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Fob with increased power level from hand-antenna coupling

A keychain and antenna technology, applied in the field of keychains, can solve problems such as difficulties and size limitations

Active Publication Date: 2017-07-28
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some key fobs this may be difficult due to e.g. size constraints

Method used

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  • Fob with increased power level from hand-antenna coupling
  • Fob with increased power level from hand-antenna coupling
  • Fob with increased power level from hand-antenna coupling

Examples

Experimental program
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Embodiment Construction

[0038] introduction

[0039] As mentioned above, key fobs are generally designed for maximum power output in free space. With regard to the operation of the key fob, free space may be defined as a space substantially free from interference from radio frequency transmissions. An alternative solution is to design the fob such that the output power of the fob increases due to coupling from the hand close to the antenna. The key fob transceiver may be designed such that electrical coupling between the hand (or other object) and the radio frequency antenna results in an improved match between the output impedance of the power amplifier and the effective load impedance seen by the power amplifier. This improved matching can increase the output power and increase the range of the key fob. By allowing the antenna to be located, for example, near the enter button, within the enter button, or near other areas of the key fob that are likely to be contacted by the hand (or part of the h...

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PUM

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Abstract

A key fob includes a power amplifier including an output having an output impedance. A radio frequency antenna connected to the power amplifier output represents a first load impedance to the power amplifier output in a space substantially free of interference for radio frequency transmissions, and a second load impedance to the power amplifier output when a hand of a user is capacitively coupled to the antenna. The difference between the second load impedance and the output impedance of the power amplifier is less than the difference between the first load impedance and the output impedance.

Description

technical field [0001] The present invention relates generally to vehicle key fobs, and more particularly to key fobs with increased power levels from hand-antenna coupling. Background technique [0002] A remote keyless entry system (RKE system) includes a remote control device, sometimes referred to as a key fob or key fob, used by a vehicle operator that communicates with a base unit embedded in the vehicle. The range of the RKE system—ie, the possible distance between the key fob operated by the vehicle operator and the base unit—is a characteristic of the perceived system quality. The range of the system varies according to the radio frequency (RF) output power of the key fob, and is generally designed to have maximum power and thus maximum range when operating in free space. Objects—for example, the hand of a person operating a key fob—close to the antenna can reduce output power, resulting in a reduction in range. One solution for preventing or reducing the amount o...

Claims

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Application Information

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IPC IPC(8): G07C9/00
CPCG07C9/00174H04W52/283H04W52/42H04W52/50G07C2009/00341G07C2009/00793G08C17/02G08C2201/63G07C9/00309H04W52/18G07C2009/00769G07C2009/00984H03F3/245
Inventor 马克·威斯内夫斯基泰伊·亚瑟·温克尔约翰·弗雷德里克·洛克劳伦斯·巴纳斯基托马斯·约瑟夫·赫尔曼
Owner FORD GLOBAL TECH LLC