Antenna Switching for Mobile Phone and DTV Interference
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Solution Overview
Problem
Existing wireless communication apparatuses, such as mobile phones, face interference issues when transmitting and receiving signals in the 800 MHz band due to proximity to digital television broadcasting frequencies, leading to poor reception characteristics for television broadcasts.
Innovation Solution
The apparatus employs dual antenna elements and matching/filter circuits to selectively route signals, ensuring that the second antenna element is used for receiving digital television signals when the signal level falls below a threshold, thereby minimizing interference from mobile phone transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna element is used for both mobile phone transmission and digital television reception, then the device complexity is reduced, but the reception characteristics for digital television broadcasts deteriorate due to interference from mobile phone transmitting signals
Solution Approach 1:
The antenna system is segmented into a first antenna element for mobile phone communication and a second antenna element for digital television reception. This segmentation allows each antenna to be optimized for its specific function, preventing interference between the two communication systems while maintaining overall system simplicity.
Solution Approach 2:
The first antenna element serves dual functions by being used for both transmitting mobile phone signals and receiving digital television broadcasts when not transmitting. The switching mechanism enables this multi-functionality, allowing the antenna to be shared between two different communication modes without requiring completely separate hardware for each function.
2Adaptability or versatility
If the mobile phone transmits signals in the 800 MHz band, then mobile phone communication functionality is maintained, but digital television broadcast reception is disturbed due to frequency proximity
Solution Approach 1:
A switching mechanism acts as an intermediary between the antenna elements and the receiving circuits. This mediator dynamically routes signals based on the operational mode, ensuring that when the mobile phone transmits, the second antenna element is connected to the digital television receiving circuit, thereby preventing transmission interference from affecting television reception.
Solution Approach 2:
The antenna system dynamically switches between different configurations based on the operational state. When the mobile phone is transmitting, the system switches to use the second antenna element for digital television reception. This dynamic adaptation allows the system to maintain both mobile phone communication functionality and digital television reception quality simultaneously.
3Device complexity
If a single antenna element is shared between transmission and reception, then the number of components is reduced, but the signal reception quality deteriorates when transmission is occurring
Solution Approach 1:
The receiving system is segmented into two independent receiving circuits: one for mobile phone signals and one for digital television broadcasts. Each receiving circuit is paired with its dedicated antenna element, allowing simultaneous reception of both signal types without mutual interference, while the switching mechanism manages the transmission path.
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 allows for simultaneous and interference-free transmission and reception of mobile phone signals and digital television broadcasts by dynamically switching antenna usage based on signal strength, enhancing reception quality.
Implementation Method 1
first filter means passing a radio signal in the first frequency band, second filter means passing a radio signal in the first frequency band, third filter means passing a radio signal in the third frequency band, fourth filter means passing a radio signal in the second frequency band
Implementation Method 2
The first matching means matches an impedance of the first antenna element to an impedance of the first filter means in the first frequency band, the second matching means matches an impedance of the second antenna element to an impedance of the second filter means in the first frequency band
Implementation Method 3
third matching means for matching an impedance of the first antenna element to an impedance of third filter means in the third frequency band, fourth matching means for matching an impedance of the second antenna element to an impedance of fourth filter means in the second frequency band
Data Source
AI summary
A portable wireless communication apparatus is provided with antenna elements; a mobile phone signal processing circuit; a DTV tuner for receiving DTV low-band frequency signals and DTV high-band frequency signals; impedance matching circuits for the mobile phone signal processing circuit; and impedance matching circuits for the DTV tuner for receiving the DTV low-band frequency signals and DTV high-band frequency signals. A switch is changed to select either the DTV low-band frequency signals or the DTV high-band frequency signals, and output the selected signals to the DTV tuner. A tuner controller controls the switch to select the DTV high-band frequency signals by using the antenna element for transmission from the mobile phone signal processing circuit.