Patch Antenna Cavity Structure for Wide-Angle Radiation

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Solution Overview

Problem

Conventional antenna devices using dielectric substrates face challenges in achieving wide-angle radiation directivity while maintaining miniaturization and reducing costs, as they require multiple antennas in an array and complex electronic circuits for beam forming.

Innovation Solution

An antenna device configured with a single patch antenna on a dielectric substrate, featuring a cavity above the patch antenna that expands radiation directionality, eliminating the need for multiple antennas and complex circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an array antenna with multiple antennas is configured on a dielectric substrate to achieve wide-angle radiation directivity, then the radiation directivity is improved, but the device size increases

Engineering Contradiction:

Improvewide-angle radiation directivityVSAvoiddevice size

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The invention transitions from a two-dimensional array configuration to a three-dimensional structure by forming a cavity below the patch antenna. This vertical dimension exploitation allows a single antenna to achieve wide-angle radiation directivity that traditionally required multiple antennas arranged in an array, thereby reducing the device footprint while maintaining radiation performance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The cavity structure is formed within the dielectric substrate below the patch antenna, creating a nested configuration where the cavity is embedded in the substrate. This nesting approach allows the radiation-enhancing structure to be integrated within the existing device volume rather than adding external components, thus achieving wide-angle radiation without increasing overall device size.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

Engineering Contradiction:

Improvewide-angle radiation directivityVSAvoidelectronic circuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the complex electronic beam forming circuits that are typically required for array antennas. By using a single patch antenna with a cavity structure, the system removes the need for phase shifters, amplifiers, and control electronics associated with multiple antenna elements, thereby significantly reducing device complexity while maintaining wide-angle radiation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cavity structure itself provides the radiation control function that would otherwise require external electronic circuits. The electromagnetic fields within the cavity naturally produce the wide-angle radiation pattern, making the system self-sufficient and eliminating the need for complex external beam forming electronics.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

Engineering Contradiction:

Improvewide-angle radiation directivityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention merges the antenna radiation function with the dielectric substrate structure by forming the cavity directly within the substrate material. This integration eliminates the need for separate antenna housings, mounting structures, and complex assembly processes required for array antennas, thereby reducing manufacturing costs while achieving wide-angle radiation directivity.

Inventive Principle:

Principle #5Merging (Combining)

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

Achieves wide-angle radiation directivity and cost reduction by utilizing a single patch antenna with a cavity, reducing size and assembly costs, and relaxing manufacturing tolerances.

Implementation Method 1

the radiation direction of radio waves radiated from the patch antenna via a feeding structure expands due to the influence of an electromagnetic field distribution on a dielectric surface which forms the side wall of the cavity located above the patch antenna

Methodology Applied

Scientific EffectElectromagnetic field distribution: Electromagnetic Induction

Data Source

PatentUS20260074425A1Antenna device

Publication Date: 2026.03.12 NITERRA CO LTD

AI summary

Provided is an antenna device which can achieve wide-angle radiation directivity, by using a single patch antenna, without causing an increase in the size of the device and an increase in the degree of complexity of its configuration, which increases would otherwise occur as a result of arraying a plurality of antennas. An antenna device configured by using a dielectric substrate includes a patch antenna formed in a predetermined conductor layer, a cavity formed in a dielectric layer disposed above the predetermined conductor layer and having a shape which encompasses the patch antenna in a plan view as viewed in a Z direction, which is the thickness direction of the dielectric substrate, and ground conductors disposed to face the dielectric layer in the Z direction with the predetermined conductor layer intervening therebetween.