Compressive receiver
First Claim
1. A compressive receiver comprising:
- A. a surface-electromagnetic-wave-guide that includes an input port, an output port, and a dielectric body through which electromagnetic radiation propagates in traveling from the input port to the output port, the dielectric body being dispersive throughout a delay-line frequency band with a substantially linear relationship to frequency of the time required for an electromagnetic wave to propagate through the waveguide; and
B. means for repeatedly chirp-translating the frequency components of an input signal within a predetermined input frequency range to produce a chirp signal and for applying the chirp signal to the input port, the chirp rate of the chirp translation being so related to the relationship of delay to frequency as to cause the chirp-signal component that results from a narrow-band component in the input signal to be time-compressed in propagating from the input port to the output port.
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Accused Products
Abstract
An electromagnetic dispersive delay line (10) includes a dielectric strip (28) as well as a coupler (24, 34, 36, and 38) for launching surface electromagnetic waves into the dielectric strip. The upper surface of the dielectric strip (28) is left exposed to the air in order to provide an interface with a lower-permittivity medium of propagation. This permits a surface-electromagnetic-wave propagation mode. The thickness of the dielectric strip (28) is varied along its length so as to result in a linear relationship of delay to frequency throughout a predetermined frequency range. Preferably, a conductive strip (26) spaced from the dielectric strip extends along the surface-wave propagation path in the region occupied by the evanescent field external to the dielectric strip (28). This conductive strip (26) modifies the phase relationships between the electric and magnetic fields in the evanescent-field region so as to cause some of the power transmission to occur outside of the dielectric strip. This modifies the dispersion curve so as to extend the bandwidth of significant dispersion.
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Citations
5 Claims
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1. A compressive receiver comprising:
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A. a surface-electromagnetic-wave-guide that includes an input port, an output port, and a dielectric body through which electromagnetic radiation propagates in traveling from the input port to the output port, the dielectric body being dispersive throughout a delay-line frequency band with a substantially linear relationship to frequency of the time required for an electromagnetic wave to propagate through the waveguide; and B. means for repeatedly chirp-translating the frequency components of an input signal within a predetermined input frequency range to produce a chirp signal and for applying the chirp signal to the input port, the chirp rate of the chirp translation being so related to the relationship of delay to frequency as to cause the chirp-signal component that results from a narrow-band component in the input signal to be time-compressed in propagating from the input port to the output port. - View Dependent Claims (2, 3, 4, 5)
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Specification