Active RF Duplexing Circuit With FIR Isolation on a Single Antenna
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radio frequency (RF) diplexers are limited by high cost, size, and weight due to reliance on high-Q frequency selective filters and ferrite structures, and suffer from narrow tunability and intrinsic losses, failing to provide effective isolation and flexibility for high-power RF transmission and reception across multiple octaves.
Innovation Solution
An active electronic circuit with a distributed amplifier topology and tunable gain cells, configured as a finite impulse response (FIR) filter, allows for wideband RF duplexing, enabling high-power signal isolation and flexible frequency operation, integrated on a single chip, using passive mixers for noise reduction and output resistance tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-Q frequency selective filters are used to provide isolation, then isolation between transmitter and receiver is improved, but cost, size, and weight increase
Solution Approach 1:
The patent replaces mechanical/ferrite-based isolation structures with an electronic system using circulator and amplifier components. The active electronic circuit substitutes for passive high-Q filters and ferrite structures, achieving isolation through electronic signal processing rather than physical barrier mechanisms.
Solution Approach 2:
The invention changes the operating parameters by using active amplification with gain control to achieve isolation. The system dynamically adjusts amplifier gain and uses circulator isolation characteristics to provide transmitter-receiver isolation without relying on fixed high-Q filter parameters, enabling adaptive isolation across frequency bands.
2Object-affected harmful factors
If high-Q frequency selective filters are used to provide isolation, then isolation between transmitter and receiver is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical/ferrite-based isolation structures with an electronic system using circulator and amplifier components. The active electronic circuit substitutes for passive high-Q filters and ferrite structures, achieving isolation through electronic signal processing rather than physical barrier mechanisms.
3Object-affected harmful factors
If ferrite structures such as circulators are used, then isolation between transmitter and receiver is improved, but cost, size, and weight increase
Solution Approach 1:
The patent replaces mechanical/ferrite-based isolation structures with an electronic system using circulator and amplifier components. The active electronic circuit substitutes for passive high-Q filters and ferrite structures, achieving isolation through electronic signal processing rather than physical barrier mechanisms.
4Object-affected harmful factors
If electrical balance with high-Q transformers is used, then isolation between transmitter and receiver is improved, but adaptability and tunability are reduced
Solution Approach 1:
The patent implements dynamic gain control in the amplifier stages, allowing the system to adapt to different frequency bands and operating conditions. The gain cells can be reconfigured via control signals to optimize performance across wide frequency ranges, providing dynamic adaptability that static transformer-based systems cannot achieve.
Solution Approach 2:
The invention changes the operating parameters by using active amplification with gain control to achieve isolation. The system dynamically adjusts amplifier gain and uses circulator isolation characteristics to provide transmitter-receiver isolation without relying on fixed high-Q filter parameters, enabling adaptive isolation across frequency bands.
5Object-affected harmful factors
If resonant transformer structures are used for signal cancellation, then isolation between transmitter and receiver is improved, but energy loss increases
Solution Approach 1:
The patent replaces passive resonant transformer cancellation structures with an active electronic system using circulator and amplifier components. The active electronic circuit substitutes for passive high-Q filters and ferrite structures, achieving isolation through electronic signal processing rather than physical barrier mechanisms.
Data Source
AI summary
An active electronic device that enables bidirectional communication over a single antenna or path is disclosed. The device may be characterized by a forward path (from an input to an antenna port) offering high gain, and a reverse path (to a receiver port) that can be configured as an finite impulse response (“FIR”) filter. An amplifier of the device is disclosed, the amplifier allowing for tuning of output resistance using passive mixers.