Zig-Zag Antenna Array for Switchable RF Polarization Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phased array line feed antennas are sensitive to signal fading due to changes in polarization orientation, particularly in handheld or mobile devices and satellite communication systems, and require a compact antenna structure that can switch between vertical, horizontal, and circular polarizations to maintain effective communication.
Innovation Solution
A zig-zag antenna array with conductive disk stacks and crossed zig-zag antennas, coupled with a control circuit to switch between polarization states, allowing for the transmission and reception of radio frequency waves with vertical, horizontal, elliptical, or circular polarization, while phase compensation electronics adjust the spacing of conductive disks for size and performance constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a phased array line feed antenna is used, then electronic beam steering capability is achieved, but the antenna becomes susceptible to signal fading due to polarization changes
Solution Approach 1:
The patent implements a dual-polarized phased array antenna system that can simultaneously handle both vertical and horizontal polarizations. The antenna includes two sets of radiating elements oriented orthogonally to each other, allowing it to transmit and receive signals in both polarization modes. This multi-functional capability eliminates signal fading caused by polarization mismatch while maintaining electronic beam steering through phase shifters.
2Volume of moving object
If the antenna structure is made compact, then space constraints are satisfied, but polarization switching capability and beam directionality are compromised
Solution Approach 1:
The patent employs a nested structure where multiple functional components are integrated within a compact form factor. The dual-polarized radiating elements are positioned in close proximity with orthogonal orientations, and the phase shifters are integrated directly with the antenna elements. This nesting approach maintains full polarization switching capability and beam directionality while significantly reducing the overall antenna volume.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of the dual-polarized elements to achieve compactness without sacrificing functionality. By orienting elements in orthogonal directions (vertical and horizontal dimensions) and arranging them in a stacked configuration, the antenna achieves polarization diversity and beam steering capability within a reduced footprint, effectively adding dimensional efficiency to the design.
3Reliability
If polarization switching is added to maintain communication integrity, then signal fading is reduced, but device complexity increases
Solution Approach 1:
The patent combines the polarization switching function with the beam steering control by integrating phase shifters that can simultaneously control both the polarization state and the beam direction. The control system merges the polarization switching logic with the beam forming algorithms, allowing a single control architecture to manage both functions without requiring separate complex control circuits for each.
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
The zig-zag antenna array provides high sensitivity and broad areal coverage, enabling flexible polarization control and beam directionality, effectively addressing signal fading issues and supporting modern communication systems like 5G by maintaining communication integrity across varying polarization orientations.
Implementation Method 1
In transmission mode, the radio transmitter supplies an electric current to antenna terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves)
Implementation Method 2
The control circuit is coupled to the element pair to switch the crossed zig-zag antenna segment pairs to drive the crossed zig-zag antenna segment pairs to transmit or receive radio frequency (RF) waves with polarization states that include vertical, horizontal, elliptical, or circular polarization
Data Source
AI summary
An example antenna system includes a zig-zag antenna array. The zig-zag antenna array includes a stack of conductive disks and at least one crossed zig-zag antenna extending through the stack of conductive disks. The at least one crossed zig-zag antenna includes an element pair that includes a plurality of crossed zig-zag antenna segment pairs between the stack of conductive disks. A respective crossed zig-zag antenna segment pair extends between a respective lower conductive disk and a respective upper conductive disk. The example antenna system further includes a control circuit coupled to the element pair to switch the crossed zig-zag antenna segment pairs to drive the crossed zig-zag antenna segment pairs to transmit or receive radio frequency (RF) waves with polarization states that include vertical, horizontal, elliptical, or circular polarization.