看不懂，忧闷！求英语高手和有天线基础的帮忙翻译一下更新时间: 2014-01-05 03:12:25 责任编辑: Author_N1
Chapters 2–4 described several MSA configurations for broadband operation.
The BW of the MSA increases with an increase in substrate thickness and
a decrease in the dielectric constant as described in Chapter 2. Also, the BW
of the antenna increases when multiresonators are coupled in planar or
stacked configurations as described in Chapters 3 and 4, respectively.
This chapter combines the above techniques (i.e., planar multiple reso-
nators are stacked on each other using a thick substrate with a low dielectric
constant to realize broadband antennas with a higher gain than the antennas
described in the earlier chapters). This chapter describes several configura-
tions, in which multiple patches are taken in the bottom layer and a single
patch is taken in the top layer. Alternatively, a single patch is placed in the
bottom layer, and multiple patches are taken in the top layer. This is followed
by multiple patches in both the bottom and the top layers. A single patch
with four stacked patches yields broad BW with a high gain [1, 2].
The bottom patch can be excited either by a microstrip line or a
coaxial feed or through electromagnetic or aperture coupling. The method
of excitation influences the bottom patch characteristics and does not signifi-
cantly affect the performance of the stacked patches. Therefore, this chapter
discusses only the coaxial-fed patches, but the concept can be extended to
other types of feeding techniques.
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