Dielectric Antenna LTCC Waveguide Phased Array Gain
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Solution Overview
Problem
Millimeter-wave antennas face challenges in achieving high gain and wide angular coverage due to the high dielectric constant of LTCC substrates and the need for precise fabrication and assembly, which limits their applicability in complex wireless communication environments.
Innovation Solution
A dielectric antenna design featuring multiple dielectric units with conductive and interconnect structures, where each unit is separated into regions with a conductive waveguide structure and a signal feeding terminal, allowing for increased gain and adjustable beam direction through phased array configurations, and fabricated using LTCC technology for a multilayer circuit carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional patch antenna is fabricated on LTCC substrate, then antenna can be integrated with RF front-end chip, but antenna gain is limited to 4-6 dBi due to high dielectric constant
Solution Approach 1:
The antenna is divided into multiple patch elements arranged in an array configuration. Each patch is a separate radiating element that can be individually controlled through phase shifters, allowing the array to achieve higher gain through constructive interference while maintaining integration with the LTCC substrate.
Solution Approach 2:
Phase shifters are incorporated to dynamically control the phase of signals fed to each patch element. This enables electronic beam steering and adjustment of radiation patterns without mechanical movement, allowing the antenna to adaptively optimize gain in different directions while integrated on LTCC.
2Power
If array antenna module is constructed with large number of units to increase gain, then EIRP requirement is met, but fabrication precision and assembly alignment accuracy needed becomes relatively higher
Solution Approach 1:
Multiple antenna patches, feeding networks, phase shifters, and grounding structures are merged into a single multi-layer LTCC module. The through-holes and conductive paths are formed simultaneously during LTCC fabrication, eliminating the need for separate assembly steps and reducing cumulative alignment errors that would occur with discrete component assembly.
Solution Approach 2:
The mechanical assembly process for aligning multiple antenna elements is replaced by integrating all components into a monolithic LTCC structure. The precise positioning is achieved through the LTCC lamination process itself, where conductive layers and dielectric layers are bonded together with controlled thickness and alignment, substituting mechanical assembly with a ceramic processing approach.
3Power
If single antenna module is designed to reach higher gain in array, then EIRP is improved, but angular coverage for main beam becomes not sufficiently wide
Solution Approach 1:
Phase shifters are used to dynamically adjust the phase difference between adjacent patch elements, enabling electronic beam steering. By changing the phase progression across the array, the main beam can be electronically steered to different angles without physical movement, providing wide angular coverage while maintaining high gain through phased array interference.
Solution Approach 2:
The antenna array is designed to perform multiple functions: achieving high gain through array factor, steering beams to different angles through phase control, and potentially forming multiple beams simultaneously. This multi-functionality allows the same physical structure to adapt to different communication scenarios requiring different gain and coverage characteristics.
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 enhances antenna gain, simplifies assembly, and provides flexible beam coverage, enabling efficient operation in various environments while maintaining low manufacturing costs and precision requirements.
Implementation Method 1
The conductive structure covers the surface of the second region of each individual dielectric unit to form a waveguide structure
Implementation Method 2
The interconnect structure has a transverse width, which is smaller than a critical size
Implementation Method 3
The dielectric constant for the LTCC is relatively high, such as approximately 5 to 8
Data Source
AI summary
A dielectric antenna includes at least one dielectric unit. Each dielectric unit is separated into a first region and a second region, and the second region could have a bending portion. A conductor covers a surface of the second region of the dielectric unit to form a waveguide structure. The waveguide structure has a first endpoint connected to the first region and a second endpoint serving as a signal feeding terminal for feeding or receiving signals.