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Type: Posts; User: volker@muehlhaus

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1. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

No, Brad ist correct: the magnitude of R and X are equal in his left testcase, and current is equal, so indeed there is 0.7V across each of the components. But these voltages have a 90° phase offset,...
2. ## Thread: very uneven power divider

by volker@muehlhaus
Replies
1
Views
145

### Closed: Re: very uneven power divider

What is the coupling ratio? Maybe it's easier to just use a resistive divider in parallel to the main line, if the coupling is that small. The resulting mismatch is small then.
3. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

Here is the mistake in interpretation of your voltage divider experiment:

You expect the output voltage to be half the total voltage, because R and X are equal.

But that's wrong. The voltage...
4. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

Are you new to the concept of complex impedance? In the original post, there is a proper specification of complex impedance (real part from 50 Ohm termination, imaginary part from capacitor) so I'm a...
5. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

No. Impedance is capacitor voltage divided by capacitor current, and then we get 77 Ohm from your experiment.

156091
6. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

chiques, my comment was for BradtheRad and his comment. He missed that you specified the proper complex value.
7. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

### [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

Why do you confuse people if you don't understand the Smith Chart, and how to read it?
The original question was clear: 50.04 -j77.16
8. ## Thread: Calculate Capacitance Value from Smith Chart

by volker@muehlhaus
Replies
23
Views
908

9. ## Thread: Microstrip to layout in ADS for power amplifier design

by volker@muehlhaus
Replies
14
Views
644

### Closed: Re: Microstrip to layout in ADS for power amplifier design

You're discussing the wrong workflow. He uses a complete device, and doesn't design his own chip.

- - - Updated - - -

Look up the footprint size in datasheet and arrange input & output...
10. ## Thread: Microstrip to layout in ADS for power amplifier design

by volker@muehlhaus
Replies
14
Views
644

### Closed: Re: Microstrip to layout in ADS for power amplifier design

It seems he relies on auto-generated layout (from schematic) and doesn't know how to place components or artwork in layout manually. So in that case, having the component footprint will help in...
11. ## Thread: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

by volker@muehlhaus
Replies
30
Views
2,088

### Closed: Re: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

The difficulty is that you need not only a directional coupler and detector, but also a signal source with constant carrier.

For testing VSWR of my 2.4GHz antenna designs, I use this instrument...
12. ## Thread: Microstrip to layout in ADS for power amplifier design

by volker@muehlhaus
Replies
14
Views
644

### Closed: Re: Microstrip to layout in ADS for power amplifier design

No, sorry. But it' not complicated, you can draw using the drawing function icons (polygon etc).
13. ## Thread: Microstrip to layout in ADS for power amplifier design

by volker@muehlhaus
Replies
14
Views
644

### Closed: Re: Microstrip to layout in ADS for power amplifier design

For many components, you also find complete libraries (designkits) with components predefined, which have electrical model and layout.

If you want to create that yourself, create a cell for each...
14. ## Thread: Microstrip to layout in ADS for power amplifier design

by volker@muehlhaus
Replies
14
Views
644

### Closed: Re: Microstrip to layout in ADS for power amplifier design

But for auto-generating the layout, the MGAP is indeed a possible placeholder for the SMD. It can be set to create a defined gap, so that auto-generated layout continues with the next elements...
15. ## Thread: Two patch antennas gain

by volker@muehlhaus
Replies
3
Views
360

### Closed: Re: Two patch antennas gain

Just calculate the resulting pattern from two simulataneous radiators at some offset. There is interference depending on direction, and different for different offsets. You will see the resulting...
16. ## Thread: Two patch antennas gain

by volker@muehlhaus
Replies
3
Views
360

### Closed: Re: Two patch antennas gain

Yes, because the combined pattern will create side lobes as distance increases.

I created a little testcase for you:
- 2.4 GHz patch antennas with 40mm edge length
- Spacing varied from 20mm to...
17. ## Thread: Microstrip line and ground on same layer

by volker@muehlhaus
Replies
14
Views
714

### Closed: Re: Microstrip line and ground on same layer

Why have you chosen substrate thickness in your example as 3mils? That's somewhat unusual. Likewise, 2mils gap is rather extreme.

With "normal" dimensions, the effect caused by side ground that I...
18. ## Thread: RFID Coil design and Simulation

by volker@muehlhaus
Replies
4
Views
224

### Closed: Re: RFID Coil design and Simulation

What I have seen for UHF RFID readers are patch antennas.

EM simulation is possible and useful, planar simulation with ADS Momentum is a good starting point.
A former collegue designed this...
19. ## Thread: RFID Coil design and Simulation

by volker@muehlhaus
Replies
4
Views
224

### Closed: Re: RFID Coil design and Simulation

What RFID frequency band? UHF?
20. ## Thread: Microstrip line and ground on same layer

by volker@muehlhaus
Replies
14
Views
714

### Closed: Re: Microstrip line and ground on same layer

In addition to what was posted above, you can check side ground distance here:
https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm
...

by volker@muehlhaus
Replies
6
Views
716

### Closed: Re: ADS Filter simulator

Yes, that was the antenna pattern where your tutorial used the old ADS2011, but now ADS has a completely new 3D viewer. Don't take...
22. ## Thread: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

by volker@muehlhaus
Replies
30
Views
2,088

### Closed: Re: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

I recently purchased some antennas from a design house who document some precision requirements. They say that dipole dimensions are very critical, and they have 0.02mm (!!!) repeatability for their...

by volker@muehlhaus
Replies
6
Views
716

### Closed: Re: ADS Filter simulator

I tried to reproduce in ADS2020.

I entered Fp1 and Fp2 first, then Fs1 and Fs2. This results in filter order 5, not 10 as shown in your case. Works fine, no problems.

by volker@muehlhaus
Replies
13
Views
842

### Closed: Re: Question about RF power meter

Maybe you start width designing an antenna for that bandwidth, then share your findings ;-)

by volker@muehlhaus
Replies
3
Views
331

### Closed: Re: Question about PC3.5mm and SMA connectors

http://na.support.keysight.com/pna/connectorcare/What_mates_with_what.htm
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