A compact, broadband three-way substrate integrated waveguide power divider with improved isolation

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Arun Kumar Gande ◽  
Souma Guha Mallick ◽  
Bijit Biswas ◽  
Sayan Chatterjee ◽  
Dipak Ranjan Poddar
Keyword(s):  
Return Loss ◽  
Power Divider ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
Coupling Region ◽  
Content Type ◽  
Power Dividers ◽  
Power Coupling ◽  
Input And Output ◽  
Input Matching

Purpose This paper aims to present a compact, broadband substrate integrated waveguide (SIW) three-way power divider with improved isolation based on six-port SIW coupler. Design/methodology/approach The power coupling among the three output ports occurs due to short openings in the narrow walls of the central SIW channel. Performance improvement in the isolation and return loss among ports is achieved using matching posts placed at the input and output ends of the coupling region. This enhances the coupling between TE10 and TE30 modes. The input matching ports enhance the return loss, whereas the isolation is alleviated by both the input and output matching posts. The bandwidth enhancement is achieved by optimizing the outer SIW channel widths. Findings The measured fractional bandwidth of 27.3% with over 15 dB of isolation and return loss is achieved. The coupling length is 1.55 λg at the centre frequency. The power divider achieves better than 15 dB isolation between non-adjacent output ports. The measured reflection and isolation coefficients are in close agreement with simulated results over 8.2 to 10.8 GHz. Practical implications Isolation between the adjacent and non-adjacent ports is an important parameter as the reflections from these ports will interfere with signals from other ports reducing the fractional bandwidth of the power divider and affecting the overall performance of the transmitters and receivers. Originality/value The authors present the enhancement of isolation between the output non-adjacent ports by optimizing the SIW channel width and matching post in the coupling region to reduce the reflected signals from non-adjacent ports entering into other ports. To the author’s knowledge, this is the only SIW three-way power divider paper showing non-adjacent port isolation among six-port couplers based three-way power dividers.

scholarly journals Novel Gysel Power Dividers with Negative Group Delay Characteristics

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Zihui Zhu ◽  
Zhongbao Wang ◽  
Jianhao Zhou ◽  
Te Shao ◽  
Shaojun Fang ◽  
...  
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Group Delay ◽  
Power Divider ◽  
Center Frequency ◽  
Negative Group ◽  
Power Dividers ◽  
Input Matching ◽  
Coupled Lines ◽  
Negative Group Delay

A novel Gysel power divider with negative group delay (NGD), good matching, and low insertion loss is proposed. Resistors connected with short-circuited coupled lines (RCSCL) are shunted at output ports of the Gysel power divider to obtain NGD characteristics, and another resistor is shunted at the input port to realize perfect input and output matching. To verify the proposed structure, an NGD Gysel power divider is designed and fabricated. At the center frequency of 1.0 GHz, the measured NGD times for different output ports are −1.94 ns and −1.97 ns, the input/output port return loss is greater than 38 dB, the insertion loss is less than 8.3 dB, and the isolation between output ports is higher than 41 dB. To enhance the NGD bandwidth, two RCSCL networks having slightly different center frequencies are connected in parallel, which provides wider bandwidth with good input matching characteristics.

Wideband isolation-improved substrate-integrated waveguide power dividers/combiners

2018 ◽  
Vol 10 (9) ◽  
pp. 1019-1027
Author(s):  
Yong Mao Huang ◽  
Haiyan Jin ◽  
Yuliang Zhou ◽  
Supeng Leng ◽  
Maurizio Bozzi
Keyword(s):  
Insertion Loss ◽  
The Other ◽  
Power Divider ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
Balance Performance ◽  
Power Dividers ◽  
Lumped Resistors ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a 3 dB H-plane substrate-integrated waveguide (SIW) power divider/combiner with improved isolation is reported. By adding two isolated ports into the Y-junction, it will perform like a multi-port coupler, so that the isolation between its dividing ports can be effectively improved as the newly-added ports are properly matched. To verify the availability and effectiveness of this concept, two prototypes, one is terminated by coaxial terminations and the other is loaded with lumped resistors, are developed. Their measured results are separately in good agreement with their corresponding simulations. Meanwhile, isolations better than 16 dB with fractional bandwidth (FBW) of 35 and 25% are achieved, respectively, as well as low phase and amplitude imbalances. Compared with some reported similar SIW power dividers, the proposed ones exhibit wider FBW with similar isolation, insertion loss, phase, and amplitude balance performance.

Wideband out-of-phase power dividers with improved isolation performance

2019 ◽  
Vol 11 (08) ◽  
pp. 761-764
Author(s):  
Kaijun Song ◽  
Fei Xia ◽  
Yuxuan Chen ◽  
Yu Zhu ◽  
Jiawei Li ◽  
...  
Keyword(s):  
Return Loss ◽  
Power Divider ◽  
Band Width ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Power Dividers ◽  
Marchand Balun ◽  
Isolation Performance

AbstractA compact wideband out-of-phase power divider (PD) with improved isolation performance is proposed. This divider is formed by connecting an additional stub for isolation to output ports of a traditional Marchand balun with a defected ground structure (DGS) been used. To verify the design, a prototype divider is fabricated and tested. The measured results validate the 53.86% band-width centered at 3.43 GHz with more than 15 dB return loss at all ports, more than 17 dB isolation, respectively.

scholarly journals Miniaturization of Broadband Wilkinson Power Dividers

2018 ◽  
Vol 10 (1) ◽  
pp. 241
Author(s):  
Nadera Najib ◽  
Kok Yeow You ◽  
Chia Yew Lee ◽  
Mohamad Ngasri Dimon ◽  
Nor Hisham Khamis
Keyword(s):  
Transmission Lines ◽  
Power Divider ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Power Dividers ◽  
The Third ◽  
Operating Frequency Range ◽  
Phase Balance ◽  
Line Design ◽  
Wilkinson Power Dividers

This paper proposed three modified Wilkinson power dividers in order to achieve a size reduction and a wide bandwidth. The first structure presented the power divider using compact folded step impedance transmission lines rather than the uniform microstrip line design for operating center frequency of 3 GHz. The second structure showed the power divider with delta-stub for 2.4 GHz. Finally, the third modified structure introduced the two-section Wilkinson power divider using series-delta stub for center frequency of 2.4 GHz as well. The study managed to get an overall dimension of 15 mm × 9.5 mm for the first proposed design achieving a reduction of 75.6 % and fractional bandwidth of 133 %. For the second proposed structure, the size was 15 mm × 15 mm with a reduction of 56 % and fractional bandwidth of 56 %.  While the third design size was 17 mm × 15 mm with a reduction of 63.6 % and the structure achieved a broadband bandwidth with fractional bandwidth of 220 %.  The proposed power dividers used RT/duroid 5880 substrate with a thickness of 0.38 mm. Simulation and measurement results indicated that the modified power dividers showed equal power division, good phase balance, high isolation between output ports, and good return loss better than -12 dB covering the operating frequency range<strong>.</strong>

scholarly journals Broad Band Equal-Length And Equal-Width Substrate Integrated Waveguide Four Channel Power Divider

2015 ◽  
Vol 37 ◽  
pp. 334
Author(s):  
Masoud Khoubroo Eslamloo ◽  
Pejman Mohammadi
Keyword(s):  
Return Loss ◽  
Propagation Constant ◽  
Broad Band ◽  
Equal Length ◽  
Power Divider ◽  
Substrate Integrated Waveguide ◽  
Transmission Coefficients ◽  
Measurement Results ◽  
Simulation Results ◽  
Good Agreement

In this letter a novel broad band substrate integrated waveguide (SIW) power divider is proposed. It consist of four output channels made by SIW with equal length and equal width. Design equations and process are given with mathematical analysis. The propagation constant of the output signals have been adjusted by utilize only four via in the middle of the output arms. As a result a novel equal output power divider, is obtained accordingly. The experimental results of a prototype at 10 GHz shows 3.1 GHz bandwidth in both simulation and measurement results. Return loss and transmission coefficients have good agreement with simulation results in considered band.

scholarly journals A Novel Analytical Design Technique for a Wideband Wilkinson Power Divider Using Dual-Band Topology

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6330
Author(s):  
Asif I. Omi ◽  
Rakibul Islam ◽  
Mohammad A. Maktoomi ◽  
Christine Zakzewski ◽  
Praveen Sekhar
Keyword(s):  
Transmission Lines ◽  
Return Loss ◽  
Power Divider ◽  
Dual Band ◽  
Design Technique ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Analytical Design ◽  
Resonance Frequencies ◽  
Wilkinson Power Divider

In this paper, a novel analytical design technique is presented to implement a coupled-line wideband Wilkinson power divider (WPD). The configuration of the WPD is comprised of three distinct coupled-line and three isolation resistors. A comprehensive theoretical analysis is conducted to arrive at a set of completely new and rigorous design equations utilizing the dual-band behavior of commensurate transmission lines. Further, the corresponding S-parameters equations are also derived, which determine the wideband capability of the proposed WPD. To validate the proposed design concept, a prototype working at the resonance frequencies of 0.9 GHz and 1.8 GHz is designed and fabricated using 60 mils thick Rogers’ RO4003C substrate. The measured result of the fabricated prototype exhibits an excellent input return loss > 16.4 dB, output return loss > 15 dB, insertion loss < 3.30 dB and a remarkable isolation > 22 dB within the band and with a 15 dB and 10 dB references provide a fractional bandwidth of 110% and 141%, respectively.

A new design strategy for bandwidth and efficiency enhancement in KA band CMOS power amplifier

Circuit World ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mohammad Sadegh Mirzajani Darestani ◽  
Mohammad Bagher Tavakoli ◽  
Parviz Amiri
Keyword(s):  
Power Amplifier ◽  
Design Strategy ◽  
Power Divider ◽  
Ka Band ◽  
Content Type ◽  
Power Dividers ◽  
Power Added Efficiency ◽  
Distributed Structure ◽  
Cascade Structure ◽  
Good Agreement

Purpose The purpose of this paper is to propose a new design strategy to enhance the bandwidth and efficiency of the power amplifier. Design/methodology/approach To realize the introduced design strategy, a power amplifier was designed using TSMC CMOS 0.18um technology for operating in the Ka-band, i.e. the frequency range of 26.5-40 GHz. To design the power amplifier, first, a power divider (PD) with a very wide bandwidth, i.e. 1-40 GHz, was designed to cover the whole Ka-band. The designed Doherty power amplifier consisted of two different amplification paths called main and auxiliary. To amplify the signal in each of the two pathways, a cascade distributed power amplifier was used. The main reason for combining the distributed structure and cascade structure was to increase the gain and linearity of the power amplifier. Findings Measurements results for designed power dividers are in good agreement with simulations results. The simulation results for the introduced structure of the power amplifier indicated that the gain of the proposed power amplifier at the frequency of 26-35 GHz was more than 30 dB. The diagram of return loss at the input and output of the power amplifier in the whole Ka-band was less than −8dB. The maximum power-added efficiency (PAE) of the designed power amplifier was 80%. The output P1dB of the introduced structure was 36 dB and the output power of the power amplifier was 36 dBm. Finally, the IP3 value of the power amplifier was about 17 dB. Originality/value The strategy presented in this paper is based on the usage of Doherty and distributed structures and a new wideband power divider to benefit from their advantages simultaneously.

scholarly journals Wideband Directional Coupler for Millimeter Wave Application based on Substrate Integrated Waveguide

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohammad Javad Tavakoli ◽  
Ali Reza Mallahzadeh
Keyword(s):  
Numerical Methods ◽  
Millimeter Wave ◽  
Directional Coupler ◽  
Return Loss ◽  
Wide Band ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
High Isolation ◽  
Microwave Applications ◽  
Hole Structure

Recently, Substrate Integrated Waveguide (SIW) techniques have been noticed for millimeter wave devices in microwave applications. In this paper, we are developing a wide band directional 3 dB coupler with a phase of 90̊ phase delay in the range of 30-40 GHz based on periodic vias and multi hole structure. For achieving this wide bandwidth multi-section coupler is designed based on the theoretical modeling and the simulation result is compared with HFSS and CST with  two different  numerical  methods show good performance with low insertion and return loss, broad operational bandwidth and high isolation. A fractional bandwidth is about 28.5 %.

scholarly journals Design of Ku-band power divider using Substrate Integrated Waveguide technique

2019 ◽  
Vol 8 (1) ◽  
pp. 172-179
Author(s):  
Tan Gan Siang ◽  
David Paul David Dass ◽  
Siti Zuraidah Ibrahim ◽  
Mohd Nazri A. Karim ◽  
Aliya A. Dewani
Keyword(s):  
Return Loss ◽  
Low Cost ◽  
Power Divider ◽  
Substrate Integrated Waveguide ◽  
Band Power ◽  
Measurement Results ◽  
Via Hole ◽  
Equal Power ◽  
Better Than ◽  
Ku Band

A Ku-band Substrate Integrated Waveguide power divider is proposed. In this work, the SIW power divider is designed with T-junction configuration. The SIW technique enables the power divider to have low insertion loss, low cost and features uniplanar circuit. An additional of metallic via hole is added in the center of the junction to improve the return loss performance of the Tjunction SIW power divider. The simulated input return losses at port 1 are better than 27 dB, and features equal power division of about -3.1 dB ±0.4 dB at both output ports across frequency range of 13.5-18 GHz. The SIW power divider is fabricated, and the measurement results show acceptable performances. Since there are some losses contributed by the SMA connector of the fabricated SIW power divider prototype, an additional SIW transmission line is simulated and fabricated to analyze the connector loss.

scholarly journals Optimization of UWB Array Antenna for Bio-Medical Applications Using Cuckoo Search Algorithm

2018 ◽  
Vol 7 (2.20) ◽  
pp. 367
Author(s):  
K Rajkamal ◽  
Govardhani. Immadi
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Return Loss ◽  
Search Algorithm ◽  
Cuckoo Search ◽  
Cuckoo Search Algorithm ◽  
Optimization Techniques ◽  
Power Divider ◽  
Microstrip Technology ◽  
Power Dividers

A four-element microstrip antenna array is designed in which the array is made using Wilkinson power dividers and four identical patch antenna elements. The elements of the designed array are perfectly developed to get a constant gain and have a compact size against the frequency. Using the microstrip technology equipment a prototype can be build to enhance the directivity, return loss and also its return loss and radiation pattern. The antenna array that is put forth here comprises of two major parts which are the array of the antennas and also its power network. In many of the important applications like biomedical, communication and also radio frequency applications the power divider plays a crucial role. Power dividers also function as the power networks of the array of antennas. An equal division power divider is generally required to synthesize the radiation pattern. Here a very new design for a power splitter having the same square sector of four ports and also its application is also presented. Techniques like insertion and also insertion fitting techniques were employed to adjust or alter the phase and amplitude of the signals that are exiting each branch of the power divider. The impedances of the branches are adjusted according to the required power ratio by using the pairing techniques. Electromagnetic Solvers which are based on MOM used in the design process. The parameters using which the power divider is made up of is the dielectric constant Er=4.3,loss tangent of 0.02 and height of 1.6mm.Along with the design of the ultra wide band antenna is also designed. Finally some of the optimization techniques such as the fly flight algorithm, cuckoo search algorithm, spring cuckoo algorithm for reducing mutual coupling and improving antenna parameters such as return loss, gain pattern, directivity and radiation. The experimental measurements are made using the network vector analyzer. A good agreement was found between the measurements and the results of the simulation.  

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