CN102280704A - 一种宽波束宽度小尺寸的圆极化天线 - Google Patents

一种宽波束宽度小尺寸的圆极化天线 Download PDF

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CN102280704A
CN102280704A CN2011101245661A CN201110124566A CN102280704A CN 102280704 A CN102280704 A CN 102280704A CN 2011101245661 A CN2011101245661 A CN 2011101245661A CN 201110124566 A CN201110124566 A CN 201110124566A CN 102280704 A CN102280704 A CN 102280704A
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polarized antenna
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吴壁群
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Guangdong Broadradio Communication Technology Co Ltd
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本发明公开了一种宽波束宽度小尺寸的圆极化天线，它包括方形贴片，其上设有两个相互正交的终端开路的刻槽，贴片通过一同轴线固定在一方形的接地反射面上。反射面上有四个终端开路的短路柱状物，从而减少了反射面的尺寸。本发明使用单馈电技术来激发两个正交刻槽工作在圆极化模式下。本发明的阻抗带宽达到19%（驻波比小于2），3dB轴比带宽达到3.8%。在轴比带宽内，它的3dB波束宽度达到101.4°±1.4°，增益达到5.76dBi±0.18dBi。具有天线尺寸紧凑，重量轻，造价低，制作容易，尤其是具有阻抗带宽好、辐射波束非常宽、高增益的优点，可以广泛用于卫星通信和交通导航。

Description

一种宽波束宽度小尺寸的圆极化天线
技术领域
本发明涉及圆极化天线，尤其是涉及一种宽波束宽度小尺寸的圆极化天线。
背景技术
近年来，雷达、全球定位系统、蜂窝通信等无线电通信技术发展迅猛。对无线电通信持续增长的需求使越来越多的研究者投入到无线电通信系统的创新开发之中。在无线电通信系统中，天线是一个核心元件。和线极化天线相比，圆极化天线具有更宽的接收和发射方位角，更好的移动性，以及更好的天气适应性等优点，所以被更广泛地应用在无线电通信当中。
卫星通讯要求圆极化天线具有宽视场角，一些特殊的设备甚至要求圆极化天线的波束宽度达到100°以上。同时，圆极化天线还必须具有高增益以及在正负10°的范围内都以圆极化方式工作（低轴比）。由于大部分卫星系统要求重量轻、尺寸紧凑、成本低以及容易实现量产，所以和其它圆极化天线相比，贴片天线特别适合与卫星通信。
通常，圆极化天线可以划分为两种类型：一种是单馈电形式的圆极化天线，另一种是双馈电形式的圆极化天线。单馈电天线的结构相对简单，因为它不需要外部馈电网络来提供两个正交振荡模。然而，传统的单馈电天线的轴比带宽非常窄（1%或者更小）。提高轴比带宽的方法之一是在辐射器上面添加刻槽。Ka-Lam Lau,Hang Wong and Kwai-Man Luk，在《A full-wavelength circularly polarized slot antenna》（刊载于IEEE Trans.Antennas Propagat.，vol.54,no.1,pp.741-743,Feb.2006）提出用正交刻槽来达到超过5%的轴比带宽和11dBi的增益，但是其天线尺寸过大。
发明内容
本发明所要解决的技术问题是克服上述现有技术中的缺陷提出一种能实现更大的尺寸缩小幅度且产生非常宽的宽波束宽度小尺寸的圆极化天线。本发明所要进一步解决的技术问题是克服上述现有技术中单馈电圆极化天线轴比带宽非常窄的缺陷，提出一种轴比带宽比较宽的圆极化天线。
本发明的技术问题是这样加以解决的：
一种宽波束宽度小尺寸的圆极化天线，包括接地反射面、介电质基板、覆盖于介电质基板一侧的金属贴片、一连接接地反射面和金属贴片的同轴线；所述方形金属贴片上设有两个呈正交分布的终端开路的刻槽。
上述圆极化天线进一步优化的技术方案是，所述接地反射面为方形接地反射面，所述金属贴片为方形金属贴片。
上述圆极化天线进一步优化的技术方案是，所述介电质基板的相对介电常数为2.33，尺寸为0.316λ×0.316λ，其中λ为天线工作波长。
上述圆极化天线进一步优化的技术方案是，所述方形金属贴片刻槽的长度为0.316λ，两个呈正交分布的所述刻槽将金属贴片以正交点为中心按顺时针方向分割为第一矩形贴片、第二矩形贴片、第三矩形贴片和第四矩形贴片，其中第一矩形贴片和第四矩形贴片的尺寸相同，均为0.020λ×0.156λ；第二矩形贴片和第三矩形贴片C的尺寸相同，均为0.293λ×0.156λ，其中λ为天线工作波长。
上述圆极化天线进一步优化的技术方案是，所述介电质基板的相对介电常数为2.33，厚度为1.57mm，所述方形金属贴片刻槽的宽度为0.30mm。
上述圆极化天线进一步优化的技术方案是，所述介电质基板与金属贴片通过所述同轴线支撑于所述接地反射面之上；同轴线的外壳与第二矩形贴片相连接，同轴线的轴线通过一直交铜桥与第四矩形贴片相连接。
上述圆极化天线进一步优化的技术方案是，所述接地反射面的四个角出各连接有一个终端开路的短路柱状物，柱状物的轴线垂直于接地反射面且与上方的金属贴片的边缘角对齐，短路柱状物的高度小于所述接地反射面与介电质基板的垂直距离。
上述圆极化天线进一步优化的技术方案是，所述接地反射面的尺寸为0.394λ×0.394λ, 柱状物的高度为0.138λ，其中λ为天线工作波长。
上述圆极化天线进一步优化的技术方案是，所述接地反射面与介电质基板的垂直距离为0.143λ，其中λ为天线工作波长。
上述圆极化天线进一步优化的技术方案是，所述直交铜桥的短边为1.00mm，长边为5.40mm。
上述技术方案中，通过在金属贴片上设刻槽，电流必须绕过金属贴片上的刻槽，这样可以增长电流路径，有效地缩小天线的尺寸，降低工作频率，获得很宽的波束宽度。直交铜桥的作用是正交刻槽的激励源。电流在金属贴片上的流向是依次从第一矩形贴片到第四矩形贴片到第三矩形贴片再到第二矩形贴片，和右旋圆极化波的方向一致。所述柱状物就像是接地反射面在垂直方向上的延伸，电流在上面的流向同样遵循逆时针方向，从而产生了另一个右旋圆极化波，大大提高了天线的波束宽度。所述介电质基板的厚度为1.57mm，相对介电常数为2.33，并非高值，却使天线能保持约3.8%的轴比带宽，大于一般单馈电天线的1%。
总的来说，本发明与现有技术相比具有如下优点：本发明通过在金属贴片上设置正交刻槽和直交铜桥，在发射面上设置柱状延伸物，获得很宽的波束宽度，兼顾使天线保持很小的尺寸以及较宽的轴比带宽。具有天线尺寸紧凑，重量轻，造价低，制作容易，尤其是具有阻抗带宽好、辐射波束非常宽、高增益等优点，可以广泛用于卫星通信和交通导航。
附图说明
图1是具体实施方式中宽波束宽度小尺寸的圆极化天线的立体视图。
图2是具体实施方式中宽波束宽度小尺寸的圆极化天线的俯视图。
图3是圆极化天线在3.9GHz工作频率下的仿真辐射方向性图。
图4是圆极化天线在3.9GHz工作频率下去掉短路柱状物后的仿真辐射方向性图。
图5是圆极化天线在3.9GHz工作频率下去掉短路柱状物并加上四个侧壁后的仿真辐射方向性图。
图6是圆极化天线的驻波比和增益随工作频率变化而变化的仿真和实物测量函数图。
图7是圆极化天线的轴比随工作频率变化而变化的仿真和实物测量函数图。
图8a是圆极化天线在3.87GHz工作频率下的仿真测量辐射方向性图。
图8b是圆极化天线在3.87GHz工作频率下的实物测量辐射方向性图。
图8c是圆极化天线在3.9GHz工作频率下的仿真测量辐射方向性图。
图8d是圆极化天线在3.9GHz工作频率下的实物测量辐射方向性图。
图8e是圆极化天线在3.93GHz工作频率下的仿真测量辐射方向性图。
图8f是圆极化天线在3.93GHz工作频率下的实物测量辐射方向性图。
图8g是圆极化天线在3.96GHz工作频率下的仿真测量辐射方向性图。
图8h是圆极化天线在3.96GHz工作频率下的实物测量辐射方向性图。
图8i是圆极化天线在3.99GHz工作频率下的仿真测量辐射方向性图。
图8j是圆极化天线在3.99GHz工作频率下的实物测量辐射方向性图。
具体实施方式
下面结合附图并结合具体实施方式以及仿真和实物测量结果对本发明作进一步说明。
如图1、图2所示，一种宽波束宽度小尺寸的圆极化天线，是一个金属贴片天线和反射面的组合，两者通过同轴馈电线连接，所述圆极化天线包括介电质基板以及覆盖于其上的金属贴片1、接地反射面4、一连接金属贴片和反射面的同轴线6。
所述介电质基板的厚度为TSUB=1.57mm，相对介电常数为2.33。
所述方形金属贴片1的尺寸为PxP=0.316λx0.316λ，其上有一对正交刻槽2，刻槽的宽度为G=0.02mm，该对正交刻槽将金属贴片以交点为中心按顺时针方向分割为第一矩形贴片A、第二矩形贴片B、第三矩形贴片C、第四矩形贴片D四片矩形贴片，其中第一矩形贴片A、第四矩形贴片D的尺寸相同，为P1xP2=0.020λx0.156λ，第二矩形贴片B、第三矩形贴片C的尺寸相同，为P3xP2=0.293λx0.156λ，其中λ为天线工作波长。
所述方形金属贴片1上还有一直交铜桥3，铜桥的尺寸为SLxSW=0.013λx0.070λ, 其中λ为天线工作波长。铜桥一端与同轴线的轴线相连接，另一端与贴片D相连接，也就是将贴片D与同轴线的轴线连接起来，直交铜桥的作用是充当刻槽产生圆极化波的激励源。
所述接地反射面4的尺寸为GDxGD=0.394λx0.394λ,它与介电质基板的垂直距离为H=0.143λ。在接地反射面4的四角还各有一根终端开路的短路柱状物5，短路柱状物的高度为Hsp=0.138λ，其中λ为天线工作波长。柱状物的轴线与方形贴片的相对边缘对齐（如图2，轴线位于边缘角端）。
所述同轴线6的外壳与贴片B相连接，轴线通过直交铜桥与贴片D相连接。
以上λ=76.92mm，为天线的工作波长，对应工作频率为3.9GHz。
仿真及实物测量结果
本实施方式使用网络分析仪Agilent E5071C Network Analyzer进行驻波测量，使用天线测试系统SATIMO Near-field Measurement System 进行方向图跟天线增益测量。
该天线工作时，最大电流密度沿着两条正交刻槽分布，而电流的方向是沿着贴片A→D→C→B的顺序，和右旋圆极化波的旋转方向一致。
如图3的仿真结果所示，在3.9GHz工作频率下，本发明的3dB波束宽度达到102.5°且后瓣增益小于-15dB。将图3与图4进行比较可见，去掉短路柱状物后，天线不再是定向天线，这时反向辐射占据了主导地位，所以短路柱状物可以增强天线的单向性。将图3与图5进行比较可见，带短路柱状物的天线比带侧壁的天线有更好的辐射图样、低后瓣、低正交极化以及更好的阻抗匹配等优点。
如图6所示，本发明在3.5GHz到4.45GHz范围内的仿真阻抗带宽约为23.9%（驻波比小于2），而在3.5GHz到4.25GHz范围内的实物测量带宽约为19.3%（驻波比小于2）。实物测量的驻波比在高频带有轻微失配。实物测量的平均增益为5.76dBi，比仿真结果低约0.8dBi。
如图7所示，本发明在3.77到4.05GHz范围内的仿真轴比带宽约为7.2%，而在3.85到4.0GHz范围内的实物测量轴比带宽约为3.8%。
如图8a-图8j所示，本发明在各工作频率下其3dB轴比带宽内的波束宽度都达到100°以上，且在Φ=0°和Φ=90°平面内都达到这个波束宽度。此外，辐射方向性图都稳定且近似对称，具有良好的方向性。表1取了测量频率范围的最大最小值，进一步说明了在这两个频率的波束宽度。
表1 
Figure 412864DEST_PATH_IMAGE001
 本具体实施方式的圆极化天线尺寸较小，长x宽x高仅为24.3mm x 24.3mm x 11mm（约0.32λx0.32λx0.14λ），3dB波束宽度达到101.4°±1.4°，增益达到5.76dBi±0.18dBi，阻抗带宽达到19%（驻波比小于2），3dB轴比带宽达到3.8%。可以广泛用于卫星通信和交通导航。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明由所提交的权利要求书确定的发明保护范围。

Claims (10)

1.一种宽波束宽度小尺寸的圆极化天线，其特征在于包括接地反射面、介电质基板、覆盖于介电质基板一侧的金属贴片、一连接接地反射面和金属贴片的同轴线；所述方形金属贴片上设有两个呈正交分布的终端开路的刻槽。
2.根据权利要求1所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述接地反射面为方形接地反射面，所述金属贴片为方形金属贴片。
3.根据权利要求2所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述介电质基板的相对介电常数为2.33，尺寸为0.316λ×0.316λ，其中λ为天线工作波长。
4.根据权利要求3所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述方形金属贴片刻槽的长度为0.316λ，两个呈正交分布的所述刻槽将金属贴片以正交点为中心按顺时针方向分割为第一矩形贴片、第二矩形贴片、第三矩形贴片和第四矩形贴片，其中第一矩形贴片和第四矩形贴片的尺寸相同，均为0.020λ×0.156λ；第二矩形贴片和第三矩形贴片C的尺寸相同，均为0.293λ×0.156λ，其中λ为天线工作波长。
5.根据权利要求4所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述介电质基板的相对介电常数为2.33，厚度为1.57mm，所述方形金属贴片刻槽的宽度为0.30mm。
6.根据权利要求4所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述介电质基板与金属贴片通过所述同轴线支撑于所述接地反射面之上；同轴线的外壳与第二矩形贴片相连接，同轴线的轴线通过一直交铜桥与第四矩形贴片相连接。
7.根据权利要求1~6任一项所述的宽波束宽度小尺寸的圆极化天线，其特征在于    所述接地反射面的四个角出各连接有一个终端开路的短路柱状物，柱状物的轴线垂直于接地反射面且与上方的金属贴片的边缘角对齐，短路柱状物的高度小于所述接地反射面与介电质基板的垂直距离。
8.根据权利要求7所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述接地反射面的尺寸为0.394λ×0.394λ, 柱状物的高度为0.138λ，其中λ为天线工作波长。
9.根据权利要求8所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述接地反射面与介电质基板的垂直距离为0.143λ，其中λ为天线工作波长。
10.按照权利要求9所述的宽波束宽度小尺寸的圆极化天线，其特征在于所述直交铜桥的短边为1.00mm，长边为5.40mm。
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《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 20060228 Ka-Lam Lau et al. A Full-Wavelength Circularly Polarized Slot Antenna 第54卷, 第2期 *
KA-LAM LAU ET AL.: "A Full-Wavelength Circularly Polarized Slot Antenna", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 *

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