T-Junction Splitter - Simple Quarter-Wave Splitter - Engineering Assignment Help

Assignment Task:

Task:

Introduction
2.
T-Junction splitter
3.
Simple Quarter-wave splitter
4.
Wilkinson divider
5.
Rat race coupler/splitter
Week 4 activities 1. Introduction
In my lecture you just learnt how to design splitters using transmission line techniques. I introduced you to the following examples:
1.
T-Junction Splitter,
2.
Simple quarter-wave splitter,
3.
Wilkinson Divider and
4.
a rat race couplerNow it is time for you to see for yourself how these work using microstripline technology. Try the above splitter simulations, by replacing the transmission lines with MLINS, using appropriate width lines to replace required impedances of transmission lines used in my slides. Also note, 90 degrees is a quarter wavelength.

1. T-Junction splitter
Simulate a microstrip (MLIN) T-Junction 3dB splitter similar to one shown in slide jWHTESePw/edit#slideid.ge36ae8f59_1_99>, in a 50 Ohm system, to operate at 2 GHz. Use Er 3.38, h 0.8128 mm, t0.035mm, Tand0.0027, Rho0.7 (Copper). Workout W for impedances used in the circuit and length at 2 GHz which can be computed using Eeff value and relevant formula. What values did you get here? 1.
What value of W, did you get for the input port and the two output ports? What value of L did you get at 90 degrees (Hint:quarter of a wavelength)? Show working and values in the document here jPjp_pXw/edit?pli1>
.
2.
Next, simulate the circuit to check if the power delivered is indeed 3dB on both output ports.Show your circuit schematic as well as the graphs t= hat make you believe that the 3dB splitter is working as expected or otherwi= se and explain what you see in the document here
jPjp_pXw/edit?pli1>.
To simulate this circuit, draw a similar schematic to one shown in this slide
pG_jWHTESePw/edit#slideid.ge36ae8f59_1_99> but replace the TLIN with MLIN. Add & define MSUB too. Keep the ports at= 50 Ohms, MLIN at P1 will be 50 Ohms, at P2 and P3 will be 100 Ohms. Plot th= e graphs as shown in the next slide to test the working of this splitter. 1. Simple Quarter-wave splitterSimulate a microstrip (MLIN+MSUB instead of TLIN) 3dB simple quarter-wave splitter similar to one shown in slide jWHTESePw/edit#slideid.ge36ae8f59_1_134>, to operate at 2 GHz. Use Er 3.38, h 0.8128 mm, t0.035mm, Tand= 0.0027, Rho0.7 (Copper). Impedances of MLINs should be the same as shown in theslide.Record your circuit schematic and answers for the widths as well as Lengths= of ALL sections of the splitter in the document here p_pXw/edit?pli1>
.
What happened when you reduced the length of TL4 and TL5 in microstrop to 0. Show also the plots that you observed here
p_pXw/edit?pli1>
. 1. Wilkinson dividerSimulate a microstrip (MLIN instead of TLIN) 3dB Wilkinson splitter divider to one shown in slide
jWHTESePw/edit#slideid.ge36ae8f59_1_149>
, to operate at 2 GHz. Use Er 3.38, h 0.8128 mm, t0.035mm,
Tand0.0027, Rho0.7 (Copper). Impedances of MLINs should be the same = as shown in the slide.Record your circuit schematic and answers for the widths as well as Lengths= of ALL sections of the splitter in the document here p_pXw/edit?pli1>
.
Observe and record the impact of the shunt resistance between the two output ports. Show also the plots that you observed here p_pXw/edit?pli1>
. 1. Rat race coupler/splitterSimulate a microstrip (MLIN) 3dB simple quarter-wave splitter similar to one shown in slide
jWHTESePw/edit#slideid.ge36ae8f59_1_195>

(based on slide jWHTESePw/edit#slideid.ge36ae8f59_1_171>), to operate at 2 GHz. Use Er 3.38, h 0.8128 mm, t0.035mm, Tand= 0.0027, Rho0.7 (Copper). Impedances of MLINs should be the same as shown in the slide.Record your circuit schematic and answers for the widths as well as Lengths= of ALL sections as well as the radius of the ring for this splitter in the document here
p_pXw/edit?pli1>
.
Explain why this splitter is better than other splitters you have simulated so far? Show and explain also the plots that you observed herep_pXw/edit?pli1>
.
NOTE FOR RATRACE LAYOUT: The 2 short transmission lines with the same length as the T junctions are wide, as spacers should be used for a circle from the arcs and other elements. This coupler is also known as a ring coupler.
Here is an example ring coupler layout suitable for 1 GHz, change the radius to change frequency. Zoom in to see the names of the new elements used here. Find these in the elements library under the microstrip section (curves and bends, t sections etc).

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