Cavity Packages for RF Devices
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Solution Overview
Problem
Manufacturing high-performance radio frequency (RF) devices with precise cavities is challenging due to difficulties in incorporating and dimensioning these cavities, which affects the devices' bandwidth and gain, especially as frequencies increase.
Innovation Solution
Integrated device packages with cavities are developed, featuring a semiconductor element, an antenna structure, and a device die connected via a vertical interconnect, where the cavity is precisely dimensioned to enhance RF performance by reducing horizontal dimensions and using a cavity filler with a low loss tangent to improve bandwidth and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing methods are used for RF devices, then manufacturing process is simpler, but manufacturing precision of cavity dimensions is insufficient
Solution Approach 1:
The cavity is formed as a pre-defined feature in the substrate before the RF device is assembled. This preliminary formation of the cavity with precise dimensions eliminates the need for post-assembly cavity fabrication, thereby achieving high manufacturing precision while managing process complexity through sequential manufacturing steps.
Solution Approach 2:
The RF device is positioned and bonded within the pre-formed cavity, creating a nested structure where the device sits inside the cavity. This nesting approach allows the cavity to serve multiple functions: defining the device position, providing mechanical support, and enabling precise dimensional control, thereby improving manufacturing precision without proportionally increasing overall complexity.
2Adaptability or versatility
If cavity size is increased to improve bandwidth, then bandwidth increases, but device area increases
Solution Approach 1:
The patent modifies the physical parameters of the cavity, specifically its depth and aspect ratio, to optimize bandwidth performance. By increasing the cavity depth rather than its lateral dimensions, the effective electrical length is increased, improving bandwidth and resonant frequency characteristics without proportionally increasing the device footprint, thus achieving parameter optimization with minimal area penalty.
Solution Approach 2:
Instead of increasing cavity bandwidth by expanding lateral dimensions (2D approach), the patent utilizes the vertical dimension (3D approach) by deepening the cavity. This dimensional transition allows bandwidth enhancement through increased electrical length and Q-factor adjustment while maintaining a compact planar footprint, effectively decoupling bandwidth from device area.
3Measurement precision
If direct bonding is used to reduce electrical load, then signal transfer accuracy improves, but manufacturing difficulty increases
Solution Approach 1:
The bonding surfaces are prepared in advance through preliminary processing steps including cleaning, surface activation, and alignment fixture design. This preliminary preparation ensures that when direct bonding occurs, the surfaces are ready for optimal bonding conditions, achieving high signal transfer accuracy through controlled direct bonding while managing manufacturing difficulty through pre-planned surface preparation protocols.
Data Source
AI summary
An integrated device package is disclosed. The integrated device package can include an integrated device die, an element, a cavity, and an electrical interconnect. The element can have an antenna structure. The element can be attached to a surface of the integrated device. The cavity can be disposed between the integrated device die and the antenna structure. The electrical interconnect can connect the integrated device die and the antenna structure.