Low-frequency ultra-wideband planar omnidirectional antenna

An omnidirectional antenna and ultra-wideband technology, applied to antennas, devices that enable antennas to work in different bands at the same time, electrical components, etc., can solve problems such as narrow antenna bandwidths

CN104882676AActive Publication Date: 2015-09-02NANJING UNIV OF INFORMATION SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-09-02

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Abstract

The invention discloses a low-frequency ultra-wideband planar omnidirectional antenna. The antenna includes a dielectric substrate, a metal radiation patch, a metal ground plate and a loading resistor. The dielectric substrate is made from FR-4, and has a first surface and a second surface opposite to the first surface. The metal radiation patch is arranged on the first surface of the dielectric substrate. The metal ground plate and the loading resistor are arranged on the second surface of the dielectric substrate. The metal radiation patch is formed by a U-shaped patch and a disc. The tail end of the U-shaped patch and the top end of a gradual changing microstrip feed line are connected via an inverted triangular metal patch. The metal ground plate is a rectangular frame metal patch, a trapezoid patch and two long strip patches are arranged inside the metal rectangular frame, and the same load resistance is applied to the two ends of the metal rectangular frame. Feeding of the whole antenna is carried out through a 50[omega] coaxial line. The low-frequency ultra-wideband planar omnidirectional antenna provided by the invention is compact in structure and wide in bandwidth scope, and exhibits good low frequency omnidirectional performance.
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Description

technical field

[0001] The invention belongs to the field of microstrip antennas and relates to a novel planar ultra-wideband antenna design. The frequency of the antenna covers VHF and UHF frequency bands and has good omnidirectional characteristics. Background technique

[0002] In modern communication systems, antennas are an important part of the system, and people have put forward higher and higher requirements for broadband and miniaturization. The design of the antenna must comprehensively consider the working bandwidth, the system gain and other electrical performance parameters, as well as various factors such as compact structure and miniaturization. Broadband omnidirectional antennas currently working in the VHF and UHF frequency bands are mainly inverted cone antennas, disc cone antennas, and sleeve antennas. If these types of antennas work in the VHF frequency band, the space size will be relatively large. Among many antennas, the planar monopole antenna has t...

Examples

Embodiment Construction

[0023] Such as figure 1 and figure 2 As shown, a low-frequency ultra-wideband planar omnidirectional antenna provided by the present invention includes: a dielectric substrate, a metal radiation patch, a metal ground plate and a loading resistor. The material of the dielectric substrate is FR-4, including a first surface and a second surface opposite to the first surface; the metal radiation patch is arranged on the first surface of the dielectric substrate, and the metal ground plate and the loading resistor are arranged on the second surface of the dielectric substrate Above; the antenna is fed through a 50Ω coaxial line, and the feed point is located at 0.5cm from the bottom of the antenna, such as figure 2 (b).

[0024] The metal radiation patch is composed of a U-shaped patch and a disc; between the end of the U-shaped patch and the top of the tapered microstrip feeder, it is connected by an inverted triangle metal patch 1;

[0025] The metal grounding plate is a met...