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High efficiency slot fed microstrip antenna having an improved stub

一种微带天线、隙缝的技术，应用在电气短天线、天线、谐振天线等方向，能够解决限制天线电路性能等问题，达到优化性能的效果

Inactive Publication Date: 2010-09-29
HARRIS CORP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the impedance bandwidth of the stub is usually smaller than that of the radiator and the impedance bandwidth of the slot
Therefore, although conventional stubs can often be used to demodulate the over-reactance of an antenna circuit, the low impedance bandwidth of the stub usually limits the performance of the overall antenna circuit

Method used

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  • High efficiency slot fed microstrip antenna having an improved stub
  • High efficiency slot fed microstrip antenna having an improved stub
  • High efficiency slot fed microstrip antenna having an improved stub

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Embodiment Construction

[0032] Low dielectric constant plate materials are generally chosen for RF designs. For example, commercially available products such as 6002 (dielectric constant 2.94; loss tangent 0012) and 5880 (dielectric constant 2.2; loss tangent .0007) polytetrafluoroethylene (PTFE) based composite. Both materials are common board material choices. These above materials have uniform thickness and physical properties over the plate area and provide a dielectric layer with a relatively low dielectric constant accompanied by a low loss tangent. The relative permeability of these two materials is close to 1.

[0033] Prior art antenna designs use nearly uniform dielectric materials. Uniform dielectric properties require a compromise in antenna performance. For loss considerations and antenna radiation efficiency, low-permittivity substrates are preferred for transmission lines, while high-permittivity substrates are preferred for minimizing antenna size and optimizing energy coupling...

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Abstract

A slot fed microstrip antenna (100) having an improved stub (118) provides enhanced efficiency through more efficient coupling of electromagnetic energy between the feed line (117) and the slot (106). A dielectric layer (105) disposed between the feed line (117) and the ground plane (108) provides a first region (112) having a first relative permittivity and at least a second region (113) having a second relative permittivity. The second relative permittivity is higher as compared to the first relative permittivity. The stub (118) is disposed on the high permittivity region (113). The dielectric layer can include magnetic particles, which are preferably disposed underlying the stub.

Description

Background technique [0001] RF circuits, transmission lines, and antenna elements are usually fabricated on specially designed substrates. Conventional circuit board substrates are typically formed by processes such as casting or spray coating, which generally result in uniform substrate physical properties, including uniform dielectric constants. [0002] For RF circuit applications, it is often important to maintain careful control of the impedance characteristics. If the impedances of different parts of the circuit do not match, signal reflections and inefficient power transfer can result. The electrical length of transmission lines and radiators in these circuits can be a critical design factor. [0003] Two key factors affecting circuit performance involve the dielectric constant of the dielectric substrate material (sometimes called the relative permittivity or ε r ) and the loss tangent (sometimes called the loss factor or δ). The dielectric constant determines the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/38H01Q1/00H01Q1/48H01QH01Q9/04
CPCH01Q9/0407H01Q1/38H01Q1/48H01Q9/0485H01Q13/085H01Q13/106
Inventor 威廉姆·D·基伦兰迪·T·皮克赫里伯托·J·戴尔噶多
Owner HARRIS CORP
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