Single-Layer ME-Dipole Loop Antenna for Broadband Endfire Radiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vertically polarized endfire antennas for millimeter-wave applications face challenges in achieving a low-profile structure, broad bandwidth, and stable radiation performance due to the need for multiple layers of substrates and tilted radiation patterns.
Innovation Solution
A single-layer broadband vertically polarized endfire magnetoelectric dipole antenna is designed using a substrate-integrated closed loop as the main radiator, connected via a substrate integrated waveguide and parallel-strip lines, with vertical metallic vias functioning as electric dipoles and the radiation aperture acting as a magnetic dipole, enhancing front-to-back ratio through a backed cavity and rectangular slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multi-layer substrate structures are used to increase bandwidth, then bandwidth is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple functional elements (radiator, feed network, and bandwidth extension structures) into a single-layer substrate configuration. The magnetoelectric dipole loop antenna integrates electric and magnetic resonance modes within one layer, eliminating the need for separate layers that would otherwise be required to achieve similar bandwidth performance.
Solution Approach 2:
The single-layer structure performs multiple functions simultaneously: it provides radiation through the magnetoelectric dipole loop, achieves bandwidth extension through coupled resonant modes, and maintains endfire radiation capability. This multi-functionality within a single layer reduces overall device complexity while maintaining broad bandwidth.
2Duration of action of moving object
If multi-layer substrate structures are used to increase bandwidth, then bandwidth is improved, but manufacturing cost increases
Solution Approach 1:
By merging all necessary antenna functions into a single-layer structure, the patent eliminates the need for complex multi-layer stacking, alignment, and inter-layer connectivity that would increase manufacturing cost. The single-layer magnetoelectric dipole loop can be fabricated using standard planar processing techniques.
3Length of stationary object
If low-profile structure is achieved through single-layer design, then profile height is reduced, but bandwidth is limited
Solution Approach 1:
The patent employs dynamic resonance coupling between electric and magnetic modes within the single-layer magnetoelectric dipole structure. This dynamic interaction between resonant modes enables bandwidth extension without increasing the physical profile height, as the bandwidth is achieved through electromagnetic field coupling rather than physical layer stacking.
Solution Approach 2:
The patent adjusts geometric parameters of the magnetoelectric dipole loop (such as loop dimensions, feed position, and substrate properties) to optimize the coupling between resonant modes. By carefully controlling these parameters, the antenna achieves both low profile height and broad bandwidth through resonant mode interaction.
4Stability of the object's composition
If existing VP endfire antenna structures are used, then vertical polarization is achieved, but radiation pattern becomes tilted away from endfire
Solution Approach 1:
The patent introduces asymmetry in the feed structure and loop configuration to control the phase and amplitude distribution of currents in the magnetoelectric dipole. This asymmetric feeding arrangement ensures that the radiation pattern maintains true endfire orientation while preserving vertical polarization, overcoming the limitation of conventional symmetric VP endfire antennas.
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 achieves a wideband magnetic dipole complementary structure with endfire radiation, low-profile structure, broad bandwidth, and stable radiation performance, with a bandwidth of 59.2% and a front-to-back ratio exceeding 25 dB, while maintaining a low cross-polarization level.
Implementation Method 1
the first vertical metallic vias function as electric dipoles while the radiation aperture of the entire substrate-integrated closed loop is equivalent to a magnetic dipole, generating endfire radiation
Implementation Method 2
the first vertical metallic vias function as electric dipoles while the radiation aperture of the entire substrate-integrated closed loop is equivalent to a magnetic dipole, generating endfire radiation
Implementation Method 3
a substrate integrated waveguide for feeding
Data Source
AI summary
A single-layer broadband vertically polarized endfire magnetoelectric dipole (ME-dipole) antenna and an antenna array. The main radiator of this antenna is a substrate-integrated closed loop, which consists of two horizontal metallic strips printed on the upper and lower surfaces of substrate and a pair of vertical metallic vias. Excited by a double-sided parallel-strip line at the center of the loop, the metallic vias function as electric dipoles while the entire loop aperture works as magnetic dipole. To facilitate integration, this magnetoelectric dipole loop antenna is fed by an open-ended substrate integrated waveguide (SIW), which also works as a backed cavity to enhance the front-to-back ratio. Moreover, rectangular slots are etched at the edges of the SIW aperture to further improve the front-to-back ratio and also the cross-polarization performance. Thus, a vertically polarized endfire ME-dipole loop antenna with a low-profile structure, broad bandwidth, and stable radiation performance is achieved.