Distributed Gain Equalization Circuit for Millimeter Wave RF
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Solution Overview
Problem
High losses and dispersion at millimeter wave frequencies make gain equalization difficult, and lumped components introduce RF parasitic effects and in-band resonances, which are problematic for wideband operation.
Innovation Solution
A wideband distributed gain equalization circuit using transverse electromagnetic (TEM) line circuits and traces on a substrate to provide resistance, inductance, and capacitance without lumped components, eliminating the need for packaged resistors, inductors, and capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lumped components (resistors, inductors, capacitors) are used in gain equalization circuits, then the required spectral response can be realized, but RF parasitic effects and in-band resonances occur that detune the device and excite unwanted resonances over wide operating bands
Solution Approach 1:
The patent extracts and removes all lumped components (resistors, inductors, capacitors) from the gain equalization circuit. Instead of using discrete packaged components, the invention implements a fully distributed circuit using only transmission line structures (microstrip, stripline, or coplanar waveguide) that provide the necessary RLC characteristics through their distributed parameters, thereby eliminating RF parasitic effects and in-band resonances associated with lumped components
Solution Approach 2:
The patent merges the functions of separate lumped components (resistors, inductors, capacitors) into unified transmission line structures. The distributed RLC characteristics are achieved by carefully designing the transmission line geometry, width, spacing, and substrate properties, combining multiple functions into a single integrated distributed network that eliminates the need for discrete components
2Manufacturing precision
If distributed transmission lines and lumped components are used to provide gain equalization, then the required spectral response is achieved, but device complexity increases due to the combination of different component types and packaging requirements
Solution Approach 1:
The patent merges all circuit elements into a unified distributed transmission line structure. Instead of assembling multiple discrete components (resistors, inductors, capacitors) with different packaging requirements, the invention uses a single type of structure (microstrip, stripline, or coplanar waveguide) throughout, where the distributed RLC characteristics are achieved through geometric design parameters such as trace width, spacing, length, and substrate properties
Solution Approach 2:
The transmission line structures in the patent serve multiple functions simultaneously: they provide signal transmission, establish distributed resistance through conductor and dielectric losses, provide inductance through magnetic field storage, and provide capacitance through electric field storage. This multi-functionality eliminates the need for separate lumped components and simplifies the overall circuit architecture
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 solution provides a compensating gain slope to counteract negative gain slopes, reduces in-band resonances, and improves RF performance by leveraging the etch tolerance of printed circuit boards, leading to higher reliability, lower manufacturing costs, and wider temperature range operation.
Implementation Method 1
a plurality of transverse electromagnetic (TEM) line circuits disposed on the substrate layer
Implementation Method 2
The plurality of TEM line circuits are configured to provide at least one resistance, an inductance and a capacitance
Data Source
AI summary
Distributed gain equalization circuits for use with radio frequency (RF) devices are provided. The distributed gain equalization circuits include a substrate layer, multiple transverse electromagnetic (TEM) line circuits disposed on the substrate layer and multiple traces disposed on the substrate layer, each trace connected to one or more of the TEM line circuits. The traces and TEM line circuits are configured to provide resistances, inductances and capacitances to eliminate the need for lumped or packaged resistors, inductors and capacitors. The distributed gain equalization circuit operates at millimeter wave frequencies and provides a compensating gain slope to counteract a negative gain slope of the RF device. Methods of manufacturing distributed gain equalization circuits are also provided.