Abstract
A New Method for Designing Modified Compact Microstrip LPF with Sharp Roll-Off and Wide Stopband
Highlights
In recent decades, the communication systems, especially the microwave applications, benefited from the microstrip filters
It should be noted that the relative stopband bandwidth (RSB), normalized circuit size (NCS), roll off (ROF) and suppression factor (SF) parameters are commonly used for the lowpass filter (LPF) and are defined in article [3]
The proposed LPF is simulated with the Agilent ADS software
Summary
The communication systems, especially the microwave applications, benefited from the microstrip filters. In [10,11,12] by using stepped impedance resonators the LPFs are designed, and those have good RSB, their ROFs are very low. In another article [13], the LPF structure is composed of a defected rectangular-shaped resonator and a rectangular shape resonator as a suppressing cell, and amount of its RSB is high, its NCS is low, its ROF is not appropriate. In article [20], using a meandered semi-hairpin resonator which is combined with a suppressing unit, an LPF with wide stopband and small NCS is presented and the disadvantages of it are small ROF and complexity in filter design. In [21], another LPF with good ROF and RSB consisting of three cascaded resonators with different semi-circle patches and four suppressors employing radial stubs has been proposed. To show efficiency of the designed LPF, it was fabricated and measured
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