Remote FM Antenna Architecture for Compact Cellular Phones
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Solution Overview
Problem
The compact form factor of cellular phones makes it challenging to integrate a suitable FM antenna, as the increased functionality required for modern phones, such as FM radio reception, necessitates larger antennas that cannot be accommodated within the phone's dimensions, often requiring external connections.
Innovation Solution
A cellular phone system that offloads FM signal processing to a remote device, using a wireless transceiver to receive and process intermediate frequency signals, which are then converted to baseband signals, allowing for integrated FM processing without the need for a large FM antenna within the phone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an FM receiver is integrated into the cellular phone, then the phone gains enhanced functionality, but the phone size increases due to the requirement for larger antenna dimensions
Solution Approach 1:
The patent extracts the FM antenna and low noise amplifier from the cellular phone body and places them in an external device (such as a headset or portable player). This allows the phone to maintain its compact size while still providing FM radio functionality through wireless communication with the external device.
Solution Approach 2:
The external device that contains the FM antenna and low noise amplifier serves multiple functions: it acts as both an FM radio receiver and a wireless communication device (using Bluetooth or other wireless standards) to connect with the cellular phone. This multi-functionality reduces the need for separate dedicated devices.
2Volume of moving object
If a suitable FM antenna is integrated within the cellular phone form factor, then the phone maintains compact dimensions, but the antenna cannot achieve suitable dimensions for effective FM signal reception
Solution Approach 1:
The FM antenna is extracted from the phone and placed in an external device that can be positioned closer to the user's ear or body, allowing for longer antenna elements that can effectively receive FM signals while keeping the phone itself compact.
Solution Approach 2:
The patent introduces a wireless communication interface (such as Bluetooth) as an intermediary between the FM antenna in the external device and the phone's audio processing. This allows the antenna to be physically separated from the phone while maintaining functional integration through wireless data transmission.
3Adaptability or versatility
If multiple antennas are added for different wireless functions, then the phone gains increased functionality, but the device complexity and physical space requirements increase
Solution Approach 1:
The patent combines the FM antenna with other wireless communication antennas in an external device. This external device handles multiple wireless functions (FM reception, Bluetooth communication, etc.) using a single integrated antenna system, reducing the total number of antennas needed in the overall system compared to having separate antennas in the phone for each function.
Data Source
AI summary
A cellular phone comprises a first wireless transceiver that receives baseband (BB) signals, which are based on frequency modulated (FM) signals that have been tuned and down-converted from a radio frequency (RF) to the BB by a remote device. An FM processing module receives the BB signals and generates processed FM signals based on the BB signals.