Side-Frame Antenna Structure for Multi-Band Tuning in Compact Devices
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Solution Overview
Problem
The challenge lies in integrating full frequency antennas into smaller wireless communication device housings, where space constraints and the need for frequency adjustment complicate the reception and transmission of wireless signals across various frequency bands, such as LTE-A, without compromising performance.
Innovation Solution
The antenna structure employs a housing with a non-metallic backboard and a metal side frame, featuring a resonance circuit, matching circuits, and a switching circuit that divides the side frame into radiators and a coupling portion, allowing for impedance matching and mode adjustment across multiple frequency bands, including LTE low, middle, and high frequency bands, using capacitors and inductors to achieve efficient radiation and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full frequency antenna is used in smaller device housings, then wireless communication across multiple frequency bands is enabled, but the device size reduction becomes more difficult due to space constraints
Solution Approach 1:
The side frame is divided into multiple radiators (first radiator, second radiator, third radiator) that can be independently controlled through switching circuits. Each radiator can be activated or deactivated based on the required frequency band, allowing the antenna system to cover multiple frequency ranges while maintaining a compact form factor.
Solution Approach 2:
The antenna structure incorporates switching circuits that dynamically activate or deactivate specific radiators based on the operating frequency band. This dynamic configuration allows the same physical structure to adapt to different frequency requirements without requiring separate antennas for each band, thus reducing overall device size.
2Reliability
If single frequency antennas are added to smaller devices, then specific frequency reception is improved, but the transmitting and receiving frequencies of the full frequency antenna are affected
Solution Approach 1:
Different portions of the side frame are designed with different electrical lengths and impedance characteristics to optimize performance for specific frequency bands. The switching circuit selects which portion to activate based on the required band, ensuring optimal local matching for each frequency range while maintaining overall system versatility.
Solution Approach 2:
Matching circuits are introduced as intermediary components between the feed source and the radiators. These matching circuits adjust the impedance to ensure optimal power transfer and minimize reflections for each selected frequency band, thereby improving signal reception stability without compromising the full frequency capability.
3Adaptability or versatility
If the side frame is divided into multiple radiators with switching circuits, then impedance matching across multiple frequency bands is achieved, but the device complexity increases
Solution Approach 1:
The side frame serves multiple functions: it acts as both the device housing and the antenna structure. By integrating the antenna function into the existing side frame rather than adding separate antenna components, the design achieves multi-frequency capability while minimizing the increase in overall device complexity.
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 configuration enables the antenna structure to operate across a wide range of frequencies, including 4G LTE and GPS bands, maintaining stable signal reception and transmission while accommodating the design constraints of smaller device sizes, ensuring efficient radiation and a uniform appearance.
Implementation Method 1
a resonance circuit 13, a first matching circuit 14, a second matching circuit 15
Implementation Method 2
capacitors and inductors to achieve efficient radiation and reception
Implementation Method 3
featuring a resonance circuit, matching circuits, and a switching circuit that divides the side frame into radiators and a coupling portion, allowing for impedance matching and mode adjustment across multiple frequency bands
Data Source
AI summary
An antenna structure includes a housing, a first feed source, a second feed source, and a resonance circuit. The housing includes a first and a second radiator spaced to each other and grounded. The first feed source feeds current into the first radiator to activate a first mode, a second mode, and a third mode to generate radiation signals in a first frequency band, a second frequency band, and a third frequency band. The second feed source feeds current into the second radiator to activate a fourth mode to generate radiation signals in a fourth frequency band. The resonance circuit adjusts a radiation frequency band of the second radiator according to an impedance of the resonance circuit. The first radiator adjusts the third mode according to the radiation frequency band of the second radiator. A wireless communication device employing the antenna structure is also provided.