question:about the coupler

[littlemmx]

how about the bandwidth & frequency character compare with Branch-line Coupler & Ring Coupler?

 

[flatulent]

both of these are very narrowband if you consider isolation (5%-10%)

If you want wideband behavior, use coupled line types.

 

[qiang]

if you want big bandwidth and small square
you can use lange coupler

 

[g86]

Ring coupler gives more bandwidth than two branch coupler. For barnch coupler the band width can be increased by adding number of branches.

:!: :idea: :?:

how about the bandwidth & frequency character compare with Branch-line Coupler & Ring Coupler?

 

[qiang]

IS ring coupler has so large bandwidth??

 

[ttosolee]

here is another idea so called "de Ronde strip-slot coupler paper."

F.C. de Ronde. "A New Class of Microstrip Directional Couplers." 1970 G-MTT International
Microwave Symposium Digst of Technical Papers 70. 1 (1970 [MWSYM]): 184-189.

By using Cohn's slotline in combination with a microstrip. simple 90 as well as 180 directional
couplers of any coupling value can be made. As examples an ultra flat 10 db coupler for 1 - 12
GHz, an octave wide (2 - 4 GHz) magic tee and an almost lumped proximity coupler for 2 - 8
GHz (all on alumina substrate) have been made.

 

[g86]

No it is not larger than the bandwidth of a Lange coupler.

:!: :idea: :?:

IS ring coupler has so large bandwidth??