SPNT Switch Arrangement with DC Bias Control for RF Feed Selection
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Solution Overview
Problem
Existing RF switch technologies do not provide optimal performance for selecting and connecting multiple radio frequency feeds to an antenna, lacking efficient control mechanisms for radio frequency signals.
Innovation Solution
A single pole N throw (SPNT) switch arrangement using a transistor switch mechanism with a dc bias source to control the connection and disconnection of throw nodes, employing a combination of RF and dc signals to actuate the switch, and filtering to isolate RF signals from dc bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is used to select multiple RF feeds to an antenna, then feed selection capability is improved, but switching control mechanism is insufficient
Solution Approach 1:
The patent applies parameter changes by utilizing DC bias voltage levels to control the switching state of transistor elements. By varying the DC bias parameter, the switch mechanism transitions between different states (on/off, connected/disconnected), enabling reliable feed selection. This resolves the contradiction by providing a robust control mechanism that directly manipulates electrical parameters to achieve dependable switching operation.
2Ease of operation
If DC bias is applied to control switch actuation, then switching control is improved, but DC signal may interfere with RF signal
Solution Approach 1:
The patent segments the signal paths by providing separate interconnected paths for DC bias signals and RF signals. The DC bias is applied through one path to control switch actuation, while the RF signal travels through another path. This segmentation prevents the DC signal from interfering with the RF signal, as they are electrically isolated in different circuit paths. The switch mechanism responds to the DC control signal without the DC component contaminating the RF signal path.
3Speed
If transistor switch mechanism is used, then switching speed is improved, but DC bias control complexity increases
Solution Approach 1:
The patent applies universality by using a single DC bias source that can control multiple transistor switch elements through interconnected paths. The same DC bias mechanism serves multiple switching functions simultaneously, reducing overall control complexity. Each transistor element responds to the DC bias level according to its specific interconnect configuration, allowing one control system to manage multiple switches without proportionally increasing complexity.
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 efficient selection and connection of radio frequency feeds to an antenna, allowing for toggling between different resonant frequencies by controlling the dc bias, thereby improving RF switch performance.
Implementation Method 1
a transistor arranged to have a channel connecting the pole and the first throw node and a gate connected to receive the dc bias signal, wherein the transistor channel is arranged to provide the RF signal to the antenna arrangement when a dc bias signal is provided by the dc bias source
Data Source
AI summary
A single pole N throw (SPNT) switch arrangement including: a pole, one or more throw nodes and a switch mechanism arranged to connect the pole and a first throw node in response to a first signal and to disconnect the pole and the first throw node in response to a second signal; an interconnect, for providing the first signal, arranged for connection to the pole when providing the first signal; and a dc power source arranged to control a dc bias applied to the interconnect to provide the first signal