描述
在無(wú)線通訊的實(shí)際應(yīng)用中,為有效提高通訊效果,減少天線輸入功率,天線會(huì)做成各種帶有輻射方向性的結(jié)構(gòu)以集中輻射功率,由此就引申出“天線增益”的概念。簡(jiǎn)單說(shuō),天線增益就是指一個(gè)天線把輸入的射頻功率集中輻射的程度,顯然,天線的增益與其方向圖的關(guān)系很大,主瓣越窄、副瓣越小的天線其增益就越高,而不同結(jié)構(gòu)的天線,其方向圖的差別是很大的。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
TERADYNE PCB, TERMINATOR BOARD 950-563-02
TERADYNE PCB, REDUNDANCY ANALYZER 950-665-03
TERADYNE PCB, CATCH RAM 950-660-02
TERADYNE PCB, TESTHEAD EXTENSION 950-710-00
TERADYNE PCB, ADD/CLOCK PE 950-678-01
TERADYNE PCB, VMO MODULE – 256K B 950-596-03
ADVENTEST PCB, DC CONT BGR-016797
TERADYNE PCB, TG MOD 100MHZ ADD/CLK 950-658-00
TERADYNE INC PCB, SYS MON I/F-REPAIRED 950-392-00
TERADYNE INC PCB, VS BYPASS-REPAIRED 950-696-01
TERADYNE PCB, CIA 950-556-00
TERADYNE INC PCB, MEM PAT 950-595-01
TERADYNE INC PCB, CATCH RAM 950-661-03-00-A
TERADYNE INC PCB, TG SUB BIR-021587
TERADYNE INC PCB, CONTROLL CALIB ASSY 950-760-00
TERADYNE INC PCB, TGFC I/F BGR-024356
TERADYNE INC PCB 50MHZ X 165DCS-REPAIRED 950-656-00
ADVANTEST DRIVER, INDEXER 02-30488-REV C
HOST CONTROLLER 200W-REPAIR MEIDN 2-VC-30223
TERADYNE INC PCB, FAIL VECTORMEMORY -REPAIR 950-572-03
TERADYNE PCB MCS ADDR/CLK FORMATTER 99X 950-657-00
ASSY VME/MULTIBUS ADAPTOR W I/F PCB 501-1054 950-303-00
TERADYNE PCB PATGEN SUPPORT TESTER J971 950-558-00/A
TERADYNE PCB DIGITAL CHANNEL SLICE ASYNC 950-563-04
APPLIED MATERIALS (AMAT) QUARTZ BLADE P/N 0200-03195
DELTA TAU PMAC, LITE OPT 4AFLASH RAM 602402-104
APPLIED MATERIALS (AMAT) SLURRY ASSY P/N 0010-14246
AMAT VALVE GATE PNEU ACTR 1.0ID PARTICLE 3870-00381
VAT SERIES 15 PNEUMATIC GATE VALVE – NEW
AMAT TCB,GEO ENG BACKPLANE,PF 8007-0172-000
AMAT COVER TOP PAN, MEG HVM 0040-08918
AXCELIS PCB, SOURCE CONTROL DI EATON 150000790
AMAT FAST CONDENSER PS ASSY 0090-A0332
AMAT TARGET, 300MM, AL, 05.% CU 0190-10799
APPLIED MATERIALS (AMAT) TI-XZ FACEPLATE P/N 0021-01598
AMAT RING, DEPTH NARROW OD 0200-01389
AMAT ADAPTER,INLET,3?/4X7/8, 275-17261-00
KITZ SCT VALVE, ISOLATION HEATED IVBH80SDVXF8A-N?WF-64
NASH_ELMO GAS RING COMPRESS, REGENERATIVE 2BH1400-7AV25
DNS CONTROLLER 2-39-63348 SK2000 MEIDEN UA201/106A
ADVANCED ENERGY POWER SUPPLY, BESC 1000VDC 1303125 E
DNS ASSY, AHL RIGHT SK2000 LID 2-AE-J0163
KOKUSAI HEATER, EXHAUST PIPE NITRIDE SLIM
TEL HEAT EXCHANGE, CS014-000794-1
AMATISO. LEG 4, Master PD 102 CD 4-2 0190-A6161
TEL CONTROLLER, KOMATSU CIRCULATI CS014-000744-1
SIEMENS MICROMASTER 411 DRIVE 480V 6SE6411-6BD22-2?CA1
WHITE KNIGHT FLUID HANDLING AP200 PNEUMATIC PUMP
AMAT ASSY, DISTRIBUTION PANEL, 300MM TEMP 0010-04628
AMAT HEATED PIPELINE,GIS Mnpl 0050-A0131
FUJI AMPLIFER, AC SERVO SPIN DRY 0382-0204
APPLIED MATERIALS (AMAT) LTS, TCB, AUTOFOUCS 8028-0148
VARIAN GATE,VLVE ASSY 45709-00 VAT 08040-FA44-AAV1?/0048
AMAT BRG TO KAYDON DRG 3060-90254
TEL DISK, DELAY WAVE RSY MB3S10-350681-1?1
APPLIED MATERIALS (AMAT) DECEL PSU -6kV QUANTUM 2
AMAT INSERT, SLIT VALVE FOR BUFFER 0021-02747
MICRON MODEL SHOP RECIRCULATOR, NP 2008C
NSK CONTROLLER, SINGLE AXIS EXC20A330T00-04
KENSINGTON PCB, X-AXIS 9200 4000-6002
KENSINGTON PCB ARM 9200 36-4823-0005-02 9407-0748
KENSINGTON PCB ROBOT WAIST 9407-016432 36-4823-0003-02
TEL FEEDTHRU, MAGNETIC COUPLED VACUUM 024-015804-1
AMAT SHIELD, MIDDLE, 12.46 LG 300MM SIP CU 0021-16782
DNS PLATE, HOT (HP) 80B ASSY 2-AE-90076
LAMBDA CONTROLLER, MEGASONIC AMPL 4259601
SHIELD, LOWER CU PENTAGON TECHNOLOGIES 0021-16287 005
AMAT VALVE, THROTTLE(METAL CNTR) 0010-09174-00
AMAT SHIELD, UPPER CU PENTAGON TECHNOLOGIES 0021-16781
TOKYO ELECT FAN, IN LINE BOOSTER CT1380-102881-1?1
AMAT CARD CONTROLLER CPCI 166MHZ PENTIUM 3U 0190-15915
MARTEQ TANK, MEG PROCESS (LMC) QUARTZ 1078064.1.8
TEL SHIELD, DEPO Y-AL D3, PO.8, P35.6 ES3D10-101190-1?1