Short Feeder-Line Antenna Layout for Moisture-Exposed RF Transmission

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Solution Overview

Problem

Radio waves are attenuated by dielectric loss in environments with high moisture content, such as water or body tissues, leading to weakened signal intensity and the need for increased power supply to maintain transmission, especially when the device is thin and compact.

Innovation Solution

The electric wave transmission device incorporates a dielectric layer covering the feeder line and antenna, limiting the wiring length to 35 mm or less, and using a dielectric layer thickness of 0.5 mm or less to suppress dielectric loss and efficiently transmit radio waves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the protective layer or housing is made thinner to reduce device size, then the device becomes more compact, but high-frequency signals are attenuated by dielectric loss from the surrounding environment

Engineering Contradiction:

Improvedevice sizeVSAvoidhigh-frequency signal attenuation

Core Design Contradiction:

Volume of moving objectVSLoss of energy

Solution Approach 1:

The patent changes the physical parameters of the feeder line by limiting its length to 35mm or less and reducing the dielectric layer thickness to 0.5mm or less. These parameter changes reduce the propagation path of high-frequency signals through the dielectric, thereby minimizing dielectric loss while maintaining device compactness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a thin dielectric layer (0.5mm or less) as a protective covering that provides environmental protection while minimizing the distance high-frequency signals travel through the dielectric material, thus reducing dielectric loss without sacrificing protective functionality

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If more electric power is supplied to maintain radio wave intensity, then the transmission reliability is improved, but the energy consumption increases

Engineering Contradiction:

Improveradio wave transmission reliabilityVSAvoidelectric power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful effect of dielectric loss into a beneficial design constraint by limiting the feeder line length to 35mm or less. This design choice reduces signal attenuation, allowing reliable radio wave transmission at lower power levels, thus improving transmission reliability without increasing energy consumption

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If the wiring length of the feeder line is increased, then the device layout flexibility is improved, but the dielectric loss of high-frequency signals increases

Engineering Contradiction:

Improvedevice layout flexibilityVSAvoiddielectric loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent establishes a strict parameter limit for the feeder line length (35mm or less) to minimize dielectric loss. This constraint drives the design to optimize component placement and routing within the limited length, achieving necessary layout flexibility while controlling signal attenuation

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design effectively reduces dielectric loss, allowing efficient radio wave transmission even in high-moisture environments while maintaining a compact device size, with applications in underwater sensing, medical capsules, and wildlife tracking.

Implementation Method 1

a dielectric layer, in which the electric wave transmission circuit has a high frequency control unit, a feeder line, and an antenna, the feeder line and the antenna are covered with the dielectric layer, the dielectric layer protects the electric wave transmission device

Methodology Applied

Scientific EffectDielectric: Dielectric

Implementation Method 2

when the surrounding environment is water, sea water, an electrolytic solution, or a substance or a tissue that contains a certain amount of moisture, a dielectric loss tangent of the surrounding environment is high, so that the high-frequency signal flowing on the board is attenuated by the dielectric loss

Methodology Applied

Scientific EffectDielectric loss: Dielectric

Data Source

PatentUS12548895B2Electric wave transmission device and wireless communication system

Publication Date: 2026.02.10 SEIKO GRP CORP

AI summary

An electric wave transmission device includes an electronic device having a circuit board on which an electric wave transmission circuit is formed and a dielectric layer, in which the electric wave transmission circuit has a high frequency control unit, a feeder line, and an antenna, the high frequency control unit supplies a high-frequency signal in one or more frequency bands to the antenna via the feeder line, the feeder line and the antenna are covered with the dielectric layer, the dielectric layer protects the electric wave transmission device such that the electric wave transmission device is in a usable state while being in contact with water, sea water, an electrolytic solution, or a substance or a tissue containing a certain amount of moisture, and a wiring length of the feeder line is equal to or less than 35 mm.