Planar Dipole Antenna Layout for Compact Circular Polarization
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Solution Overview
Problem
Existing circularly polarized radio frequency antennas are bulky due to their size, which hinders their integration and application in compact systems such as satellite communications and GPS systems.
Innovation Solution
A compact radio frequency antenna design featuring an array of interconnected dipoles with specific strand arrangements and loads, optimized for right circular polarization with minimal cross-polarization gain, allowing for reduced bulk and efficient operation across multiple frequency bands without complex excitation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional circularly polarized antennas (microstrip, helical, crossed dipoles) are used, then circular polarization is achieved, but the antenna size becomes large
Solution Approach 1:
The antenna is divided into multiple dipole elements arranged in a polygonal configuration, where each dipole contributes to the overall circular polarization. This segmentation allows the antenna to achieve circular polarization through the collective radiation pattern of multiple smaller elements rather than requiring a single large structure.
Solution Approach 2:
The invention transitions from planar or linear antenna structures to a three-dimensional polygonal arrangement of dipoles. The dipoles are positioned at vertices of a polygon with specific spatial relationships, creating a volumetric radiation pattern that produces circular polarization while maintaining a compact footprint.
2Ease of operation
If multiple radiating elements with complex excitation circuits are used, then circular polarization is achieved, but the device complexity increases
Solution Approach 1:
The antenna structure itself generates the phase differences required for circular polarization through its geometric configuration. The polygonal arrangement and specific positioning of dipoles create inherent phase relationships in the radiated fields, eliminating the need for external phase-shifting circuits or complex excitation networks.
Solution Approach 2:
The invention changes the geometric parameters of the antenna structure (polygon shape, dipole positioning, inter-element spacing) to achieve the desired circular polarization characteristics. By adjusting these physical parameters rather than using complex electrical circuits, the design simplifies the overall system while maintaining polarization performance.
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 antenna achieves uniform right circular polarization with enhanced gain in the desired direction and minimized cross-polarization, suitable for satellite positioning systems and other applications, while reducing bulk and manufacturing costs through a simplified design.
Implementation Method 1
a radio frequency transmitter suitable for generating or receiving a wave at the operating frequency
Implementation Method 2
The antenna achieves uniform right circular polarization with enhanced gain in the desired direction
Implementation Method 3
each coupled dipole being connected at an access point to a respective resistive and/or capacitive and/or inductive load
Implementation Method 4
each coupled dipole being connected at an access point to a respective resistive and/or capacitive and/or inductive load
Implementation Method 5
each coupled dipole being connected at an access point to a respective resistive and/or capacitive and/or inductive load
Data Source
AI summary
The present invention relates to a radio frequency antenna (10) including an antenna array (12) operating at one wavelength and comprising:a powered dipole (14A) connected at an access point (15) to a radio frequency transmitter generating or receiving a wave at the wavelength,at least one coupled dipole (14C1, 14C2, 14C3) connected at an access point to a respective load (Z1, Z2, Z3),the powered dipole (14A) and each coupled dipole (14C1, 14C2, 14C3) including two strands extending from the access point (15), the access points (15) being arranged so as to form a polygon, the first strand of a dipole (14) extending along the second strand of a neighboring dipole (14) at a distance less than one tenth of the wavelength.