Compact multimode-resonator multiplexer with wide upper-stopband and high isolation

2020 ◽  
pp. 1-8
Author(s):  
Kaijun Song ◽  
Mou Luo ◽  
Cuilin Zhong ◽  
Yuxuan Chen ◽  
Yedi Zhou ◽  
...  
Keyword(s):  
Equivalent Circuits ◽  
Matching Network ◽  
Total Size ◽  
High Isolation ◽  
The Common ◽  
Stepped Impedance Resonator

Abstract A miniaturized high-isolation quadplexer with wide upper-stopband based on open and short stub-loaded multimode-resonator is proposed in this paper. Based on the theory of multimode-resonator and stepped impedance resonator (SIR), the compact quadplexer is designed by using multimode-resonator and SIR. In order to further miniaturize the size of the circuit, the multimode resonator is employed as the common resonator to replace the common matching network of the quadplexer and the SIRs are curved. Equivalent topology circuit is given to analyze and design the quadplexer. Detailed analyses are given according to the equivalent circuits. The proposed compact quadplexer working at central frequencies of 1.8, 2.4, 2.8, and 3.5 GHz with over 40 dB isolation is finally simulated, fabricated, and measured. The measured results agree well with the simulated ones. The total size of the fabricated quadplexer is 0.36 λg × 0.42 λg.

A novel balanced-to-balanced power divider based on three-line coupled structure

2019 ◽  
Vol 11 (2) ◽  
pp. 139-142
Author(s):  
Zhen Tan ◽  
Qing-Yuan Lu ◽  
Jian-Xin Chen
Keyword(s):  
Equivalent Circuit ◽  
Design Procedure ◽  
Power Divider ◽  
Equivalent Circuits ◽  
Differential Mode ◽  
Detailed Design ◽  
Symmetrical Structure ◽  
The Common ◽  
First Time ◽  
Good Agreement

AbstractThis paper presents a novel balanced-to-balanced power divider (PD) based on a simple and compact three-line coupled structure for the first time. By bisecting the proposed symmetrical structure, the differential mode (DM) and the common mode (CM) equivalent circuits can be obtained for analysis. The DM equivalent circuit exhibits a three-line in-phase power dividing response, and then a resistor is added between the two outputs for achieving good isolation. Meanwhile, the CM equivalent circuit shows a three-line all-stop response so that the CM suppression in this design does not need to be considered. Accordingly, the detailed design procedure of the DM PD is given. For demonstration, a prototype centered at 1.95 GHz is designed, fabricated, and measured. The simulated and measured results with good agreement are presented, showing low DM loss and wideband CM suppression.

High-isolation diplexer based on dual-mode substrate integrated waveguide resonator

2019 ◽  
Vol 12 (4) ◽  
pp. 288-292
Author(s):  
Kaijun Song ◽  
Mou Luo ◽  
Cuilin Zhong ◽  
Yuxuan Chen
Keyword(s):  
Fourth Order ◽  
Equivalent Circuits ◽  
Substrate Integrated Waveguide ◽  
Waveguide Resonator ◽  
Dual Mode ◽  
Third Order ◽  
High Isolation ◽  
Operating Modes ◽  
Mode Resonator

AbstractA high-isolation diplexer based on a dual-mode substrate integrated waveguide (SIW) resonator is proposed in this paper. Based on the theory of the dual-mode resonator, the miniaturized diplexers are designed by using the SIW dual-mode resonators. The superior isolation of the diplexers is obtained because the two operating modes of the dual-mode SIW resonators are not directly coupled and there is no interference with each other. In order to further improve the isolation of the circuit, the number of the order of the diplexer is added. Equivalent circuits are given to analyze and design the dual-mode high-isolation diplexers. Detailed analyses are given according to the equivalent circuits. The dual-mode third-order and fourth-order diplexers are designed and fabricated. The measured results agree well with the simulated ones. The total sizes of the fabricated third-order and fourth-order diplexers are 1.78λg × 2.64λg and 1.79λg × 3.63λg, respectively.

scholarly journals Design of Compact and High-Isolation Quadruplexer With Novel Matching Network

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 11374-11380 ◽  
Author(s):  
Qiang Shao ◽  
Fu-Chang Chen
Keyword(s):  
Matching Network ◽  
High Isolation

scholarly journals The genome analysis of Tripterygium wilfordii reveals TwCYP712K1 and TwCYP712K2 responsible for oxidation of friedelin in celastrol biosynthesis pathway

2020 ◽  
Author(s):  
Tianlin Pei ◽  
Mengxiao Yan ◽  
Yu Kong ◽  
Jie Liu ◽  
Mengying Cui ◽  
...  
Keyword(s):  
Tripterygium Wilfordii ◽  
Illumina Hiseq ◽  
Total Size ◽  
Oxidosqualene Cyclase ◽  
Pentacyclic Triterpenoid ◽  
Sequencing Strategy ◽  
Tumor Immunosuppression ◽  
The Common

ABSTRACTTripterygium wilfordii is a Traditional Chinese Medicine (TCM) from family Celastraceae and celastrol is one of the strongest active ingredients belonging to friedelane-type pentacyclic triterpenoid, which has a large clinical application value of anti-tumor, immunosuppression, and obesity treatment. The first committed biosynthesis step of celastrol is the cyclization of 2, 3-oxidosqualene to friedelin, catalyzed by the oxidosqualene cyclase, while the rest of this pathway is still unclear. In this study, we reported a reference genome assembly of T. wilfordii with high-quality annotation by using a hybrid sequencing strategy (Nanopore, Bionano, Illumina HiSeq, and Pacbio), which obtained a 340.12 Mb total size and contig N50 reached 3.09 Mb. In addition, we successfully anchored 91.02% sequences into 23 pseudochromosomes using Hi-C technology and the super-scaffold N50 reached 13.03 Mb. Based on integration genome, transcriptom and metabolite analyses, as well as in vivo and in vitro enzyme assays, two CYP450 genes, TwCYP712K1 and TwCYP712K2 have been proven for C-29 position oxidation of friedelin to produce polpunonic acid, which clarifies the second biosynthesis step of celastrol. Syntenic analysis revealed that TwCYP712K1 and TwCYP712K2 derived from the common ancestor. These results have provided insight into illustrating pathways for both celastrol and other bioactive compounds found in this plant.

scholarly journals Miniaturized High-Isolation Dual-Frequency Orthogonally Polarized Patch Antenna Using Compact Electromagnetic Bandgap Filters

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chunxia Cheng ◽  
Fushun Zhang ◽  
Yangtao Wan ◽  
Fan Zhang
Keyword(s):  
Patch Antenna ◽  
Dual Frequency ◽  
Radiation Patterns ◽  
Electromagnetic Bandgap ◽  
Total Size ◽  
Resonant Frequencies ◽  
High Isolation ◽  
Microstrip Patch ◽  
Opposite Line ◽  
Microstrip Feed

A miniaturized dual-frequency dual-polarization microstrip patch antenna with high isolation between receiving and transmitting ports (operating at 2.1 GHz for receiving and at 2.5 GHz for transmitting) is presented in this paper. The proposed antenna consists of a modified rectangular radiating patch, two 50 Ω microstrip feed lines, and two EBG filters. Two coupling microstrip lines are employed to excite two orthogonal fundamental modes (TM10and TM01). The high isolation is achieved by embedding two novel EBG filters underneath two feed lines to reject the incoming signal from the opposite line. Multilayer configuration, miniaturized EBG filters, and modified rectangular radiation patch contribute to size reduction. The total size is 0.67λ × 0.67λ × 0.03λ , only quarter of the multilayer rectangular radiation patch antenna (1.33λ × 1.33λ × 0.03λ) using common EBG filters with the same performance. Measured results on the reflection coefficients, isolations, and gains for the two frequencies are provided, which agree well with the numerical simulations. Also, measured isolations and radiation patterns at both two resonant frequencies are compared with the antenna without filters. The results show that the proposed method improves isolation by more than 20 dB with little influence on the radiation patterns.

Compact dual-band bandpass filter using open stub-loaded stepped impedance resonator with cross-slots

2016 ◽  
Vol 9 (2) ◽  
pp. 269-274 ◽  
Author(s):  
Bukuru Denis ◽  
Kaijun Song ◽  
Fan Zhang
Keyword(s):  
Bandpass Filter ◽  
Design Concept ◽  
Dual Band ◽  
High Isolation ◽  
Transmission Zeros ◽  
Full Wave ◽  
Measurement Results ◽  
Stepped Impedance Resonator ◽  
Simulation Results ◽  
Good Agreement

A compact dual-band bandpass filter using stub-loaded stepped impedance resonator (SLSIR) with cross-slots is presented. The symmetric SLSIR is analyzed using even- and odd-mode techniques. Design equations are derived and they are used to guide the design of the circuits. Two passbands can be easily tuned by cross-slots and open stubs. Transmission zeros among each passbands are created, resulting in high isolation and frequency selectivity. An experimental circuit is fabricated and evaluated to validate the design concept. The fabricated filter is compact with 19.76 × 12.7 mm2. The measurement results are in good agreement with the full-wave simulation results.

Separately-designable diplexer with multiple transmission zeroes using common stub-loaded SIR

2020 ◽  
pp. 1-7 ◽  
Author(s):  
Yu-Jing Zhang ◽  
Jing Cai ◽  
Jian-Xin Chen
Keyword(s):  
Null Point ◽  
Input Port ◽  
Third Harmonic ◽  
The Common ◽  
Stepped Impedance Resonator ◽  
Multiple Transmission ◽  
Good Agreement

Abstract A separately-designable diplexer with multiple transmission zeroes (TZs) using common stub-loaded stepped impedance resonator (SIR) is proposed. The common stub-loaded SIR operating in third harmonic (f3) and fifth harmonic (f5) is used for designing the two diplexer channels. The stub is loaded at the voltage-null point of f3 of the SIR. It can separately control f5 but has no effect on f3 so that the two channels can be separately designed. Meanwhile, the input port is tap-connected to the common stub-loaded SIR, which necessarily produces a TZ between f3 and f5, existing in both channel filtering responses. By properly choosing coupling schemes of the two channels, more TZs are realized at the desired locations. Thanks to the generation of the multiple TZs, both passband selectivity and isolation between the two channels are improved significantly. For demonstration, a diplexer operating at 2.22 and 2.95 GHz is designed, fabricated, and measured. The simulated and measured results are presented, showing good agreement.

Appearance and development of the brazier-shaped pottery (걚形土器) excavated from ancient tomb in the Jinhan and Byeonhan Region

2018 ◽  
pp. 5-32
Author(s):  
Il Jung Kim
Keyword(s):  
Forward Direction ◽  
Spatial Change ◽  
Total Size ◽  
Shape Difference ◽  
Flow Of Time ◽  
The Common ◽  
Temporal And Spatial ◽  
The Difference

The brazier-shaped pottery(盧形土器) was mainly excavated from the wooden chamber tomb as one of the major types of the latter soft grayish pottery(後期瓦質土器) in Jin Byeon Han(弁辰韓) area. According to the latter soft grayish pottery study, the shape of brazier-shaped pottery in the Byeon Jin Han area, had changed with time. But the‘ Byeon Jin Han’is a collective expression of a group of small units, the latter period of the Byeon Jin Han was during when the integration between the groups began to actively proceed. It is also meaningful to look at the aspects between unit sites rather than all Yeongnam province as an entire analysis unit. In this article, it’s focused on examining the differences in patterns of brazier-shaped pottery between unit sites. As a result of the analysis of the pottery, the common attributes shared across the Byeon Jin Han area and the characteristic properties of the unit sites were derived. The common attributes are the size and height of the top part, the maximum circumferential position(胴最大部) and shape, the percentage of foot in total size of the pottery etc.. The common attribute had changed in the forward direction, it’s interpreted it as shared the recognition of brazier-shaped pottery in all the Byeon Jin Han area. Meanwhile, the detailed type differences by units, is interpreted it as the result of selecting specific attributes in the region. Therefore it seems the shape of brazier-shaped pottery in the Byeon Jin Han area that common and optional attributes are combined. It’s examined the process of selective combination of attributes through comparison between regions. Considering the common attributes of the brazier-shaped pottery and the a temporal and spatial change of unit site’s property, there were various types of the pottery from the beginning, it develops in the direction of increasing the quantity with the formation according to the flow of time. As the shape difference between unit ruins decreases in the same time, it became flat in the Gyeongju region, the top part of pottery were developed in the upright direction in the Busan·Gimhae region. It’s changed to be hardened, transformed pottery stand(器臺) with the difference between Gyeongju and Busan·Gimhae region.

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