HFSS宽频带圆极化微带天线设计仿真
关键词：宽频带，圆极化，轴比，增益，微带天线 Abstract
Microstrip antennas are finding increasing popularity owing to their advantages
in size, cost, conformity to the supporting structure and ease of fabrication. So they are
widely employed in radar, navigation, satellite and mobile communication systems.
One of the most interesting applications is their use for transmitting or receiving
systems required for circular polarization. High performance circular polarization
microstrip antennas are being used widely nowadays. Thus， the research on wide-band
and dual-band circular polarization antenna techniques has become the hot research
point of the academic area, and this is the main content of this thesis.
In this paper, technologies of circular polarization and broadband have been
studied. Firstly，This paper introduces the working principle and application of
microstrip antennas. The various types of circularly polarized antennas are briefly
introduced. In this paper, two design methods have been proposed. The broadband
circularly-polarized performance from a spiral slot geometry is realized using a single
microstrip feed. The other is an asymmetrical U-slots on the patches to improve the
bandwidth. Use Ansoft HFSS-electromagnetic simulation software to design the
spiral-slot microstrip antenna and the U-slot microstrip antenna and give the details of
experimental results, simultaneously prove the feasibility of the design.
The U-slot antenna is working at 4.7GHz, impedance bandwidth is 13%, axial
ratio bandwidth is 3.4%, and the highest gain is about 8.18dBi. The spiral-slot antenna
is working at 1.268GHz，the simulations reveal that the impedance bandwidth is
greater than 50%，and the axial ratio bandwidth is 9.5%，which is in agreement with
measured result.
Key words: broadband, circular polarization, axial ratio, gain, microstrip antenna
目 录
摘 要 I
Abstract II
1 绪论 . 1
1.1 研究背景 . 1
1.2 圆极化微带天线的发展现状 2
1.3 本文的主要工作安排 . 3
2 微带天线的基本理论 . 4
2.1 微带天线的定义、分类和工作原理 . 4