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A simple wideband unidirectional antenna with stable symmetrical radiation patterns

机译：具有稳定对称辐射模式的简单宽带单向天线

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摘要

In this paper, a simple wideband unidirectional antenna is proposed. The antenna is originated from the basic magneto-electric (ME) dipole antenna. A pair of half-wavelength horizontal patches are used to excite the basic electric dipole mode. In order to excite the basic magnetic dipole mode, the horizontal patches are extended inward. As a result, the quarter-wavelength vertical patches are well excited and the impedance matching is improved in the high frequency band. In addition, a pair of vertical patches are employed, it can not only reduce the resonant frequency of the basic electric dipole mode but also form a new magnetic dipole mode at low-end frequency. Therefore, the impedance matching in the low frequency band is further improved. The proposed antenna is fabricated and measured. A wide bandwidth of 100% from 2.0 to 6.0 GHz for VSWR <1.5 is obtained. Across the entire bandwidth, the gain is 5.6 ± 1.3 dBi, the front-to-back ratio (FBR) is >10 dB. Moreover, the radiation patterns are stable, symmetrical, and have no side lobe. The proposed antenna is suitable for wideband unidirectional wireless systems.
机译：在本文中，提出了一种简单的宽带单向天线。天线源自基本磁电（ME）偶极天线。一对半波长水平贴片用于激发基本电偶极模式。为了激发基本磁性偶极模式，水平贴片向内延伸。结果，在高频带中改善了四分之一波长垂直贴片，并且在高频带中改善了阻抗匹配。另外，采用一对垂直贴片，它不仅可以降低基本电偶极模式的谐振频率，还可以在低端频率下形成新的磁性偶极模式。因此，进一步提高了低频带中的阻抗匹配。制造和测量所提出的天线。获得了VSWR <1.5的2.0至6.0 GHz的宽带宽度为100％。在整个带宽上，增益为5.6±1.3 dbi，前后比（FBR）> 10 dB。此外，辐射图案是稳定的，对称的，并且没有侧凸。所提出的天线适用于宽带单向无线系统。

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