Distributed Power Amplifier with Integrated Antenna Impedance Matching
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Solution Overview
Problem
Power amplifier arrangements in mobile radios face increasing complexity and power loss due to the need for wide bandwidth and efficient impedance matching, particularly with the addition of more frequency bands, which is exacerbated by the use of discrete inductances and capacitances in transformation networks.
Innovation Solution
A distributed power amplifier arrangement with distributed antennas, where the antenna function is shared between multiple antennas and amplifiers, allowing for wider bandwidth and reduced power loss without the need for a matching network, achieved through the design of capacitive and inductive characteristics of the antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If transformation networks with discrete inductances and capacitances are used for impedance matching, then impedance matching between power amplifier and antenna is achieved, but power loss increases
Solution Approach 1:
The patent extracts and eliminates the discrete inductances and capacitances from the impedance matching network. Instead of using separate matching components, the antenna structure itself is designed to provide the necessary impedance transformation, thereby removing the power-lossy discrete components while maintaining matching functionality.
Solution Approach 2:
The antenna is designed to serve multiple functions simultaneously: it acts as both the radiating element and the impedance matching network. By integrating the matching function into the antenna structure, the patent eliminates the need for separate discrete matching components, reducing both power loss and device complexity.
2Adaptability or versatility
If multiple frequency bands are supported in mobile radios, then bandwidth increases, but the complexity of impedance transformation increases
Solution Approach 1:
The patent designs a universal antenna structure that can operate across multiple frequency bands while simultaneously providing impedance matching for all bands. This multi-functional design allows the system to support wider bandwidth without requiring separate matching networks for each frequency band, thereby reducing overall complexity.
Solution Approach 2:
The antenna structure is segmented into multiple resonant elements or configurations that can be independently tuned to different frequency bands. Each segment contributes to the overall impedance transformation, allowing broad bandwidth coverage while maintaining manageable complexity through modular design.
3Loss of energy
If discrete inductances and capacitances are used in transformation networks, then impedance matching is achieved, but device power loss increases
Solution Approach 1:
The patent removes discrete inductances and capacitances from the circuit, replacing them with an integrated antenna structure that provides impedance matching. This extraction eliminates the power losses associated with discrete components while maintaining manufacturing feasibility through standard antenna fabrication techniques.
Data Source
AI summary
A power amplifier arrangement having a distributed antenna is disclosed. The power amplifier arrangement has two or more signal paths which are coupled to a common input. Each signal path has an amplifier with a downstream antenna. The respective signal paths with the antenna are activated or deactivated by a control device as a function of the desired gain or output power. This results in high efficiency over a wide frequency range. The polar diagrams of the antenna branches preferably correspond to those of a single antenna.