Method and system for satellite using multifunctional motherboard

• US 9,960,836 B2
• Filed: 10/14/2014
• Issued: 05/01/2018
• Est. Priority Date: 05/19/2014
• Status: Active Grant

• Current Assignee: L-3 Technologies, Inc.
• Original Assignee: L-3 Technologies, Inc.
• Inventors: Ralph, Loren Edward, Rodgers, Eddie, Roberson, James H.
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US15/312,603
• Publication Number:
  US 20170187451A1
• Time in Patent Office: 1,295 Days
• Field of Search: 455 121, 455 131, 455 133
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays
• CPC Class Codes: H05K 1/0243 Printed circuits associated with mounted high frequency components
• CPC Class Codes: H05K 3/3452 Solder masks

Abstract

A satellite is configured for use in space so as to receive RF signals, convert them to a different frequency range, and retransmit the converted RF signals. The satellite comprises a payload area supporting a motherboard structure with a plurality of frequency converters supported on it. The frequency converters are each connected with an antenna system of the satellite so that each of them receives a respective RF input signal. A local oscillator source supported on said motherboard structure generates a local oscillator signal, and a motherboard in the motherboard structure receives the local oscillator signal and transmits it through the motherboard to each of the frequency converters. The frequency converters each convert the respective RF input signal to a respective RF output signal using the local oscillator signal and transmit the RF output signal to the antenna system so as to be transmitted wirelessly.

Claims

1. A satellite configured for use in space so as to receive RF signals, convert said RF signals to a different frequency range, and re-transmit said converted RF signals, said satellite comprising:

a payload area supporting a motherboard structure including a motherboard;

a plurality of frequency converters each connected with an antenna system of the satellite so that each of the frequency converters receives a respective RF input signal, said frequency converters each being supported on said motherboard structure;

a local oscillator source supported on said motherboard structure and generating a local oscillator LO signal;

the motherboard configured to receive the local oscillator signal from the local oscillator signal source and transmit said local oscillator LO signal through the motherboard to each of the frequency converters;

said frequency converters each configured to convert the respective RF input signal to a respective RF output signal using said local oscillator signal and to transmit the RF output signal to the antenna system so as to be transmitted wirelessly;

wherein the motherboard includes strip lines connected so as to carry the LO signal from the LO signal source to each of the frequency converters; and

wherein the motherboard has a layered structure, and the strip lines are supported in said layered structure with a strip line conductor in a layer of the layered structure, and the motherboard has a protective metallic layer and a ground layer above and below the layer of the strip line conductor and separated therefrom by intermediate layers.

2. The invention according to claim 1, wherein the strip lines are connected with the frequency converters by coaxial push connection sockets supported on the motherboard.

4. The invention according to claim 1, and further comprising a power supply system configured to supply power used by the frequency converters, said power supply system being supported on the motherboard and being electrically connected thereto so as to supply the power thereto, the motherboard being configured to carry the electrical power to the frequency converters.

5. The invention according to claim 4, wherein the motherboard carries the electrical power to the frequency converters through at an additional layer or a plurality of additional layers of conductive material in the layered structure that is isolated from and shielded from the layer carrying the LO signal.

6. The invention according to claim 5, wherein the satellite has additional circuitry that transmits to said motherboard electrical signals operable as commands that cause one or more of the frequency converters to alter operation thereof, said electrical signals being received by the motherboard and carried to a relevant frequency converter through said at least one additional layer or plurality of additional layers.

7. The invention according to claim 6, wherein the circuitry includes command and telemetry slices mounted on and connected electrically with the motherboard.

8. The invention according to claim 4, wherein the power supply system also provides power for the LO signal source, and the motherboard receives and carries the power for the LO signal source thereto through said at least one additional layer or plurality of additional layers.

9. The invention according to claim 4, wherein the power supply includes a power conditioner receiving electrical power from power systems of the satellite, said power conditioner being supported on the motherboard and modifying the electrical power so as to transmit to the motherboard an electrical current having a voltage that can be received and used by the frequency converters.

10. The invention according to claim 4, and further comprising a second power supply system wired in parallel with the first power supply system, said second power supply system being configured to supply power used by the frequency converters through the motherboard in the event of failure of the first power supply.

3. A satellite configured for use in space so as to receive RF signals, convert said RF signals to a different frequency range, and re-transmit said converted RF signals, said satellite comprising:

a payload area supporting a motherboard structure including a motherboard;

a plurality of frequency converters each connected with an antenna system of the satellite so that each of the frequency converters receives a respective RF input signal, said frequency converters each being supported on said motherboard structure;

a local oscillator source supported on said motherboard structure and generating a local oscillator LO signal;

the motherboard configured to receive the local oscillator signal from the local oscillator signal source and transmit said local oscillator LO signal through the motherboard to each of the frequency converters;

said frequency converters each configured to convert the respective RF input signal to a respective RF output signal using said local oscillator signal and to transmit the RF output signal to the antenna system so as to be transmitted wirelessly; and

wherein the plurality of frequency converters comprises eight frequency converters, and the motherboard has splitter circuitry therein that includes a first splitter that splits the LO signal into two initial LO signals, and then two subsequent splitters receiving and splitting each of the two initial LO signals into two subsequent LO signals, and then four final splitters that each receives a respective subsequent LO signal and splits it into two transmitted LO signals, resulting in eight transmitted LO signals, each of said transmitted LO signals being carried by the motherboard to a respective one of the frequency converters.

17. The invention according to claim 3, wherein the motherboard includes strip lines connected so as to carry the LO signal from the LO signal source to each of the frequency converters.

11. A satellite configured for use in space so as to receive RF signals, convert said RF signals to a different frequency range, and re-transmit said converted RF signals, said satellite comprising:

a payload area supporting a motherboard structure including a motherboard;

a plurality of frequency converters each connected with an antenna system of the satellite so that each of the frequency converters receives a respective RF input signal, said frequency converters each being supported on said motherboard structure;

a local oscillator source supported on said motherboard structure and generating a local oscillator LO signal;

the motherboard configured to receive the local oscillator signal from the local oscillator signal source and transmit said local oscillator LO signal through the motherboard to each of the frequency converters;

said frequency converters each configured to convert the respective RF input signal to a respective RF output signal using said local oscillator signal and to transmit the RF output signal to the antenna system so as to be transmitted wirelessly; and

wherein the RF input signal has a frequency in a range from about 26.5 GHz to about 40 GHz, the LO signal has a frequency in a range from 1 GHz to 15 GHz, and the RF output signal has a frequency of about 100 MHz to 25 GHz.

12. The invention according to claim 11, and further comprising a second plurality of frequency converters and a second LO signal source supported on the motherboard structure, the motherboard carrying a second LO signal from the second LO signal source to the second plurality of frequency converters so as to be used in converting input RF signals transmitted to said second plurality of frequency converters into output RF signals in a different frequency range.

13. The invention according to claim 12, wherein a power supply supported on the motherboard structure supplies power through the motherboard to the first and second plurality of frequency converters.

14. A satellite configured for use in space so as to receive RF signals, convert said RF signals to a different frequency range, and re-transmit said converted RF signals, said satellite comprising:

a payload area supporting a motherboard structure including a motherboard;

a plurality of frequency converters each connected with an antenna system of the satellite so that each of the frequency converters receives a respective RF input signal, said frequency converters each being supported on said motherboard structure;

a local oscillator source supported on said motherboard structure and generating a local oscillator LO signal;

the motherboard configured to receive the local oscillator signal from the local oscillator signal source and transmit said local oscillator LO signal through the motherboard to each of the frequency converters;

said frequency converters each configured to convert the respective RF input signal to a respective RF output signal using said local oscillator signal and to transmit the RF output signal to the antenna system so as to be transmitted wirelessly; and

wherein the motherboard supports a second LO signal source wired in parallel with the first LO signal source so as to supply a second LO signal to the frequency converters via the motherboard in the event of failure of the first LO signal source.

15. The invention according to claim 14, wherein the motherboard is supported on a base plate, said base plate having a side with a recess configured to receive the motherboard therein, and the payload area of the satellite including a generally planar surface to which said base plate is secured so as to cover the motherboard;

the base plate having apertures therein aligning with sockets on the motherboard, said frequency converters connecting electrically to said sockets on the motherboard through said apertures.

16. The invention according to claim 15, wherein one or more bolts extend through the motherboard and are secured to the surface of the payload area, said bolts extending through support members in apertures in the motherboard, said support members supporting the motherboard on the surface of the payload area.

18. A motherboard structure configured for use in a satellite, said motherboard structure including:

a motherboard having a layered structure including a plurality of layers of conductive material interlying with each other and separated from each other by material having insulative or capacitave properties;

a support structure secured to said motherboard;

a power supply module supported on the support structure and electrically connected to the motherboard so as to supply one or more electrical currents thereto;

a LO signal generator supported on the support structure and electrically connected to the motherboard so as to supply an LO signal having a first frequency to the motherboard;

eight frequency converters supported on the support structure and each connected with an antenna system so as to each receive therefrom a respective incoming RF signal, each of said frequency converters being electrically connected with the motherboard;

the motherboard having a first circuitry arrangement extending via a set of the layers thereof, said first circuitry arrangement carrying electrical current from the power supply to the LO signal generator and to the frequency converters so as to provide power for the operation thereof;

the motherboard having a second circuitry arrangement extending via a second set of layers thereof, said second circuitry arrangement being configured as a strip line carrying the LO signal from the LO signal generator to the frequency converters, said strip line having a plurality of splitters dividing the LO signal into eight derivative LO signals, each supplied to a respective frequency converter;

each of the frequency converters converting the respective incoming RF signal using the LO signal and producing a respective output RF signal, said frequency converters each transmitting the output RF signal to an antenna transmission system;

wherein the support structure is a plate member having a recess receiving the motherboard therein, said plate member being affixed to a planar portion of the satellite with the motherboard secured therebetween; and

the frequency converters, the power supply and the LO signal generator all being secured to an outer surface of the plate member and each being plugged into the motherboard through apertures in the plate member through which sockets on the motherboard are accessible, the sockets including a coaxial push-plug connection for each of the frequency converters and for the LO signal generator through which plugs the LO signal is transmitted.

19. The invention according to claim 18, and further comprising a second LO signal generator and a second power supply connected in parallel with the first LO signal generator and the first power supply, respectively, said second LO signal generator and the second power supply being configured to transmit a second LO signal or additional electrical power in the event of a failure of the first LO signal generator or the first power supply, respectively.

20. The invention according to claim 18, wherein the LO signal generator is a PLVCO operating with a TCXO, both of which are supported on the motherboard support structure and receive electrical power from the motherboard.

21. A motherboard structure configured for use in a satellite, said motherboard structure including:

a motherboard having a layered structure including a plurality of layers of conductive material interlying with each other and separated from each other by material having insulative or capacitave properties;

a support structure secured to said motherboard;

a power supply module supported on the support structure and electrically connected to the motherboard so as to supply one or more electrical currents thereto;

a LO signal generator supported on the support structure and electrically connected to the motherboard so as to supply an LO signal having a first frequency to the motherboard;

eight frequency converters supported on the support structure and each connected with an antenna system so as to each receive therefrom a respective incoming RF signal, each of said frequency converters being electrically connected with the motherboard;

the motherboard having a first circuitry arrangement extending via a set of the layers thereof, said first circuitry arrangement carrying electrical current from the power supply to the LO signal generator and to the frequency converters so as to provide power for the operation thereof;

the motherboard having a second circuitry arrangement extending via a second set of layers thereof, said second circuitry arrangement being configured as a strip line carrying the LO signal from the LO signal generator to the frequency converters, said strip line having a plurality of splitters dividing the LO signal into eight derivative LO signals, each supplied to a respective frequency converter;

each of the frequency converters converting the respective incoming RF signal using the LO signal and producing a respective output RF signal, said frequency converters each transmitting the output RF signal to an antenna transmission system;

wherein a further eight frequency converters and a second LO signal generator are supported on the support member, and the motherboard carries electrical power to all sixteen of the frequency converters and both of the LO signal generators from said power supply; and

the motherboard receives a second LO signal from the second LO signal generator and transmits it split into eight divided LO signals to the further eight frequency converters via strip lines and splitters in the same set of layers as for transmitting the first LO signal.