Broadband Antenna Coupling Layout for Compact Multi-Band Devices
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Solution Overview
Problem
Portable devices like smartphones and tablets face challenges in designing antenna systems with broad bandwidth due to limited space, making it difficult to cover multiple non-adjacent frequency bands effectively, especially with traditional antenna designs that conflict with industrial design aesthetics and require large volumes.
Innovation Solution
The implementation of a wide-band antenna system that fits within a small form factor, utilizing a low frequency antenna and two high frequency antennas configured to operate across multiple frequency bands, with capacitive coupling and adjustable capacitors to achieve dual-loop mode operation and independent resonances, allowing for carrier aggregation and MIMO capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna designs are used to cover multiple non-adjacent frequency bands, then bandwidth coverage is improved, but device volume and structural complexity increase
Solution Approach 1:
The patent implements a universal antenna system where a single antenna structure can operate across multiple non-adjacent frequency bands (e.g., 700 MHz, 1.9 GHz, 2.6 GHz, 3.5 GHz, and 5 GHz bands) by using voltage-controlled switches to reconfigure the antenna's electrical length and impedance characteristics, eliminating the need for separate antennas for each frequency band
Solution Approach 2:
The antenna system employs dynamic reconfiguration capabilities through voltage-controlled switches (SPDT or SP3T types) that can change the antenna's electrical characteristics in real-time based on the required frequency band, allowing the same physical structure to adapt to different operating conditions without manual intervention
2Adaptability or versatility
If multiple separate antennas are used to cover different frequency bands, then frequency band coverage is improved, but isolation between antennas deteriorates
Solution Approach 1:
By using a single universal antenna structure instead of multiple separate antennas, the patent eliminates the isolation problems between adjacent antennas while maintaining the ability to cover multiple frequency bands through electronic reconfiguration, achieving both broad coverage and excellent isolation simultaneously
3Volume of moving object
If narrow-banded tunable antennas are used to fit limited space, then device compactness is improved, but bandwidth coverage deteriorates
Solution Approach 1:
The patent combines compact physical dimensions with dynamic electrical reconfiguration capabilities, allowing a small antenna structure to achieve broad frequency coverage by changing its electrical length and impedance characteristics through voltage-controlled switches, thus breaking the trade-off between size and bandwidth
4Adaptability or versatility
If traditional wide-band antenna designs are implemented, then bandwidth coverage is improved, but device aesthetic design deteriorates
Solution Approach 1:
The patent uses a compact universal antenna structure that can be seamlessly integrated into the device housing or back cover, providing broad frequency coverage without compromising the device's aesthetic design, as the antenna does not require large visible structures or complex external 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 enables efficient coverage of multiple frequency bands with good isolation, achieving reflection coefficients of less than −6 dB and isolation levels greater than −15 dB, supporting LTE-Advanced carrier aggregation and MIMO without compromising device aesthetics or increasing volume.
Implementation Method 1
The first antenna is coupled to the second antenna and the third antenna through capacitive coupling elements
Implementation Method 2
configured to operate across multiple frequency bands, with capacitive coupling and adjustable capacitors to achieve dual-loop mode operation and independent resonances
Data Source
AI summary
Techniques are disclosed for configuring a broadband antenna system. An example electronic device includes a first antenna operating at a first frequency range and coupled to a first transceiver via a first signal path comprising a first indirect feed. The electronic device also includes a second antenna operating at a second frequency range and coupled to a second transceiver via a second signal path comprising a second indirect feed, wherein the first frequency range is lower than the first frequency range. The electronic device also includes a third antenna operating at the second frequency range and coupled to a third transceiver via a second signal path comprising a third indirect feed. Additionally, the first antenna is coupled to the first antenna and the second antenna by a capacitive coupling element.