Multiband Hybrid Antenna for Handheld Devices
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Solution Overview
Problem
Designing a compact antenna that can effectively cover multiple frequency bands for handheld electronic devices is challenging due to their mobile nature and the need for simultaneous communication across various wireless communications bands.
Innovation Solution
A hybrid antenna is created using a conductive structure with an L-shaped resonating element near-field coupled to an antenna slot, allowing it to function as both a non-radiating coupling stub for lower frequency bands and a monopole antenna for higher frequency bands, enabling coverage across multiple communications bands such as GPS and WiFi/Bluetooth frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact antenna design is used to reduce device size, then the form factor is improved, but the ability to cover multiple frequency bands deteriorates
Solution Approach 1:
The L-shaped resonating element is designed to perform multiple functions across different frequency bands. At lower frequencies (e.g., GPS at 1575 MHz), it acts as a non-radiating coupling stub that excites the slot antenna. At higher frequencies (e.g., WiFi/Bluetooth at 2.4 GHz), it functions as a radiating monopole antenna. This multi-functionality allows a single compact structure to cover multiple frequency bands effectively.
Solution Approach 2:
The antenna structure dynamically changes its operating mode depending on the frequency of the incident signal. The L-shaped resonating element transitions between two distinct operational states: a non-radiating coupling mode at lower frequencies and a radiating monopole mode at higher frequencies. This dynamic behavior enables the antenna to adapt its characteristics to match different frequency requirements within the same compact form factor.
2Adaptability or versatility
If multiple separate antennas are used to cover different frequency bands, then frequency band coverage is improved, but device complexity and size increase
Solution Approach 1:
The invention merges the functionality of multiple separate antennas into a single hybrid antenna structure. The L-shaped resonating element combined with the slot antenna creates a unified structure that integrates both the coupling stub function (for lower frequencies) and the monopole antenna function (for higher frequencies). This consolidation reduces the number of separate antenna components needed while maintaining comprehensive frequency band coverage.
Solution Approach 2:
The hybrid antenna structure is designed as a universal solution that can handle multiple frequency bands through a single integrated design. The L-shaped resonating element serves dual purposes: coupling to the slot at lower frequencies and radiating at higher frequencies, eliminating the need for separate specialized antennas for each frequency band.
3Ease of manufacture
If traditional antenna designs are used, then manufacturing simplicity is maintained, but the ability to achieve compact multiband operation deteriorates
Solution Approach 1:
The antenna is segmented into distinct functional portions: the L-shaped resonating element and the slot antenna portion. These segments can be independently designed and optimized for their specific functions while being manufactured using standard PCB fabrication techniques. The L-shaped element can be created through conventional metal layer patterning or foil stamping processes, maintaining manufacturing simplicity.
Solution Approach 2:
Different portions of the antenna structure are designed with locally optimized characteristics. The L-shaped resonating element has specific geometric properties optimized for coupling at lower frequencies, while the slot antenna portion is optimized for radiating at higher frequencies. This local optimization allows each segment to perform its function effectively while maintaining overall compactness and manufacturability.
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 hybrid antenna effectively receives and transmits signals across multiple frequency bands, reducing the size and complexity of handheld devices while minimizing radio-frequency interference between antennas.
Implementation Method 1
The L-shaped antenna resonating element may be near-field coupled to the antenna slot. In the first communications band, the L-shaped antenna resonating element may serve as a non-radiating coupling stub that excites the antenna slot.
Implementation Method 2
In the second communications band, the L-shaped antenna resonating element may act as a monopole antenna that is used to transmit and receive radio-frequency signals.
Data Source
AI summary
A handheld electronic device is provided that contain wireless communications circuitry. The wireless communications circuitry may include antenna structures. A first antenna may handle first and second communications bands. A second antenna may handle additional communications bands. The first and second antennas may be located at opposite ends of the handheld electronic device. Conductive structures in the handheld electronic device may form an antenna ground plane. The antenna ground plane may have portions defining an antenna slot. An L-shaped antenna resonating element may be located adjacent to the slot. In the first communications band, the L-shaped antenna resonating element may serve as a non-radiating coupling stub that excites the antenna slot. In the second communications band, the L-shaped antenna resonating element may transmit and receive radio-frequency signals.