Differential Feed Loop for Balun-Free Monopole Wire-Plate Antennas
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Solution Overview
Problem
Monopolar wire-plate antennas require the use of a balun to connect to differential connection radio frequency transmitters, increasing the bulk and causing radio frequency losses due to the addition of non-integrable components.
Innovation Solution
A monopolar wire-plate antenna design featuring a feed loop orthogonal to the ground plane with opposite longitudinal ends connected to a differential connection, allowing direct connection to a transmitter without the need for a balun, which reduces the influence of the antenna's context and enhances impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a balun is added to enable differential connection, then the antenna can be connected to a differential transmitter, but the device size increases and radio frequency losses occur
Solution Approach 1:
The invention extracts and eliminates the balun component from the antenna system by reconfiguring the feed loop to accept differential connection directly. The feed loop is designed with two opposite longitudinal ends that can be connected to differential terminals, removing the need for the balun and its associated volume and losses.
Solution Approach 2:
The feed loop is designed to serve multiple functions: it acts as both the radiating element and the connection interface for differential transmitters. By making the feed loop itself differential-compatible, the invention eliminates the need for separate balun components, achieving multi-functionality with a single integrated structure.
2Adaptability or versatility
If a balun is added to enable differential connection, then the antenna can be connected to a differential transmitter, but radio frequency losses increase due to additional non-integrable components
Solution Approach 1:
The invention extracts and eliminates the balun component from the antenna system. By removing this non-integrable component, the invention eliminates the radio frequency losses that occur at the balun interface, while still maintaining differential connection compatibility through the reconfigured feed loop.
3Adaptability or versatility
If a balun is added to enable differential connection, then the antenna can be connected to a differential transmitter, but the device complexity increases due to additional components
Solution Approach 1:
The invention extracts and removes the balun component from the antenna system. This elimination reduces the number of components and simplifies the overall device complexity, while the feed loop is simultaneously configured to maintain differential connection compatibility.
Solution Approach 2:
The invention merges the feed loop functionality with the differential connection interface. Instead of having separate feed loop and balun components, the feed loop itself is designed to accept differential connections, combining multiple functions into a single integrated element and reducing overall 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
This design enables efficient power supply and signal transmission/reception without a balun, reducing the antenna's size and minimizing radio frequency losses, while maintaining satisfactory impedance matching and radiation efficiency.
Implementation Method 1
impose a distribution of the electromagnetic field in a suitable manner between the ground plane and the roof to allow the monopole wire-plate antenna to present a desired impedance and, if necessary, to emit a satisfactory electromagnetic wave
Implementation Method 2
The core 106a is furthermore successively surrounded by a sheath 106b made of dielectric material 106b, then a metal tube 106c electrically connected to the ground plane, the sheath 106b made of dielectric material ensuring electrical insulation between the core 106a and the metal tube 106c. Such a coaxial feed probe 105 forms a coaxial waveguide in which a quasi-transverse electric magnetic (TEM) mode is established to guide and propagate the wave in the waveguide.
Data Source
Figure 1~2
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Figure 6~7
AI summary
The monopolar wire-plate antenna (100) comprises a ground plane (101), a roof (102) arranged at a distance from the ground plane (101), and at least one electrically conductive element (103a) electrically connecting the ground plane (101) to the roof (102). This antenna (100) comprises a feed loop (107) arranged substantially orthogonally with respect to the ground plane (101), said feed loop (107) being open such that it comprises two opposing longitudinal ends (108, 109) arranged to be connected to a differential connection.