| 摘要 |
PURPOSE:To extend the frequency band width by forming cut windows for adjustment on a ground conductor, which is formed on the outside surface of a dielectric substrate, at the side positions of parts vertically facing the open ends of a resonance conductor. CONSTITUTION:Ground conductors 3 are formed on both outside surfaces of dielectric substrates 1 and 1', and plural band-shaped resonance conductors 2 acting as filters are arranged on both inside surfaces of dielectric substrates 1 and 1' with one ends as short circuit ends 2a connected to ground conductors 3 and with the other ends as open ends 2b unconnected to ground conductors 3. Patterns of respective resonance conductors 2 of dielectric substrates 1 and 1' have reflected image relations and are brought into face contact with each other in the superposition state. A cut window (x) to adjust frequency bands of various modes is formed in the ground conductor 3 on the lower face of the dielectric substrate 1 in side positions of the part vertically facing an open end 2b of a central resonance conductor 2. Cut windows (y) for frequency adjustment to raise the frequency are partially formed in the ground conductor 3 formed on the upper face of the dielectric substrate 1' in parts vertically facing open ends 2b of resonance conductors 2. |
