Compact semilumped elliptic-function low-pass filter using microstrip meander line

2007 ◽  
Vol 49 (7) ◽  
pp. 1777-1779 ◽  
Author(s):  
Ju Gab Lee ◽  
Wu Seong Lee ◽  
Jae Jong Ryu ◽  
Yeon Kwan Moon ◽  
Joong Ho Jang ◽  
...  
Keyword(s):  
Elliptic Function ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Meander Line

Planar compact elliptic-function low-pass filter using high-permittivity ceramics substrate

2006 ◽  
Vol 48 (7) ◽  
pp. 1393-1398 ◽  
Author(s):  
Yuan-Bin Chen ◽  
Cheng-Liang Huang ◽  
Ching-Wen Lo
Keyword(s):  
Elliptic Function ◽  
High Permittivity ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Investigations on Three-Pole Microstrip Low-Pass Filters Incorporated with DGS and Fractals for Selectivity Improvement

2021 ◽  
Author(s):  
Ch. Murali Krishna ◽  
Sudipta Das ◽  
Chaitali Koley ◽  
B. T. P. Madhav
Keyword(s):  
Wireless Lan ◽  
Simulation Models ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Frequency Structure Simulator ◽  
Compact Size ◽  
Low Pass ◽  
Low Pass Filters ◽  
Parameter Values ◽  
Meander Line

In this paper, an investigation on compact microstrip low-pass filters (MLPFs) with extremely perfect low-pass characteristics and improved out-band suppression has been carried out for the improvement of the selectivity parameter ([Formula: see text]). For this purpose, two different defected ground structures (DGSs) based on Moore fractals and Meander line have been designed and experimentally validated. The proposed third-order low-pass filter (LPF) configurations are designed and simulated using the High-Frequency Structure Simulator (HFSS). To validate the simulation models, the prototypes of the suggested low-pass filters are fabricated using Teflon (TM) substrate having a relative permittivity of 2.65 and a loss tangent of 0.001, and measured using the Vector Network Analyzer. The simulation and measurement results are in good agreement. The proposed filters occupy a compact size of [Formula: see text]. The selectivity parameter values for the proposed Moore fractals- and Meander line-modeled DGS-based LPFs are 425[Formula: see text]dB/GHz and 850[Formula: see text]dB/GHz, respectively. The proposed microstrip low-pass filters offer a significant improvement in the selectivity parameter, offering a maximum value of 850[Formula: see text]dB/GHz. The proposed filters exhibit a very high figure of merit (FOM), reporting 71,335 for Moore fractals-based LPF and 118,354 for the Meander line-based LPF. These proposed filters are suitable for advanced mobile phone services, [Formula: see text]-band radar, Global Positioning System, mobile, paging services, Wi-Fi, Bluetooth and wireless LAN.

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