Passive repeater for radio frequency communications

• US 7,429,953 B2
• Filed: 03/03/2006
• Issued: 09/30/2008
• Est. Priority Date: 03/03/2006
• Status: Expired due to Fees

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Buris, Nicholas E., Rachwalski, Richard S., Turney, William J.
• Primary Examiner(s): Nguyen; Hoang V
• Assistant Examiner(s): Karacsony; Robert
• Application Number:
  US11/367,895
• Publication Number:
  US 20070205946A1
• Time in Patent Office: 942 Days
• Field of Search: 455/7, 455/11.1, 455/14, 343/700.MS, 343/880, 343/881
• US Class Current: 343/700.0MS
• CPC Class Codes: B66B 1/3461 between the elevator control system and remote or mobile stations
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

A passive repeater includes: a connecting transmission circuit having first and second opposing ends and made of a flexible material for substantially conforming to a portion of a structure, the structure having first and second opposing sides; first and second antenna elements respectively coupled to the first and second opposing ends of the connecting transmission element; and first and second affixing elements respectively coupled to the first and second antenna elements for attaching the first and second antenna elements to the first and second opposing sides of the structure, wherein the first and second antenna elements are operable to transfer a signal from the first opposing side of the structure to the second opposing side of the structure via the connecting transmission circuit.

Claims

1. A passive repeater comprising:

a connecting transmission circuit having first and second opposing ends and comprised of a first flexible material for substantially conforming to a shape of a portion of a structure, the portion of the structure including portions of first and second opposing sides of the structure and an opening passing through the structure, wherein a first surface of the portion of the first opposing side is at an angle to a second surface of the portion of the second opposing side, and wherein the connecting transmission circuit has a thickness less than a cross-section of the opening and can flexibly conform to the shape of the portion of the structure by the first flexible material of the connecting transmission circuit bending through the angle and passing through the opening so that a first portion of the connecting transmission circuit which includes the first opposing end thereof planarly overlies a portion of the first surface and a second portion of the connecting transmission circuit which includes the second opposing end thereof planarly overlies a portion of the second surface;

first and second antenna elements respectively coupled to the first and second opposing ends of the connecting transmission element wherein each of the first and second antenna elements has a first shape that is substantially planar and a size larger than the opening, and wherein at least one of the first and second antenna elements comprises a second flexible material having a degree of flexibility to allow bending of the at least one of the first and second antenna elements to a second shape having an effective cross-section that is smaller than the cross-section of the opening in order to be inserted through the opening and, after being bent to the second shape, will return to the first shape; and

first and second affixing elements respectively coupled to the first and second antenna elements for attaching the first and second antenna elements to the first and second surfaces of the respective first and second opposing sides of the structure, wherein the first and second antenna elements are operable to transfer a signal from the first opposing side of the structure to the second opposing side of the structure via the connecting transmission circuit.

2. The passive repeater of claim 1, wherein the first and second antenna elements are comprised of the second flexible material, and wherein the first flexible material and the second flexible material are a same flexible material.

3. The passive repeater of claim 2, wherein the first and second antenna elements and the connecting transmission circuit comprise an integral unit.

4. The passive repeater of claim 1, wherein the first and second antenna elements are each at least one of spiral antenna elements, slot antenna elements and printed antenna elements.

5. The passive repeater of claim 1, wherein the first and second antenna elements are each one of single and stacked patch antenna elements.

6. The passive repeater of claim 1, wherein the first and second affixing elements comprise at least one of an adhesive element, a magnetic structure, a Velcro structure and a latching mechanism.

7. The passive repeater of claim 1, wherein the connecting transmission circuit comprises a stripline constructed connecting transmission circuit.

8. An apparatus comprising:

a structure having first and second opposing sides and an opening through the structure from the first opposing side to the second opposing side, wherein the first opposing side includes a first surface at an angle less than three hundred and sixty degrees to a second surface of the second opposing side; and

a passive repeater, the passive repeater comprising;

a connecting transmission circuit having first and second opposing ends and comprised of a first flexible material, wherein the connecting transmission circuit has a thickness less than a cross-section of the opening;

first and second antenna elements each having a first shape that is substantially planar and a size larger than the opening through the structure, the first and second antenna elements comprised of a second flexible material having a degree of flexibility allowing the first and second antenna elements to be bent to a second shape having an effective cross-section that is smaller than a cross-section of the opening in order to be inserted through the opening and, after being inserted through the opening, returning to the first shape, wherein the first and second antenna elements are respectively coupled to the first and second opposing ends of the connecting transmission circuit to form an integral unit with the connecting transmission circuit; and

first and second affixing elements respectively coupled to the first and second antenna elements and attaching the first and second antenna elements to the first and second opposing sides of the structure such that the connecting transmission circuit substantially conforms to a portion of the structure by being bent to the angle so that a first portion of the connecting transmission circuit includes the first opposing end and planarly overlies the first surface of the first opposing side of the structure and a second portion of the connecting transmission circuit includes the second opposing end and planarly overlies the second surface of the second opposing side of the structure and a third portion of the connecting transmission circuit between the first portion and the second portion passes through the opening through the structure, wherein the first and second antenna elements are operable to transfer a signal from the first opposing side of the structure to the second opposing side of the structure via the connecting transmission circuit.

9. A method for affixing a passive repeater to a structure having first and second opposing sides, the first opposing sides including a first surface and the second opposing side including a second surface at an angle to the first surface, and the passive repeater comprising a connecting transmission circuit having first and second opposing ends and comprised of a flexible material, first and second antenna elements respectively coupled to the first and second opposing ends of the connecting transmission element, and first and second affixing elements respectively coupled to the first and second antenna elements, the method comprising the steps of:

locating the first antenna element and the second antenna element in an area beyond the first opposing side of the structure and near an opening through the structure;

inserting the second antenna element through the opening to locate the second antenna element in an area beyond the second opposing side of the structure;

substantially conforming the connecting transmission circuit to a portion of the structure including portions of the first and second opposing sides of the structure and the opening through the structure by bending the flexible material of the connecting transmission circuit through the angle so that a first portion of the connecting transmission circuit which includes the first opposing end planarly overlies the first surface of the first opposing side of the structure and a second portion of the connecting transmission circuit which includes the second opposing end planarly overlies the second surface of the second opposing side of the structure;

attaching the first affixing element to the first surface of the first opposing side of the structure such that the first antenna element is coupled to and planarly overlies the first surface of the first opposing side of the structure; and

attaching the second affixing element to the second opposing side of the structure such that the second antenna element is coupled to and planarly overlies the second surface of the second opposing side of the structure.

10. The method of claim 9, wherein the opening is one of an existing opening through the structure and an opening through the structure created by modifying the structure.

11. The method of claim 9, wherein the step of inserting the second antenna through the opening comprises the steps of:

bending the second antenna element into a shape having a cross-section that is smaller than a cross-section of a shape of the opening; and

inserting the second antenna element through the opening to locate the second antenna element in the area beyond the second opposing side of the structure.

12. The method of claim 11 wherein the step of bending the second antenna element comprises the step of rolling the second antenna into a circular shape having a cross-section that is smaller than the cross-section of the shape of the opening.

13. An apparatus comprising:

a structure having a portion including first and second opposing sides of the structure and a movable section thereof, wherein a first surface of the first opposing side is at an angle to a second surface of the second opposing side; and

a passive repeater, the passive repeater comprising;

a connecting transmission circuit having first and second opposing ends and comprised of a flexible material for substantially conforming to a shape of the portion of the structure by the flexible material of the connecting transmission circuit bending through the angle so that a first portion of the connecting transmission circuit which includes the first opposing end thereof planarly overlies a portion of the first surface and a second portion of the connecting transmission circuit which includes the second opposing end thereof planarly overlies a portion of the second surface, the connecting transmission circuit passing through an opening within the portion of the structure near the movable section without interfering with movement of the movable section;

first and second antenna elements respectively coupled to the first and second opposing ends of the connecting transmission element; and

first and second affixing elements respectively coupled to the first and second antenna elements for attaching the first and second antenna elements to the first and second surfaces of the respective first and second opposing sides of the structure, wherein the first and second antenna elements are operable to transfer a signal from the first opposing side of the structure to the second opposing side of the structure via the connecting transmission circuit.

14. The apparatus of claim 13, wherein at least one of the first and second antenna elements has a first shape that is larger than the opening, the at least one of the first and second antenna elements comprised of a flexible material having a degree of flexibility which allows the at least one of the first and second antenna elements to be bent from the first shape to a second shape having an effective cross-section less than a cross-section of the opening and, thereafter, naturally returning to the first shape.

15. The apparatus of claim 13, wherein the portion of the structure includes one or more of an access panel, a door, a doorjamb and a wall.

16. The apparatus of claim 15 wherein the movable section comprises the access panel.

17. The apparatus of claim 15 wherein the movable section comprises the door.

18. The apparatus of claim 13, wherein the first and second antenna elements and the connecting transmission circuit comprise an integral unit.

19. The apparatus of claim 13, wherein the first and second antenna elements are each at least one of spiral antenna elements, slot antenna elements and printed antenna elements.

20. The apparatus of claim 13, wherein the first and second antenna elements are each one of single and stacked patch antenna elements.