A wideband coplanar stripline to microstrip transition. The planar folded dipole can be constructed using printed circuit technology, its input impedance can be adjusted over a wide range of values, and it has significantly greater bandwidth. To characterize this transition in the lower frequency band, a simple equivalentcircuit model that consists of uniform. The coplanar waveguide cpwto coplanar stripline cps transition is analyzed theoretically and experimentally in this paper. Microstrip, stripline, coplanar waveguide guide page 1.
If the spacing between the line edge and the adjacent ground plane is more than about 0. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Chapter 5 analysis and modeling of coplanar waveguide. But the choice of transmissionline technology, such as microstrip or grounded coplanar waveguide gcpw circuitry, can also influence the final performance expected from a design. Comparison of embedded coplanar waveguide and stipline. Calculate microwave impedance with transmissionline. When the sparameter or equivalent circuit model created by hfss. However i am not getting proper e field distribution the field is scattered throughout the substrate. Conventional cps does not provide bottom metallization of the substrate for ground.
Simulation using the high frequency simulator software hfss shows that a bandwidth of ghz with less than 25. Much has been written about terminating pcb traces in their characteristic impedance, to avoid signal reflections. Microstrip and covered microstrip stripline 4 slotline coplanar waveguide. Microstrip line design in hfss part1 use captions. Stripline basics stripline types directional coupler. Correct usage restricted to lie coplanar to a dielectric face, or extend through only one. Ultrawideband coplanar waveguidetoasymmetric coplanar stripline transition from dc to 165 ghz yunfeng dong1, tom k.
The stripline is a transverse electromagnetic tem transmission line. I have to design and model coplanar waveguide in a gsg form for millimeter wave vco. Stripline suspended stripline slotline coplanar waveguide finline q factor 250 100 to 150 400 500 100 150 500 radiaton low high low low medium medium none dispersion low none none high low low chip mounting difficult for shunt, easy for series poor fair easy for shunt, difficult for series easy for series and shunt fair impedance range 20 to. Microstrip line basics microstrip line types stripline. Figure 3a shows the hfss model of a given cps structure. Design considerations and tradeoffs for microstrip, coplanar and stripline structures at millimeterwave frequencies elementary transmission line theory, general theory waves microwave and millimeterwave engineers frequently refer to waves and their properties plane wave. A wideband coplanar stripline cpstomicrostrip line was developed. By understanding the stripline transmission line, designers can properly build these structures to meet their needs. The mwi2010 microwave impedance calculator is a transmission line modeling tool for electronics engineers. A twodimensional eigenvalue problem is solved first to find the waveguide modes of this port. As shown in fig1, it looks like a sandwidth structure. Comparing microstrip and grounded coplanar waveguide. Modeling approximation can be used to design the microstrip trace.
It covers microstrip line, stripline,suspended stripline,slotline, coplanar waveguide,finline along with figures. Tools options hfss options general tab check use wizards for data input when creating new boundaries check duplicate boundariesmesh operations with geometry click ok. How is coplanar stripline fed in hfss i am using hfss for simulating patch antennas without ground planes. Analysis must include first three modes te10, te20, te01 3. A variant of coplanar waveguide is formed when a ground plane is provided on the opposite side of the dielectric, which is called finite groundplane coplanar waveguide fgcpw, or more simply, grounded coplanar waveguide gcpw. For the love of physics walter lewin may 16, 2011 duration. For a single line, four modes were set for cpw and for stripline for a 4mil length of. This is a rectangular slot microstrippatch antenna design tutorial using hfss software. Microstrip line vs coplanar waveguidedifference between. The slits are formed periodically on the side of each of. This article describes stripline basics and mention stripline types viz. A good guideline to determine when the transmission line approach is necessary for logic signals. The symmetric stripline is a reliable method for creating a transmission line. Dear all, at the risk of annoying some of you here for posting, most probably, trivial questions on the hfss simulation i am trying to carry out.
To obtain the field patterns, intrinsic impedance and. Stripline directional coupler is also described below. It shows the electric and magnetic vector fields at. The advantages of coplanar waveguide are that active devices can be mounted on top of the circuit, like on microstrip. It provides link to types and basics of coaxial and transmission lines. Johansen and vitaliy zhurbenko this paper presents an ultrawideband coplanar waveguide cpw to asymmetric coplanar stripline acps transition. Rectangular waveguide hfss r objective getting started with hfss a tutorial using hfss, simulate an airfilled wr90 waveguide shown above. Practically this antenna will be fed by a coax, center pin of coax connected to center strip of the antenna and ground strips. This article describes microstrip line basics and mention types of microstrip lines and their advantages. The cpw is uniplanar in construction and it facilitates easy shunt, as well. Stripline is considered as extended version of microstrip line. Tzonglin wu department of electrical engineering national taiwan university prof.
I encounter a problem for opening it because i am using hfss v. Asymmetric coplanar stripline transition from dc to 165 ghz yunfeng dong, tom k. The coplanar waveguide cpw is commonly used in microwave circuits. Design considerations and tradeoffs for microstrip.
The cps is used for the design of filters, antennas, mixers and. Coplanar waveguide cpw fed bowtie antenna using the ansoft hfss design. The useful links to difference between various terms are provided here. To obtain the field patterns, intrinsic impedance and wavelength for the first 4 modes. Comsol multiphysics, with the rf module, makes it easy to compute the impedance, fields, losses, and other operating parameters needed when designing a cpw. We investigate the feasibility of coplanar striplines. This tool calculates key parameters for most common microwave transmission lines, including microstrip, stripline, and coplanar waveguide transmission lines. The proposed transitions are very compact and can provide the combined functions of transition and filter. Symmetric stripline impedance tool eeweb community. For example, quasitem field solver and fullwave field solver. A simple microstrip transmission line is design here. The corrugated structure is formed at least on one side of the strip conductors, including a plurality of slits.
The parameters evaluated were gain, beamwidth and return loss. This page on microstrip line versus coplanar waveguidecpw provide difference between microstrip line and coplanar waveguidecpw. Due to the fields within two guidedwave media, the microstripdoes not support a pure tem wave. This is an animation from a simulation of a coplanar waveguide cpw done in ansys high frequency structural solver hfss. A center strip with two adjacent ground strips together constitutes feeding end of the antenna structure. This laboratory experiment provides a handson tutorial for drafting up an electromagnetic structure a stripline transmission line on a circuit board in the ansys. Pdf analysis of coplanar waveguidetocoplanar stripline. The transition has a simple structure for the ease of fabrication with low cost.
Hfss microstrip antenna design stripline feeding youtube. The hfss is used to simulate the circulator and to check the nonreciprocal characteristics at operating frequency. Compared with microstrips and coplanar waveguides, the ssls dense air. Stripline has one or more interior strip conductors immersed in a dielectric with ground planes above and below. Wu microstriplines microstrip structure inhomogeneous structure. Chen department of industrial engineering and managenment. A new design of a coplanar waveguide cpw to microstrip transition is presented. Chapter 6 analysis and modeling of coplanar strip line. Im trying to calculate the resonance frequency of a cpw resonator as well as the qfactor of the.
The cps is a balanced transmission line and makes more efficient use of the wafer area than cpw. Coplanar stripline resonators modeling and applications to filters article in ieee transactions on microwave theory and techniques 505. Chapter 6 analysis and modeling of coplanar strip line 6. Comparison of embedded coplanar waveguide and stipline for multilayer boards mohanad abulghasim, justin tabatchnick, and milica markovic. Infraredfrequency coplanar striplines unc charlotte pages. Coplanar stripline resonators modeling and applications to. Many designers may be familiar with the stark differences between highfrequency microstrip and stripline. Miniature triangular circulator with coplanar waveguide. Ultrawideband coplanar waveguide to asymmetric coplanar. Us6686808b1 coplanar stripline with corrugated structure. Stripline transmission lines microwave circuits that supports tem or quasitem modes are. Analysis of coplanar waveguideto coplanar stripline transitions article pdf available in ieee transactions on microwave theory and techniques mtt481.
Coplanar stripline cps is a balanced uniplanar transmission line, consisting of two metallic conductor strips separated by a certain gap width, on a substrate. Wideband microstrip line to coplanar stripline cps transitions are proposed. Coplanar waveguide animation hfss this is an animation from a simulation of a. Johansen1 and vitaliy zhurbenko1 1electromagnetic systems group, department of electrical engineering, technical universityof denmark, oersteds plads building 348, 2800 kgs. Using hfss, simulate an airfilled wr90 waveguide shown above. However, it may not be clear when transmission line techniques are appropriate. A coplanar stripline is provided, including a dielectric substrate, and first and second strip conductors, which are each formed on the dielectric substrate, parallel to each other and separated by a predetermined distance. The transition consists of a multisection matching transformer and a quarterwavelength radial stub for the impedance matching and field matching between the microstrip line and cps, respectively. The lowpass coplanar waveguideto coplanar stripline transitions are proposed, using planar lumpedelements to realize the filter prototypes in the transition structures. When the longitudinal components of the fields for the dominant mode of a microstrip.
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