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Spurious harmonic suppression in compact coupled-line bandpass filter with asymmetric perturbations
摘要： Present article exhibits the design of a third-order compact parallel-coupled line bandpass filter at 5.25 GHz having asymmetric perturbations to suppress the second harmonic. Initially, the effects of compactness on filter characteristics have been studied by synthesising the distributed filter network into its equivalent circuit model. The design has been initiated by computing the unit cell model, which leads to the first-order and third-order design instances with an improvement in compactness over the traditional parallel-coupled line filter. In contrary, compactness in the filter characteristics degrades the second harmonic level subject to enhanced imbalances among the odd- and even-mode velocities at the coupled lines. Subsequently, the improvement in the harmonic suppression of 53 dB and 58 dB has been achieved by incorporating different non-uniform perturbations to the outer and coupled edges of the compact filters. Accordingly, compactness of 58% and 71% have been obtained subject to the folded and in-line designs over the conventional layout.
关键词： harmonic suppression,compactness,Bandpass filter,parallel-coupled lines,perturbations
更新于2025-09-16 10:30:52
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COUPLED LINE RAT-RACE COUPLER WITH WIDE ADJUSTABLE POWER DIVIDING RATIO AND UNCROSSED INPUT/OUTPUT PORTS
摘要： A novel rat-race coupler with wide adjustable range of power-dividing ratio and uncrossed input/output ports is presented by using coupling adjustable trans-directional (TRD) coupled lines, parallel coupled lines and a 180? phase shifting line. Wide adjustable range of power-dividing ratios is accomplished by varying the coupling of the TRD coupled lines. Moreover, with the combination of the TRD coupled lines and parallel coupled lines, the input and output ports of the rat-race coupler are uncrossed. The structure of the proposed rat-race coupler is analyzed, and the design equations are derived. As an example to validate the feature of the proposed rat-race coupler, a prototype operating at 1.6 GHz is devised, fabricated and measured. The measured results show that the designed coupler has a wide adjustable range (?7 ～ 15 dB) of power dividing ratio with a controlled voltage range of 3.3 to 13.5 V.
关键词： rat-race coupler,parallel coupled lines,TRD coupled lines,uncrossed input/output ports,180? phase shifting line,adjustable power-dividing ratio
更新于2025-09-12 10:27:22
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[IEEE 2019 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) - Qingdao, China (2019.9.18-2019.9.20)] 2019 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) - Wideband Omnidirectional Filtering Antenna Based On Coupled-line Structure
摘要： A novel omnidirectional filtering antenna with great filtering characteristics is presented. Firstly, a wideband bandpass filter (BPF) with Butterworth functional response based on coupled-line structure is designed and numerically analyzed. Then, a disc type omnidirectional antenna is proposed. When they are integrated together by using co-design approach, the signals from BPF couple to the antenna, thus, the omnidirectional filtering antenna is realized. The proposed antenna can provide a good frequency selectivity and high stopband suppression performance.
关键词： Parallel coupled lines,Omnidirectional antenna,Filtering characteristics
更新于2025-09-11 14:15:04