【摘 要】
：
Characteristics of a single-feed dual-frequency bow-tie microstrip antenna are studied. By using the variation method, simple formulas for resonant frequencies
【机 构】
：
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, P.R. Chin
论文部分内容阅读
Characteristics of a single-feed dual-frequency bow-tie microstrip antenna are studied. By using the variation method, simple formulas for resonant frequencies of the bow-tie microstrip antenna are derived. It is shown that the dual-frequency ratio can be controlled easily by choosing the parameters of the antenna. This design gives compact antenna size and simple antenna structure. Experimental results are presented, verifying the validity of the design.
其他文献
An infinite number of semi-discrete and continuous conservation laws for the differential-difference KP equation were obtained by using a solvable generalized R
时间的行走里,选择具有强大的真切意义.rn所以我们看到了昨天和今天,也会在后来的某一天看到之前的一些天.这是时间选定的现实.不过,时间不会主动选择,它会在一定的时间内主
梅,《本草纲目》载:“梅古文作杲,象子在木上之形.梅乃杏类,故反杏为杲.书家讹为甘木.后作梅,从每,谐声也.”由于地域和文化的差异,梅又有干枝梅(北京)、春梅(南通)、青梅、
德国著名摄影家奥古斯特·桑德这样讲述他的摄影:“请让我以最真诚的方式来讲述我们这个时代的真相.”约翰·伯格也在自己对桑德的描述中试图谈论那些“被看见”的“真相”,
近些年来,教育的发展逐渐形成多元化,不仅局限于学校教育,家庭教育也应该受到高度重视.教育,不单单是学校教师的任务,也是全社会的任务,需要学校和社会共同努力.目前,在农村
“认识百军,少说也快四十年了吧,而他从事摄影的时间,比我认识他还要早得多.rn这里展出的许多照片,曾经令我为之纳罕:作为一个常年工作在基层的摄影宣传干部,他居然早早地就
Based on rational Bézier curves given by Ron Goldman, a new fractional rational Bézier curve was first defined in terms of fractional Bernstein bases. Moreove
An extension of the Lie algebra An-1 has been proposed [Phys. Lett. A, 2003, 310:19-24]. In this paper, the new Lie algebra was used to construct a new higher d
n-soliton-like solutions of three non-isospectral equations, the non-isospectral mKdV equation, the non-isospectral sine-Gordon equation and the non-isospectral
基金项目：英美文学课程教学改革与英语专业学生人文素养，项目编号：2017101901。 摘 要：雪莱是英国文学史上颇具才华的诗人，被誉为“诗人中的诗人”。他一生追求自由、平等，写下了大量诗篇。其中，以抒情诗最具代表性。他的博爱情怀不仅体现在对大自然的热爱，也体现在对民众疾苦的关切，以及对纯粹爱情的执着。 关键词：雪莱;抒情诗;博爱 作者简介：李珊（1985-），女，汉族，安徽安庆人，讲师，硕