Antenna Structure With Serial Capacitance And Impedance Adjustment

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Solution Overview

Problem

Traditional metallic planar antennas in mobile devices face design limitations due to fixed impedance values of SMT elements, restricting frequency width and efficiency, and existing solutions like inwardly recessed sections and protruding sheets are inadequate for adjusting capacitance and inductance values.

Innovation Solution

A serial connected capacitance effect is achieved in an antenna structure using a first and second metallic plane board with a microstrip extension arm, allowing optional grounding for impedance adjustment, and a communicating element between feed-in and grounding points on a carrier plate for frequency tuning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If SMT elements with fixed standard impedance values are used to connect metallic planar antennas, then the connection is simple and standardized, but the frequency width and efficiency of the antenna are limited due to inability to adjust capacitance and inductance values

Engineering Contradiction:

Improvefrequency widthVSAvoidantenna structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The antenna is divided into multiple independent metallic plane boards (first, second, third, fourth) that can be separately adjusted. Each board can be independently positioned and grounded to fine-tune the capacitance and inductance values, enabling precise impedance matching across different frequency bands without requiring complex integrated circuits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The antenna structure incorporates adjustable and reconfigurable elements where the metallic plane boards can be dynamically positioned relative to each other. The grounding connections can be selectively activated or deactivated to change the electrical characteristics, allowing the antenna to adapt its impedance and frequency response based on operational requirements.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If inwardly recessed sections and protruding sheets are used to adjust matching frequency, then frequency adjustment is possible, but the antenna elongation cannot appropriately adjust values of capacitances and inductances

Engineering Contradiction:

Improvecapacitance and inductance adjustmentVSAvoidantenna elongation

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

Instead of relying solely on longitudinal elongation to adjust electrical parameters, the invention introduces adjustment in the transverse dimension by positioning multiple metallic plane boards at different locations. The capacitance and inductance values are controlled by the spatial arrangement and spacing between boards rather than just the length of the antenna, enabling independent optimization of both dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Different regions of the antenna structure have specialized functions: certain metallic plane boards are positioned to provide capacitive effects while others provide inductive effects. The grounding points are strategically located to create localized electrical characteristics, allowing precise control of capacitance and inductance values in specific areas of the antenna structure.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If conventional antenna structures with standard impedance values are used, then manufacturing is simple, but impedance matching is limited and frequency width is restricted

Engineering Contradiction:

Improveimpedance matchingVSAvoidantenna structure

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The multiple metallic plane boards serve multiple functions simultaneously: they act as radiating elements, capacitive components, inductive components, and grounding references. This multi-functionality allows a single antenna structure to achieve broadband operation and impedance matching across multiple frequency bands without requiring separate components for each function, maintaining manufacturing simplicity while enhancing adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances frequency width and efficiency by enabling adjustable impedance matching and capacitance/inductance values, surpassing the limitations of conventional antennas with standard impedance values.

Implementation Method 1

a second metallic plane board being close to but not connected to the first metallic plane board to form the effect of capacitance in serial connecting

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9306287B2Antenna structure with an effective serial connecting capacitance

Publication Date: 2016.04.05 AUDEN TECHNO CORP

AI summary

In an antenna structure having a serial connected capacitance effect, mainly a metallic planar antenna is provided thereon at least with a first metallic plane board, and a second metallic plane board being close to but not connected to the first metallic plane board to form the effect of capacitance in serial connecting. And more, the antenna structure further has an extension arm made from a microstrip extended from the antenna or the second metallic plane board, and can be optionally grounded or not grounded, for the purpose of adjusting the impedance value of the antenna structure.