Grid bracket structure for mm-wave end-fire antenna array

• US 10,020,590 B2
• Filed: 07/19/2016
• Issued: 07/10/2018
• Est. Priority Date: 07/19/2016
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Schmalenberg, Paul D., Li, Meijiao, Lee, Jae Seung
• Primary Examiner(s): Nguyen, Hoang
• Assistant Examiner(s): Salih, Awat
• Application Number:
  US15/213,690
• Publication Number:
  US 20180026376A1
• Time in Patent Office: 721 Days
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 7/03 Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
• CPC Class Codes: H01Q 1/14 for wire or other non-rigid radiating elements
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 1/3283 side-mounted antennas, e.g. bumper-mounted, door-mounted mounted on windscreens H01Q1/1271
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends
• CPC Class Codes: H01Q 13/20 Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 3/005 using remotely controlled antenna positioning or scanning

Abstract

Bracket structures that structurally support and enhance the performance of millimeter-wave tapered-slot end-fire antennas for use in vehicular radar systems. The system includes a first longitudinal rib and a second longitudinal rib, each defining a first longitudinal slot and having a transmission end and a chip connection end. The system includes a crossbeam coupled to the first longitudinal rib and the second longitudinal rib. The system includes a first end-fire antenna having a transmission end that is received by the first longitudinal slot and a chip connection end. The first end-fire antenna is designed to transmit a first signal having a first phase. The system includes a second end-fire antenna having a transmission end that is received by the second longitudinal slot and a chip connection end. The second end-fire antenna is designed to transmit a second signal having a second phase that is different than the first phase.

Claims

1. A structurally supported millimeter-wave end-fire antenna system for use in vehicular radar systems comprising:

a first longitudinal rib having a width, a height that is greater than the width, and a length that is greater than the height, defining a first longitudinal slot extending for a portion of the length of the first longitudinal rib, and having a transmission end and a chip connection end;

a second longitudinal rib parallel to the first longitudinal rib, having a width, a height that is greater than the width, and a length that is greater than the height, defining a second longitudinal slot extending for a portion of the length of the first longitudinal rib, and having a transmission end and a chip connection end;

a longitudinal crossbeam coupled to the first longitudinal rib and the second longitudinal rib and extending in a direction perpendicular to the first longitudinal rib and the second longitudinal rib;

a first end-fire antenna having a height that is less than the height of the first longitudinal rib, a transmission end that is received by the first longitudinal slot such that the transmission end of the first longitudinal rib extends beyond the transmission end of the first end-fire antenna, and a chip connection end that extends beyond the chip connection end of the first longitudinal rib, and configured to transmit a first signal having a first phase; and

a second end-fire antenna having a height that is less than the height of the first longitudinal rib, a transmission end that is received by the second longitudinal slot such that the transmission end of the second longitudinal rib extends beyond the transmission end of the second end-fire antenna, and a chip connection end that extends beyond the chip connection end of the second longitudinal rib, and configured to transmit a second signal having a second phase that is different than the first phase.

2. The millimeter-wave end-fire antenna system of claim 1 wherein the width of the first longitudinal rib is less than a quarter of a size of a wavelength of the first signal and the height of the first longitudinal rib is greater than or equal to two times the size of the wavelength of the first signal.

3. The millimeter-wave end-fire antenna system of claim 1 wherein the first end-fire antenna has a balun proximate to the chip connection end of the first end-fire antenna that is exposed when the transmission end of the first end-fire antenna is received by the first longitudinal slot.

4. The millimeter-wave end-fire antenna system of claim 1 wherein the first signal is transmitted from the transmission end of the first end-fire antenna and wherein the transmission end of the first longitudinal rib has an ellipsoid shape having a vertex extending away from the first longitudinal slot for focusing a wave of the first signal.

5. The millimeter-wave end-fire antenna system of claim 1 wherein a material of the first longitudinal rib has a loss tangent that is less than 0.01 and an epsilon permittivity that is between 1 and 3.

6. The millimeter-wave end-fire antenna system of claim 1 further comprising:

a printed circuit board having an antenna controller for the first end-fire antenna and the second end-fire antenna and on which the first end-fire antenna and the second end-fire antenna are positioned; and

a rectangular frame that defines the first longitudinal rib, the second longitudinal rib, and the longitudinal crossbeam and has a first frame portion and a second frame portion such that at least a portion of the printed circuit board is sandwiched between the first frame portion and the second frame portion.

7. The millimeter-wave end-fire antenna system of claim 1 further comprising a third longitudinal rib defining a third longitudinal slot, a fourth longitudinal rib defining a fourth longitudinal slot, a third end-fire antenna positioned within the third longitudinal slot, and a fourth end-fire antenna positioned within the fourth longitudinal slot, wherein the third longitudinal rib is stacked above the first longitudinal rib and the fourth longitudinal rib is stacked above the second longitudinal rib such that the longitudinal crossbeam is at least partially positioned between the first longitudinal rib and the third longitudinal rib and at least partially positioned between the second longitudinal rib and the fourth longitudinal rib.

8. A structurally supported millimeter-wave end-fire antenna system for use in vehicular radar comprising:

a first end-fire antenna having a top and a bottom and configured to transmit a first signal having a first phase;

a second end-fire antenna having a top and a bottom and configured to transmit a second signal having a second phase;

a first longitudinal rib having a first slat positioned on the top of the first end-fire antenna and a second slat positioned on the bottom of the first end-fire antenna such that the first end-fire antenna is sandwiched between the first slat and the second slat of the first longitudinal rib;

a second longitudinal rib having a first slat positioned on the top of the second end-fire antenna and a second slat positioned on the bottom of the second end-fire antenna such that the second end-fire antenna is sandwiched between the first slat and the second slat of the second longitudinal rib;

a crossbeam coupled to the first longitudinal rib and the second longitudinal rib and extending in a direction perpendicular to the first longitudinal rib and the second longitudinal rib; and

a third end-fire antenna having a top and a bottom;

a fourth end-fire antenna having a top and a bottom;

a third longitudinal rib parallel to the first longitudinal rib and the second longitudinal rib, positioned above the first longitudinal rib, and having a first slat positioned on the top of the third end-fire antenna and a second slat positioned on the bottom of the third end-fire antenna such that the second slat of the third longitudinal rib is proximate to the first slat of the first longitudinal rib; and

a fourth longitudinal rib parallel to the third longitudinal rib, positioned above the second longitudinal rib, and having a first slat positioned on the top of the fourth end-fire antenna and a second slat positioned on the bottom of the fourth end-fire antenna such that the second slat of the fourth longitudinal rib is proximate to the first slat of the second longitudinal rib.

9. The millimeter-wave end-fire antenna system of claim 8 wherein the first end-fire antenna has a longitudinal orientation and is parallel to the first longitudinal rib and wherein the first longitudinal rib has a width that is less than a quarter of a size of a wavelength of the first signal and a height that extends perpendicular to a length of the first end-fire antenna for a distance that is greater than or equal to two times the size of the wavelength of the first signal.

10. The millimeter-wave end-fire antenna system of claim 8 wherein the first end-fire antenna has a transmission end from which the first signal is propagated and the first longitudinal rib has a transmission end that extends beyond the transmission end of the first end-fire antenna and has an ellipsoid shape having a vertex extending away from the first end-fire antenna for focusing a wave of the first signal.

11. The millimeter-wave end-fire antenna system of claim 8 wherein the crossbeam is a main body that is aligned with an entirety of the first longitudinal rib and the second longitudinal rib and is continuous along a first plane that is parallel to a second plane defined by the first end-fire antenna and the second end-fire antenna.

12. The millimeter-wave end-fire antenna system of claim 8 wherein the first end-fire antenna has a chip connection end and a balun proximate to the chip connection end that is exposed when the first end-fire antenna is sandwiched between the first slat and the second slat of the first longitudinal rib.

13. A structurally supported millimeter-wave end-fire antenna system for use in vehicular radar systems comprising:

a radar mount having;

a first longitudinal rib defining a first longitudinal slot,

a second longitudinal rib defining a second longitudinal slot, and

at least one cross-beam coupled to the first longitudinal rib and the second longitudinal rib;

a first end-fire antenna formed on a first printed circuit board and configured to be received by the first longitudinal slot;

a second end-fire antenna formed on the first printed circuit board and configured to be received by the second longitudinal slot; and

a third longitudinal rib stacked above or below the first longitudinal rib, spaced from the first longitudinal rib by the at least one cross-beam, and defining a third longitudinal slot;

a fourth longitudinal rib stacked above or below the second longitudinal rib, spaced from the second longitudinal rib by the at least one cross-beam, and defining a fourth longitudinal slot;

a third end-fire antenna formed on a second printed circuit board and configured to be received by the third longitudinal slot; and

a fourth end-fire antenna formed on the second printed circuit board and configured to be received by the fourth longitudinal slot.

14. The structurally supported millimeter-wave end-fire antenna system of claim 13 wherein:

each of the first longitudinal rib, the second longitudinal rib, the first end-fire antenna, and the second end-fire antenna have a transmission end and a chip connection end; and

the transmission end of the first longitudinal rib and the second longitudinal rib extend for a distance beyond the transmission end of the first end-fire antenna, and the second end-fire antenna.

15. The structurally supported millimeter-wave end-fire antenna system of claim 14 wherein the transmission end of the first longitudinal rib forms an ellipsoid shape having a vertex extending away from the transmission end of the first end-fire antenna for focusing a wave transmitted by the first end-fire antenna.

16. The structurally supported millimeter-wave end-fire antenna system of claim 13 wherein:

the first end-fire antenna includes a transmission end, a chip connection end, and a balun located proximate to the chip connection end;

the first end-fire antenna includes a wave section extending towards the transmission end from the balun and having a first wave section having a first plurality of wave-shaped structures and a second wave section having a second plurality of wave-shaped structures;

the first end-fire antenna includes a tapered section that is tapered from the wave section to the balun; and

the first longitudinal rib is located between the first wave section and the second wave section and contacts the first end-fire antenna at a location along the tapered section.

17. The structurally supported millimeter-wave end-fire antenna system of claim 13 wherein the first end-fire antenna is configured to transmit a signal having a wavelength, and the first longitudinal rib has a width that is less than a quarter of a size of the wavelength of the signal transmitted by the first end-fire antenna.

18. The structurally supported millimeter-wave end-fire antenna system of claim 13 further comprising:

an antenna controller positioned on the first printed circuit board and configured to control operation of the first end-fire antenna and the second end-fire antenna; and

a frame configured to at least partially house the first printed circuit board and configured to be coupled to or to define the first longitudinal rib and the second longitudinal rib.