Rotatable Patch Antenna for Circular Polarization Switching

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Solution Overview

Problem

Existing radio-frequency antennas lack the ability to efficiently switch between left-hand circular polarized (LHCP) and right-hand circular polarized (RHCP) signals without requiring complex electrical biasing or external power, limiting their adaptability in dynamic environments.

Innovation Solution

A microstrip patch antenna design featuring a rotatable corner truncated rectangular patch that can be manually configured for either RHCP or LHCP polarization by rotating the patch relative to a fixed feed, utilizing a capacitively coupled feed that does not contact the patch, allowing for polarization diversity without complex electrical components or actuators.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electronically tuned reconfigurable antennas using varactors, PIN diodes, or RF MEMS switches are used, then polarization and resonant frequency can be changed, but the device complexity and external power requirements increase

Engineering Contradiction:

Improvepolarization switching capabilityVSAvoidelectronic component complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces electronic tuning mechanisms (varactors, PIN diodes, RF MEMS switches) with a mechanical rotation system. The radiating patch is rotated manually or via actuator to change polarization, eliminating the need for complex electronic switching components while achieving the same adaptability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and removes the complex electronic biasing and power supply systems from the antenna structure. By using a mechanically rotatable patch without electronic tuning components, the design eliminates unnecessary complexity while retaining polarization reconfigurability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If mechanically reconfigurable antennas with actuators are used, then polarization can be changed, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvepolarization switching capabilityVSAvoidfabrication complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The antenna is segmented into a fixed feed structure and a rotatable radiating patch. This segmentation allows the patch to be independently rotated to change polarization without affecting the feed, simplifying the overall manufacturing process while maintaining reconfigurability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using electronic components to change polarization while keeping the structure fixed, the invention inverts the approach by making the radiating element itself rotatable. This mechanical inversion simplifies the structure by removing electronic tuning components and their associated manufacturing complexities.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of operation

If a capacitively coupled feed that does not contact the patch is used, then the patch can be rotated freely, but the feed structure becomes more complex

Engineering Contradiction:

Improvepatch rotatabilityVSAvoidfeed structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The capacitive coupling acts as an intermediary between the feed and the radiating patch. This intermediate coupling mechanism allows energy transfer without direct physical contact, enabling free rotation of the patch while maintaining a relatively simple feed structure through proximity coupling rather than mechanical connection.

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

Enables polarization diversity in a simple, cost-effective package with fewer structures, allowing for efficient excitation of various patch sizes and resonant frequencies, and can be easily reconfigured without external power, enhancing adaptability and reducing fabrication complexity.

Implementation Method 1

The feed capacitively couples to the patch without contacting the patch

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS11502415B2Mechanically reconfigurable patch antenna

Publication Date: 2022.11.15 THE MITRE CORPORATION

AI summary

A polarization configurable patch antenna including a radiating layer, wherein the radiating layer has a corner truncated rectangular patch shape; and a feed capacitively coupled to the radiating layer for exciting the radiating layer, wherein the radiating layer is rotatable with respect to the feed, and the antenna is configured to generate a right-hand circularly polarized radiation field when the radiating layer is in a first rotational position and a left-hand circularly polarized radiation field when the radiating layer is in a second rotational position.