Introduction.- Fundamental of HTS Materials and Microwave Filter Design.- Multi-Band HTS Filter Based on Degenerate Mode Resonator.- Compact HTS Filter Design Based on Controllable Multimode Resonator.- Multi-Band HTS Filters Based on Hybrid-Mode Square Ring Loaded Resonator (SRLR).- HTS Filter Based on Meta-Material Resonator.- Compact HTS Diplexers using Stub-Loaded Resonator.- High-Temperature Superconducting Differential Bandpass Filter (BPF).-...