查询词典 dipole antenna

It is shown by test results that the loop antenna can eradiate effectively. And it is little- volume, low- cost and high- efficiency.

试验表明，该设计使天线能够有效地将信号发射出去，并且具有体积小，功耗低和效率高等显著优点。

First, we deduce theoretical formulae of calculating equivalent dielectric constant and resonance frequency of rectangular microstrip antennas with air gaps from electromagnetic field theory based on the modified theory of cavity model. Then, we discusses the radiant principle of microstrip antennas on the base of transmission line theory and analyzes the problem of air gaps how to influence pattern and other idiocratic parameters of a microstrip antenna in detail.

本论文的主要工作是根据修改的微带天线的腔模理论，利用电磁场理论推导了具有空气隙的矩形微带天线的等效介电常数和谐振频率的理论计算公式，同时以传输线理论为基础，论述了微带天线的辐射原理。

For the tracking system, the means that can intellectively assist the fault diagnosis and maintenance is significant. Then we can avoid relying heavily on the experiences of the engineers and can reduce the probability of the event that engineers climb up to the antenna with heavy instruments when the faults turn out. For the data channel, to get the high-qualified remote sensing images, we need to get the quantitative data about how the factors influence the BER of Receiver .The data can help the design of receiver and the evaluation of the performance of a receiver. This thesis mainly contains those two parts.

对于跟踪系统，研究一套能辅助系统故障诊断及维护的智能手段是非常有意义的，这样系统维护时可以避免过多依赖技术人员的维护经验，特别是接收天线发生故障时携带仪器攀爬天线的情况；对于数据通道，面对高质量的遥感图像数据要求，我们需要得到影响接收机误码性能的各主要因素对应的量化数据，这些数据对于接收机的设计及性能评估是非常有帮助的。

To handle co-antenna interference, intersymbol interference and intercarrier interference caused by insufficient cyclic prefix, a MMSE-based Turbo per-tone equalization is presented for MIMO OFDM systems in this paper.

摘要在MIMO OFDM系统中，为了对抗同天线干扰及由于保护间隔不足而引起的码间干扰和载波间干扰，该文给出了一种基于MMSE的Turbo子载波均衡器。

In receiving antenna, when a cone-channel condenser is located at the exit pupil of a Keplerian telescope, proper field of view is obtained without tracking system at the receive end, because the receiving optical power of APD will keep stable to a great extent when the incident beam deflects.

发射天线包括准直镜和扩束镜两部分，出射光束发散角压缩到1mrad；接收天线采用非成像光学设计，将接收光锥置于望远系统的出瞳位置，保证了大视场光束的准确接收，从而提高了系统抗干扰能力。

The antenna is connected to a separate board using a dual section variable capacitor and a 660/46 litz wire coil.

天线连接到一个独立的部分，由双连可变电容和用660/46李兹线绕的线圈构成。

What was most-needed was antenna lobing in the vertical direction for accurate elevation information.

令雷达天线能在垂直方向扫描以获得精确的仰角数据仰已变成当务之急。

Most technically exciting was the FD (Mark-4) radar, with the addition of precision elevation sensing by the addition of vertical antenna lobing.

由于增加了垂直方向扫描，它能提供仰角数据。

It can be in the form of spurious signals If the amplitude of these spurious signals is outside agency-reference-recommendation value, they could cause undue disturbances to other users by entering the receiver systems of other RF bands The generation of spurious signals from a transmitter could be the result of imposed varying antenna loads, noisy voltage-supply lines to the stages of the transmitter, or noncontinuous battery-voltage supply to RF energy from the host.

传输器的不稳定是指传输器产生的伪真信号，这种不稳定性的伪真信号的形成出现，如果它们的振幅超过代理服务器允许值就会进入其它波段的接收系统，干扰使用者，强制性的天线改装，伴有嗓音的电压，断续的供电都会产生为伪真信号，有些电池装配线可接收并解调这种能量，并生成嗓音，然后由经供电线路进入主传输器。

The Constant Modulus Algorithm antenna arrays in the GSM systems are analyzed, CMA arrays can overcome the CCI from the intercells and partially overcome the ISI. The CMA is nonsensitive with the phase shift. The CMA criteria having real part and imaginary part can decreased the reliance of the sequentially temporal equalizer and carrier tracking measures

最后本文研究了CMA阵列天线在GSM移动通信系统中应用的可能性，CMA阵列可以有效地克服共道干扰CCI，部分克服码间干扰ISI，这样一种对相位不敏感的盲算法必须进行后处理，考虑复数的实部和虚部的CMA准则能够减少对后序处理的依赖程度。

Dixie itself is a nickname for the American South.

Dixie 本身是美国南部的别称。

I think John Terry epitomises that and a big reaction is what we will be looking for.

而我认为特里就是这样一个典型，他正是我们期望看到的那个领秀。