Bias Tee Ground Capacitance Layout for Wider RF Bandwidth
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Solution Overview
Problem
Conventional bias tees have a relatively narrow RF bandwidth and require expensive manufacturing tools for customization, limiting their use in wider frequency ranges and flexibility.
Innovation Solution
A bias tee design with an RF transmission line capacitively coupled to ground, featuring adjustable dimensions and dielectric materials, allowing for customizable transmission zeros and a wider operating bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional bias tee designs are used, then the structure is simple and manufacturing is straightforward, but the RF bandwidth is narrow and customization requires expensive manufacturing tools
Solution Approach 1:
The patent applies parameter changes by modifying the physical dimensions of the RF transmission line (length, width, thickness) and the dielectric material properties (permittivity, thickness) to achieve different transmission zero frequencies and bandwidths. This allows the same basic structure to be customized for different frequency ranges without requiring expensive new manufacturing tools, simply by adjusting dimensional parameters.
Solution Approach 2:
The patent introduces adjustability and configurability into the bias tee design through the RF transmission line structure with capacitance to ground. The design allows for dynamic adjustment of operational parameters such as transmission zero frequency and bandwidth by modifying the transmission line dimensions and dielectric configuration, enabling the system to adapt to different frequency requirements.
2Power
If the RF transmission line is made thicker (at least 1 millimeter), then power handling capability is improved, but the device complexity increases
Solution Approach 1:
The patent uses a composite structure combining a thick metallic RF transmission line (at least 1 millimeter thick) with a dielectric material to achieve both high power handling capability and controlled electrical characteristics. The combination of the thick metal conductor and dielectric layer with specific permittivity creates a composite transmission line that can handle high power while maintaining precise control over transmission zero frequency and bandwidth.
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
The design provides a wider operating bandwidth of about 2,690 MHz with isolation of 30 dB or greater in the 800-3,500 MHz frequency range, and is more easily customizable than conventional tees.
Implementation Method 1
a dielectric material that is configured to provide a capacitance between the RF transmission line and electrical ground
Implementation Method 2
an RF transmission line that is coupled between the common port and the low-frequency port
Data Source
AI summary
Bias tees are provided that include a radio frequency (RF) transmission line. The bias tees include a dielectric material that is configured to provide a capacitance between the RF transmission line and ground. The bias tees include a high-frequency port, a common port, and a low-frequency port, and the RF transmission line is coupled between the common port and the low-frequency port.