A compact ultra‐wideband bandpass filter with good selectivity based on interdigital coupled‐line

2018 ◽  
Vol 28 (9) ◽  
Author(s):  
Xinlin Xia ◽  
Fengjun Chen ◽  
Xu Cheng ◽  
Xianjin Deng
Keyword(s):  
Bandpass Filter ◽  
Ultra Wideband ◽  
Coupled Line

Parallel-coupled stub-loaded resonator bandpass filter with ultra-wideband passband on multilayer liquid crystal polymer substrates

2015 ◽  
Vol 8 (8) ◽  
pp. 1183-1186 ◽  
Author(s):  
S. Almorqi ◽  
H. Shaman ◽  
A. Alamoudi
Keyword(s):  
Liquid Crystal ◽  
Bandpass Filter ◽  
Liquid Crystal Polymer ◽  
Ultra Wideband ◽  
Center Frequency ◽  
Coupled Line ◽  
Crystal Polymer ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Chebyshev Filter

A multilayer bandpass filter with ultra-wideband passband is presented in this paper. The filter is designed to have a very wide passband with a fractional bandwidth of about 180% at a center frequency of 10.5 GHz. The filter consists of two sections of parallel-coupled lines loaded at the center with short-circuited stub. Each of the coupled line sections and short-circuited stubs is designed to be a quarter-wavelength long at the desired center frequency. As a result, the filter exhibited a selective filtering characteristic equivalent to a five-pole Chebyshev filter with a very low insertion loss. The proposed filter is realized and fabricated using multilayer liquid crystal polymer substrate. The design is successfully realized in theory and verified by full-wave electromagnetic simulation of the full layout and the experiment where excellent agreement is obtained.

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