Double-Slotted Loop Antenna Tuning With Partitioned LC Networks

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Solution Overview

Problem

Existing RF devices face challenges in reducing cost, size, and improving reliability while maintaining effective RF signal transmission and reception, particularly due to limitations in antenna design and integration of resonator and radiator structures.

Innovation Solution

The implementation of a partitioned antenna structure where parts of the resonator and radiator are included within a module and external components are fabricated separately, allowing for flexible tuning and reduced module size, along with the use of impedance matching circuits using lumped components to optimize RF performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chip antennas are used in RF modules, then integration and reliability are improved, but cost and flexibility are worsened

Engineering Contradiction:

Improveantenna integration reliabilityVSAvoidfrequency tuning flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The antenna system is segmented into two functional parts: a printed monopole antenna structure integrated into the module for reliability, and external LC resonant networks for frequency tuning flexibility. This segmentation allows each part to optimize its specific function while resolving the contradiction between integration and adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The antenna system incorporates dynamically adjustable LC resonant networks that can be tuned to different frequencies. This dynamic capability allows the same physical antenna structure to operate at multiple frequencies, providing flexibility without requiring multiple fixed antennas.

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If traditional RF module designs are used, then manufacturing simplicity is maintained, but module size and cost are worsened

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidmodule size

Core Design Contradiction:

Ease of manufactureVSVolume of stationary object

Solution Approach 1:

The design moves the LC resonant networks to an external dimension rather than integrating them within the module footprint. This dimensional separation reduces module size while maintaining manufacturing simplicity, as the external networks can be fabricated separately and connected via standard interfaces.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If resonator and radiator structures are fully integrated, then reliability is improved, but design flexibility and tuning capability are worsened

Engineering Contradiction:

Improvestructure integration reliabilityVSAvoidfrequency operation customization

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The printed monopole antenna acts as an intermediary between the integrated module and the external LC resonant networks. It provides a stable, reliable radiation element that can be coupled with different resonant networks to achieve frequency customization without compromising structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach enables efficient tuning of antennas, reduces module size, lowers costs, and enhances flexibility in RF device design by allowing for customizable frequency operation without significant detuning, while avoiding the use of chip antennas.

Implementation Method 1

first and second inductive-capacitive (LC) resonant networks that are coupled to the printed monopole antenna

Methodology Applied

Scientific EffectInductive-capacitive (LC) resonance: Resonance

Implementation Method 2

includes a first inductor coupled to a first plurality capacitors

Methodology Applied

Scientific EffectElectromagnetic energy storage: Inductor

Implementation Method 3

includes a second inductor coupled to a second plurality capacitors

Methodology Applied

Scientific EffectElectromagnetic energy storage: Capacitance

Implementation Method 4

The antenna structure includes a printed monopole antenna

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 5

a double slotted loop coupled to the first and second LC resonant networks

Methodology Applied

Scientific EffectElectromagnetic coupling: Resonance

Data Source

PatentUS12555910B2Antenna structure with double-slotted loop and associated methods

Publication Date: 2026.02.17 SILICON LABORATORIES INC

AI summary

An apparatus includes a module. The module includes an antenna structure. The antenna structure includes a printed monopole antenna. The antenna structure further includes first and second inductive-capacitive (LC) resonant networks that are coupled to the printed monopole antenna. The antenna structure further includes a double slotted loop coupled to the first and second LC resonant networks.