Multiband whip antenna

• US 9,281,551 B2
• Filed: 07/16/2014
• Issued: 03/08/2016
• Est. Priority Date: 05/06/2009
• Status: Active Grant

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: Apostolos, John T., Mouyos, William, Feng, Judy
• Primary Examiner(s): Jones, Stephen E
• Application Number:
  US14/333,019
• Publication Number:
  US 20140327488A1
• Time in Patent Office: 601 Days
• Field of Search: 333/12, 333/204, 333/205, 340/572.7
• US Class Current: 1/1
• CPC Class Codes: H01P 1/20 Frequency-selective devices, e.g. filters
• CPC Class Codes: H01P 3/08 Microstrips; Strip lines
• CPC Class Codes: H01Q 1/10 Telescopic elements
• CPC Class Codes: H01Q 1/32 Adaptation for use in or on road or rail vehicles
• CPC Class Codes: H01Q 5/314 using frequency dependent circuits or components, e.g. trap circuits or capacitors

Abstract

A multi-band whip antenna having a 30 MHz to 2 GHz bandwidth and an L-band dipole has its coverage extended up to 6 GHz by eliminating nulls and reducing VSWR problems that are cured through the utilization of a sleeve over the feedpoint of the L-band antenna. Chokes in the form of sleeves are provided at either end of the L-band dipole to shorten the L-band antenna for preventing reverse polarity currents at the L-band antenna feedpoint, with the antenna further including the use of double shielded meanderline to provide improved performance between 410-512 MHz and in which a capacitance sleeve is added at the bottom of the L-band antenna to effectively elongate the antenna below the L-band to permit operation below 700 MHz.

Claims

1. A multiband whip antenna comprising

a coaxial line feed running through a plurality of tubular sections to an L-band dipole having a feedpoint, wherein the L-band dipole is configured to increase the bandwidth of the multiband whip antenna 6 GHz;

a double shielded meanderline structure comprising a right hand side and a left hand side, said left hand side being a mirror image of said right hand side, said right hand side having a meanderline structure folded back on itself a number of times, with the top portion of the folded structure extending over the top to the mirror image of the folded shielded meanderline, such that there is a continuous meanderline folded structure from the right hand side to the left hand side; and

a sleeve surrounding the L-band feedpoint configured to minimize reverse polarity currents at the L-band feedpoint.