椭圆形平板天线有结构简单、频带宽、馈电相对简单等优点，可以满足小型化天线同时具有宽频带和高增益的要求。
The elliptical planar monopole antenna has the advantages of simple structure, wide band and relatively simple feed, so it can meet the demands of wide-band and high-gain at the same time.
移动通信的迅猛发展，对应用于无线通信系统的天线提出了小型化、宽频带、多频段工作等要求。
With the great development of wireless communication, there comes great demand of multi-frequency and broadband antennas of compact size.
针对超高频机载合成孔径雷达天线小型化、高增益和宽频带的问题，分析了短背射天线缩小背腔的增益损失。
To meet the requirements of miniaturization, high gain and wideband of UHF antenna for aircraft SAR, the gain loss produced by narrowing back cavity of short back radiation antenna is analyzed.
本文围绕着北京市自然科学基金项目，对智能化宽频带可调谐激光器进行了理论和实验两方面的研究，并初步研制出两台实验样机。
In this paper, we have studied the theory and experiment of intelligent wide-band tunable laser around Beijing Natural Science Foundation Proposed Program and developed two testing laser system.
与传统的移相器相比，MEMS移相器具有频带宽、损耗低、成本低、微型化、易于集成等优点，在微波电路中具有广泛应用前景。
Compared with traditional phase shifter, MEMS phase shifter has many advantages, such as, broadband, low loss, low cost, miniaturization, circuit integration.
该算法的检测性能优于以前提出的多频带归一化匹配滤波器算法。
The new algorithm outperforms the previously proposed multiband adaptive normalized matched filter algorithm.
因此，国内外专家学者对读写器天线的小型化、宽频带、高增益等技术做了广泛而深入的研究。
Therefore, the domestic and foreign scholars have done wide and deep researches on the miniaturization, broadband, high-gain and other technologies of the microstrip antennas.
由此，能够实现介电体装载天线的小型化，并且在该介电体装载天线中，可实现将VSWR的最大值抑制得较小的频率频带的宽频带化。
Thus, the size of the dielectric antenna can be reduced and the dielectric antenna can have a wide range of a frequency band suppressing the maximum value of the VSWR to a small value.
随着机电一体化系统对伺服性能要求的提高，使闭环系统的频带变宽。
With the high requirement of the servo system function by the mechanical-electronic integration system, the band of the closed-loop system becomes wider.
其中，介质谐振天线通过采用共面波导馈电来提高带宽，通过加载倒L形金属片来减小体积，从而实现了宽频带和小型化的目的；
The bandwidth of the DRA is increased by using coplanar-waveguide inductive slot, and the size of the DRA is reduced by loading a L metallic strip on the DR.
其研究主要集中在以下几个方面：小型化，宽频带，多频带。
The researches are mainly focus on aspects as follows: miniaturization, wideband, multi-band.
本文首先介绍了微带天线的理论分析方法和数值分析方法，并总结了微带天线小型化、多频段以及展宽频带的各种技术。
First, this article introduces some theoretical methods and numerical methods to analyze microstrip antenna and sum up some techniques for miniaturization, multi-frequency and broadening the band.
在频段比较高的情况下，天线小型化相对比较容易实现，但要做到宽频带却很难。
It's easy to make antenna smaller for working in high frequency, but rather hard to realize broadband.
在频段比较高的情况下，天线小型化相对比较容易实现，但要做到宽频带却很难。
It's easy to make antenna smaller for working in high frequency, but rather hard to realize broadband.
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