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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >A small single fed broadband circularly polarized slot antenna
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A small single fed broadband circularly polarized slot antenna

机译：小型单馈宽带圆极化缝隙天线

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In this research, we present a simple single fed small broadband circularlypolarized (CP) antenna. The proposed structure has the advantage of simultaneouslyobtaining broadband ARBW and IMBW in a small size(0.64λ × 0.62λ × 0.01λ), where λ is the free-space wavelength at the center frequency.The measured S11 BW is 100% (2.15-6.44 GHz), which is completelyoverlapped by the measured ARBW of 108.7% (2.09-7.07 GHz), which arewider than most published papers. The antenna consists of an off-centermicrostrip feed line, an inverted rectangular bracket-shape (IRBS) parasiticstrip, and a modified ground plane. The modified ground plane has threelinked slots and a protruded L-shaped stub (LSS). The IRBS parasitic strip andthe feed line are on one side of the substrate, whereas the ground plane is onthe other side. The IRBS and LSS are overlaid up and down. The novelties ofthe structure are that the design mechanics is simple and clear as follows:(a) The three linked slots make the ground asymmetrical, and the asymmetricalground makes the broadband IMBW in a small size preliminarily formed.Though the AR is around 8 dB, the fluctuation of AR inside the operation frequencyband is little. (b) The off-center feeding line, IRBS parasitic strip, andthe LSS chain together through capacitance coupling, and the current path isformed, then the AR below 3 dB in the whole frequency band is generated.The peak gain and radiation efficiency are of 5.5 dBi and 95%, respectively.The proposed antenna is a good candidate for the application of various wirelesscommunication systems, such as WLAN, WiMAX, and RFID.
机译：在这项研究中，我们提出了一种简单的单馈小型宽带圆极化（CP）天线。所提出的结构的优点是可以同时获得小尺寸（0.64λ×0.62λ×0.01λ）的宽带ARBW和IMBW，其中λ是中心频率的自由空间波长。测得的S11 BW为100％（2.15- 6.44 GHz），与实测的108.7％（2.09-7.07 GHz）的ARBW完全重叠，比大多数已发表的论文都宽。该天线由一条偏离中心的微带馈线，一个倒置的矩形托架形（IRBS）寄生带和一个修改的接地平面组成。修改后的接地平面具有三个链接的插槽和一个凸出的L形短截线（LSS）。 IRBS寄生带和馈线在基板的一侧，而接地层在另一侧。 IRBS和LSS上下重叠。该结构的新颖之处在于设计机制简单明了：（a）三个相连的插槽使地面不对称，而不对称的地面则初步形成了小尺寸的宽带IMBW，尽管AR约为8 dB， AR在工作频带内的波动很小。 （b）偏心馈线，IRBS寄生带和LSS通过电容耦合连接在一起，形成电流路径，然后在整个频段内产生3 dB以下的AR，峰值增益和辐射效率分别为分别为5.5 dBi和95％。拟议的天线是WLAN，WiMAX和RFID等各种无线通信系统应用的理想选择。

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