Differential Antenna Balun Layout for Compact Symmetric Feeding
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Solution Overview
Problem
Conventional dual-feed antennas face challenges in miniaturization due to the requirement for large space for external feed signal lines, which complicates achieving good field symmetry and performance.
Innovation Solution
An antenna device incorporating a multi-layer structured balun and a differential antenna, where the balun converts single-ended and double-ended signals efficiently, maintaining field symmetry and performance without additional wiring for double-ended signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional dual-feed antenna uses external feed signal lines for good field symmetry, then the field symmetry is improved, but the space requirement increases making miniaturization difficult
Solution Approach 1:
The patent merges the balun and antenna into a single integrated structure where the balun's radiation arms are directly formed as part of the antenna radiator. This integration eliminates the need for separate external feed signal lines while maintaining the dual-feed functionality, thereby achieving good field symmetry without increasing space requirements.
Solution Approach 2:
The balun structure performs multiple functions: it provides impedance transformation between single-ended and differential signals, serves as the feed mechanism for the antenna, and its radiation arms directly function as the antenna radiator. This multi-functionality eliminates the need for separate components and reduces overall space requirements.
2Area of stationary object
If the antenna is miniaturized to reduce space, then the space requirement is reduced, but achieving good field symmetry becomes difficult
Solution Approach 1:
By integrating the balun and antenna into a compact unified structure, the patent achieves miniaturization while the symmetrical arrangement of the radiation arms ensures good field symmetry is maintained despite the reduced size.
Solution Approach 2:
The patent uses symmetrical design principles where the radiation arms are arranged symmetrically with respect to the feed line, ensuring balanced current distribution and good field symmetry even in the miniaturized configuration.
3Stability of the object's composition
If external feed signal lines are used for dual-feed antenna, then good field symmetry is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the feed mechanism and radiating elements into a single integrated balun-antenna structure, eliminating the need for separate external feed signal lines and reducing configuration complexity while maintaining dual-feed functionality and field symmetry.
Data Source
AI summary
An antenna device includes a differential antenna and a first balun. The differential antenna includes a first radiator, a first antenna port and a second antenna port connected to a first surface of the first radiator. Orthographic projections of the first antenna port and the second antenna port projected to the first radiator are symmetrical to a midpoint of the first radiator. The first balun is located on one side of the first surface of the first radiator, and its orthographic projection on the first plane where the first surface is located overlaps the first surface. The first balun includes a first port, a first wiring, a first coupling structure electrically connected to the first antenna port, and a second coupling structure electrically connected to the second antenna port. Neither the first coupling structure nor the second coupling structure directly contacts the first wiring.