-
-
公开(公告)号：JPS5814602A
公开(公告)日：1983-01-27
申请号：JP11391381
申请日：1981-07-20
Applicant: MATSUSHITA ELECTRIC IND CO LTD
Inventor： TSUMURA MASAKATSU , ISHIKAWA KOUKICHI , FUJI TSUNEJI
Abstract: PURPOSE:To improve the cutoff performance at the high frequency side, by insulating an end of each of >=2 parallel resonators consisting of coils and capacitors froem a shielding case to connect them to each other and opening the other end respectively. CONSTITUTION:A shielding case 8 contains 4 rooms 11 and 12, and the rooms 11 at both ends of the case 8 include the parallel resonators 15 and 15' with the capacitors 14 and 14' connected to both ends of the coils 13 and 13', and an input winding 16 and an output winding 17 with an end connected to the case 8 and the other end insulated from the case and then drawn outside respectively. A coupling window 18 is formed to a partition wall 9 between the room 11 and the center room 12, and the parallel resonators 21 and 21' consisting of the coils 19, 19' and the capacitors 20, 20' connected to both ends of the coils 19 and 19' are disposed in the room 12. As no window is provided to a partition wall 10 of the room 12, the resonators 21 and 21' are separated from each other in terms of the electric field. Then an end of each of the resonators 21 and 21' is connected to each other to have an electromagnetic connection. The other end of each of the resonators 21 and 21' is opened, and a trap circuit is formed for connection of capacity by means of the capacity between the resonators 21/21' and the case 8.
-
-
-
公开(公告)号：JPS5553914A
公开(公告)日：1980-04-19
申请号：JP12803478
申请日：1978-10-18
Applicant: FUJITSU LTD
Inventor： DOUI YOSHIKAZU , FURUYA OSAHISA , TAKAHARA TOSHIO
Abstract: PURPOSE:To secure passing only for the basic wave by forming the filter circuit with the fixed curcuit constant, thus absorbing the higher harmonic into the filter circuit with no reflection toward the input side. CONSTITUTION:Line 2 of characteristic impedance Z0 and featuring the length of lambdaS/8, lambdaS: basic wavelength at pass band, resistance 4 featuring resistance value R0 equal to impedance Z0 plus lines 5 and 6 featuring lambdaS/4 length are provided between input/output ports 1 and 3. Thus the filter circuit is formed. Now with supply of the signal featuring basic wave frequency fS from port 1, signal fS has virtually no attenuation to pass through port 3. Then with supply of 2nd higher harmonic 2fS, line 6 is short-circuited to then feature the open state when viewed from port 1. On the other hand, line 5 is short-circuited to the earth end. Thus this circuit is terminated by resistance R0 to signal 2fS. In such way, the blocked signal is not reflected but absorbed by resistance 4.
-
Patent Agency Ranking
公开(公告)号：JPS5544293A
公开(公告)日：1980-03-28
申请号：JP9313979
申请日：1979-07-20
Applicant: THOMSON CSF
Inventor： PIEERU DOU BAIZE , PIEERU FUREEZU , IBU RU NOAITSUKU
-
-
-
-
-
-
Search Results
1121
records
(took 0.021 seconds)
