NO Type Patent NO Date of Registration Title 1 P a t e n t 212434 99.05.10    Band Pass Filter 2 261039 00.04.15    Directional Coupler With High Directivity 3 270028 00.07.27    Dielectric Resonator 4 313717 01.10.23    Band Pass Filter of Dielectric Resonator Type With Symmetric    Attenuation Poles 5 313718 01.10.23    Microwave of Dielectric Resonator Type With Strong Attenuation 6 354850 02.09.17    Band Pass Filter Using Small Ceramic Resonator 7 360895 02.10.30   Transmission Coupling System and Signal Cancelling Using    Circulator 8 360896 02.10.30    Power Splitter With Adjustable Division 9 368035 02.12.31   Small Ceramic Resonator for Easier Coupling 10 379101 03.03.25    Microwave Device of Dielectric Resonator Type With    Outstanding Attenuation 11 401124 03.09.26    High Temperature Superconductor Low Pass Filter to    Cancel Broadband High Frequency 12 10-2007-32361 08.10.22    Band Pass Filter Using Resonator With Parallel Capacitor   Combination 13 New Design 229889 01.04.27   Dielectric Supporting Structure in Dielectric Resonator 14 235909 01.06.14   Drain Trapping Device of Casing With Communication Module     Country Type Patent NO Title Japan Patent 3477157  Band Pass filter of Dielectric Resonator Type Having Symmetriccally Upper And Lower Notch Points Japan Patent 34743084 Symmetric Ceramic Resonator And Band Pass Filter Using The Same United States Patent 6567648B1 System for Combinning Radio Freqency Transmitter And Receiver Using Circulator And Method For Canceling Transmission Signal Thereof