This paper proposes a compact $4 \times 4$ filtering microstrip patch antenna array with Dolph- Chebyshev distribution implemented by multilayer structure. The proposed antenna array features good filtering performance but contains no extra filtering parts in the feeding or the radiating element. The whole antenna array consists of four $1 \times 4$ antenna subarrays, each subarray is composed of four patch antennas which are coupled-fed by a single microstrip line. Inside the desired passband, by properly choosing the coupling area along the microstrip line, the patches are induced in-phase currents therefore achieving the excellent radiation characteristics. On the other hand, the four patches can’t be properly excited outside the passband which would enable radiation suppression performance. In order to implement a $4 \times 4$ filtering microstrip patch antenna array with low sidelobe level (SLL), four subarrays are combined and fed by Dolphy-Chebyshev excitation method. Finally, the proposed antenna array is implemented, fabricated and measured. The maximum measured gain in the passband is 14.7 dBi, and the radiation suppression outside the passband is better than 25 dB.

中文翻译：

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具有 Dolph-Chebyshev 功率分布的紧凑型 4×4 滤波微带贴片天线阵列

本文提出了一个紧凑的 4美元\乘以4美元多层结构实现的多尔夫-切比雪夫分布滤波微带贴片天线阵列。所提出的天线阵列具有良好的滤波性能，但在馈电或辐射元件中不包含额外的滤波部件。整个天线阵由四个 1美元\乘以4美元天线子阵列，每个子阵列由四个贴片天线组成，它们由一条微带线耦合馈电。在所需的通带内，通过正确选择沿微带线的耦合区域，可以诱导斑块内电流，从而实现出色的辐射特性。另一方面，四个贴片不能在通带之外被适当地激发，这将实现辐射抑制性能。为了实施一个 4美元\乘以4美元低旁瓣电平(SLL)滤波微带贴片天线阵，四个子阵组合馈电，采用Dolphy-Chebyshev激励法。最后，实施、制造和测量所提出的天线阵列。通带内最大实测增益为14.7 dBi，通带外辐射抑制优于25 dB。