Tri-band Antenna Assembly with Shorted Feed Points and LC Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Designing antennas for mobile wireless communications devices that provide desired operating characteristics within the limited space available while supporting multiple frequency bands such as Personal Communications Service (PCS), Advanced Mobile Phone System (AMPS), and Global Positioning System (GPS) bands is challenging.
Innovation Solution
A tri-band antenna assembly with a base conductor and two conductor arms, one tuned for the PCS band and the other for the AMPS band, incorporating an inductor-capacitor circuit for GPS band operation, is integrated into a portable housing, utilizing a flexible dielectric substrate to optimize space and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate antennas are used to support multiple frequency bands (PCS, AMPS, GPS), then frequency coverage is improved, but device size and component count increase
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna assembly that supports PCS, AMPS, and GPS frequency bands. The conductor structure includes multiple arms with specific geometries that resonate at different frequency bands simultaneously, eliminating the need for separate antennas for each band and reducing overall device volume.
Solution Approach 2:
The antenna assembly is designed as a universal structure that performs multiple functions across different frequency bands. The conductor arms are configured with specific length ratios and geometries to provide resonant frequencies for PCS (1.8-2.2 GHz), AMPS (824-894 MHz), and GPS (1.575 GHz) operations from a single integrated component.
2Adaptability or versatility
If multiple separate antennas are used for different frequency bands, then frequency diversity is improved, but PCB space and component count increase
Solution Approach 1:
The patent merges multiple antenna elements into a single integrated assembly where conductor arms of different lengths and configurations provide resonance at multiple frequency bands. This single assembly replaces what would traditionally require multiple separate antenna components, reducing PCB space requirements and overall component count while maintaining frequency diversity.
Solution Approach 2:
The antenna assembly is segmented into multiple conductor arms with specific length ratios (e.g., first arm approximately twice the length of the second arm) to create distinct resonant frequencies. Each arm segment contributes to a specific frequency band operation, allowing the single assembly to provide frequency diversity through its segmented structure.
3Volume of moving object
If antenna size is reduced to fit compact devices, then device portability is improved, but antenna performance and operating characteristics deteriorate
Solution Approach 1:
The patent applies local quality variations through different conductor arm geometries, lengths, and configurations within the compact antenna assembly. Each conductor arm has specific dimensional characteristics optimized for its intended frequency band operation, allowing the small overall structure to maintain appropriate electrical lengths and resonance properties for reliable performance across PCS, AMPS, and GPS bands.
Data Source
AI summary
A mobile wireless communications device may include a portable housing, at least one wireless transceiver carried by the portable housing, and at least one satellite positioning signal receiver carried by the portable housing. The device may also include an antenna assembly carried by the portable housing. The antenna assembly may include a base conductor having a pair of shorted antenna feed points defined therein and coupled to the at least one wireless transceiver and the at least one satellite positioning receiver, and a first conductor aim extending outwardly from the base conductor. The antenna assembly may also include a second conductor arm also extending outwardly from the base conductor. The second conductor arm may include a proximal conductor portion adjacent the base conductor, a distal conductor portion, and an inductor-capacitor circuit coupling the proximal and distal conductor portions.