Antenna Device Asymmetric Receiving Element Arrangement
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Solution Overview
Problem
Conventional antenna devices experience a decrease in radio wave gain in wide angle directions deviated from the forward direction, limiting the effective transmission range.
Innovation Solution
The antenna device incorporates a transmitting antenna and a receiving antenna arranged on the rear surface, with the receiving element antennas symmetrically positioned at increasing distances orthogonal to the transmitting element antennas, enhancing gain in wide angle directions by optimizing the reflection and reception of radio waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the receiving antenna is arranged on the rear surface to increase forward direction gain, then the gain in the forward direction (0 degree) is improved, but the gain in wide angle directions deviated from the forward direction decreases
Solution Approach 1:
The receiving element antennas are arranged asymmetrically with respect to the transmitting element antennas. Specifically, the receiving element antennas are positioned at different distances from the transmitting element antennas, with at least one receiving element antenna arranged at a longer distance. This asymmetric arrangement creates different path lengths for reflected waves from different directions, enabling constructive interference in wide angle directions while maintaining forward direction gain.
Solution Approach 2:
Different receiving element antennas are positioned at different locations with different distances from the transmitting element antennas. This local variation in position allows each receiving element antenna to optimally receive reflected waves from specific directions, with the overall array achieving both forward direction and wide angle direction gain enhancement through coordinated local optimizations.
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 configuration significantly increases the gain in wide angle directions, allowing for more effective radio wave transmission over a broader range compared to conventional designs.
Implementation Method 1
a receiving antenna arranged, out of front and rear surfaces of the transmitting antenna, on a side of the rear surface where an observation target is not present, to receive a reflected wave of the radio wave reflected back by the observation target
Data Source
AI summary
Out of a plurality of receiving element antennas (2a) in a receiving antenna (2), with respect to one receiving element antenna (2acenter) as the center, the remaining receiving element antennas (2an) are arranged symmetrically, and with distance from the one receiving element antenna (2acenter), each of the remaining receiving element antennas (2an) is arranged to have a longer distance (Ln) to a position orthogonal to a straight line (A) passing through a position at which each of one or more transmitting element antennas (1a) is arranged.