All Questions
Tagged with dielectric rf
10
questions
1
vote
2
answers
679
views
Effective dielectric constant in multilayer PCB design
Top => copper
PP1 => RO4350B
L2 => copper
PP2 => FR4
L3 => copper
PP3 => 185HR
L4 => copper
This is my PCB stackup.
In the top layer, I have a 50 Ω controlled RF trace. The ...
- 11
0
votes
1
answer
137
views
Relays: What is High Contact Stability?
This TE RF relay datasheet shows the component coming in three varieties:
High Dielectric
High Contact Stability
High Current
So high-current is obvious (right?), and (correct me if I'm wrong) high ...
- 2,088
1
vote
2
answers
85
views
How to increase efficiency of antenna without moving antenna far from tree?
I have designed a monopole antenna at 868MHz frequency. Now I would like to attach that antenna to the tree (wood). But, due to Why does placing an antenna far from the wood increase the efficiency of ...
- 27
1
vote
1
answer
179
views
Why does placing an antenna far from the wood increase the efficiency of the antenna?
I designed a monopole antenna at 868MHz frequency. I placed wood as the surrounding material. I noticed that placing the antenna far from the wood increases the efficiency of the antenna. Can anyone ...
- 27
1
vote
1
answer
61
views
Decide coherent time and fade duration through empirical studies on the channel and relate them to channel modeling
I. Scenario:
TX floating in the lossy heterogeneous medium with undetermined positions within a limited region;
RX fixed in the air and closed to the boundary of air-lossy medium;
Frequency: 500 MHz
...
- 27
0
votes
1
answer
740
views
Phased array minimum size
I want to know two things,how big does the phased array needs to be to form proper beam and what is the smallest area the beam can be focused.I learned little bit about lasers and with focal lense,the ...
- 651
1
vote
1
answer
82
views
RF dielectric measurement of a sample
during non contact dielectric measurement of any sample using VNA and patch antennas,should the antenna dielectric be taken into consideration for calculations?
i want to use a ultra wide band patch ...
- 11
2
votes
1
answer
564
views
How can S11 component measurement circuit be made on a pcb?
I have a material whose dielectric properties need to be measured. I have done literature review on the physics & impedance based methods to determine the dielectric component.
It requires S11 ...
- 69
0
votes
1
answer
548
views
How to determine dielectric constant and loss tanget of a PCB board at a specific frequency?
I need to know dielectric constant (relative permittivity) and Tan loss of a FR4 board at 2.45 GHz.
The specification of the manufacturer is as it is below:
Dielectric Constant:
Test method (IPC-TM-...
- 3,305
0
votes
1
answer
456
views
Displacement current generation in dielectric and in vacuum? How is it different?
I understand how the displacement current work in dielectric such as in parallel plate capacitors but don't know how they would work in a vacuum where there is no dielectric present. Can someone ...
- 1,652