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vfone's latest activity

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vfone replied to the thread I need help. The resonant frequency of the monopole antenna varies greatly from the theoretical result..

I don't think it's enough what you call it. A sensor or an antenna has to behave as such for the name it has. This is actually the...

Friday at 5:18 PM
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vfone replied to the thread I need help. The resonant frequency of the monopole antenna varies greatly from the theoretical result..

I am confused. Pictures in post #1 shows very clear that is about a "rubber ducky" helical antenna (the one that you submerge in a...

Thursday at 4:56 PM
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vfone replied to the thread Asking about RF amplification chips.

These LNAs are good for WiFi. Both have an internal bypass switch. If you don't need this switch you can use PMA2-63LN+

Wednesday at 4:05 PM
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vfone replied to the thread choke ring antenna question.

I think there is a confusion between Cross Linear Polarization and Circular Polarization, which are different concepts in the context of...

Mar 23, 2025
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vfone replied to the thread choke ring antenna question.

If you have two perpendicular dipoles (vertical and horizontal), the field vector turns a right-hand sense or a left-hand sense?

Mar 23, 2025
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vfone replied to the thread Microstip patch antenna (help).

I don't name it "normal" but slots placed on the patch antenna could increase the antenna bandwidth, change the resonant frequency...

Mar 21, 2025
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vfone replied to the thread Microstip patch antenna (help).

Generally the bandwidth of a normal patch antenna (rectangular or circular shape) is about 5%. This is about 175MHz at n78 frequencies...

Mar 21, 2025
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vfone replied to the thread I need help. The resonant frequency of the monopole antenna varies greatly from the theoretical result..

If you can change the resonant frequency of an antenna from 2400MHz to 268MHz (one decade), just placing it in the water, you will get a...

Mar 20, 2025
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vfone replied to the thread choke ring antenna question.

Two perpendicular dipoles do not give you circular polarization. Still get 3dB polarization loss, as it is between linear and circular...

Mar 19, 2025
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vfone replied to the thread Antenna Array feedind.

https://en.wikipedia.org/wiki/Quarter-wave_impedance_transformer

Mar 19, 2025
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vfone replied to the thread Difference in performance/behavior by loading location ?.

If you read carefully you will see that the original post does not mention the length of the cables, which had to be chosen somehow. And...

Mar 17, 2025
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vfone replied to the thread Difference in performance/behavior by loading location ?.

The impedance mismatches in coaxial cables, theoretically appears only if the coaxial cable is too long or is improperly terminated. In...

Mar 16, 2025
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vfone replied to the thread Difference in performance/behavior by loading location ?.

A simulation using a short 1m RG58 coax cable, shows that S21=-0.25dB and S11=-25dB. 50 ohms resistors placed either at the input or at...

Mar 16, 2025
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vfone replied to the thread How to calculate the capacitor value for wire antenna tuning in a TPMS?.

The capacitor will shift a bit the resonant frequency but will affect the efficiency of the monopole antenna. Definitely the antenna...

Mar 14, 2025
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vfone replied to the thread Is there a correlation between how bad the S22 is and how hard the antenna is to design?.

If the PA output impedance is 100 ohms and the load impedance is 20 ohms, you may need a matching network to do the matching between...

Mar 12, 2025

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