Abstract: This document describes radiation channels filled with a dielectric using a surface with a pattern of radiation elements to allow electromagnetic energy to enter or escape the dielectric. An absorption channel is paired with the radiation channel. The absorption channel is loaded with an absorber material to allow for a transfer of electromagnetic energy between the radiation channels and the respective absorption channel. A surface of each of the absorption channels has a pattern of absorbing elements that allows the electromagnetic energy that enters or exits the dielectric to be absorbed by the absorber material.

Abstract: A multi-mode radar system with high isolation between modes is described herein. The radar system comprises a feed portion configured to propagate electromagnetic energy along an energy path. Connected to the feed portion is a divider portion that splits the energy path into a first energy path corresponding to first antennas and a second energy path corresponding to second antennas. The second antennas have one or more of: different operating frequencies, different polarizations, or different fields of view than the first antennas. By using respective filters in the first and second antenna portions, the radar system achieves multi-mode use (e.g., muti-frequency, multi-polarization, and/or multi-field-of-view) with high isolation between the modes. Furthermore, using a single feed port may save cost, have lower complexity, and allow for better space utilization.

Abstract: The present application relates to a radar system comprises a first antenna, an additional antenna, a feed port, an additional feed port, a guiding section and an additional guiding section. The first antenna is coupled to the feed port via the guiding section and the additional antenna is coupled to the additional feed port via the additional guiding section. A radar circuit is configured to operate the first antenna independently from the additional antenna in a separated operation mode and to operate at least one antenna coupled to the feed port together with at least one antenna coupled to the additional feed port as parts of a single common antenna in a combined operation mode.

Abstract: A transmission line network for a radar antenna system comprises a guiding section, a port and a filter section coupled between the guiding section and the port. The guiding section is configured to guide electromagnetic energy having a first frequency and to guide electromagnetic energy having a second frequency. A transverse width of the filter section is smaller than a transverse width of the guiding section and the transverse width of the filter section is adapted to block electromagnetic energy having the first frequency and to pass electromagnetic energy having the second frequency. The filter section is configured as a stepped impedance filter.

Abstract: A radar antenna system comprises a first antenna, an additional first antenna, a second antenna, a guiding section, a branching section, an additional branching section, a filter section and an additional filter section. The branching section and the additional branching section are coupled in series in between the guiding section and the first antenna. The branching section couples the filter section to the guiding section and the additional branching section couples the additional filter section to the guiding section. The guiding section guides energy at a first, second and further frequency. The filter section couples the guiding section to the second antenna, blocks energy at the first frequency and passes energy at the second frequency. The additional filter section couples the guiding section to the second antenna or to a termination, blocks energy at the first frequency and passes energy at the further frequency.

Abstract: This document describes waveguides that use a combination of air dielectric filled channels and non-air dielectric filled channels to obtain beneficial attributes of both air and dielectric waveguides. EM energy loss inside the waveguide compares to a traditional air waveguide. However, with a smaller size than a comparable air waveguide, the example waveguide can occupy less area of a chip or package than a comparable air waveguide of a traditional design. The waveguide has a routing portion with hollow channels filled with an air dielectric. Radiation channels corresponding to each of the hollow channels are loaded with a non-air dielectric. A surface of each of the radiation channels allows EM energy to escape the non-air dielectric. The described waveguide may be particularly advantageous for use in an automotive context, for example, detecting objects in a roadway in a travel path of a vehicle.

Abstract: A radar system for a vehicle includes: at least one main transmit antenna configured to transmit main radar waves essentially parallel to a road on which the vehicle is standing or driving; at least one main receive antenna configured to receive reflections of the main radar waves off objects on the road; a first street condition monitoring, SCM, transmit antenna configured to transmit first polarized radar waves essentially directed to the road at a first polarization; a second SCM transmit antenna configured to transmit second polarized radar waves essentially directed to the road at a second polarization different from the first polarization; a first SCM receive antenna configured to receive, at the first polarization, reflections of the polarized radar waves off the road; and a second SCM receive antenna configured to receive, at the second polarization, reflections of the polarized radar waves off the road.

Abstract: A radar system for a vehicle includes: a processing device having multiple transmit outputs and multiple receive inputs; a main transmit antenna to transmit main radar waves essentially parallel to a road, and coupled to the processing device via a first transmit output; a main receive antenna to receive reflections of the main radar waves off objects, and coupled via a first receive input; a first street condition monitoring (SCM) transmit antenna to transmit first polarized radar waves essentially directed to the road at a first polarization, and coupled via a second transmit output; and a first SCM receive antenna to receive, at the first polarization, reflections of the polarized radar waves off the road, and coupled via a second receive input. The system can include second SCM transmit and receive antennas coupled via a third transmit output and a third receive input and operating at a second polarization.

Abstract: This document describes waveguides that use a combination of air dielectric filled channels and non-air dielectric filled channels to obtain beneficial attributes of both air and dielectric waveguides. EM energy loss inside the waveguide compares to a traditional air waveguide. However, with a smaller size than a comparable air waveguide, the example waveguide can occupy less area of a chip or package than a comparable air waveguide of a traditional design. The waveguide has a routing portion with hollow channels filled with an air dielectric. Radiation channels corresponding to each of the hollow channels are loaded with a non-air dielectric. A surface of each of the radiation channels allows EM energy to escape the non-air dielectric. The described waveguide may be particularly advantageous for use in an automotive context, for example, detecting objects in a roadway in a travel path of a vehicle.