CN203826555U - 一种基于裂口谐振环的双频带小型化微带天线 - Google Patents
一种基于裂口谐振环的双频带小型化微带天线 Download PDFInfo
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Abstract
本实用新型公开了一种基于裂口谐振环的双频带小型化微带天线，属于天线技术领域。该天线包括辐射部分、介质基板、接地板和馈线，所述辐射部分设置在介质基板之上，包含有金属裂口谐振环和金属辐射贴片；所述金属裂口谐振环无接触地包围金属辐射贴片，所述金属辐射贴片的中心设置在金属裂口谐振环的对称线上且不在其圆心处；所述接地板与介质基板有间隔地平行设置于介质基板正下方；所述馈线包括内芯线和屏蔽层，且馈线上端裸露的内芯线穿过接地层和介质基板与金属辐射贴片连接。本实用新型具有较高辐射效率、增益，并且结构简单、紧凑、生产成本低廉的优点。
Description
技术领域
本实用新型涉及到天线技术领域，尤其涉及一种基于裂口谐振环的双频带小型化微带天线。
背景技术
近年来，伴随着无线通信技术的不断发展，人们对射频前端的天线设计要求不断地提高。微带天线由于制作成本低、重量轻、机械性能高、易于与其它元件共形等优势，受到天线工程师的青睐。微带天线的小型化设计一直是业界不断追求的目标。一般地，对于传统的微带天线，人们通常采用加载集总元件、开槽、曲流等有效手段实现天线的小型化。但这些技术在实现天线小型化的同时，严重限制了天线的带宽、效率以及增益等辐射性能。新型电磁特异材料结构的研究为小型化天线的设计方案开辟了新的途径。国际上利用特异材料结构设计小型化天线的方法主要有以下两类：基于特异材料谐振理论的小型化天线与基于特异材料传输线理论的小型化天线。特别是依据谐振理论设计小型化天线，天线能在不需要任何匹配电路的情况下，直接与50欧姆的信号源产生良好匹配，并具有较高的辐射效率。但是，现有的此类小型化天线大多只能在一个非常窄的频段工作，且为立体结构，不易于集成化设计。
发明内容
本实用新型的目的在于克服上述不足，提供一种基于裂口谐振环的双频带小型化微带天线，它是基于特异材料谐振理论设计小型化天线，具有较高辐射效率、增益，并且结构简单、紧凑、生产成本低廉的优点。
一种基于裂口谐振环的双频带小型化微带天线，包括辐射部分、介质基板、接地板和馈线，所述辐射部分包含金属裂口谐振环和金属辐射贴片，且均设置在介质基板之上；所述金属裂口谐振环无接触地包围金属辐射贴片，所述金属辐射贴片的中心设置在金属裂口谐振环的对称线上且不在其圆心处；所述接地板与介质基板有间隔地平行设置于介质基板正下方；所述馈线包括内芯线和屏蔽层，且馈线上端裸露的内芯线穿过接地层和介质基板与金属辐射贴片连接。
进一步的，所述金属裂口谐振环与金属辐射贴片厚度均为0.01mm～0.05mm。
进一步的，所述接地板为圆形，且其圆心与金属裂口谐振环圆心位于同一纵向轴线上。
进一步的，所述接地板的半径R1为40mm～50mm，其厚度为0.5mm～1mm。
进一步的，所述金属谐振裂口环的外环半径R2为30mm～35mm，内环半径R3为25mm～30mm，裂口宽度W1为3mm～5mm。
进一步的，所述金属辐射贴片为圆形，其半径R4为15mm～20mm，且其圆心与金属裂口谐振环圆心的距离为1mm～2mm。
进一步的，所述介质基板为圆形，其半径与金属裂口谐振环的外环半径相同，且与金属裂口谐振环共圆心。
进一步的，所述介质基板上表面为金属，下表面为非金属，且其介电常数εr为2.2～3.5。
进一步的，所述接地板底部以上部分的剖面厚度H为3mm～4mm。
相较于现有技术，本实用新型一种基于裂口谐振环的双频带小型化微带天线具有以下的显著优点：通过在辐射面增加了一个特异材料谐振器单元裂口谐振环，从而产生了一个低于约传统微带天线三分之一频点处的附加谐振频率，并具有良好的阻抗匹配、辐射效率和边射峰值增益；因此可以使得在复杂的无线通信系统终端收集无线能量具有较高的信噪比、减弱相应的传输损耗。
且相对于现阶段的普通加载，裂口谐振器的加载并没有降低微带天线的工作带宽和辐射效率指标，反而由于裂口环谐振器的第三阶高次模谐振，明显扩展了微带天线原有的阻抗带宽，其辐射方向图保持稳定性。由于该天线简单、紧凑的结构优势，不但可使其应用于各种有限的低尺寸安装平台，如无线传感器、超薄笔记本、智能手机等，且具有低廉的大规模批量生产成本。
附图说明
图1是本实用新型一种基于裂口谐振环的双频带小型化微带天线的整体示意图；
图2是本实用新型一种基于裂口谐振环的双频带小型化微带天线的俯视图；
图3是本实用新型一种基于裂口谐振环的双频带小型化微带天线的侧视图；
图4是本实用新型一种基于裂口谐振环的双频带小型化微带天线的频率与反射损耗|S11|关系图；
图5是本实用新型一种基于裂口谐振环的双频带小型化微带天线在低频段中心频点的E面与H面的归一化辐射方向图；
图6是本实用新型一种基于裂口谐振环的双频带小型化微带天线在高频段第一个中心频点的E面与H面的归一化辐射方向图；
图7是本实用新型一种基于裂口谐振环的双频带小型化微带天线在高频段第二个中心频点的E面与H面的归一化辐射方向图；
其中：1-金属裂口谐振环、2-金属辐射贴片、3-介质基板、4-接地板、5-内芯线、6-屏蔽层。
具体实施方式
下面结合附图对本实用新型作进一步详细描述。
参照图1、图2和图3，一种基于裂口谐振环的双频带小型化微带天线，包括辐射部分、介质基板3、接地板4和馈线，所述辐射部分设置在介质基板3之上，包含有金属裂口谐振环1和金属辐射贴片2；所述金属裂口谐振环1无接触地包围金属辐射贴片2，所述金属辐射贴片2的中心设置在金属裂口谐振环1的对称线上且不在其圆心处；所述接地板4与介质基板3有间隔地平行设置于介质基板3正下方；所述馈线包括内芯线5和屏蔽层6，且馈线上端裸露的内芯线5穿过接地层4和介质基板3与金属辐射贴片2连接。
且所述金属裂口谐振环1与金属辐射贴片2厚度均为0.01mm～0.05mm。
且所述接地板4为圆形，且其圆心与金属裂口谐振环1圆心位于同一纵向轴线上。
且所述接地板4的半径R1为40mm～50mm，其厚度为0.5mm～1mm。
且所述金属谐振裂口环1的外环半径R2为30mm～35mm，内环半径R3为25mm～30mm，裂口宽度W1为3mm～5mm。
且所述金属辐射贴片2为圆形，其半径R4为15mm～20mm，且其圆心与金属裂口谐振环1圆心的距离为15mm～20mm。
且所述介质基板3为圆形，其半径与金属裂口谐振环1的外环半径相同，且与金属裂口谐振环1共圆心。
且所述介质基板3上表面为金属，下表面为非金属，且其介电常数εr为2.2～3.5。
且所所述接地板4底部以上部分的剖面厚度H为3mm～4mm。
在具体实施中介质基板3上表面金属的其厚度均为0.017mm，介质基板3的整体厚度为0.127mm，接地板4的厚度为0.5mm，接地板4底部以上部分的剖面厚度H为3.53mm。接地板的半径R1为46mm，金属裂口谐振环1的外环半径R2＝32.62mm，金属裂口谐振环1的内环半径R3为27.62mm，金属辐射贴片2的半径R4为17mm。参照图2，金属裂口谐振环1的圆心到内芯线5与金属辐射贴片2接触点的距离用L1表示，金属辐射贴片2圆心到内芯线5与金属辐射贴片2接触点的距离用L2表示，故金属裂口谐振环1的圆心到金属辐射贴片2的圆心的距离可以用L1-L2表示，且L1＝8.8mm，L2＝7.7mm，L1-L2＝1.1mm。金属裂口谐振环1的宽度为W1＝4mm。
参照图4，天线的基模中心频率f＝1.575GHz，反射系数是-38.23dB。从1.573GHz-1.578GHz范围内，天线反射损耗|S11|<-10dB，辐射效率高达77.8％；另外，同时在4.52GHz和4.73GHz两个相近的频点产生了两个谐振峰，且辐射效率分别为98.6％和97.9％，且|S11|<-10dB的阻抗带宽相互重叠，形成了一个从4.37GHz-4.79GHz频率范围的阻抗带宽。需要提及的是，一方面，裂口谐振环的高次模谐振提高了该微带天线的固有基模阻抗带宽约24％；另一方面，由于裂口谐振环对辐射贴片的容性耦合，使得贴片的固有基模中心工作频点产生一定的红移。
参照图5，图6和图7，分别给出了天线的E面和H面在不同频段、不同中心频点的归一化辐射方向图，由图可见该天线具有良好、稳定的边射性能，且同时在两个频带具有非常低的交叉极化电平，小于-10dB。
最后说明的是，以上优选实施例仅用以说明本实用新型的技术方案而非限制，尽管通过上述优选实施例已经对本实用新型进行了详细的描述，但本领域技术人员应当理解，可以在形式上和细节上对其作出各种各样的改变，而不偏离本实用新型权利要求书所限定的范围。
Claims (9)
1.一种基于裂口谐振环的双频带小型化微带天线，包括辐射部分、介质基板、接地板和馈线，其特征在于：所述辐射部分包含金属裂口谐振环和金属辐射贴片，且均设置在介质基板之上；所述金属裂口谐振环无接触地包围金属辐射贴片，所述金属辐射贴片的中心设置在金属裂口谐振环的对称线上且不在其圆心处；所述接地板与介质基板有间隔地平行设置于介质基板正下方；所述馈线包括内芯线和屏蔽层，且馈线上端裸露的内芯线穿过接地层和介质基板与金属辐射贴片连接。
2.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述金属裂口谐振环与金属辐射贴片厚度均为0.01mm～0.05mm。
3.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述接地板为圆形，且其圆心与金属裂口谐振环圆心位于同一纵向轴线上。
4.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述接地板的半径R1为40mm～50mm，其厚度为0.5mm～1mm。
5.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述金属谐振裂口环的外环半径R2为30mm～35mm，内环半径R3为25mm～30mm，裂口宽度W1为3mm～5mm。
6.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述金属辐射贴片为圆形，其半径R4为15mm～20mm，且其圆心与金属裂口谐振环圆心的距离为1mm～2mm。
7.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述介质基板为圆形，其半径与金属裂口谐振环的外环半径相同，且与金属裂口谐振环共圆心。
8.根据权利要求7所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述介质基板上表面为金属，下表面为非金属，且其介电常数εr为2.2～3.5。
9.根据权利要求1所述的一种基于裂口谐振环的双频带小型化微带天线，其特征在于：所述接地板底部以上部分的剖面厚度H为3mm～4mm。
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