Near field resolution measurements with the leaky wave antennas
conference paper
N-path filters exploiting switched-series-R-C networks can realize high-Q blocking-tolerant band-pass filters. Moreover, their center frequency is flexibly programmable by
a digital clock. Unfortunately, the time variant nature of these circuits also results in unwanted signal folding. This paper proves analytically that folding can be reduced and band pass filtering can be improved by adding an inductance in series with the switched-R-C network. In contrast, a shunt capacitor degrades band-pass filter performance. The interaction between the reactive series impedance and the switched capacitors of an N-path filter complicates analysis due to memory effects associated with reactive components. Assuming N identical signal paths with 1/N duty cycle, we show it is possible to solve the set of differential equations, by assuming that the signals in each path only differ in
delay. Analytical equations are verified versus simulations, and the benefits in filter properties and reduction in signal folding are demonstrated.
a digital clock. Unfortunately, the time variant nature of these circuits also results in unwanted signal folding. This paper proves analytically that folding can be reduced and band pass filtering can be improved by adding an inductance in series with the switched-R-C network. In contrast, a shunt capacitor degrades band-pass filter performance. The interaction between the reactive series impedance and the switched capacitors of an N-path filter complicates analysis due to memory effects associated with reactive components. Assuming N identical signal paths with 1/N duty cycle, we show it is possible to solve the set of differential equations, by assuming that the signals in each path only differ in
delay. Analytical equations are verified versus simulations, and the benefits in filter properties and reduction in signal folding are demonstrated.
Topics
Azimuthal resolutionGround Penetrating RadarLeaky wave slotRayleigh resolutionAntennasEconomic and social effectsFrequency bandsGeological surveysGround penetrating radar systemsRadarRadar antennasGround Penetrating RadarLaboratory measurementsLeaky wave antennasLeaky wavesOperational bandwidthRayleighUltra wide-band antennasWide frequency bandsTraveling wave antennas
TNO Identifier
780719
ISBN
9781509054848
Publisher
Institute of Electrical and Electronics Engineers Inc.
Article nr.
7996086
Source title
9th International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2017. 28 June 2017 through 30 June 2017
Editor(s)
Giannopoulos A.
Warren C.
Warren C.
Files
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