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antenna motors inverter technology energy conversion structure of inverter device variable-frequency variable frequency drectional radiation pattern lobes isotropic beamwidth omnidirectional radiation power density radiation intensity directivity antenna gain properties of antenna radiation pattern antenna efficiency atenna parameters principal patterns stepper pwm stepper motor motor permanent magnet stepper motor hybrid stepper motor variable reluctance stepper motor special types of motor microstepping half stepping permanent magnet motor dc motor pmdc special types of motors advantages disadvantages inverter energy loop antennas equivalent circuit of loop antennas electrically small loop antenna ferrite loop small loop antenna large loop antenna constant and non constant current loop antennas linear array planar array circular array elements of antenna travelling wave frequency-independent antennas broadband antennas pcb antenna pcb microstrip antenna aperture antenna horn antenna inverter motor radiation efficiency beam efficiency bandwidth maximum effective area polarization input impedance maximum directivity friis transmission equation antenna temperature friis equation dipole small dipole infinitesimal dipole finite length dipole linear wire half wave diploe linear antenna lens antenna