Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Whoever has experience on design microstrip coupler?

Status
Not open for further replies.

Needbias

Advanced Member level 4
Full Member level 1
Joined
Mar 3, 2002
Messages
103
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
756
whoever has experience on design microstrip 90-degree hybrid(not use lange coupler) for bandwidth of 4:1 or larger,I just want to know how to realize it?thx.
 

Needbias

Advanced Member level 4
Full Member level 1
Joined
Mar 3, 2002
Messages
103
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
756
Hi,vividsoft
4:1 means the ratio of highest freq and
lowest freq in the whole band
 

odyseus

Advanced Member level 4
Full Member level 1
Joined
Dec 31, 1999
Messages
115
Helped
6
Reputation
12
Reaction score
4
Trophy points
1,298
Location
Cold & Wet Europe!
Activity points
1,216
You best and only bets are to use either

(1) Hybrid ring or rat-race or

(2) Branch line hybrid,

Both will give the required quadrature phase you are after and are normally used for balanced amp and mixers etc..
 

Mazz

Advanced Member level 2
Advanced Member level 2
Joined
Nov 3, 2001
Messages
674
Helped
131
Reputation
262
Reaction score
50
Trophy points
1,308
Activity points
5,463
Yeah odyseus
but with a branch line or a rat race you can achieve a 20% BW. The solution could be find in some articles with that structures modified. But this adds some difficulties in design. I think it is not a simple task.
Mazz
 

Needbias

Advanced Member level 4
Full Member level 1
Joined
Mar 3, 2002
Messages
103
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
756
I agree with Mazz's viewpoint.There has some article about how to make a 3-dB microstrip(not stripline) hybrid using modified ratrace
structure with one octove bandwidth but to realize it will have some difficulity.
 

T

test140265

Guest
Newbie level 1
You can use a double branch line hybrid, there are quite good books on the subject,
the bandwidth of the doubble branch line is greater than the 90 deg branch line hybrid so it should fit your needs, if you can not find litterature mail me and i will find it in a few days.

Regards
 

Needbias

Advanced Member level 4
Full Member level 1
Joined
Mar 3, 2002
Messages
103
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
756
Thx very much,plz mail to me.
 

b4bb4ge

Full Member level 2
Full Member level 2
Joined
Feb 28, 2008
Messages
128
Helped
30
Reputation
60
Reaction score
16
Trophy points
1,298
Location
Colorado, USA
Activity points
2,050
What info do you have on a double branch line coupler will that change the phase and can you get -3db out of both still?

Thanks
 

jallem

Advanced Member level 1
Advanced Member level 1
Joined
Jul 23, 2005
Messages
450
Helped
73
Reputation
146
Reaction score
10
Trophy points
1,298
Activity points
4,993
I have seen a fractal rat race coupler where
the bandwidth is increased.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top