Ground defines the fixed SPICE node 0. Connect it to the circuit reference. It is a semantic component: it assigns the net name and does not produce a normal component line in the netlist.
A net label gives a wire a fixed text name. Identical names represent one logical net without requiring a long visible wire. Net name should be unique and valid for SPICE.
A port defines a named external RF or hierarchical connection. Impedance sets its reference impedance, commonly 50 ohms. Use clearly named input and output ports for two-port S-parameters.
A subcircuit port declares an external connection for the current schematic. Pin name defines its stable name. The order of these ports forms the schematic's subcircuit interface.
A block with 2–8 pins includes another project schematic as a reusable subcircuit. Parameters are:
- Source schematic — source document;
- Pin count — number of external pins, matching the source subcircuit ports.
Edit the internal circuit in its own document. An instance stores the reference and pin order, while the netlist generator compiles the hierarchy.
A wire is an electrical-connectivity object rather than a drawn line. Intermediate points define its orthogonal route. A junction node represents an independent connection point and participates in marquee selection, group movement, deletion, and undo/redo.