Hairpin microstrip bandpass filter

Hairpin microstrip line electrically tunable filters

Half wave ceramic filter with open circuit at both ends

Half wave resonator dielectric filter construction having self-s

Half wavelengh and quarter wavelength dielectric resonators coup

Half-wave folded cross-coupled filter

Half-wavelength resonator type high frequency filter

Harmonic filtering device for radio transmitter

Harmonic spurious signal suppression filter

Helical filter

Helical filter with a removable tap housing

Helical filters and methods for specifying assembly thereof

Helical resonator

Helical resonator band pass filter with novel coupling means

Helical resonator filter

Helical resonator filter including short circuit stub tuning

Helical resonator filter with adjustable couplings

Helical resonator filter with dielectric apertures

Helix resonator

Helix resonator filter