Dual Antenna With Shared Feed Point For Compact Radio
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Solution Overview
Problem
In small-sized portable radio devices, internal antennas face challenges in minimizing space while operating across multiple frequency ranges, and achieving adequate isolation and matching between different frequency bands, especially when using small-sized chip components.
Innovation Solution
A dual antenna structure with two dielectric substrates and a shared feed point, where one partial antenna implements the lower operating band and the other the upper band, with independent tuning achieved through a short intermediate conductor without discrete matching components, allowing for efficient use of space and good isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If discrete matching components are used for independent tuning of different frequency bands, then tuning independence is achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple matching functions into a single shared feed structure. The feed impedance is designed to provide matching for both first and second frequency bands simultaneously, eliminating the need for separate matching components for each band. This merging approach maintains tuning independence while reducing device complexity and component count.
Solution Approach 2:
The shared feed structure serves multiple functions: it acts as the feeding mechanism for both antenna elements and simultaneously provides impedance matching for both frequency bands. The feed impedance is specifically designed to have matching properties across multiple bands, making the feed structure universal and multi-functional rather than requiring band-specific matching components.
2Manufacturing precision
If discrete matching components are used for independent tuning, then matching accuracy is improved, but manufacturing cost increases
Solution Approach 1:
By merging the matching function into the shared feed structure, the patent eliminates the need for additional discrete matching components. This reduces manufacturing steps, assembly operations, and component procurement costs while maintaining matching accuracy through the specifically designed feed impedance that provides matching for both frequency bands.
3Volume of moving object
If antenna elements are placed close together to minimize space, then space efficiency is improved, but isolation between frequency bands deteriorates
Solution Approach 1:
The patent uses a stacked configuration where two antenna elements are placed on opposite sides of a ground plane, effectively segmenting them in the vertical dimension. This spatial segmentation provides electromagnetic isolation between the elements operating at different frequency bands, reducing inter-band interference while maintaining compact overall volume.
Solution Approach 2:
The ground plane acts as an intermediary between the two antenna elements operating at different frequency bands. It provides electromagnetic shielding and isolation, preventing harmful interactions between the bands while allowing both elements to operate in close proximity, thus maintaining space efficiency without sacrificing isolation.
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 solution enables independent tuning of different operating bands without additional components, reducing space requirements and maintaining high efficiency, especially in the upper band, while minimizing production costs.
Implementation Method 1
Naturally, the higher the permittivity of the material, the smaller physically the antenna element having a certain electric size is.
Implementation Method 2
The first antenna element covers one portion of the top surface of the substrate and its one head surface. The second antenna element covers another portion of the top surface of the substrate and its other, opposing head surface.
Data Source
AI summary
A dielectric dual antenna (300) intended especially for small-sized radio apparatuses, with one partial antenna (310) of which is implemented the lower operating band of the antenna and with the second partial antenna (320) the upper operating band. The partial antennas have a shared feed point (FP) in the antenna structure, e.g. at the end of a radiating element (312) of one partial antenna, in which case the other partial antenna receives its feed galvanically through said radiating element by a short intermediate conductor (332). The partial antennas are located so that their substrates (311, 321) are heads face to face, and the main directions of the radiating elements i.e. the conductive coatings of the substrates starting from the shared feed point are opposing. The tunings of the partial antennas corresponding to different operating bands are obtained independent from each other without discrete matching components.