Patent
Means for matching impedances between a helical resonator and a circuit connected thereto
TLDR
In this paper, a microstrip transmission line is constructed with a printed circuit board, the microstrip stub being short in comparison to the wavelength at the resonant frequency of the filter and assuming the characteristics of an inductive impedance.Abstract:
Impedance matching between a helical resonator of a helical resonator filter and a circuit connected thereto is accomplished by the provision of a microstrip transmission line including a microstrip stub printed on a printed circuit board, the microstrip stub being short in comparison to the wavelength at the resonant frequency of the filter whereby the microstrip stub assumes the characteristics of an inductive impedance. A first electrical end of the microstrip stub is connected to a first terminal of the helical resonator and to a first terminal of the circuit, and a second electrical end of the microstrip stub is connected to a second terminal of the helical resonator and to a second terminal of the circuit.read more
Citations
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Panu Hagström,Jari Pelkonen +1 more
TL;DR: In this article, a radio frequency filter (400, 500, 600) comprises a base plate (401, 603) and an electrically conductive ground plane in connection with it, a predetermined number of inner conductors (403A-403G, 501, 502, 601) attached substantially perpendicularly to the base plate which have a first end and second end.
References
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Patent
Apparatus for broad-band radio transmission
TL;DR: In this article, a stub-supported two-conductor line adapted to transfer energy at a range of frequencies without the occurrence of reflections or standing-stands is described. But this line is not suitable for high-frequency oscillatory electric energy.
Patent
Helical resonator having variable capacitor which includes windings of reduced diameter as one plate thereof
TL;DR: A helical resonator is comprised of a coil embedded in a plastic core which has been injection molded thereabout and a conductive housing as discussed by the authors, which is partially formed by a wall of the housing which is adjacent to the windings of reduced diameter.
Patent
High frequency transmission system
TL;DR: In this article, the authors proposed a method and means for preventing wave reflection in high frequency transmission systems, where wave reflection which produces line losses and undesired radiation is usually suppressed, in the...