Coaxial Signal Launch Structure for Compact Package Integration
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Solution Overview
Problem
Conventional integrated devices, particularly those with antennas, face challenges in miniaturization due to large footprints and high manufacturing costs, with conventional launch-on-package devices using rectangular waveguides limiting signal transmission and reception capabilities and increasing complexity.
Innovation Solution
Implementing a coaxial structure with an inner and outer conductor arrangement to reduce the footprint and complexity of integrated devices, allowing for efficient signal propagation and integration of additional components like antennas, while avoiding low frequency limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional rectangular waveguide structures are used for signal transmission, then signal transmission capability is maintained, but device footprint and complexity increase
Solution Approach 1:
The patent transitions from rectangular waveguide geometry to coaxial structure geometry, fundamentally changing the structural parameters of the signal transmission path. This parameter change enables compact integration while maintaining signal transmission capabilities, directly resolving the contradiction between footprint reduction and structural complexity
Solution Approach 2:
The coaxial structure inherently nests the inner conductor within the outer conductor, creating a compact, space-efficient configuration. This nested arrangement allows signal transmission pathways to be integrated within minimal footprint, eliminating the need for separate, bulky waveguide structures
2Area of stationary object
If antennas are integrated on separate PCB substrates, then signal transmission is achieved, but manufacturing cost and device area increase
Solution Approach 1:
The patent merges the antenna integration with the package substrate itself, creating a unified structure where the coaxial signal launches are directly formed on the package substrate. This consolidation eliminates separate PCB antenna substrates and reduces assembly steps, directly addressing both device area reduction and manufacturing cost reduction
Solution Approach 2:
The package substrate serves multiple functions simultaneously: it provides mechanical support for the integrated device, acts as the mounting platform for coaxial signal launches, and integrates antenna structures. This multi-functionality eliminates the need for separate dedicated antenna substrates, reducing both area and manufacturing complexity
3Reliability
If conventional launch-on-package structures are used, then signal connection is established, but low frequency transmission is limited
Solution Approach 1:
The transition from rectangular waveguide to coaxial structure changes the electromagnetic field distribution and transmission characteristics. The coaxial geometry supports a broader spectrum of modes and frequencies, including lower frequencies that are difficult to transmit through conventional waveguide structures, thereby expanding frequency range adaptability while maintaining reliable signal transmission
Data Source
AI summary
Integrated devices having a coaxial structure are described. In one example, an integrated device includes a package substrate and a first coaxial structure. The package substrate includes an integrated die and a signal launch configured to emit or receive a signal. The first coaxial structure is arranged partially on a surface of the package substrate. The first coaxial structure includes an inner coaxial conductor electrically coupled to the signal launch and an outer coaxial conductor comprising an array of grounded conductors arranged to at least partially surround the inner coaxial conductor. The first coaxial structure is adapted to be coupled to a second coaxial structure of a PCB via the surface of the package substrate.