1 Directional couplers EMLAB 7 4 Waveguide directional
1 Directional couplers EMLAB
7. 4 Waveguide directional coupler 2 Waveguide two-hole coupler Isolated Input Coupled Through EMLAB
3 Figure 7. 4 (p. 313) Two commonly used symbols for directional couplers, and power flow conventions. EMLAB
Application : network analyzer 4 S-Parameter Test Set Source Transfer switch Directional coupler R B A Port 2 Port 1 Fwd DUT Rev EMLAB
Waveguide multi-hole coupler 5 EMLAB
7. 5 Quadrature hybrid coupler ① ④ 6 ② ③ EMLAB
7 Even-odd mode analysis ① ① ② ② ④ ④ ③ ③ Line of symmetry I=0 V=max ① ④ ② ③ Line of anti-symmetry I = max V=0 EMLAB
8 EMLAB
9 EMLAB
10 Even mode analysis ① ④ Line of symmetry I=0 V=max ② ③ ① ② ④ ③ Open circuited stubs EMLAB
11 ① ② EMLAB
12 Odd mode analysis Line of anti-symmetry I=max V=0 Short-circuited stubs GND via EMLAB
13 ① ② Total scattered voltage EMLAB
14 7. 6 Coupled line coupler Microstrip coupler Coaxial coupler EMLAB
Even-odd mode analysis 15 EMLAB
Even mode analysis 16 EMLAB
Odd mode analysis 17 EMLAB
Design of couple line coupler 19 Isolated Coupled EMLAB
Freq. response of couple line coupler 20 EMLAB
21 7. 8 180° hybrid coupler 180° phase difference Sum, difference EMLAB
7. 8 180° hybrid coupler 22 Figure 7. 44 (p. 354) Even- and odd-mode decomposition of the ring hybrid when port 1 is excited with a unit amplitude incident wave. (a) Even mode. (b) Odd mode. EMLAB
Even mode analysis 23 EMLAB
Odd mode analysis 24 EMLAB
25 Figure 7. 45 (p. 356) Even- and odd-mode decomposition of the ring hybrid when port 4 is excited with a unit amplitude incident wave. (a) Even mode. (b) Odd mode. EMLAB
Ring hybrid modulator 26 EMLAB
27 EMLAB
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