Questions tagged [impedance-matching]
Impedance matching is a process of making one impedance equal to another another.
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Why does my calculation for transmission line reflection and transmission at a load have infinite solutions?
Take a transmission line with some characteristic impedance and insert a load somewhere along the line. What are the transmitted and reflected signals, given an sinusoidal input. Physically this ...
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Matching circuit for piezo transducer
I am at the stage of designing a system that match impedance of the power output (half-bridge) to a piezo transducer operating at 1MHz (Max 60W of power). I calculated the piezo parameters from the ...
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Unusual chip antenna feed impedance matching
I'm designing a PCB with a RFANT3216120A1T ceramic SMD chip Bluetooth antenna.
The part is somewhat poorly documented and does not state the antenna impedance. The datasheet shows a test board with an ...
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LTC5599: why are these baseband inputs passed through 49.9 ohms and the capacitor + SPI
I'm designing a radar transceiver board using the LTC5599. In the datasheet for the part, there is a schematic that shows the circuit configuration for the evaluation board. Here is an image of the ...
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Maximizing magnitude of fields created by an antenna
I have a small loop antenna (\$C\$ = circumference<< \$\lambda\$ ). I am interested in the fields created by this loop at a distance \$D\$ along the z axis also small compared to \$\lambda\$.
I ...
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Do audio impedance mismatches cause reflection (ie, 8-Ohm output to 20kOhm input) ? Does it matter?
I understand that audio source⇒input impedance mismatches are normal, and this answer provides a good reason as to why. However, having worked with RF more than audio, mismatches cause reflection that ...
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Impedance matching T/R switch
I do drive a piezo as transceiver. My transmitter provides square burst around 10Vpp which is too big for simply switching through a diode by dc biasing. I found out that bridge rectifier structure ...
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USB Data communication issue on a panelized pcba hardware test platform
I need some help..
I developed a test platform for the hardware tests of an electronic board panelized in sets of 10. The boards are placed on the test platform in their panelized form. As shown in ...
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Calculating output impedance of amplifier to match to 50 Ω
Below is a schematic of an amplifier. The inductor used is a 1 μH inductor, emitter resistor is 2.2 kΩ. The bias resistors are both 200 kΩ. The capacitors are both 1 μF. I am planning to design a ...
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Antenna complex input impedance into real impedance
I'm trying to design a loop antenna and make it resonate around 100 MHz.
Using a standard 50 ohms port, the resonating frequency is not at 100 MHz. Since I cannot change the geometry, I'm going to ...
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S-parameters of a matching network
I have the following matching network designed for \$\omega=2\pi\cdot 1GHz\$ and I want to calculate \$S_{11}\$ and \$S_{21}\$. The normal definitions/calculation setup for S11 that I use are in the ...
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LTspice - auto-transformer impedance ratio
Can you please clarify what formula is used by LTspice to calculate the auto-transformer impedance transfer ratio for the equivalent circuits below?
Both circuits resonate on the same frequency. I ...
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Single stub matching of loop antenna at 4.2 GHz
I am trying to match a loop antenna using the single stub matching technique.
Operation frequency: 4.2 GHz
Vacuum wavelength: 7.2 cm
Cable:
Impedance: 50 Ω
Velocity factor: 0.66
The antenna impedance ...
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Impedance matching on VNA does not match calculation (with detail steps included)
I have a PCB with a pi-matching network, and I want to calculate the component values for the matching network.
I use LiteVNA and a WE-MCA Multilayer Chip Antenna for this project.
Here is the basic ...
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Matching network for complex source and load
I'm trying to match a complex source to a complex load with an LC network at 10 kHz only. For instance a 1626 + j2280 Ω source at 10 kHz to a 122k - j3.5*10^6 Ω load. Can someone provide or document ...
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