Tuner unit having electromagnetically isolated UHF and VHF section with no noise
AssigneeNEC Corporation
InventorsYoshiharu Terada, Isao Horie
Life of this patent
Estimating the term…
Abstract
In a tuner unit including an antenna input filter section, a UHF section, a VHF section, and a PLL section which are electromagnetically separated by walls, an inductor for a VHF local oscillator is disposed adjacent to the UHF section, and is electromagnetically separated by a subdivision wall from the UHF section and the VHF section.
Claims22
A tuner unit having an antenna input filter section, an ultra-high frequency (UHF) section connected to said antenna input filter section, a very-high frequency (VHF) section connected to said antenna input filter section, and a phase-locked loop (PLL) section connected to said UHF section and said VHF section, comprising:
- first and second end walls approximately parallel to each other;
- first and second side walls approximately parallel to each other and coupled to said first and second end walls;
- a first separating wall approximately parallel to said first and second end walls and coupled to said first and second side walls, said antenna input filter section being defined by said first end wall, said first and second side walls and said first separating wall;
- a second separating wall approximately parallel to said first and second side walls and coupled to said first separating wall and said second end wall;
- a third separating wall approximately parallel to said second end wall and said first separating wall and coupled to said second separating wall and said second side wall, said VHF section excluding an inductor therefor being defined by said first, second and third separating walls and said second side wall, said PLL section being defined by said second end wall, said second and third separating walls and said second side wall;
- and
- at least first and second subdivision walls approximately parallel to said first separating wall and said second end wall and coupled to said first side wall and said second separating wall,
- said UHF section excluding an inductor therefor being defined by said first side wall, said first and second separating walls and said first subdivision wall,
- said inductor for said UHF local oscillator being disposed in an area defined by said first side wall, said first and second subdivision walls and said second separating wall,
- said inductor for said VHF local oscillator being disposed in an area defined by said first side wall, said second subdivision wall, said second separating wall and said second end wall.
A tuner unit having an antenna input filter section, an ultra-high frequency (UHF) section connected to said antenna input filter section, a very-high frequency (VHF) section connected to said antenna input filter section, and a phase-locked loop (PLL) section connected to said UHF section and said VHF section, comprising:
- first and second end walls approximately parallel to each other;
- first and second side walls approximately parallel to each other and coupled to said first and second end walls;
- a first separating wall approximately parallel to said first and second end walls and coupled to said first and second side walls, said antenna input filter section being defined by said first end wall, said first and second side walls and said first separating wall;
- and
- second and third separating walls for providing a first area for said UHF section and an inductor for a VHF local oscillator, a second area for said VHF section excluding said inductor therefor, and a third area for said PLL section, said second separating wall being coupled to said first separating wall and said second end wall, said third separating wall being coupled to said second separating wall and said second side wall,
- said first area being subdivided by at least two subdivision walls coupled to said first side wall and said second separating wall into a first sub-area for said UHF section excluding an inductor for a UHF local oscillator, a second sub-area for said inductor for said UHF local oscillator, and a third sub-area for said inductor for said VHF local oscillator.
A tuner unit having an antenna input filter section, an ultra-high frequency (UHF) section connected to said antenna input filter section, a very-high frequency (VHF) section connected to said antenna input filter section, and a control section connected to said UHF section and said VHF local oscillator, comprising:
- first and second end walls approximately parallel to each other;
- first and second side walls approximately parallel to each other and coupled to said first and second end walls;
- a first separating wall approximately parallel to said first and second end walls and coupled to said first and second side walls, said antenna input filter section being defined by said first end wall, said first and second side walls and said first separating wall;
- a second separating wall approximately parallel to said first and second side walls and coupled to said first separating wall and said second end wall;
- a third separating wall approximately parallel to said second end wall and said first separating wall and coupled to said second separating wall and said second side wall, said VHF section excluding an inductor for a VHF local oscillator being defined by said first, second and third separating walls and said second side wall, said control section being defined by said second end wall, said second and third separating walls and said second side wall;
- and
- at least first and second subdivision walls approximately parallel to said first separating wall and said second end wall and coupled to said first side wall and said second separating wall,
- said UHF section excluding an inductor for a UHF local oscillator being defined by said first side wall, said first and second separating wall and said first subdivision wall,
- said inductor for said UHF local oscillator being disposed in an area defined by said first side wall, said first and second subdivision walls and said second separating wall,
- said inductor for said VHF local oscillator being disposed in an area defined by said first side wall, said second subdivision wall, said second separating wall and said second end wall.
Dependencies are inferred from the claim text.