End-Loaded Antenna Element for D-Plane Polarization Stability
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Solution Overview
Problem
Existing tapered slot antenna designs face challenges in maintaining D-plane polarization stability without compromising gain, bandwidth, scan volume, or manufacturability, as they tend to experience polarization instability with increasing scan angles and frequency ranges.
Innovation Solution
The implementation of an end-loaded antenna element design with contiguous lateral cross-sectional shapes, featuring symmetric fins that widen from the center to the perimeter, which are injection molded to form a dual-polarized, broadband, exponentially tapered phased array, allowing for improved polarization control without sacrificing performance or manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If element length is increased to achieve impedance taper for minimum frequency matching, then bandwidth is improved, but D-plane polarization stability deteriorates
Solution Approach 1:
The patent applies local quality by introducing end-loaded structures specifically at the base portion of the antenna element, rather than uniformly modifying the entire element. The end-loaded structure with outward-extending fins is placed only at the base to provide impedance taper for bandwidth extension, while the upper portion maintains its original tapered slot geometry to preserve polarization stability. This localized modification resolves the contradiction by allowing bandwidth improvement through impedance control at the base without introducing polarization-disturbing vertical currents along the full element length.
2Adaptability or versatility
If cell spacing is increased to achieve desired scan angle coverage, then scan range is improved, but polarization stability in D-plane deteriorates
Solution Approach 1:
The end-loaded structure with asymmetric fin configuration is applied locally at the base portion of each antenna element. The fins extend outward from the center line with widths greater at the outer perimeter than at the center, creating a localized impedance transformation region. This local modification allows the antenna to maintain polarization stability even when cell spacing is increased for broader scan coverage, as the end-loaded base structure compensates for the polarization-disturbing effects of larger element separations.
3Duration of action of stationary object
If separation between minimum and maximum frequency is increased, then bandwidth is improved, but D-plane polarization stability deteriorates
Solution Approach 1:
The patent employs parameter changes by modifying the geometric parameters of the base portion through the end-loaded structure. The fins extend outward from the center line with specific width variations (greater at outer perimeter than at center), creating a controlled impedance transformation. This geometric parameter modification enables the antenna to achieve broader frequency separation while maintaining polarization stability, as the end-loaded base structure provides the necessary impedance taper without requiring increased element length that would otherwise cause polarization distortion.
Data Source
AI summary
The embodiments described herein are directed to providing a notched antenna element for improving polarization control without sacrificing gain, bandwidth, scan volume, recurring cost, or manufacturability. The notched antenna element includes a base portion comprising a plurality of contiguous first cross-sectional notched antenna elements, each of the plurality of first cross-sectional notched antenna elements configured in an end-loaded structure for increasing polarization stability; and an upper portion coupled to the base portion, the upper portion comprising a plurality of contiguous second cross-sectional notch antenna elements.