scholarly journals Design of Capacitively Loaded Coupled-Line Bandpass Filters With Compact Size and Spurious Suppression

2017 ◽  
Vol 65 (4) ◽  
pp. 1235-1248 ◽  
Author(s):  
Marco Orellana ◽  
Jordi Selga ◽  
Paris Velez ◽  
Marc Sans ◽  
Ana Rodriguez ◽  
...  
Keyword(s):  
Bandpass Filters ◽  
Coupled Line ◽  
Compact Size ◽  
Spurious Suppression

Spurious Suppression Effect by Transmit Bandpass Filters with HTS Dual-Mode Resonators for 5GHz Band

2009 ◽  
Vol E92-C (3) ◽  
pp. 288-295
Author(s):  
Kazunori YAMANAKA ◽  
Kazuaki KURIHARA ◽  
Akihiko AKASEGAWA ◽  
Masatoshi ISHII ◽  
Teru NAKANISHI
Keyword(s):  
Bandpass Filters ◽  
Dual Mode ◽  
Suppression Effect ◽  
Spurious Suppression

Miniaturized Wideband Bandpass Filter based on Capacitor-loaded One-eighth Wavelength Coupled Line

2021 ◽  
Vol 36 (7) ◽  
pp. 865-871
Author(s):  
Jin Shi ◽  
Jiancheng Dong ◽  
Kai Xu ◽  
Lingyan Zhang
Keyword(s):  
Insertion Loss ◽  
Simple Structure ◽  
Bandpass Filter ◽  
State Of The Art ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Transmission Zeros ◽  
Compact Size ◽  
Multiple Transmission

A novel miniaturized wideband bandpass filter (BPF) using capacitor-loaded microstrip coupled line is proposed. The capacitors are loaded in parallel and series to the coupled line, which makes the filter just require one one-eighth wavelength coupled line and achieve filtering response with multiple transmission poles (TPs) and transmission zeros (TZs). Compared with the state-of-the-art microstrip wideband BPFs, the proposed filter has the advantages of compact size and simple structure. A prototype centered at 1.47 GHz with the 3-dB fractional bandwidth of 86.5% is demonstrated, which exhibits the compact size of 0.003λ2 g (λg is the guided wavelength at the center frequency) and the minimum insertion loss of 0.37 dB.

scholarly journals Four-State Coupled-Line Resonator for Chipless RFID Tags Application

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 581 ◽  
Author(s):  
Wazie M. Abdulkawi ◽  
Abdel-Fattah A. Sheta
Keyword(s):  
Dielectric Constant ◽  
Radio Frequency Identification ◽  
Rfid Tags ◽  
Microstrip Resonator ◽  
Coupled Line ◽  
Chipless Rfid ◽  
Compact Size ◽  
Frequency Identification ◽  
The Cost ◽  
Good Agreement

A novel quad-state coupled-line microstrip resonator is proposed for compact chipless radio frequency identification (RFID) tags. The proposed resonator can be reconfigured to present one of four possible states: 00, 01, 10, and 11, representing, no resonance, resonance at f2, resonance at f1, and resonance at both f1 and f2, respectively. The frequency span between f2 and f1 can be easily controlled, thereby reducing the required spectrum. Moreover, the proposed technique allows the storage of a large amount of data in a compact size to reduce the cost per bit. A multi-resonator prototype consisting of six resonators is designed, analyzed, and experimentally characterized. This prototype is implemented on the RT Duroid 5880 substrate with a dielectric constant of 2.2, loss tangent of 0.0009, and thickness of 0.79 mm. The designed configuration can be reconfigured for 46 codes. Two complete the RFID tags, including the six resonators and two orthogonally polarized transmitting and receiving antennas, are implemented and tested. The first tag code is designed for all ones, 111111111111, and the second tag is designed as 101010101010 code. Experimental results show good agreement with the simulation.

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