Planar Antenna Device for Portable TV Signal Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional small-size TV antennas face challenges in receiving both VHF and UHF TV signals due to size constraints, making it impossible to design a standard antenna for portable devices that can effectively cover both frequency bands.
Innovation Solution
A planar antenna device with a loop antenna, tuning means, ground plane, coupling means, amplification means, and switching means that can selectively receive and amplify VHF and UHF signals, allowing for independent control and delivery of TV signals based on command signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit portable devices, then the device size is reduced, but the ability to receive VHF signals is lost
Solution Approach 1:
The antenna is divided into two distinct structures: a first antenna element for UHF signals and a second antenna element for VHF signals. Each element is optimized for its specific frequency band, allowing the compact antenna assembly to receive both VHF and UHF signals effectively in portable devices
Solution Approach 2:
The antenna device incorporates multiple antenna elements that can operate across different frequency bands (VHF and UHF), making it a universal solution for receiving television signals in portable equipment with limited space
2Reliability
If a quarter wavelength antenna is used for VHF signals, then good signal reception is achieved, but the antenna size becomes too large for portable devices
Solution Approach 1:
The antenna system separates VHF and UHF reception into distinct elements, allowing the VHF element to be optimized for its frequency band while the overall antenna structure remains compact enough for portable devices
Solution Approach 2:
The antenna elements are arranged in a planar configuration with specific geometric relationships, utilizing two-dimensional space efficiently to achieve the required electrical lengths for both VHF and UHF operation without increasing the device's overall footprint
Data Source
AI summary
A planar antenna device (AD) for a TV receiver (R) comprises i) a loop antenna (LA) comprising first (E1) and second (E2) ends spaced one from the other, ii) a tuning means (TM) connected to the first (E1) and second (E2) ends of the loop antenna (LA) and arranged to control the frequency of the VHF TV signals this loop antenna (LA) is able to receive from command signals, iii) a first ground plane (GP1) cooperating with the loop antenna (LA) in order to act as a UHF monopole in receiving TV signals with UHF frequencies, iv) a first coupling means (CM1) coupled to the loop antenna (LA) at a first chosen location and arranged to deliver the received VHF signals, v) a second coupling means (CM2) coupled to the loop antenna (LA) at a second chosen location and arranged to deliver the received UHF signals, vi) an amplification means (AM) coupled to the first ground plane (GP1) and arranged to amplify TV signals, and vii) a switching means (SM) arranged to couple the amplification means (AM) to the first coupling means (CM1) and/or to the second coupling means (CM2) in dependence on command signals in order that the amplification means deliver amplified selected TV signals with VHF and/or UHF frequencies to an output.