Satoshi ONO (小野 哲)

We designed and fabricated a microwave transmit ting antenna that uses an HTS
thick disk as a patch antenna with a resonant frequency of around 5.0 GHz. The reflection
property S11, electromagnetic fields, current distributions, and far -field of several resonant
modes in the antenna were analyzed using the CST studio suite. We compared the properties in
several resonance modes and selected the TM11 mode, which has the smallest resonator size
and the highest directivity. The antenna was assembled using a GdBCO thick disk, sapphire
substrates, Cu housing, and SMA connector. We measured t he S11 using a vector network
analyzer and pulse tube refrigerator and found that it had a resonant frequency of 4.996 GHz
and a Qu of 405 at the temperature of 48 K. These measured properties were in good agreement
with the simulated results.

This paper proposes a novel multi-layer substrate integrated
waveguide (SIW) resonator loaded with asymmetric E-shaped slot-lines and shows a tri-band band-pass filter (BPF) using the proposed structure.
In the previous literature, various SIW resonators have been proposed to simultaneously solve the problems of large area and high insertion loss.
Although these SIWs have a lower insertion loss than planar-type resonators using a printed circuit board, the size of these structures tends to be larger. A multi-layer SIW resonator loaded with asymmetric E-shaped slot-lines can solve the above problems and realize a tri-band BPF without
increasing the size to realize further miniaturization. The theoretical design method and the structural design are shown. Moreover, the configured structure is fabricated and measured for showing the validity of the design method in this paper.