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Filters and Diplexers

Filters and Diplexers
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Filter Shape Factors Transfer Function Frequency Domain Characteristics Time Domain Characteristics Steep out of band rejection Phase and group delay characteristics degraded by steep selectivity Most apparent near band edge Very good, though not as steep roll-off as Elliptic Better performance than Elliptic but still degraded phase and group delay characteristics Most frequent choice Shallow amplitude roll-off to stopband Good phase and group delay characteristics Good choice when phase linearity is more important than rejection Poor rejection characteristics Excellent phase and group delay performance Good choice when phase, group delay and impulse response are important Gaussian - 6dB Transitional Filter Rejection begins increasing abruptly outside the passband (-6dB) Usually chosen when good time delay and rejection cannot be sacrificed Standard Catalog Response Attenuation more steep in transition to the reject band than a pure Gaussian response Provides best compromise between rejection, phase and group delay Generally more expensive to produce bringing technology to life 1725 North Salisbury Blvd. PO Box 2828 Salisbury, Maryland 21802 800.780.2169 · 410.860.5100 Fax 410.860.1949 lorchsales@lorch.com www.lorch.com

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Lorch Microwave offers a series of discrete lumped element filters and diplexers with standard “off the shelf” packaging utilizing the same internal components, circuit topologies and transfer functions found in Lorch filter products manufactured for military and space applications. Standard units are an ideal choice when hermetic sealed packages are not a requirement and when lower cost and quick delivery are essential. Diplexers These diplexers offer the same circuit topologies as the bandpass, lowpass and highpass models. Length is dependent on the number of sections in each channel...

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Filter Shape Factors 1725 North Salisbury Blvd. PO Box 2828 Salisbury, Maryland 21802 800.780.2169 ■ 410.860.5100 Fax 410.860.1949 lorchsales@lorch.com www.lorch.com

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