Pneumatic Steerable Antenna Array Without Electronic Phase Shifters
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Solution Overview
Problem
Conventional active electronically steerable antennas (AESAs) require significant power and are cost-prohibitive due to the need for individual amplifiers and phase shifting elements, making them expensive and difficult to manufacture.
Innovation Solution
A steerable antenna array design that uses a substrate-mounted array of antennas fed by a common microstrip feed, with cavities within the substrate to deflect a ground plane and induce phase shifts, allowing beam steering without additional expensive electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active electronically steerable antennas (AESAs) are used to achieve beam steering, then beam steering capability is improved, but cost and device complexity increase significantly due to individual amplifiers and phase shifting elements
Solution Approach 1:
The patent replaces the electronic phase shifting mechanism with a mechanical/physical approach using fluid-filled cavities. By introducing fluid (gas or liquid) into cavities positioned beneath antenna elements, the system mechanically alters the electromagnetic path length and phase through physical displacement of the ground plane, eliminating the need for electronic phase shifters and amplifiers at each antenna element.
Solution Approach 2:
The patent employs pneumatic and hydraulic principles by using fluid-filled cavities to control beam steering. Fluid pressure changes cause the ground plane to deflect, thereby adjusting the phase of electromagnetic waves from individual antenna elements. This pneumatic/hydraulic mechanism replaces complex electronic control systems with a simpler fluid-based actuation system.
2Measurement precision
If AESAs with individual amplifiers and phase shifters are used, then beam steering precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive, complex electronic components (amplifiers and phase shifters) with inexpensive fluid-filled cavities and a common power amplifier. The fluid cavities act as simple, low-cost phase control elements that can be manufactured using standard PCB techniques, dramatically reducing per-unit manufacturing costs while maintaining beam steering functionality.
Solution Approach 2:
The patent merges multiple functions into a single common power amplifier located at the feed point, eliminating the need for individual amplifiers at each antenna element. The fluid-filled cavities under each antenna element provide the necessary phase control that would otherwise require separate electronic phase shifters, consolidating the system architecture and reducing component count.
3Ease of manufacture
If a common feed is used instead of individual feeds for each antenna, then manufacturing ease is improved, but beam steering capability must be maintained
Solution Approach 1:
The patent introduces fluid-filled cavities as intermediary elements between the common feed and the antenna elements. These cavities act as phase control mediators, allowing a single common feed to effectively drive multiple antenna elements with different phases by adjusting fluid pressure in each cavity, thereby enabling beam steering without requiring individual feeds.
Solution Approach 2:
The patent changes the physical parameters of the system by using fluid pressure as a controllable parameter to adjust phase. By varying the pressure of fluid in each cavity, the effective electrical length of the antenna element's transmission path is changed, allowing dynamic phase control and beam steering from a common feed source.
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
Enables cost-effective and efficient beam steering with reduced electrical components, allowing for a wide range of frequencies and flexible array configurations, while maintaining manufacturing ease.
Implementation Method 1
induce phase shifts, allowing beam steering without additional expensive electronics
Implementation Method 2
a microstrip feed within the substrate, where the feed is configured to electromagnetically couple to each antenna element of the array of antenna elements
Implementation Method 3
Antennas may be arranged in a linear array with all the antennas aligned on a line, a two dimensional array with all the antennas aligned on a plane, or other possible antenna array arrangements as well
Implementation Method 4
Some systems may also estimate the relative motion of objects causing radar reflections based on Doppler frequency shifts in the received reflected signals
Data Source
AI summary
Methods and systems for a steerable antenna array are disclosed. The antenna array includes an array of antenna elements aligned in rows and columns on a substrate. Additionally, the antenna array includes a microstrip feed within the substrate, where the feed is configured to electromagnetically couple to each antenna element of the array of antenna elements. The antenna array further includes a ground plane within the substrate. Additionally, for each antenna element, the antenna array includes a first cavity disposed between the ground plane and feed, and a second cavity disposed on the other side of the ground plane from the first cavity. The antenna array further includes a plurality of fluid lines configured to selectively add or remove fluid from the cavities coupled to the fluid line and cause a deflection of the ground plane in a region of the cavities coupled to the fluid line.