Topic
Stub (electronics)
About: Stub (electronics) is a research topic. Over the lifetime, 8172 publications have been published within this topic receiving 75018 citations.
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Patent•
30 Jun 2000TL;DR: In this paper, a broadband plate antenna with a ground conductor and a radiating element separated from the ground conductor is described, which includes an impedance matching stub ( 404 ) electrically coupled to the radiating elements.
Abstract: A broadband plate antenna ( 402 ) is disclosed, which includes a ground conductor ( 407 ) and a radiating element ( 406 ) which is separated from the ground conductor ( 407 ). The antenna also includes an impedance matching stub ( 404 ) electrically coupled to the radiating element ( 406 ), and means for feeding the radiating element ( 406 ), wherein the means for feeding includes a feed point ( 410 ) disposed on the impedance matching stub ( 404 ).
31 citations
TL;DR: In this article, a microstrip slot loop antenna with a three-stub hybrid coupler feed network was proposed for generating broadband circular polarisation, achieving a very broad bandwidth of 55.6% at 2:1 VSWR and 22.2% bandwidth for < 3 dB axial ratio.
Abstract: A microstrip slot loop antenna with a three-stub hybrid coupler feed network is proposed for generating broadband circular polarisation. A very broad bandwidth of 55.6% at 2:1 VSWR and 22.2% bandwidth for < 3 dB axial ratio was achieved.
31 citations
Patent•
07 Apr 1986
TL;DR: In this paper, the authors used a microstrip combiner to combine up to five input signals for application to a common antenna with a common RF filter (100) coupled to a small circuit board (300) consisting of five transmission lines and a short-circuited tuning transmission line.
Abstract: Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300). The microstrip combiner (300) includes a circuit board (310) having five transmission lines (601-605) and a short-circuited tuning transmission line (610), all coupled to a junction (620). The microstrip combiner (300) is tuned by means a variable impedance produced by varying the position of a dielectric tuning plate (630) with respect to a the tuning transmission line (610).
31 citations
TL;DR: In this paper, a novel aperture-coupled circularly polarized microstrip antenna with a three-stub hybrid coupler feed circuit was proposed to generate broadband circular polarization radiation.
Abstract: A novel aperture-coupled circularly polarized microstrip antenna with a three-stub hybrid coupler feed circuit in order to generate broadband circular polarization radiation is proposed. The bandwidth is 32.3% for 2:1 VSWR and 42.6% for 3-dB axial ratio. The achievable maximum gain is 8.8 dBic. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 38–41, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11280
31 citations
TL;DR: Three compact printed quasi-Yagi antennas are designed with the same antenna prototype but different parameter values, which have good unidirectional radiations, high radiation efficiencies, and low cross-polarization levels at the operating frequencies within the impedance bandwidths.
Abstract: Double dipoles on a single-layer substrate are utilized to construct a triple-mode printed quasi-Yagi antenna for the multi-band and broadband antenna applications. A stub-loaded dipole generating two resonant modes (i.e., lower dual-mode dipole) is allocated on the underside of a simple dipole (i.e., upper single-mode dipole) introducing the third resonant mode. Using these three resonant modes, three compact printed quasi-Yagi antennas, i.e., tri-band, dual-band, and broadband printed quasi-Yagi antennas, are designed with the same antenna prototype but different parameter values. Seen from the measured results, all of these three antennas have good unidirectional radiations, high radiation efficiencies, and low cross-polarization levels at the operating frequencies within the impedance bandwidths.
31 citations