Multi-Mode Antenna Beam Steering via Parasitic Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current antenna systems face challenges in optimizing link quality over wide frequency ranges and multipath environments, particularly in cellular communication systems, where interference and destructive interference reduce device performance, and existing modal antenna techniques require additional volume and components to operate across multiple frequency bands.
Innovation Solution
An active multi-mode antenna system that dynamically adjusts radiation patterns and correlation coefficients using a single parasitic element, with tunable components and unique topologies, allowing beam steering across multiple frequency bands and optimizing performance for both transmit and receive frequencies without increasing device volume or component complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are used for diversity schemes, then link quality and reliability are improved, but device volume and component complexity increase
Solution Approach 1:
The patent combines multiple antenna functions into a single modal antenna that can generate multiple radiation modes (TM110, TM101, TM210) by varying the reactive load on a parasitic element. This merging approach provides spatial and pattern diversity without requiring multiple physical antennas, thereby reducing device volume while maintaining link quality through mode switching diversity schemes
Solution Approach 2:
The single modal antenna is designed to perform multiple functions by generating different radiation modes for diversity reception, beam steering, and frequency band operation. The antenna system universally handles both transmit and receive operations across multiple frequency bands (e.g., 824-894 MHz and 1850-1990 MHz) using the same physical structure with reconfigurable parasitic loading
2Adaptability or versatility
If modal antenna technique is used for multi-frequency band operation, then bandwidth coverage is improved, but device volume and component count increase
Solution Approach 1:
The patent employs dynamic reconfiguration of the parasitic element loading to adapt the antenna's resonant frequencies and radiation patterns for different frequency bands. By varying the reactive load (inductive or capacitive) on the parasitic element, the system dynamically switches between frequency bands and radiation modes without requiring separate antennas for each band, thus maintaining compact size while achieving multi-band adaptability
Solution Approach 2:
The antenna system changes operational parameters (reactive load value, resonant frequency, radiation mode) to optimize performance across different frequency bands. The modal antenna structure allows parameter changes through electronic control of the parasitic element loading, enabling frequency aggregation and wideband operation without increasing physical dimensions
3Ease of operation
If reactive load is varied on parasitic element for beam steering, then radiation pattern control is improved, but device complexity increases
Solution Approach 1:
Beam steering is achieved by changing the reactive load parameter on the parasitic element, which modifies the current distribution and radiation pattern of the modal antenna. This parameter-based control method simplifies the system compared to mechanical steering or complex phased arrays, as it requires only electronic tuning of the parasitic loading to achieve beam direction control and mode switching
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 solution enhances communication system performance by reducing interference, optimizing radiation patterns, and maintaining high efficiency across multiple frequency bands, thereby improving link quality and reducing device size and component count.
Implementation Method 1
a single antenna is capable of generating multiple radiating modes; the contents of which are hereby incorporated by reference. In sum, this beam steering technique is effectuated with the use of a driven antenna and one or more offset parasitic elements that alter the current distribution on the driven antenna as the reactive load on the parasitic is varied
Data Source
AI summary
An active antenna system developed to beam steer at multiple frequency bands provides improved performance for fixed and mobile communication systems. Methods of altering the current mode on a single radiator are described wherein the radiation pattern of the antenna is varied as the antenna modes are altered. Techniques to restrict or expand the frequency bandwidth of the beam steering technique are described to provide the capability to beam steer at receive frequencies or transmit frequencies only, and techniques are described where beam steering can occur at both transmit and receive frequency bands from a single active antenna system.