微波无源电路仿真技术(02EM)

1、微波无源电路仿真技术em 仿真器-em sight电子科技大学贾宝富博士勃电&姊枚女尊university of electronic science and technology of chinaemsight introduction to emsight what is emsight applicati ons integration significant benefits best applications building a hybrid coupler (hands on work)什么是emsight21/2d planar simulatorcan determi

2、ne the electrical response of stacked two dimensional layers (2d) with interconnecting vias (+1/2d).spectral domain momx? ax is0.討土064using a numerical technique (method of moments), it solves low level physical rules (maxwelps equations) for a general 2%d structure inside a metal boxlinear simulato

3、rmaterials alloweds parameters are output at the ports specified no active devices are allowed me are solved for the currents on the metal. con ductors (perfect and real) dielectrics (plastics w/ and w/o loss)i emsight元件的仿真electrical portthese are the electrical conn ections to the outside world ems

4、ight determines the signals received at all ports (s parameters) given excitation at one or multiple ports.50/hx 1 s 'xvia port020.1de-embedded portemsight will run a series of calibration standards to eliminate effects due to the metal wall using this portconductorsthis type of port allows an e

5、lectrical port from the bottomeach layer has its own dielectric properties these properties extend across the entire layer (examples: air, uaas, utv etc)planar conductors, can be lossy real conductors such as gold, copper, aluminum什么时候使用emsight performing an em simulation takes lots of time. simulat

6、ion time is not linearly related to structure size. (n cells na2 to na3) em simulation is the most accurate simulation as it applies only low level physical laws (maxwelr s equations) reasons to use when the existing model may not be accurate. no there is no existing model. when concerned if "u

7、ncoupled" parts of circuit are really coupled.得到什么类型的输出port electricalparametersmany formatsavailablesoz_image currents and efieldspage 6em整合到mwo中 method 1: layout is imported into em sight works on general layout structures - imported layouts method 2: extract to em sight from schematic faster

8、 for elements with schematic representation can control multiple extract blocks must exhibit caution 一 "a little too easy" em sight controlled in project browser can look at various em simulations integrate results into graphs, and as subcircuits can access external simulators through em s

9、ocket same /zlook and fee/' as controlling em sightemsight 应用 accurate s parameter models for disconti nuities this is how x models work. create new models (s parameters) for unknown discontinuities planar filters can examine coupling between elements planar antennas天线e=o°z/x70lhcprhcpprinc

10、iple plane cp radiation (db)what happen to the metal boxemsight uses a trick to model antennas. it changes the top surface of the enclosure to be a very lossy metal. so lossy in fact that it looks like the antenna is radiating into freespacethe electric field is sampled at the top of the enclosure t

11、hrough a theorem derived from maxwelps equation (equivalence theorem), equivalent currents can be derived which we place on an in finite ground plane radiation patterns can them be calculated from these currents types of measurementsradiation patterns can be calculated for the following polarization

12、s © 0, rhcp, lhcp, tpwr) and for the following swept parametersfrequency,(|)and 0)平面仿真器(em sight)适用领域 typical board, package, ic planar structures plan ar layers of metal and dielectric plan ar a ntennas structures with well defined ground planes microstrip coplanar typical structures of intere

13、st to rfz microwave designers methods use green' s functions assumes have parallel layers of materials solve for currents on the metal)平面仿真器(em sight)不能用于 non planar structures true "3d" objects: connectors, bond wires,. disc on tinuities in the dielectric edge of the package arbitrary

14、 boxes emsight is a rectangular box. normally, you hope the box effect is negligible. very thick lines but.two lines on top of one another gets close. green7 s functions necessitate: planar dielectric layers to the edge of the box horiz on tai or vertical metal例：建立一个分支线定向耦合器 方法1 -来自版图 build a 3 sect

15、ion 3db branchline coupler using the schematic shown aim to build the "emsight_pl3.einp" project import the "duroid substratepf" simulate 1 to 20 ghz set frequency sweep at circuit schematic level graph s21 and s31 prepare em sight structure simulate the coupler with em sight com

16、pare modelled & em sight simulations look for resonances in the structure3db耦合器原理图msub "3 38h-20 m ii t-.7 rn iir i o- .7taid-.0027e rnom -3.38 name-sublw=75l=100use mtee$po rtpiz- 50 0 b rnm l in id-tl1w-45 m iil-100 m iimtee$id tl3mlin id -tl5 w-w m ii l- l m iiid tl6mtee$ id-tl13mlin id-

17、tl16w - 45 m ii l- 100 m iim l inmlinidtl7iai-10 m iil- l m iiid-tl2w-45 rn iil- 100 m iiportp-4z-50 0 bmmtee$ id-tllm l in id-tl8 w-iai m ii l-l m iimlin id -tl9 w-w m ii l- l rn iimtee5 idtl 10l-l m iimtee$ id-tl1 4portp-3z-50 0 brn建立一个3阶3db分支线耦合器s21 和 s31 >*l i mteex$模型 the "x" means

18、 the model will run em sight in the background to get a good tee model x models are available for comm on disc ontin uities freeze the graph select the graph graph/freeze traces change the mtee$ models to mteex$ models select all mtee$ - use shift for multiple selections. in elements 一 right click m

19、teex$. replace schematic selection reserve parameters resimulatex模式的影响i 备建立一个3阶3db分支线耦合器方法1 create a new em structure right click under the project browser - em structures frequency range change to 10ghz to 20ghz step 1ghz en closure size: 495 mil by 400 mil grid: 99 by 80 dielectric layers: air and

20、 substrate boundaries: top & bottom perfect copy and paste the schematic layout into the enclosure add ports and de-embed check em structures, information . simulate设置周界尺寸 x-dimension (mil) 500 x-divisions 99 y-dimension (mil) 400 y-divisions 80设置介质层 layer 1 thickness (mil) 100er 1loss tan gent

21、0 layer 2 thickness (mil) 20er 3.38 loss tangent 0.0027hint: highlight a row of data then edit values in the edit boxes设置边界条件enclosure top & bottom boundaries perfect conductorenclosureenclosure topboundary modele perfect conductorsubstrate informationboundariesspecify material厂 approximate open

22、 (377 ohms)infinite waveguideenclosure bottomboundary model« perfect conductorspecify material厂 approximate open (377 ohms)k-31 infinite waveguidet op gound plane material | perfect conductorbottom ground plane material | perfect conductorokcancelhelp设置em解算选项select the appropriate em solver opt

23、ionshint: to access em options, right click on em structures in the project tree检验解算选项白国 hybrid em| enclosure=（1）informationsolver informationmemoryvirlualphysicalmax block sizeavailablerequired| 13.68 mbytesn/a| 11.73 mbytes view the em solver information before starting simulationxxxxx preliminary

24、 analysis successfulxxxxxan analysis of your computer resources and the electromagnetic slructure indicate that the simulation should proceed withoul incident. it is always recommended that users save the project before performing extensive rc chc /stroi il rhe okcancel创建端口2i建立一个3阶3db分支线耦合器 simulati

25、on time depends upon: number of frequency points enclosure grid resolution minimum of 3 mesh cells across the narrowest structure mesh across the structure union shapes to avoid interface field calculations reduce mesh on large shapes current animation options switch off if not required em cache mem

26、ory available increase to the recommended size to avoid hard disk delayem结果spars利用有理近似逼近迭代结果el create a circuit schematic 一 em branchline place em structure 1 in as a subcircuit attach ports set the freqs to: 5-20 ghz .01 step project options/intepolationportp-1z-50 oimrational functions/cartesianpo

27、 rtp-3po rtp-lz-50 0 bmcurve is well approximated16111620build a 3 section 3db branchlinecoupler - method 2 work in branchline schematic insert elements to control em sight from schematic elements/simulation control/extract elements/substrates/nsubnsubpoclltih/wr_n layername= sub2extract id=ex 1 em_

28、doc = mem_extra ct_docm name = mem_extractm simulator5 ems ig htx_cellsize=5 mil y_cell_size= 5 mil porttvpe= default nsub = ,sub2,' create_enclosure= yes create_shapes=yes extension= 1 do mil设置nsub修正基片值建立抽取框架(extract block)element options: extract - parasitic extraction control propertiesparame

29、ters statistics display i symbol layout model optionsnamenljls em_docs nameb simulatorhx.cellsize0y_cell_size、b porttype0nsub目 create_en closure目 createshapesq extensionvalueunittuneoptlimitlowerupperdescriptionex1iii厂厂r00element id"em_extr&ct_doc""emextract11emsight5yesyes100milm

30、il厂厂厂厂mil厂厂厂厂厂厂厂0000000name for em simulation aocument name for em simulation document em simulatorenclosure x cell sizeenclosure y cell sizeporttypensubnamecreate enclosurecreate shapeextension distanceem_doc = em structure name in project browser name = name of group of elements to1 be extractedca

31、ncelhelpshow secondaryelement helpven dor help设置被抽取的元件 select all elements right click over an element / properties model options/ em extraction options 一 enable group name: em_extract (must match name in extract block)被抽取元件w=75l=10dmgu bb-3.38h-20 milt-0.7 mlrho-0.7 tarri-oj0o27 bnom-3.3s marne-ou b il>mteefid-7l3mteej i