Nonreversible Circuit Device Multi-Band Integration
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Solution Overview
Problem
Existing nonreversible circuit devices for mobile communication, such as circulators, require multiple components and tuners for impedance matching across various frequency bands, leading to increased cost and vulnerability to antenna-side load variations, which affect transmission-reception circuit stability.
Innovation Solution
A nonreversible circuit device comprising multiple high-pass type circulators with capacitance elements and filters, where the pass frequency bands are sequentially aligned, allowing for a combined antenna port and integrated filters to replace the need for a diplexer and tuner, thereby reducing component count and stabilizing operation across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diplexer and tuner are used to support multiple frequency bands, then the device can operate across multiple frequency bands, but the number of components and cost increase
Solution Approach 1:
The patent combines multiple circulators with different pass frequency bands into a single integrated device. The first circulator handles a first frequency band while the second circulator handles a second frequency band, and both share a common antenna port. This merging eliminates the need for separate diplexers and tuners for each frequency band, reducing component count while maintaining multi-band operation capability.
Solution Approach 2:
Each circulator in the patent is designed to perform multiple functions: they provide frequency-selective signal routing, impedance matching, and isolation for different frequency bands simultaneously. The circulators serve as universal components that replace what would traditionally require separate diplexers, tuners, and isolators for each frequency band, thereby reducing overall device complexity.
2Adaptability or versatility
If multiple circulators with different pass frequency bands are combined, then multi-frequency band operation is achieved, but interference between circulators may occur
Solution Approach 1:
The patent applies local quality by giving each circulator a distinct pass frequency band characteristic. The first circulator is optimized for its specific frequency band while the second circulator is optimized for a different frequency band. This frequency-selective design ensures that each circulator primarily processes signals within its designated band, minimizing interference between circulators while achieving broad frequency band coverage.
3Manufacturing precision
If traditional diplexer and tuner configuration is used, then impedance matching is achieved, but the transmission-reception circuit is vulnerable to antenna-side load variations
Solution Approach 1:
The circulators in the patent provide self-service impedance matching and load isolation functions. The inherent circulator structure with its isolated ports automatically maintains impedance matching without requiring external tuners, and the circulator's isolation property naturally protects the transmission-reception circuit from antenna-side load variations. This self-service capability enhances circuit stability while eliminating the need for additional impedance matching components.
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 enables operation across multiple frequency bands with reduced components and cost, while suppressing antenna-side load variations, thereby stabilizing the transmission-reception circuit and preventing interference between circulators with different frequency bands.
Implementation Method 1
a DC magnetic field is applied from a permanent magnet
Implementation Method 2
each circulator including a first central conductor, a second central conductor, and a third central conductor arranged on a microwave magnetic body
Data Source
AI summary
A nonreversible circuit device includes circulators of high pass type, each circulator including a first central conductor, a second central conductor, and a third central conductor arranged on a microwave magnetic body, to which a DC magnetic field is applied, in a relation intersecting each other in a mutually insulated state, and capacitance elements connected respectively in series between one end of the first central conductor and an antenna port, between one end of the second central conductor and a reception port, and between one end of the third central conductor and a transmission port. A pass frequency band of the circulator is lower than that of the circulator. The antenna ports of the circulators are electrically connected to provide one combined antenna port, and a low pass filter is inserted between the combined antenna port and the antenna port of the circulator.