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October 2007 [Components] Planar Filter Provide High Image Rejection High-rejection filters are often useful in receivers and other systems where unwanted signal images must be removed without interfering with desired signals. By following a straightforward approach, it is possible to design planar filters for use at higher microwave frequencies. The technique relies on the positioning of transmission zeroes in order to selectively suppress the unwanted images. The approach also provides high suppression of spurious second-harmonic... April 2006 [Components] Microstrip Filters Provide High Harmonic Suppression Harmonic filters are invaluable for removing unwanted higher-order harmonic signals from microwave multipliers and mixers in receiver designs, among other applications. Although a variety of filter configurations have been developed to reduce the level of harmonic signals, the authors investigated two varieties of bandpass filter designed for good harmonic suppression. Parallel coupled line sections were employed in both filter approaches, with phase equalization of coupled resonators... |
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