Narrow-band, fixed-tuned, and tunable bandpass filters with zig-zag hairpin-comb resonators

2003 ◽  
Vol 51 (4) ◽  
pp. 1214-1219 ◽  
Author(s):  
G.L. Matthaei
Keyword(s):  
Narrow Band ◽  
Bandpass Filters

Narrow-band switched-capacitor bandpass filters

1982 ◽  
Vol 29 (8) ◽  
pp. 557-572 ◽  
Author(s):  
M. Ghaderi ◽  
J. Nossek ◽  
G. Temes
Keyword(s):  
Narrow Band ◽  
Bandpass Filters ◽  
Switched Capacitor

Compact Bandpass Filters Using Folded Quad-Mode Stub-Loaded Loop Resonators

2020 ◽  
Vol 35 (10) ◽  
pp. 1217-1221
Author(s):  
Chen Liang ◽  
Yun Liu ◽  
Fanbin Tai
Keyword(s):  
Bandpass Filter ◽  
Narrow Band ◽  
Bandpass Filters ◽  
Single Band ◽  
Dual Band ◽  
Resonant Frequencies ◽  
Input And Output ◽  
Mode Method ◽  
Medium Band ◽  
Equal Space

Folded quad-mode stub-loaded loop resonators (QMSLLRs) are proposed for realizing both bandpass and dual-band bandpass filters with compact dimensions. The QMSLLR is a folded square loop loaded with four short stubs, providing structure symmetry in both transversal and longitudinal directions. Determined by the lengths of the loaded stubs, the four resonant frequencies as analyzed with even-odd mode method can be either distributed in one passband with equal space, or in two passbands with a guard band in between, for realizing a single-band bandpass filter or a dual-band bandpass filter, respectively. For both the input and output couplings, two perpendicular feeding lines are parallel coupled to the QMSLLR at one corner. The measure results prove that the structure is suitable for the design of a medium band or even narrow band bandpass filters with compact dimensions.

scholarly journals Observations of the 3.3μm Emission feature in Planetary Nebulae

1983 ◽  
Vol 103 ◽  
pp. 513-513
Author(s):  
W.P.J. Martin
Keyword(s):  
Narrow Band ◽  
Planetary Nebulae ◽  
Bandpass Filters ◽  
Emission Feature ◽  
Low Resolution

Absolute fluxes of the 3.3μm features were measured for 12 planetary nebulae. Both narrow-band photometry and low resolution spectrophotometry were used. Photometry was performed with narrow bandpass filters centered at 3.28μm and 3.72μm(λ/Δλ = 14). Using a CVF spectrophotometer, the 3.1μm – 3.8μm spectra of four nebulae (IC 418, IC 2149, NGC 6543, NGC 6572) were obtained. The values of the fluxes measured with the two different methods agree well.

scholarly journals Miniaturized Microstrip Diplexer Based on FR4 Substrate for Wireless Communications

2021 ◽  
Author(s):  
Hussein Ali Hussein ◽  
Yaqeen Sabah Mezaal ◽  
Ban M. Alameri
Keyword(s):  
Wireless Communications ◽  
Group Delay ◽  
Narrow Band ◽  
Bandpass Filters ◽  
Substrate Material ◽  
Negative Group ◽  
Input Output ◽  
Scattering Parameter ◽  
Frequency Responses ◽  
Dual Channels

In this paper, the miniaturized microstrip diplexer has been designed for dual channels based on FR4 substrate material. It consists of two bandpass filters (BPFs) functioning under dissimilar frequency bands coupled with a unified junction. Every BPF has been created by a meandered line resonator, step impedance resonator, uniform impedance resonator, and input/output feed lines. The AWR electromagnetic simulator has been used for characterizing the frequency responses of the projected diplexer. Noble scattering parameter results with narrow band responses and negative group delay values are obtained for the proposed diplexer. The microstrip diplexer has an interesting band isolation between the two filters around 31 dB. The device has been successfully fabricated and verified with the simulations.

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