Questions tagged [waveguide]
A waveguide is a physical structure that guides electromagnetic or sound waves. They are most commonly employed at high frequencies such as microwave.
102 questions
0 votes
1 answer
144 views
Missing term in telegrapher's equations
I frequently see the lumped circuit model of the telegrapher's equations but want to see how this is derived from Maxwell's equations. I start out by assuming a parallel plate waveguide (extending in ...
- 109
1 vote
1 answer
111 views
What's the (seemingly) sinusoidal indentation on a microwave's oven waveguide?
This waveguide has a (my guess) sinusoidal indentation on the face opposite the magnetron's output. It seems to be roughly half a wavelenth in diameter as measured on the surface of the waveguide.
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3 votes
1 answer
249 views
RF trace at 4 layer PCB with over-the-metal chip antenna
I'm designing a PCB with 2.4GHz chip antenna and hope RF engineers can give me some clarification with RF design. My PCB has 0201 size components and this highly constrains what RF trace I can use. ...
- 31
1 vote
1 answer
93 views
Can coaxial cables be passed through waveguides without compromising below-cutoff effects?
I have a waveguide (a hollow copper tube) in the wall of my shielded chamber and now I want to know if I can feed coaxial cables with heavy shielding (like CAT 7) through the waveguide or if this ...
- 11
2 votes
2 answers
261 views
What is it? Waveguide part- gold plated?
Ok- new to waveguide parts- I acquired a few of these in a box. Appears to be gold plate on brass and copper- any help? I have been all over the internet
- 29
1 vote
2 answers
217 views
Reflection coefficient formula
Formula reference: https://en.wikipedia.org/wiki/Reflection_coefficient Reflection coefficient is as above. I would like to know what does it mean physically and how did we ended up to this conclusion?...
- 327
0 votes
0 answers
82 views
Transmision and coupling coefficient in waveguide and ring resonator
A simple ring resonator with a bus waveguide is described by: \begin{equation} \begin{pmatrix} B \\ C \end{pmatrix} = \begin{pmatrix} t & \kappa \\ -\kappa^* & t^* \end{pmatrix} \begin{pmatrix}...
- 155
1 vote
0 answers
366 views
coplanar waveguide impedance calculation and tolerance
The Ublox Sara R5 System Integration Guide I am following states that a 50 Ohm antenna waveguide design is recommended and provides a couple example designs that achieve this using FR4 dielectric. ...
- 517
1 vote
2 answers
230 views
Identifying monopole antenna with ground connected coil
I can’t find any information on what this design of antenna is called, it has a monopole wire connected to the signal pin of an SMA connector, the coil is connected to ground. The larger diameter ...
- 23
1 vote
1 answer
86 views
From the perspective of a progressive wave, what is lumped impedance? [closed]
This question asks about the meaning of lumped impedance in traveling wave theory. Should lumped impedance be viewed as something like a point charge, a point mass, or a direct delta function? When a ...
- 63
1 vote
2 answers
205 views
Conformal Mapping in Electrostatics: t-plane
In the paper 'Extension of the application of conformal mapping techniques to coplanar lines with finite dimensions' the author uses the t-plane as a intermediate step for calculating the capacitance ...
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2 votes
0 answers
74 views
Interruption in waveguides
I want to fabricate a PE waveguide.I deposited a layer of aluminum with a thickness of 180 nm on Lithium niobate.I lithographed the design of the waveguide,After developing photoresist and etching the ...
- 29
12 votes
1 answer
1k views
Which stackup to choose for JLPCB FR4 up to ~10GHz
I am aware that 10GHz on FR4 is not ideal, but this is an hobby project and I can tolerate some losses. The 10GHz on the PCB is minimal (probably only a short coplanar waveguide or microstrip with 2 ...
- 231
1 vote
0 answers
37 views
Phase velocity non-TEM transmission line
Assuming that a transmission line operates in a TEM or quasi-TEM mode, the phase velocity can be determined from the line parameters (R,L,C,G per meter assuming the RLCG model of a transmission line). ...
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6 votes
3 answers
4k views
Unexpected low characteristic impedance using the JLCPCB impedance calculator
I'm currently designing a PCB that is intended to fan out the 38 pins of a MICTOR connector to every other conductor of an 80-conductor ribbon cable (The PATA type one, that is AWG30 wires with a 0....
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