accurate mode-matching method.
Abstract: A shorted waveguide-stub coupling mechanism is presented for implementing narrow-band multimode coupled cavity filters without coupling screws. The coupling element is a shorted rectangular waveguide stub placed in the end walls of cylindrical filter cavities, using perturbation of the magnetic fields to obtain coupling between degenerate modes. This structure is well suited to analysis and design with the efficient and accurate mode-matching method. Coupling coefficients and resonator frequencies can be controlled by varying cavity dimensions and the length, width, and depth of the rectangular coupling element. The accuracy with which the coupling can be realized and the elimination of coupling screws reduce the amount of tuning substantially. A third-order Chebyshev filter, realized in a triple-mode cavity with no coupling screws and only two tuning screws, is presented to verify the use of the coupling structure.
21 citations
TL;DR: In this article, a plasmonic refractive index sensor based on a metal-insulator-metal waveguide coupled with a double concentric square ring resonator is proposed and analyzed both theoretically and numerically.
Abstract: A plasmonic refractive index sensor based on a metal-insulator-metal waveguide coupled with a double concentric square ring resonator is proposed and analyzed both theoretically and numerically. The theoretical and the numerical results are based on the transmission-line model and the finite difference time domain method, respectively. The theoretical results agree well with the numerical ones. A maximum sensitivity of 1250 nm per refractive index unit with a high figure of merit of 32.8 for the double concentric square ring resonator with one stub is obtained in the near-infrared region. Also, the double concentric square ring resonator with three stubs is simulated, and has a maximum sensitivity of 1270 nm per refractive index unit with a high figure of merit of 58. Our proposed plasmonic structures could find useful applications in sensing systems and integrated circuits in the near-infrared region.
21 citations
14 May 2007
TL;DR: In this article, two types of external matching networks for tri-band operation are proposed, one consisting of a two-section impedance transformer and a shunt stub; the other two series stubs and an impedance transformer.
Abstract: This paper presents design methods of 3-dB branch- line couplers operating at two arbitrary frequencies and the centre of them. After a brief survey of the equivalent admittance approach, two types of external matching networks for tri-band operation are proposed. One consists of a two-section impedance transformer and a shunt stub; the other two series stubs and an impedance transformer. Then, two tri-band/broadband couplers are designed using these matching networks; the former is constructed in microstrip line and the latter in CPW. The design techniques are verified by em-simulations and experiments.
21 citations
18 Jun 1995
TL;DR: In this article, the design and analysis of a reflect array utilizing a stub loaded microstrip element is discussed, which not only provides a theoretical framework for the design of microstrip reflect arrays in general, but also permits the prediction of reflect array performance over extended bandwidths.
Abstract: Because of fabrication simplicity, design robustness, and planar form factor, a microstrip reflect array provides an attractive alternative to the common parabolic reflector. This paper discusses the design and analysis of a reflect array utilizing a stub loaded microstrip element as shown. The analytical technique discussed not only provides a theoretical framework for the design of microstrip reflect arrays in general, but also permits the prediction of reflect array performance over extended bandwidths.
21 citations
TL;DR: In this paper, the stubs are attached to the cavity side edges and they are coupled with the magnetic fields of the cavity, allowing the stub loaded cavity to operate below its fundamental resonant frequency.
Abstract: This article reports on a simple yet efficient miniaturization technique of substrate integrated waveguide cavity resonators through stub loading. The stubs are attached to the cavity side edges and they are coupled with the magnetic fields of the cavity. This setup allows the stub loaded cavity to operate below its fundamental resonant frequency. This miniaturization technique is demonstrated by developing a two pole filter in horizontally and vertically coupled configurations. The potential to incorporate electronic tuning and various possible applications of these miniaturized cavities in low frequency system-in-package designs make them an excellent choice as compared to their conventional counterparts.
21 citations