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Dual frequency band quadrifilar helix antenna systems and methods

A technology of helical antenna and antenna system, applied in the directions of helical antenna, antenna, antenna coupling, etc., can solve the problem of increasing the physical space of the antenna system

Inactive Publication Date: 2003-08-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed system actually doubles the physical space required by the antenna system by using two insulated patch antennas

Method used

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  • Dual frequency band quadrifilar helix antenna systems and methods
  • Dual frequency band quadrifilar helix antenna systems and methods
  • Dual frequency band quadrifilar helix antenna systems and methods

Examples

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Embodiment Construction

[0025] The present invention will now be described more fully with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. Although this invention may be embodied in many different forms, it should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the invention to those skilled in the art. scope. Additionally, while the antenna systems of the present invention are particularly advantageous for use in certain satellite communications applications, those skilled in the art will appreciate that these antenna systems may be advantageous for use in a variety of applications, including cellular, land-based communications systems, and by This should not in any way be construed as limiting the invention to antenna systems for satellite communication terminal handsets. Like numbers refer to like elements throughou...

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Abstract

A quadrifilar helix antenna system capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separate transmit and receive frequency bands. This new antenna system comprises concentrically arranged, but electrically isolated, transmit and receive quadrifilar helix antennas, each of which comprises two bifilar helices arranged orthogonally and excited in phase quadrature. In the preferred embodiment, the antenna elements forming each bifilar helix are short-circuited at their distal ends, and energy is induced from the receive antenna and coupled to the transmit antenna via receive and transmit 90 DEG hybrid couplers which are electrically connected to the bifilar loops of the respective receive and transmit antennas. Also provided are switches or other disconnection means which are used to electrically isolate the transmit antenna during periods when the antenna is receiving a signal and to electrically isolate the receive antenna during periods of transmission. In the preferred embodiments, these disconnecting means are implemented as PIN diodes or radio frequency Gallium arsenide field effect transistor switches.

Description

technical field [0001] The present invention generally relates to antenna systems for user terminal handsets. More specifically, the present invention relates to quadrifilar helical antenna systems for mobile telephone subscriber handsets. Background technique [0002] Cellular or satellite communication systems are well known in the art for providing communication links between mobile telephone users and fixed or other mobile users. These communication links can carry many different forms of information, including voice, data, video, and facsimile transmissions. In a typical cellular system, wireless transmissions from mobile users are received by local, land-based, transmitter / receiver stations. These local base stations or "cells" then retransmit the mobile subscriber's signal through the local telephone system or cellular system for reception by the desired receiving terminal. [0003] Many cellular systems rely primarily or exclusively on line-of-sight communications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/24H01Q1/52H01Q5/00H01Q5/40H01Q11/08
CPCH01Q1/242H01Q5/0072H01Q1/525H01Q11/08H01Q5/40
Inventor 小G·A·奥内尔
Owner TELEFON AB LM ERICSSON (PUBL)