Miniature balanced antenna with differential feed

Abstract

An example antenna system includes a parasitic element and a symmetrical element fed by a balanced RF signal source. The fed element is operable to couple with the parasitic element, thereby causing the parasitic element to resonate at a first frequency band. Thus, the fed element is operable to act as a balanced capacitive feed for the parasitic element. Also, the parasitic element is symmetrical with respect to a polarity of the fed element.

Description

technical field [0001] The present invention relates generally to antenna systems, and more particularly to balanced antenna systems with differential feeding. The invention also relates to a satellite antenna system operating over a wide bandwidth. Background of the invention [0002] Prior art systems, both consumer and commercial, typically employ unbalanced antennas to transmit and receive radio frequency (RF) signals. Most unbalanced antennas have an asymmetric radiating section and are fed by an unbalanced transmission line (such as a coaxial cable or microstrip line) or source. An example of an unbalanced antenna is the common monopole antenna system, which has a single antenna element (a vertical straight metal rod with a length of 1 / 4 free-space wavelength, ), mirrored by a flat horizontal ground plane. There are several reasons why prior art systems employ unbalanced antennas. For example, most commercially available measurement equipment is designed to measur...

AI Technical Summary

Problems solved by technology

[0004] In comparison, state-of-the-art balanced antenna systems tend to be bulky, and so are usually limited to applications where low loss is more important than space

Also, balanced antenna systems often employ complex impedance matching circuits that are expensive and / or difficult to design

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