Connectors and transitions
Coaxial connectors
1) Typology of logon mechanical:
to) attack to screw
b) attack to bayonet
2) Typology of connectors:
to) sessuati
b) ermafroditi
3) ermafrodita Connector:
It is a connector whose contacts can be involved are like males who like females, in truth they are like the contacts female, ci² that it changes is that ruotando a metal ring exits outside a thread and the connector becomes female, ruotando in opposite sense the thread vien less and we have a male.
4) Typology of distinguished connectors for frequency:
to) BNC
b) APC7 is ermafrodita, the male is the N type
c) SMA until to 18 GHz, of exists also type smaller SSMA, is the connector in used absolute more
d) HP 3.5mm until to a maximum di 26,5 GHz
and) K until little over i 27 GHz
f) HP 2.4mm until to a maximum di 50 GHz
g) V until little over i 50 GHz
h) HP 1mm until to a maximum of 110 GHz
i) W until little over i 100 GHz
Transitions
5) Transition from microstrip to coaxial cable:
Launcher is said, he is come true with a coaxial cable whose external metal ring comes connected to the plan of mass while they centers comes flattened and connected to the advanced metalization of the microstriscia.Vengono considered acceptable losses until to 0.3dB in how much the field from the dielectric of the coaxial cable must be moved in the substrate and you they could also be of the losses in air.
6) Transition from coaxial cable to guide:
In a guide the field is maximum to the center of the side along therefore makes a hole in the long side and us the coming from connector from the coaxial cable knits, it centers them sporge as one small antenna and excites the way YOU1,0 from the opposite side to which the propagation interests us places a metallic stopper so that the field comes reflected in constructive way. This realization has the disadvantage not to be axial, in order to obviate, the connector from the propagation side can also be mounted and then to withdraw centers them.
7) Transition from waveguide to microstrip:
Two various realizations are possible:
to) they are come true of the scalini that they shrink the field in a more and more small region sin when not the iniettano in the substrate of the microstrip, this configuration has the disadvantage not to be watertight and the advantage of being axial
b) the waveguide finishes on a piece of the microstrip lacking in the mass metalization, it acts as from stopper and over it has a metalization that acts as from antenna to patch.
8) Transition from coaxial to coplanare:
A coaxial cable is had whose external stocking comes subdivided in two and tapered so as to to form the two trecce that, with to they centers, goes to form probe to coplanare which supports on three pad that they finish the structure coplanare, these are at a distance between they of approximately 100mm and therefore the probe necessity of mollette and tilt to the aim avoiding one excessive pressure on one of the three endings.
In the applications a work is used station equipped of an aspiring support that it maintains the wafer firm and to glide down in the course of the measure, wanting to carry out more measures on a same one wafer prefers to move same rather than the coplanari probes.