Study on miniaturized super-gain superconducting antenna

我们研究了超增益超导天线的设计、制作和特性。实验结果如下：（1）建立了工作在微波频段的贴片天线的设计方法，设计了谐振频率为5GHz的贴片天线。我们可以得到铜贴片天线的输入阻抗约为50欧姆和谐振频率为50欧姆。(2)超导贴片天线的制作与特性研究我们利用YBCO薄膜制作了超导贴片天线。这些天线的输入阻抗略大于设计值50欧姆。实验结果与设计值之间的差异是由超导薄膜的表面电阻引起的。超导贴片天线的增益比Au薄膜天线高2-4 dB。（3）等离子体耦合磁控溅射法制备超导天线用YBCO薄膜。在77 K时，薄膜的Tc和Jc分别为87 K和4 × 10 ~（^6）A/cm ~ 2。（4）超导贴片天线的研究设计并制作了超导二元和四元阵列天线。天线的特征在于谐振频率，输入阻抗和增益测量。超导阵列天线的增益比相同几何形状的铜阵列天线高3.2dB。

We have investigated the super-gain superconducting antenna, design, fabrication and characterization. These experimental results are as follows ;(1) Establishment of the design method of patch antenna operated at microwave region.We designed the patch antenna with a resonance frequency of 5 GHz. We could obtain the Cu patch antenna with input impedance of approximately 50 ohms and the resonance frequency of 50 ohms.(2) Fabrication and characterization of superconducting patch antenna.We fabricated the superconducting patch antenna using YBCO thin films. The input impedance of these antenna was slightly larger than that of designed value, 50 ohms. The difference between experimental results and design value was caused by the surface resistance of superconducting film. The gain of superconducting patch antenna was 2-4 dB higher than that of Au film antenna(3) Preparation of YBCO thin films for superconducting antenna using a plasma coupled magnetron sputtering.We fabricated the YBCO thin films for superconducting antenna by a plasma coupled magnetron sputtering. The Tc and Jc of these films obtained were 87K and 4x10^6A/cm^2 at 77K,respectively(4) Study on superconducting patch array antenna.We designed and fabricated the superconducting two and four elements array antennas. The antennas were characterized by resonance frequency, input impedance and gain measurements. The gain of superconducting array antenna was 3.2 dB higher than that of cu-array antenna with same geometry.