Folded Antenna Impedance Tuning via Width Adjustment
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Solution Overview
Problem
Existing folded antennas face a trade-off where adjusting impedance to secure performance can lower gain characteristics, necessitating a solution that maintains high gain while stabilizing input impedance without altering the height dimension.
Innovation Solution
A compact and low-profile folded antenna design that adjusts impedance by varying the width dimension of the folded portion without changing the height of the bent portion, utilizing a substrate with a dielectric base and capacitive coupling to the ground, allowing for stable input impedance and high gain in the vertical polarization/horizontal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height dimension is changed to adjust impedance, then the impedance performance is improved, but the gain characteristic is lowered
Solution Approach 1:
The patent changes the parameter being adjusted from height dimension to width dimension of the folded portion. By modifying the width of the folded portion, the impedance is adjusted without altering the height dimension, thus avoiding the loss of gain characteristic while achieving the desired impedance performance.
Solution Approach 2:
The patent transitions from adjusting the vertical dimension (height) to adjusting the horizontal dimension (width of folded portion). This dimensional shift allows impedance tuning without compromising the vertical radiation efficiency that determines gain characteristic.
2Power
If the height dimension is increased to maximize gain, then the gain in vertical polarization is improved, but the antenna profile is increased
Solution Approach 1:
The patent utilizes the horizontal dimension (width of folded portion) to achieve impedance adjustment, allowing the vertical dimension (height) to be optimized for gain without compromising impedance performance. This enables a low-profile design with high gain capability.
3Reliability
If the width dimension of the folded portion is adjusted, then the impedance is stabilized, but the area of the folded portion is changed
Solution Approach 1:
The patent deliberately changes the width parameter of the folded portion to adjust and stabilize the input impedance. The area change is an acceptable trade-off to achieve the primary goal of impedance stabilization while maintaining high gain through preserved height dimension.
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 design effectively stabilizes input impedance and maintains high gain in the folded antenna by adjusting the width of the folded portion, ensuring optimal performance without increasing the antenna's height, as demonstrated by the voltage standing wave ratio frequency characteristics.
Implementation Method 1
a folded portion further bent in a direction parallel to the substrate from the bent portion and capacitively coupled to the ground via the dielectric base material
Data Source
AI summary
A folded antenna includes: a substrate including a dielectric base material and a ground disposed on a first surface of the dielectric base material; and an antenna element including a bent portion bent in a direction perpendicular to the substrate, and a folded portion further bent in a direction parallel to the substrate from the bent portion and capacitively coupled to the ground via the dielectric base material. An impedance of the folded antenna is adjusted by adjusting an area of the folded portion by changing a width dimension of the folded portion without changing a height dimension of the bent portion.