Microstrip Line

Microstrip Line:
   It is a transmission line that is fabricated using Printed Circuit Board Technology.
   It is formed over a dielectric substrate that separate the conducting strip from ground plane.
   It convey the microwave frequency signal. Microwave components can be formed from micro-strip such
as antenna, filters, Power dividers and couplers etc. these exist as the pattern of materialization on the substrate.
Figures show that area A is the Conductor, area B is Air, area C is Dielectric separating conductor from Ground Plane D. 

Disadvantage:
1.  Microstrip Line has lower power handling capacity than wave guide.
2.  These are susceptible to cross talk as they are not enclosed like waveguide.

Strip Line

Strip Line:
     A pair of ground planes, sandwiching conductor to form a Strip Line. This form is much like coaxial cable. To form a strip line, circuitry is etched on a substrate that has grounding plane on the opposite site, then adhesively attached second substrate on the top to form second ground plane. Strip Line is most often a " soft-board" technology, but using low-temperature co-fired ceramics (LTCC).

Advantage:
1.  Isolation between adjacent traces is achieved to avoid interference.
2.  Can be designed for circuits using frequencies range 10Mhz - 1 Ghz.

Disadvantage:
1.  It is much harder and more expensive to fabricate than micro-strip line.
2.  For impedance like 50 OHM, the strip line width is much narrower because of second ground plane.