adapters
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3. Straight Adapters

a) Straight Adapter Jack/Jack

 

wpe74.jpg (3384 bytes)

 A brand-new, shiny, nickel-plated jack/jack adapter.

Conclusion: Can be used up to 18 GHz for non-critical applications. Not recommended at 24 GHz.

 wpe2F.jpg (67916 bytes)

 

 b) Straight Feed-Through Panel Adapter Jack/Jack

wpe75.jpg (3847 bytes)

  

A second-hand gold-plated adapter.

Conclusion: a very nice adapter, no real problem to use this type at 24 GHz.

 wpe31.jpg (71491 bytes)

 

c) Straight Adapter Plug/Plug

wpe76.jpg (3498 bytes)

  

A second-hand stainless steel plug/plug adapter

Conclusion: a nice adapter, no real problem to use this type at 24 GHz.

 wpe33.jpg (73161 bytes)

 

 

wpe77.jpg (3845 bytes)

  

 

 

A brand-new shiny nickel-plated plug/plug adapter. It is slightly longer than the previous one. Measurements on different samples show similar behaviour. Two representative measurements are shown in the plots.

Conclusion: It is better not to use this type of adapter.

 wpe35.jpg (66888 bytes)
wpe36.jpg (74587 bytes)

 

  d) Straight Adapter Plug/Jack

wpe26.jpg (3522 bytes) Second-hand gold-plated adapter.

Conclusion: a very nice adapter; no problem to use this type at 24 GHz. The plot also shows a resonance at a frequency above 25 GHz.

 wpe79.jpg (71452 bytes)

 

4. L-Adapters

a) L-Adapter Jack/Jack

wpe27.jpg (3851 bytes) Second-hand gold-plated adapter.

Conclusion: reasonable behaviour for a right angle adapter!

 wpe7A.jpg (76720 bytes)

 

 

b) L-Adapter Plug/Jack

 

Note: the scale of the plots is different.

The next measurements show quite big differences in behaviour between the measured plugs. Detailed photographs of some of the adapters show the small differences.

wpe78.jpg (3311 bytes) Second-hand gold-plated adapter.

Conclusion: this is a reasonably nice one and can be used on 24 GHz when a right angle adapter is needed.

 wpe3B.jpg (80334 bytes)

 

wpe29.jpg (3381 bytes) Second-hand gold-plated part.

Conclusion: the look is only slightly different from the adapter above but the behaviour is quite different. This adapter cannot be used at 24 GHz!

wpe3C.jpg (83035 bytes)

 

wpe2A.jpg (3301 bytes) Second-hand gold-plated adapter.

 

Conclusion: a resonance just above 15 GHz.

wpe3D.jpg (83227 bytes)

 

wpe2C.jpg (3109 bytes) Second-hand gold-plated adapter.

 

Conclusion: a very nice part, no problem to use this type at 24 GHz.

 wpe3E.jpg (74608 bytes)

End conclusion for L-adapters: There is a big difference in behaviour of this type of adapter. A relation between the physical properties and the measurements could not be found, as we did not have enough material to check our conclusions. For frequencies up to 10 GHz these right angle adapters can be used without any problem. When using the adapters at 24 GHz it is recommended to buy different types and do your own tests.