DocumentCode :
881860
Title :
The Re-Entrant Cross Section and Wide-Band 3-db Hybrid Couplers
Author :
Cohn, Seymour B.
Volume :
11
Issue :
4
fYear :
1963
fDate :
7/1/1963 12:00:00 AM
Firstpage :
254
Lastpage :
258
Abstract :
A new type of parallel-coupled TEM-mode cross section is described and named the re-entrant cross section. An analysis of the even- and odd-mode characteristic impedances of the re-entrant cross section shows it to have advantages in the case of tight coupling when compared to previously used parallel-strip cross sections. Close tolerances are easily held, and considerable misalignment is permissible. Two single-section 3-db couplers were tested with coupling curves very close to theoretical, and with good directivity. Then a three-section coupler having a re-entrant center section was designed for the 400- to 2000-Mc band, yielding a coupling variation less than 0.4 db and a minimum directivity of 29 db. Next a three-section coupler was designed for the 1- to 5-Gc band. A series of modifications resulted in a final model having a coupling variation within 0.5 db, and a minimum directivity of about 22 db.
Keywords :
Bandwidth; Coaxial components; Conductors; Couplings; Directional couplers; Impedance; Joining processes; Strips; Transmission lines; Wideband;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.1963.1125651
Filename :
1125651
Link To Document :
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