Microwave receiving device

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, and a polarization filter, and a converter circuit means, connected to the output of said feeder system, for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions, and a further portion of said feeder waveguide is a highpass filter whose cutoff frequency is such that a sufficiently high stopband isolation exists for the oscillator signal of said converter circuit means;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter is included in said means for coupling the energies of the waveguide modes.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, a polarization filter and a converter circuit means, connected to the output of said feeder system, for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions, with said bandpass filter being formed by a plurality of coupling apertures which are disposed in said feeder waveguide and provided with coupling openings in the form of circles;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter is directly integrated in said feeder waveguide.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, a polarization filter and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• the output end of said feeder waveguide is disposed on and normal to the ground plane surface of said microstripline substrate and is electrically connected therewith;
• said input of said microstripline substrate comprises coupling means, disposed on said substrate, for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• said coupling means includes a plurality of coupling pins which extend through said microstripline substrate and axially into said feeder waveguide and which have their base points connected to respective microstriplines disposed on the surface of said substrate opposite said ground plane surface, selected ones of said microstriplines emanating from said base points of said coupling pins being connected together to provide the information from the clockwise and counterclockwise circularly polarized received signal;
• and said polarization converter is directly integrated in said feeder waveguide.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, a polarization filter and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter comprises a dielectric insert provided in said feeder waveguide and having a shape such that the circularly polarized received signals are converted to linearly polarized signals, with said dielectric insert being a cylindrical core inserted into the antenna-side input of said feeder waveguide and with said insert being provided at its peripheral surface with two opposing longitudinally oriented flattened portions whose normals form an angle of 45.degree. with the x axis or the y axis determined by the orthogonal axes where the coupling pins are arranged.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, a polarization filter and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions, and said feeder waveguide is provided with tuning markers formed by a mechanical deformation of the wall of said feeder waveguide and which serve to electrically match the filter parameters and the cross-polarization of the receiver;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter is directly integrated in said feeder waveguide.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, and a polarization filter, and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions, with said bandpass filter being formed by a plurality of coupling apertures which are disposed in said feeder waveguide and provided with coupling openings in the form of circles;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter is included in said means for coupling the energies of the waveguide modes.

In a receiver for counterclockwise and clockwise circulary polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, and a polarization filter, and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane, the improvement wherein:

• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• the output end of said feeder waveguide is disposed on and normal to the ground plane surface of said microstripline substrate and is electrically connected therewith;
• said input of said microstripline substrate comprises coupling means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• said coupling means includes a plurality of coupling pins which extend through said microstripline substrate and axially into said feeder waveguide and which have their base points connected to respective microstriplines disposed on the surface of said substrate opposite said ground plane surface, selected ones of said microstriplines emanating from said base points of said coupling pins being connected together to provide the information from the clockwise and counterclockwise circularly polarized received signal;
• and said polarization converter is included in said means for coupling waveguide modes.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, a polarization filter and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter comprises a dielectric insert provided in said feeder waveguide and having a shape such that the circularly polarized received signals are converted to linearly polarized signals, said dielectric insert being a cylindrical core inserted into the antenna-side input of said feeder waveguide and having a cross section which is reduced in the direction toward the interior of said feeder waveguide.

In a receiver for counterclockwise and clockwise circularly polarized microwave signals comprising a receiving antenna with a feeder system including a feeder waveguide, a polarization converter for converting received circular to linear polarized signals, and a polarization filter, and a converter circuit means, connected to the output of said feeder system for converting the microwave signals of both polarization directions from the high frequency to the intermediate frequency plane;

• the improvement wherein:
• a portion of said feeder waveguide belonging to said feeder system of said receiving antenna is a bandpass filter which is effective for both said polarization directions, and said feeder waveguide is provided with tuning markers formed by a mechanical deformation of the wall of said feeder waveguide and which serve to electrically match the filter parameters and the cross-polarization of the receiver;
• said converter circuit means is disposed on a microstripline substrate whose input is connected with the output of said feeder waveguide;
• said input of said microstripline substrate comprises means disposed on said substrate for coupling the energies of the waveguide modes of both polarization directions out of said feeder waveguide and into said converter circuit means;
• and said polarization converter is included in said means for coupling waveguide modes.