Antenna Apparatus With Fixed VHF And Switchable UHF Antennas
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Solution Overview
Problem
Existing antenna systems face challenges in miniaturization and simplification due to the need to accommodate both VHF and UHF signal reception, with smart antennas becoming larger to switch directivity for various transmission tower directions, but with reduced VHF broadcasting, the need for VHF directivity switching decreases.
Innovation Solution
An antenna system comprising a fixed directivity VHF antenna and a detachable UHF antenna capable of switching directivity, with a control unit that acquires channel information to select the appropriate antenna and adjust UHF antenna directivity based on channel information, allowing efficient control and miniaturization by eliminating the need for VHF directivity switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a smart antenna is configured to switch directivity for both VHF and UHF signal reception, then the antenna can receive signals from multiple transmission tower directions, but the antenna size becomes enlarged
Solution Approach 1:
The antenna system is divided into two separate antennas: a first antenna for VHF signal reception and a second antenna for UHF signal reception. This segmentation allows each antenna to be optimized for its specific frequency band, with the second antenna having directivity switching capability while the first antenna has fixed directivity, thereby reducing overall system size while maintaining versatility
Solution Approach 2:
Different parts of the antenna system have different functional properties: the first antenna is designed with fixed directivity appropriate for VHF signals, while the second antenna is designed with directivity switching capability appropriate for UHF signals. This local differentiation eliminates the need for the first antenna to have unnecessary directivity switching functionality, reducing its size
2Adaptability or versatility
If a smart antenna is configured to switch directivity for VHF signal reception, then the antenna can receive VHF signals from multiple directions, but the antenna complexity increases
Solution Approach 1:
The directivity switching functionality is extracted from the first antenna and assigned only to the second antenna. The first antenna is simplified to have fixed directivity, removing unnecessary complexity while the second antenna handles all directivity switching requirements for UHF signals
Solution Approach 2:
Instead of making one antenna handle both VHF and UHF with full directivity switching capability, the invention inverts the approach by making the first antenna simple with fixed directivity and the second antenna complex with switching capability, optimizing the overall system
3Device complexity
If a single antenna is used for both VHF and UHF signal reception, then the antenna system is simplified, but the antenna cannot be optimized for specific frequency bands
Solution Approach 1:
The antenna system is segmented into frequency-specific antennas: the first antenna is optimized for VHF band reception and the second antenna is optimized for UHF band reception. This segmentation allows each antenna to be specifically designed and optimized for its target frequency band while maintaining overall system manageability
Data Source
AI summary
Disclosed is an antenna apparatus including: a first antenna (12) having a fixed directivity for receiving a signal in a first frequency band; a second antenna (13) capable of switching a directivity thereof at a time of receiving a signal in a second frequency band; a judgment section (1113b) to judge which of the signal in the first frequency band and the signal in the second frequency band a television broadcast signal corresponding to a tuned channel is; and a selection section (1113c) to select the first antenna as an antenna to receive the television broadcast signal corresponding to the tuned channel when the television broadcast signal is judged to be the signal in the first frequency band, and to select the second antenna as the antenna to receive the television broadcast signal when the television broadcast signal is judged to be the signal in the second frequency band.