Showing papers on "Return loss published in 1976"
Patent•
01 Nov 1976
TL;DR: In this article, the output voltages produced by two directional couplers are applied to analog circuitry for generating a voltage that is directly proportional to return loss, and an analog meter scale is calibrated to indicate return loss in decibel units and/or voltage standing wave ratio (VSWR) directly.
Abstract: The output voltages produced by two directional couplers are applied to analog circuitry for generating a voltage that is directly proportional to return loss. An analog meter scale is calibrated to indicate return loss in decibel units and/or voltage standing wave ratio (VSWR) directly.
26 citations
TL;DR: A computer-operated millimeter-wave measurement system that performs automated insertion-loss and return-loss measurements on a stepped, discrete frequency basis, and covers the frequency range 40 to 110 GHz is described.
Abstract: A computer-operated millimeter-wave measurement system is described. The set performs automated insertion-loss and return-loss measurements on a stepped, discrete frequency basis, and covers the frequency range 40 to 110 GHz. Some notable features of the system are: a computer-controlled signal source of a BWO, extensive error reduction through real-time computer processing, and use of a harmonic comb mixer as a source of precisely known millimeter-wave reference frequencies. Measurement principles and performance features of the system are presented.
5 citations
01 Sep 1976
TL;DR: In this paper, a step-impeded phase shifter with a return loss better than 30 db across an octave bandwidth was proposed. But the phase shifters were not tested on MIC's in the frequency range 4 to 8 GHz and X-band.
Abstract: Meanderline phase shifters in microstrip are badly matched (vswr ? 2), due to the difference in phase velocity of the odd and even mode of the coupled transmission lines. This is overcome by a stepped impedance design, allowing to realize e.g. a 90° phase shifter with a return loss better than 30 db across an octave bandwidth. Straightforward design equations are derived and confirmed by measurements on MIC's in the frequency range 4 to 8 GHz and X-band.
3 citations
TL;DR: In this paper, a class of transmission-line networks is exhibited, which consist of alternate quarter-wave line sections and short-circuited stubs terminated in a stub in parallel with a conductance, and the reflection coefficients of these optimum networks are equiripple and have the maximum number of zeros in the design band consistent with their length.
Abstract: A class of transmission-line networks is exhibited, which consist of alternate quarter-wave line sections and short-circuited stubs terminated in a stub in parallel with a conductance, which are optimum in the sense that no other network of the same form, with the same termination, can have a lower bound on its reflection coefficient in the design band. The reflection coefficients of these optimum networks are equiripple and have the maximum number of zeros in the design band consistent with their length.