Leaky Cavity Resonator for Phased Array Antenna Weight Reduction
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Solution Overview
Problem
Current band-pass filter solutions for phased array antennas, using cascaded linear ceramic resonators, result in increased system thickness and weight due to the need for higher dielectric materials and substantial resonator thickness, leading to co-site interference issues from unwanted energy coupling.
Innovation Solution
Incorporating complementary split ring resonators (CSRRs) within a waveguide filled with dielectric material, forming leaky resonant cavities that allow for adjustable frequency band-pass characteristics without increasing the waveguide's size or weight, by optimizing the dimensions of the CSRRs and their stubs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cascaded linear ceramic resonators are used for band-pass filtering, then frequency selectivity is improved, but waveguide height and weight substantially increase
Solution Approach 1:
The patent changes the physical parameters of the resonator structure by using complementary split ring resonators with specific geometric configurations (outer radius, inner radius, gap dimensions) and optimizing the dielectric material properties to achieve the desired frequency selectivity without increasing waveguide dimensions. The resonant frequency is controlled by adjusting the CSRR geometric parameters rather than increasing resonator thickness
Solution Approach 2:
The patent transitions from using multiple cascaded resonators stacked in one dimension (increasing height) to using a single planar CSRR structure with optimized two-dimensional geometry. The frequency selectivity is achieved through in-plane dimensional optimization rather than vertical stacking, thereby reducing waveguide height and weight
2Measurement precision
If cascaded linear ceramic resonators are used for band-pass filtering, then frequency selectivity is improved, but system thickness increases
Solution Approach 1:
The patent optimizes the geometric parameters of the CSRR (outer radius R1, inner radius R2, gap width w, stub length L) to control the resonant frequency and bandwidth characteristics. This parameter optimization allows achieving the desired frequency selectivity within a compact planar structure that does not increase waveguide height
Solution Approach 2:
The patent uses a planar two-dimensional CSRR structure instead of three-dimensional cascaded resonators. The frequency filtering function is achieved through in-plane geometric configuration rather than vertical stacking, thereby reducing the waveguide height while maintaining frequency selectivity
3Reliability
If higher dielectric materials with substantial thickness are used in resonators, then Q factor is improved, but device complexity and size increase
Solution Approach 1:
The patent optimizes the dielectric material parameters (permittivity εr, thickness h) in combination with CSRR geometric parameters to achieve the desired Q factor. The solution finds an optimal balance where moderate dielectric thickness combined with optimized CSRR geometry provides sufficient Q factor without requiring substantial material thickness or complex structures
Solution Approach 2:
The patent compensates for reduced dielectric thickness by optimizing the two-dimensional CSRR geometry (ring dimensions, gap sizes, stub configurations). The high Q factor is achieved through enhanced in-plane resonance characteristics of the CSRR structure rather than relying solely on thick dielectric materials
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 effectively reduces the size and weight of phased array antennas while improving frequency selectivity and reducing co-site interference by allowing a wider pass-band and steeper band drop-off, maintaining symmetry and polarization preservation.
Implementation Method 1
at least two complementary split ring resonators (CSRRs), the CSRRs residing inside the waveguide parallel to each other placed symmetrically both radially and in height, a leaky resonant cavity being formed between the at least two CSRRs and a wall of the waveguide
Implementation Method 2
a waveguide, the waveguide being filled with a dielectric material
Data Source
AI summary
A leaky cavity resonator that includes a waveguide, the waveguide being filled with a dielectric material, and at least two complementary split ring resonators (CSRRs), the CSRRs residing inside the waveguide parallel to each other placed symmetrically both radially and in height, a leaky resonant cavity being formed between the at least two CSRRs and a wall of the waveguide. A frequency band of the leaky cavity resonator is adjustable by varying a distance w between at least one outside perimeter of at least one CSRR and an interior wall of the waveguide. A frequency band of the leaky cavity resonator is also adjustable by varying a size of the leaky resonant cavity. The at least two CSRRs each have at least one stub connecting to a wall of the waveguide. A frequency band of the leaky cavity resonator is also adjustable by varying a size of the stubs.