A Low-Profile Wideband Circularly Polarized Crossed-Dipole Antenna
A Low-Profile Wideband Circularly Polarized Crossed-Dipole Antenna
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DOI：
10.1109/lawp.2017.2699975
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发表时间：
2017-01-01
影响因子：
4.2
通讯作者：
Hu, Pengfei
中科院分区：
文献类型：
--
作者：
Yang, Wanjun;Pan, Yongmei;Hu, Pengfei
本文研究了一种低剖面宽带交叉偶极子天线。由四阶矩形贴片组成的双面打印交叉偶极子由一对空置的四分之一打印环馈送，产生圆偏振辐射。两个相邻的轴比(AR)通带由于阶梯形矩形贴片而产生AR<；3分贝，并通过在地平面上添加额外的介质板将它们合并在一起，从而产生非常宽的AR带宽。此外，天线采用了不规则地平面，可以在不涉及高轮廓腔体的情况下，理想地提高孔径增益。为了验证所提出的设计的可行性，制作了一个工作在C波段的样机并进行了测试。模拟结果与实验结果吻合较好。该样机的低轮廓为0.13 nm(0)(根据通带中心频率)，10dB阻抗带宽为66.9%，3dBAR带宽为55.1%，通带内平均增益约为10.4dBic。
A low-profile crossed dipole antenna with wide bandwidth is investigated in this letter. The double-sided printing crossed dipoles consisting of four-stepped rectangular patches are fed by a pair of vacant-quarter printed rings, generating circularly polarized radiation. Two adjacent axial-ratio (AR) passbands with AR < 3 dB are generated due to the stepped rectangular patches, and they are merged together by adding an additional dielectric slab above the ground plane, resulting in a very wide AR band-width. Also, an irregular ground plane is used for the antenna, which can desirably enhance the boresight gain without involving high-profile cavity. To verify the feasibility of the proposed design, a prototype operating at C-band has been fabricated and measured. Reasonable agreement between the simulated and measured results is obtained. The prototype has a low profile of 0.13 lambda(0) (in terms of the center frequency of passband), a 10-dB impedance bandwidth of 66.9%, a 3-dB AR bandwidth of 55.1%, and an average gain of approximately 10.4 dBic within passband.