Complex Antenna Handling Dual Polarization via Switched Delay Lines
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Solution Overview
Problem
Existing antennas fail to efficiently handle both circularly and linearly polarized waves, leading to performance issues due to miniaturization effects when combining different types of antennas for satellite and ground communications.
Innovation Solution
A complex antenna design featuring a substrate with four helical antenna devices disposed at 90-degree intervals, delay lines of varying lengths, and switch modules that selectively connect the power feed terminal to the helical antenna devices to achieve phase displacement of 90 degrees, allowing the antenna to handle both circularly and linearly polarized waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monopole antenna is disposed in the vicinity of the center axis of a four-wire helical antenna to correspond to both circularly and linearly polarized waves, then the antenna can handle both polarizations, but miniaturization effects occur which are detrimental to antenna performance
Solution Approach 1:
The patent combines a monopole antenna and a four-wire helical antenna into a single integrated structure where the monopole antenna is positioned at the center of the helical antenna. This merging allows the antenna system to handle both circularly and linearly polarized waves simultaneously while avoiding the miniaturization effects that would occur if separate compact antennas were combined, as the integrated design maintains optimal performance characteristics of both antenna types.
2Reliability
If separate antennas are used for satellite communication (circularly polarized) and ground communication (linearly polarized), then each antenna can be optimized for its specific function, but the overall device size increases
Solution Approach 1:
The patent creates a universal antenna system where the four-wire helical antenna structure can handle both circularly polarized waves (for satellite communication) and linearly polarized waves (for ground communication). The monopole antenna component provides additional capability for linearly polarized wave reception. This multi-functional design eliminates the need for separate specialized antennas, thereby reducing overall device size while maintaining optimized performance for both communication types.
Data Source
AI summary
Provided is a complex antenna which corresponds to both a circularly polarized wave and a linearly polarized wave. The complex antenna includes a substrate, a power feed terminal, four helical antenna devices disposed on the substrate at intervals of 90 degrees, four delay lines having different lengths by a quarter wavelength, and four switch modules which are connected to the power feed terminal in common and each of which is connected to each helical antenna device and each delay line. Each switch module selects one of a first mode in which the power feed terminal and each helical antenna device are directly connected and a second mode in which each delay line is connected to each helical antenna device so that a phase of a power feed fed from the power feed terminal and propagated from each delay line to each helical antenna device can be sequentially shifted by 90 degrees.