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Energy harvesting circuits and associated methods

A technology of energy harvesting and energy storage circuits, applied in the direction of antenna support/mounting device, etc., can solve the problems of increasing the complexity and cost of on-chip antennas

Inactive Publication Date: 2005-10-26
UNIVERSITY OF PITTSBURGH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach increases the complexity and cost of the antenna on a chip, and the size of the antenna is limited due to the need for a magnetic film layer between the antenna coils

Method used

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  • Energy harvesting circuits and associated methods
  • Energy harvesting circuits and associated methods
  • Energy harvesting circuits and associated methods

Examples

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example 1

[0075] It can be seen that the present invention is suitable for use with very small circuits that can be deployed on an integrated circuit chip. For example, assuming that the harvested energy radio frequency (RF) is 915MHz, the effective area of ​​an antenna is usually not less than k×λ 2 , where k is less than or equal to 1, that is, one wavelength at a given frequency (λ) on one side. For example, if the antenna is a typical half-wave dipole with an effective area smaller than λ 2 Not many. At 915MHz, the wavelength λ is approximately 12.908 inches, resulting in kλ for the half-wave dipole used for energy harvesting 2 At k equal to 0.13 there will be 21.66 square inches. The half-wave characteristic means something about the size of the antenna. However, the physical size of an antenna that may beneficially use the present invention will be substantially less than 21.66 square inches.

[0076] As a second example, a "whip" antenna with an effective area of ​​0.5 a qua...

example 2

[0079] To provide a further comparison, consider a test antenna that is a square with side lengths of 1560 microns within a planar antenna on a CMOS chip serving as the test antenna. This antenna is designed to provide a conductive path for one quarter of the wavelength at 915 MHz. The test antenna used in the experiments had a square helix approximately 3.073 inches in length formed within a square with side lengths of 1560 microns. As a result, the length of the wire is a quarter wavelength, but it does not appear as a conventional quarter wavelength whip antenna. The 1560 micron sides form a physical antenna with a side of 0.061417 inches, thus providing a helical antenna with a physical area of ​​0.00377209 square inches.

[0080] In forming the square helix, a conductive aluminum coil was used with a square resistance of 0.03 ohms. The conductive coils are formed on the die as part of the AMI_ABN_1.5μCMOS process. The electrode and inter-electrode dimensions are 13.6 m...

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PUM

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Abstract

An inherently tuned antenna has a circuit for harvesting energy transmitted in space and includes portions that are structured to provide regenerative feedback into the antenna to produce an inherently tuned antenna which has an effective area substantially greater than its physical area. The inherently tuned antenna includes inherent distributive inductive, inherent distributive capacitive and inherent distributive resistive elements which cause the antenna to resonate responsive to receipt of energy at a particular frequency and to provide feedback to regenerate the antenna. The circuit may be provided on an integrated circuit chip. An associated method is provided.

Description

[0001] See related applications [0002] This application claims the benefit of US Provisional Application No. 60 / 403,784, "ENERGY HARVESTING CIRCUITS AND ASSOCIATED METHODS," filed August 15, 2002. technical field [0003] The present invention relates to an inherently tuned antenna having some circuit portions that provide regenerative feedback to the antenna such that the effective area of ​​the antenna is substantially larger than its physical area. Circuitry used in miniaturized form on an integrated circuit chip or die and associated methods. Background technique [0004] It has long been known that energy such as RF signals can be sent over space to various types of receiving antennas for various purposes. [0005] Rudenberg's "Reception of Electric Waves in Wireless Telegraphy" ("Der EmpfangElektricscher Wellen in der Drahtlosen Telegraphie", Annalen derPhysik IV, 25, 1908, pp.446-466) reveals that through non-ideal energy storage circuits and 1 / 4 wavelength whip T...

Claims

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Application Information

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IPC IPC(8): H01Q1/26
Inventor 马林·H·迈克尔克里斯托弗·C·卡佩利哈罗尔德·斯维夫特
Owner UNIVERSITY OF PITTSBURGH