Microstrip bandpass filter using degenerate modes of a novel meander loop resonator

1995 ◽  
Vol 5 (11) ◽  
pp. 371-372 ◽  
Author(s):  
J.S. Hong ◽  
M.J. Lancaster
Keyword(s):  
Bandpass Filter ◽  
Degenerate Modes

Compact dual-band balanced bandpass filter based on circular SIW cavity

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sheng Zhang ◽  
Chao Ji ◽  
Meng-Han Tong ◽  
Zhen-Jiang Xie ◽  
Cong Xu
Keyword(s):  
High Frequency ◽  
Bandpass Filter ◽  
Dual Band ◽  
Center Frequency ◽  
Differential Mode ◽  
Mode Suppression ◽  
Transmission Zeros ◽  
Balanced Structure ◽  
Degenerate Modes ◽  
Excellent Selectivity

Abstract A compact dual-band balanced bandpass filter with high frequency selectivity and adjustable passband based on the perturbed circular substrate integrated waveguide cavity is firstly proposed in this paper. Two pairs of metallic vias are located at 45°direction of cavities to separate a pair of degenerate modes (TM110 modes) to achieve the differential-mode (DM) dual-band response. Moreover, the perturbation vias can also be used to control the center frequency of the second DM passband while the first one still stays unaffected. The introduction of source-load coupling makes the filter exhibit excellent selectivity. And four controllable transmission zeros appear near two DM passbands. Finally, good common-mode suppression has been got owing to the proposed balanced structure. The measured results are in accordance with the simulated ones well.

scholarly journals A Miniaturized Dual-Mode Bandpass Filter Using Slot Spurline Technique

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Haiwen Liu ◽  
Jiuhuai Lei ◽  
Jing Wan ◽  
Yan Wang ◽  
Feng Yang ◽  
...  
Keyword(s):  
Elliptic Function ◽  
Bandpass Filter ◽  
Dual Mode ◽  
Wave Simulation ◽  
Full Wave ◽  
Filter Characteristic ◽  
Simulation Results ◽  
Degenerate Modes ◽  
Good Agreement

A miniaturized dual-mode bandpass filter (BPF) with elliptic function response using slot spurline is designed in this paper. The slot spurline can not only splits the degenerate modes but also determine the type of filter characteristic (Chebyshev or elliptic). To miniaturize the resonator, four sagittate stubs are proposed. For demonstration purpose, a BPF operating at 5.75 GHz for WLAN application was designed, fabricated, and measured. The measured results are in good agreement with the full-wave simulation results.

scholarly journals Hybrid Microstrip/Slotline Ultra-Wideband Bandpass Filter with a Controllable Notch Band

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Xuehui Guan ◽  
Ping Gui ◽  
Tao Xiong ◽  
Baoping Ren ◽  
Lei Zhu
Keyword(s):  
Patch Size ◽  
Bandpass Filter ◽  
Circuit Model ◽  
Ultra Wideband ◽  
Microstrip Resonator ◽  
Microstrip Lines ◽  
Notch Band ◽  
Degenerate Modes

An ultra-wideband (UWB) bandpass filter (BPF) with a controllable notch band is presented by using hybrid microstrip/slotline structure. Firstly, a slotline resonator with symmetrically loaded stubs is fed by two microstrip lines to produce a UWB bandpass filtering response. Secondly, a microstrip triangular loop resonator is externally loaded over the slotline, and a notch band is introduced in the UWB passband. The notch band is determined by the perimeter of the loop resonator. Thirdly, two patches are added as the perturbation element to the corners of the microstrip resonator to excite a pair of degenerate modes. Bandwidth of the notch band can be tuned by properly selecting the patch size. Circuit model for the microstrip resonator loaded slotline is given and studied. Finally, the filter is designed, simulated, and measured. Measured results have agreed well with the simulated ones, demonstrating that a UWB filter with a controllable notch band has been realized.

Develop Dual-Mode DGS Bandpass Filters Using High Quality Factor Aluminum Oxide Ceramic Substrates

2012 ◽  
Vol 512-515 ◽  
pp. 1115-1118
Author(s):  
Chien Min Cheng ◽  
Kai Huang Chen ◽  
Yuan Tai Hsieh ◽  
Fuh Cheng Jong ◽  
Shih Fang Chen
Keyword(s):  
Aluminum Oxide ◽  
Bandpass Filter ◽  
Ground Plane ◽  
Oxide Ceramic ◽  
Microwave Dielectric Ceramic ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Dual Mode ◽  
Microwave Dielectric ◽  
Degenerate Modes

Aluminum Oxide microwave dielectric ceramics exhibit good microwave dielectric characteristics and suitable be used in the microwave devices. In this letter, using screen-printing technique and Ag/Pd paste, a novel dual-mode 2.4 GHz microstrip bandpass filter with U-shaped defected ground structure is screen printed on the Aluminum Oxide (Al2O3, relative dielectric constant=9.8) microwave dielectric ceramic substrate. In addition, a pair of input/output microstrip lines are designed to be 50 Ω and coupled to a λ/4×λ/4 square loop resonator. And in the ground plane, a U-shaped defected ground structure is used toλ excite the degenerate modes, which can be considered as a perturbation element to control the odd-mode frequency and -3 dB bandwidth of the bandpass filter. Finally, the coupling effects between these degenerate modes are presented and detailed investigated.

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