| Modified Compact Combline Filter Using Planar Parallel Coupled Structure with Extended Rejection Bandwidth |
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In-Ho Kang, Kai Wang, Shang MIng Li |
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| Abstract |
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Modified compact combline bandpass filters are proposed based on the miniaturized quarter-wave transmission line which is composed of the parallel coupled line and lumped capacitors. The electrical length of the parallel coupled line in a resonator, which determines the size of combline bandpass filters, is just 5°or 7°, resulting in a compact circuit area. The designed combline bandpass filter also has a wide upper stopband by suppressing the spurious passbands, not moving. Measured results of two fabricated filters centered at 400MHz show good agreement with the theoretical predications. |
| Key Words:
Miniaturization;combline filter;parallel coupled line |
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