EM.Tempo offers the following types of observable (click on each type to learn more about it):
* '''[[Data_Visualization_and_Processing#Probing_Fields_in_Time_and_Frequency_Domains | Field Probe]]''' for monitoring E- and H-field components at a fixed location in both time and frequency domains. * '''[[Data_Visualization_and_Processing#The_Field_Sensor_Observable | Field Sensor]]''' for monitoring E- and H-field components on a cross section of the computational domain in both time and frequency domains.* '''[[Data_Visualization_and_Processing#Far-Field_Observables | Far-Field Radiation Pattern]]''' for monitoring the radiation behavior of your structure.* '''[[Data_Visualization_and_Processing#Computing_Radar_Cross_Section | Far-Field RCS]]''' for monitoring the scattering behavior of your structure.* '''[[Data_Visualization_and_Processing#Graphing_Port_Characteristics Computing_and_Graphing_Port_Characteristics | Port DefinitionCharacteristics]]''' for calculating including the S/Y/Z [[parameters]] and voltage standing wave ratio (VSWR). * '''[[#Exciting_Periodic_Structures_Using_Plane_Waves|Periodic Characteristics]]''' for calculating the reflection and transmission coefficients when your periodic structure is excited by a plane wave source. * '''Domain Energy''' for calculating the total electric and magnetic energy in the computational domain.* '''[[Hybrid_Modeling_using_Multiple_Simulation_Engines#Generating_Huygens_Surface_Data | Huygens Surface]]''' for collecting tangential field data on a box.
Of EM.Tempo's frequency domain observables, the near fields, far fields and all of their associated [[parameters]] like directivity, RCS, etc., are calculated at a certain single frequency that is specified as part of the definition of the observable. To compute those frequency domain data at several frequencies, you need to define multiple observables, one for each frequency. On the other hand, port characteristics like S/Y/Z [[parameters]], VSWR and periodic characteristics like reflection and transmission coefficients, are calculated over the entire specified bandwidth of your project.