Low noise block down-converter for direct broadcast satellite receiver integrated with a flat plate antenna

• US 5,125,109 A
• Filed: 06/23/1988
• Issued: 06/23/1992
• Est. Priority Date: 06/23/1988
• Status: Expired due to Fees

• Current Assignee: COMSAT Corporation (Reorganized ISA SA)
• Original Assignee: COMSAT Corporation (Reorganized ISA SA)
• Inventors: Zaghloul, Amir I., Geller, Bernard D.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Charouel, Lisa
• Application Number:
  US07/210,433
• Time in Patent Office: 1,461 Days
• Field of Search: 343/700 MS, 455/323, 455/325, 455/327, 455/328, 455/313, 455/205, 455/317
• US Class Current: 455/313
• CPC Class Codes: H03D 9/0641 located in a hollow waveguide

Abstract

A compact multi-layer flat antenna structure incorporating a low noise block down-converter on the power divider network layer of the antenna. RF circuit losses are reduced, and the antenna/receiver combination is made more compact, for flush mounting. The antenna/receiver combination finds particular utility in direct broadcast satellite (DBS) applications for single or dual orthogonal polarizations. The connection between the antenna and receiver may be implemented in stripline/coplanar waveguide, or other known technologies such as microstrip, slotline, and finline.

Claims

1. A flat plate direct broadcase satellite (DBS) antenna/receiver combination, comprising:

a ground plane;

a power dividing network layer disposed over said ground plane and capacitively coupled thereto;

a radiating element array disposed over said power divider network layer, and capacitively coupled thereto, said radiating element array comprising a plurality of radiating elements, ones of said radiating elements within said radiating element array being fed at at least a single point by corresponding elements of said power divider network; and

a low noise block down-converter, disposed on a substrate and provided on said power divider network layer.

2. The combination recited in claim 1, wherein said low noise block down-converter comprises:

first and second low noise amplifiers, an output of said first amplifier being connected to an input of said second amplifier;

a band pass filter receiving an output of said second amplifier;

a local oscillator;

a mixer receiving outputs of said band pass filter and said local oscillator;

a low pass filter connected to an output of said mixer;

an IF amplifier connected to an output of said low pass filter;

wherein said first amplifier receives an output of said antenna.

3. The combination recited in claim 2, wherein said power divider network layer is implemented in stripline, and said low noise block is connected via a coaxial connection to said power divider network layer, said low noise block connection being implemented in coplanar waveguide structure.

4. The combination recited in claim 3, wherein said coaxial connection comprises outer and inner portions, said outer portion being connected to said ground plane and to said radiating element layer, said inner portion of said coaxial connection being contacted to said stripline on one side and a center portion of said coplanar waveguide structure on the other, wherein a field which is output by said antenna is rotated via said coaxial connection and output to the low noise block down-converter.

5. The combination recited in claim 1, wherein said low noise block down-converter is disposed at a central portion of said power dividing network layer.

6. The combination recited in claim 1, further comprising a second power divider network layer disposed over said radiating element layer, and a second radiating element layer disposed over said second power divider network layer, said combination further comprising a second low noise block down-converter disposed on a glass substrate on said second power divider network.

7. The combination recited in claim 1, wherein said substrate comprises one of a low loss ceramic substrate and a glass substrate.