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天线测试之Polarization Measurements
2013-5-4 07:06
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- Fundamental to an antenna's radiation pattern is its polarization. On this page, we'll discuss methods and techniques for measuring the polarization of an anten ...
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天线测试之Measuring Phase
2013-5-4 07:05
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- For an antenna's radiation pattern to be completely specified, we need the magnitude of the power received or transmitted, AND the phase. These measurements sho ...
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天线测试之Measuring Gain
2013-5-4 07:04
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- On the previous page on measuring radiation patterns, we saw how the radiation pattern of an antenna can be measured. This is actually the "relative" radiation ...
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天线测试之Measuring Radiation Pattern and an Antenna's Gain
2013-5-4 07:03
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- Now that we have our measurement equipment and an antenna range, we can perform some antenna measurements. We will use the source antenna to illuminate the ante ...
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天线测试Antenna Measurements
2013-5-4 07:00
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- Testing of real antennas is fundamental to antenna theory. All the antenna theory in the world doesn't add up to a hill of beans if the antennas under test don' ...
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天线阵之Thinned Antenna Arrays
2013-5-4 06:56
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- One of the earliest methods of optimizing array geometry dates back to around 1960 and is known as "thinning arrays" or "array thinning". This method is relativ ...
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天线阵之Hexagonal Sampling
2013-5-4 06:55
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- The basic geometry of a 7-element hexagonal array is shown in Figure 1.
Figure 1. Hexagonal Two-Dimensional Antenna Array.
The hexagonal structure is such tha ...
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天线阵之Introduction to Antenna Array Geometry
2013-5-4 06:54
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- We've discussed the basics of antenna arrays and weighting methods in arrays. The performance of an array will depend on the number of elements in the array (ge ...
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天线阵加权之Least Mean-Square Error (LMS) Adaptive Weights
2013-5-4 06:52
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- Antennas (and antenna arrays) often operate in dynamic environments, where the signals (both desired and interfering) arrive from changing directions and with v ...
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天线阵加权之Minimum Mean-Square Error (MMSE) Weights3
2013-5-4 06:51
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- In this section, we'll look at an example using MMSE weights, given by:
We'll consider an array with N=3 elements, with uniform half-wavelength spacing oriente ...
