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首页均匀线阵估计DOA介绍了阵列天线模型和波束形成原理
均匀线阵估计DOA介绍了阵列天线模型和波束形成原理
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更新于2023-05-27
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介绍了阵列天线模型和波束形成原理,介绍了两种不同的DOA估计方法延迟-相加法和Capon算法,并用MATLAB仿真了两种DOA估计算法的性能。
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Antenna Fundamentals
Relevant to RFID Applications
by Jeff Shamblin
- Presentation 1: Characteristics of RFID Reader Antennas
-
Presentation 2: Passive RFID Tag Design
- Presentation 3: Passive RFID Link Analysis

SCS Corp. 2
Antenna Fundamentals
•
This presentation describes antenna parameters important to RFID
applications and has been broken up into three parts to simplify the
discussion
Presentation 1 discusses
antenna characteristics for
RFID reader applications
Presentation 2 discusses
antenna characteristics for
RFID tag applications
Presentation 3 provides a link
equation and explains how the
tag re-radiates energy
ground
RFID tag
antenna
reader
Direct signal
Reflected
signal
h
t
h
a
R

SCS Corp. 3
Presentation 1
Characteristics of RFID Reader Antennas
-
Antenna Characteristics
-
Field Regions: Far-field Definition
-
Antenna Parameters Specific to Toll Booth Applications
-
Multipath Effects (Ground Reflections); Fresnel zones
-
Field Strength Calculations and Requirements For RFID
Applications

SCS Corp. 4
Introduction
•
This presentation has been designed to discuss antenna parameters that
are important for antennas used to satisfy transmit and receive functions of
RFID readers
•
To keep the material at an introductory level, only the antenna parameters
deemed relevant for use with RFID readers are discussed
•
The equations used in this presentation are exact for some scenarios and
approximations for others; but in all instances the equations allow us to
approximate antenna performance or understand a concept such as relating
physical size of an antenna to the beamwidth of the radiated field

SCS Corp. 5
Wavelength and Frequency
•
In the following discussion of antenna parameters, wavelength λ, and
frequency f, will be used extensively; lets define these quantities
•
Antennas radiate energy in the form of electromagnetic waves;
electromagnetic waves travel through free space (air is a good
approximation) at the speed of light
•
Frequency, wavelength, and the velocity that the wave travels are related by
a simple equation:
v = f * λ where v= velocity of the wave
when the wave is traveling in free space
v = c, the speed of light = 2.9979 * 10
8
m/sec
•
We will see that the size of an antenna is closely linked to the wavelength
that the antenna is designed to radiate
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