Single-Ended Phase-Shift Network Lattice Topology
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Solution Overview
Problem
Existing phase-shift networks often have frequency cutoffs outside the bandwidth of interest, limiting their application in high-frequency coupling circuits and directional coupling applications.
Innovation Solution
A phase-shift network is designed using a lattice network with capacitors and inductors to create a modified lattice structure that includes coaxial or planar transmission lines, allowing for phase shift without altering the magnitude of the electrical signal, and is integrated into a phase-difference network to produce outputs with a constant phase difference over a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phase-shift networks are used, then phase shift function is achieved, but frequency cutoffs occur outside the bandwidth of interest
Solution Approach 1:
The phase-shift network is divided into multiple coupled sections (first coupled section, second coupled section) with a lattice network in between. Each section contributes to the overall phase shift while the distributed structure extends the bandwidth beyond conventional single-section designs, eliminating frequency cutoffs within the operating range.
Solution Approach 2:
The patent transitions from single-ended to double-ended configuration through the lattice network, adding a dimensional aspect to the signal path. This dimensional change enables broader bandwidth operation by utilizing both ends of the transmission lines for phase shift accumulation, pushing frequency cutoffs outside the bandwidth of interest.
2Ease of operation
If phase shift is achieved through conventional networks, then phase delay varies with frequency, but signal magnitude is altered
Solution Approach 1:
The lattice network acts as an intermediary structure between the coupled sections, providing a balanced configuration that introduces phase shift through its symmetrical inductor-capacitor arrangement. This intermediary structure ensures that magnitude remains constant while phase varies with frequency, as the lattice topology inherently provides equal signal paths for both differential modes.
3Adaptability or versatility
If lattice network with coupled sections is used, then ultra-wide bandwidth is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple transmission line sections into a unified lattice network structure. By combining the coupled sections with the lattice topology, the design achieves ultra-wide bandwidth while consolidating what would otherwise be separate components into an integrated circuit structure, managing complexity through functional integration.
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
The solution achieves ultra-wide bandwidth and high power-handling capability with reduced insertion loss and return losses, enabling efficient phase shifting across a broad frequency range while maintaining signal amplitude consistency.
Implementation Method 1
a phase-shift network provides phase shift or phase delay without appreciably altering the magnitude characteristic of the electrical signal passing through it
Implementation Method 2
the propagation delay of the phase-shift circuit varies with frequency
Implementation Method 3
The second conductor may be inductively coupled to the first conductor. Similarly, the fourth conductor may be inductively coupled to the third conductor
Data Source
AI summary
A phase-shift network may include a lattice network including a first capacitor coupling a first circuit node to a second circuit node, a second capacitor coupling a third circuit node to a fourth circuit node, and a first inductor coupling the first circuit node to the fourth circuit node. A first coupled section may couple a single-ended input node to the lattice network. A second coupled section may couple the lattice network to a single-ended output node. Each coupled section may include a plurality of conductors that may form a transmission line, such as a coaxial transmission line or a stripline. A high-pass circuit may couple the input node to the first coupled section. A phase difference network may include a signal divider producing two intermediate signals coupled to respective phase-shift networks producing output signals having substantially constant phase difference over a frequency range.