天线的方向系数可由下式求得：
3.方向系数
f(Δm1,φ) 和 Rr 二者应归算于同一电流。
对双极天线而言，Rr=R11-R12，R11是振子的自辐射电阻，R12是振子与其镜像之间（相距2H）的互辐射阻抗。
2022-12-22 19:37:12
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在微波暗室内对基站天线进行测试是一种常用的方法。由于暗室尺寸的限制，对增益较高的天线，往往不能满足远场测试条件。本报告给出了一种由准远场距离上测得的方向图计算远场方向图的方法。
2022-12-21 21:55:37
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提出了一种用于测量微波信号功率的新颖结构。 它测量通过MEMS膜从CPW线耦合的微波功率。 在这种方法中，信号在功率检测期间可用。 功率传感器的制造与GaAs MMICCraft.io兼容。 给出了该传感器的设计，制造和实验结果。 实验结果表明，该传感器在12 GHz以下的反射小于-15 dB，插入损耗小于2.0 dB。 这种功率传感器在10 GHz频率下的总灵敏度为10.4νVmW-1。 ？ 2007 IOP出版有限公司
2022-12-20 17:26:56
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he products that drive the wireless communication industry, such as cell phones and pagers, employ circuits that operate at radio and microwave frequencies. Following on from a highly successful first edition, the second edition provides readers with a detailed introduction to RF and microwave circuits. Throughout, examples from real-world devices and engineering problems are used to great effect to illustrate circuit concepts.
* Takes a top-down approach, describing circuits in the overall context of communication systems.
* Presents expanded coverage of waveguides and FT mixers.
* Discusses new areas such as oscillators design and digital communication. *An Instructor's Manual presenting detailed solutions to all the problems in the book is available from the Wiley editorial department.
2022-12-17 17:15:00
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