Balanced PIFA Antenna with Segmented Grounding for Stability
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Solution Overview
Problem
In small-scaled antenna designs, the reduced grounding area leads to unstable grounding potential, affecting transmission quality due to environmental influences, necessitating a design that balances size and grounding stability.
Innovation Solution
A balanced Patched Inverse F (PIFA) antenna with a radiation conductor and a balun circuit, featuring a main body, branches, and a transformation circuit with serially connected components, providing a stable virtual ground and reducing noise, while minimizing the need for a large grounding area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the grounding area is downsized to reduce antenna size, then the antenna size is reduced, but the grounding potential becomes unstable due to environmental influences
Solution Approach 1:
The grounding system is segmented into multiple isolated grounding areas instead of a single large grounding area. Each grounding area is connected to the substrate through separate via holes, distributing the grounding function across multiple points. This segmentation allows the antenna to maintain compact size while achieving stable grounding potential through multiple distributed grounding points.
Solution Approach 2:
The grounding areas are nested within the antenna structure by utilizing the substrate and via holes to create compact grounding regions. The multiple grounding areas are arranged in a nested or compact configuration that minimizes overall antenna footprint while maintaining effective grounding coverage through vertical via connections to the substrate.
2Adaptability or versatility
If multiple antennas are placed on the same circuit board, then antenna versatility is improved, but leakage issues occur between antennas
Solution Approach 1:
Each antenna is equipped with its own segmented grounding areas and isolated feeding structures. The grounding areas of different antennas are electrically isolated from each other through separate via connections to the substrate, preventing signal leakage between antennas while allowing multiple antennas to coexist on the same circuit board.
Solution Approach 2:
The multiple grounding areas within each antenna are designed to achieve equipotential distribution through the substrate connection, creating a stable reference potential that prevents signal leakage to adjacent antennas. The via holes connect the grounding areas to the substrate at the same potential, eliminating potential differences that could cause leakage.
Data Source
AI summary
A balanced patched inverse F antenna comprises a radiation conductor and a balun circuit. The radiation conductor includes a main body, a first branch and a second branch. The balun circuit includes an unbalanced port, a balanced port, and first, second, third and fourth components, with the first, second, third and fourth components being serially connected. A feeding input of the unbalanced port is connected to the second and third components, a grounding wire of the unbalanced port is connected to the first and fourth components, an inverting terminal of the balanced port is connected to the first and second components, a non-inverting terminal of the balanced port is connected to the third and fourth components, and the inverting and non-inverting terminals are respectively connected to the first and second branches.