Antenna Array Signal Processing for Frequency Reconfigurability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna arrangements for mobile devices face challenges in achieving efficient frequency reconfigurability without separate matching circuits, leading to space constraints and power losses, and lack tunability for both low and high frequency bands, as well as adequate isolation between antenna elements.
Innovation Solution
An antenna arrangement comprising a signal processing device that generates feed signals for antenna elements based on complex weights, controlling frequency characteristics without the need for matching and decoupling networks, utilizing electromagnetic scattering to ensure precise control and optimization of antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate matching circuits are used for different frequency bands, then frequency reconfigurability is achieved, but device complexity and space requirements increase
Solution Approach 1:
A single matching circuit is designed to handle multiple frequency bands (low band and high band) through dynamic reconfiguration using PIN diodes, eliminating the need for separate matching circuits for each frequency band. The same physical circuit structure serves multiple functions by changing its electrical characteristics based on the operating frequency.
Solution Approach 2:
The matching circuit incorporates PIN diodes that can dynamically switch between different states (forward biased or reverse biased) to reconfigure the circuit's impedance characteristics. This dynamic reconfiguration allows the same circuit to be optimized for different frequency bands without physical changes or additional components.
2Adaptability or versatility
If multiple antennas are fitted on the same mobile device for MIMO operation, then communication performance is improved, but the volume available for each antenna is reduced
Solution Approach 1:
Multiple antenna elements are integrated into a compact array structure where they share common grounding and feeding mechanisms. The antenna elements are positioned in close proximity with optimized spacing to achieve MIMO functionality while minimizing the overall volume occupied by the antenna system.
3Volume of moving object
If antenna elements are placed closer to reduce device size, then space is saved, but isolation between antenna elements deteriorates
Solution Approach 1:
Decoupling networks are strategically placed between specific antenna elements to provide localized isolation where needed. The decoupling structures are positioned at critical coupling points between adjacent antenna elements, providing targeted interference cancellation without affecting the overall compact antenna array geometry.
4Object-generated harmful factors
If existing decoupling networks are used to increase isolation, then antenna element isolation is improved, but tunability of isolation is lost
Solution Approach 1:
The decoupling networks incorporate PIN diodes that can be dynamically controlled to adjust the isolation level between antenna elements. By changing the bias state of the PIN diodes, the decoupling structures can be tuned to provide optimal isolation for different operating conditions, frequency bands, or antenna configurations.
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 allows for predictable and efficient control of antenna array output, optimizing frequency characteristics and reducing power losses, while enabling independent tuning of both low and high frequency bands and improving isolation between antenna elements.
Implementation Method 1
The first complex weight and the second complex weight are based on an electromagnetic scattering between the first antenna element and the second antenna element
Data Source
AI summary
An antenna arrangement is described. The antenna arrangement comprises an antenna array that includes a first antenna element having a first feed point, and a second antenna element having a second feed point. The antenna arrangement further comprises a signal processing device configured to receive an input signal (Sin), obtain a first complex weight (w1), obtain a second complex weight (w2), generate a first feed signal (a1) based on the input signal (Sin) and the first complex weight (w1), generate a second feed signal (a2) based on the input signal (Sin) and the second complex weight (w2), provide the first feed signal (a1) to the first feed point, and provide the second feed signal (a2) to the second feed point so as to control the frequency characteristic of the antenna array. A method for such an antenna arrangement is also described.