Edge-Contact Antenna Substrates for Low-Loss IC Integration
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Solution Overview
Problem
Current connection techniques between IC chips and antenna elements on substrates are inefficient, particularly in wireless communications, where small-sized antenna equipment with integrated beamforming components are required, and existing methods fail to provide low-loss connections at high frequencies.
Innovation Solution
The solution involves forming cavities in substrates with edge contacts on the sidewalls and IC chips, where the IC chips have complementary edge contacts that snap into place, enabling electrical connections through conductive vias or bottom surface contacts, allowing for efficient electrical and mechanical integration of antenna elements with RF circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If bondwires are used to connect IC chips to antenna elements, then electrical connections can be established, but inductance is introduced causing signal loss at high frequencies
Solution Approach 1:
The patent extracts and eliminates the bondwire from the connection path between IC chip and antenna element. Instead of using bondwires, the invention creates direct edge-to-edge contact between complementary contacts on the IC chip and the substrate, removing the inductive element entirely while maintaining electrical connectivity.
Solution Approach 2:
The patent transitions from vertical/bondwire-based connections to horizontal/edge-based connections. By utilizing edge contacts on the IC chip that mate with edge contacts on the substrate, the connection occurs in a different spatial dimension, eliminating the need for overhead bondwires and reducing inductance.
2Loss of energy
If integrated structures with edge contacts are used, then low-loss connections at high frequencies are achieved, but fabrication complexity increases
Solution Approach 1:
The patent incorporates edge contacts directly into the IC chip manufacturing process before the chip is completed. The complementary contacts are formed as part of the chip structure, so that when the chip is placed in the substrate cavity, the electrical connections are already prepared and aligned, simplifying the overall assembly process despite the increased chip fabrication steps.
Solution Approach 2:
The IC chip with edge contacts is nested within a cavity in the substrate, and the edge contacts are positioned to mate with corresponding edge contacts on the substrate wall. This nested arrangement allows for precise alignment and integration while maintaining a compact structure that facilitates manufacturing.
3Volume of moving object
If small-sized antenna equipment is required, then integration of IC chips with antenna elements is necessary, but connection losses increase with conventional methods
Solution Approach 1:
The patent merges the IC chip and antenna element into a single integrated structure where the chip is housed within a substrate cavity and electrically connected through edge contacts. This integration eliminates separate connection components like bondwires and reduces overall size while minimizing connection losses through direct contact.
Data Source
AI summary
Disclosed is an antenna apparatus including a substrate having a cavity in a first outer surface thereof. The substrate has a sidewall defining a portion of the cavity, and a first edge contact is formed at the sidewall. An IC chip is disposed within the cavity and has a side surface facing the sidewall and a second edge contact formed on the side surface electrically connected to the first edge contact. An antenna element, disposed at a second outer surface of the substrate opposite the first outer surface, is electrically connected to RF circuitry within the IC chip through a conductive via extending within the substrate.