清楚明确
发表于 2025-3-21 17:38:27
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令人悲伤
发表于 2025-3-22 00:09:20
Definitions of Critical Parameters for Antenna operation, frequency response) and the radiation characteristic (or radiation pattern). Usually, frequency response is considered first because without a reasonable input impedance match, a transmitting system may suffer from severe reflections that could damage other components and waste power, whereas recei
轻打
发表于 2025-3-22 00:49:03
Linkage Between Frequency Response and Radiation Characteristics: Implications for Reconfigurable Aistinct characteristics in both, as described in Chapter 2. The way antennas function as parts of circuits has direct consequences for how they behave as radiators, and vice versa. This, of course, leads to the conclusion that the reconfiguration of one property, say, frequency response, will have a
Shuttle
发表于 2025-3-22 07:54:49
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Thyroxine
发表于 2025-3-22 10:56:28
Methods for Achieving Radiation Pattern Reconfigurability, radiation is typically characterized with a set of two-dimensional radiation patterns taken from major cut planes of interest, with three-dimensional patterns used occasionally to obtain a qualitative assessment of the antenna’s performance. In this lecture, we will typically examine cut planes of
竞选运动
发表于 2025-3-22 13:20:21
Methods for Achieving Compound Reconfigurable Antennas,tics. Indeed, this ability to independently select operating frequency, bandwidth, and radiation pattern characteristics is the ultimate goal of reconfigurable antenna designers. Recently, several groups have achieved this kind of reconfigurability, here termed
foreign
发表于 2025-3-22 20:03:54
Conclusions and Directions for Future work, However, there are still very few reconfigurable antennas in use today. Why? There are several answers to this question, and they each point to a promising area of future research and development in this field.
使更活跃
发表于 2025-3-23 00:22:44
Introduction, category possesses inherent benefits and detriments that make them more or less suitable for particular applications. When faced with a new system design, engineers change and adapt these basic antennas, using theoretical knowledge and general design guidelines as starting points to develop new structures that often produce acceptable results.
deforestation
发表于 2025-3-23 02:07:38
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CODA
发表于 2025-3-23 07:09:24
Book 2007nced techniques and examples that offer important new capabilities for next-generation applications. Antennas are necessary and critical components of communication and radar systems, but sometimes their inability to adjust to new operating scenarios can limit system performance. Making antennas rec