| 摘要 |
<p>A radio frequency band-pass filter device (31), comprising
- a grounded frame structure (34),
- a dielectric substrate (32) suspended within the frame structure (34),
- and a microstrip conductor structure (1; 21; 33) located on top of the dielectric substrate (32),
wherein the microstrip conductor structure (1; 21; 33) comprises
- an input conductor part (2),
- a plurality of identical unit cell conductor parts (4a-4e),
- and an output conductor part (3), with these conductor parts (2, 4a-4e, 3) arranged in a straight line (L),
wherein the unit cell conductor parts (4a-4e) are asymmetric with respect to a mirror plane (M) perpendicular to the substrate (32) and running along the straight line (L) of conductor parts (2, 4a-4e, 3),
and wherein the unit-cell conductor parts (4a-4e) are separated by gaps (5a, 5b) of equal width. The invention provides an improved RF band-pass filter device which is less expensive in production, and allows the exploitation of a CRLH behaviour of the filter device.</p> |
