Manual Phase Shifters
L
orch Microwave’s MP-Series, Manual Phase Shifters, are
mechanically variable devices offering a continuously vari-
able phase shift over a 0-90 or 0-180 degree range. These
devices use a lumped element quadrature hybrid along
with a pair of matched variable LC networks. The LC net-
works are tied to ports 2 and 3 of the quad hybrid (See
Figure 1) to form a “sliding” short. These elements, when
placed at the output ports of the hybrid, will reflect inci-
dent energy back into the hybrid. The reflected energy
then appears at port 4, the isolated port. As the LC ele-
ments are varied, the apparent distance (or electrical
length) of the sliding short, changes the phase angle of the
reflected signal.
The phase adjustment is via a 34 turn mechanically vari-
able capacitor. Phase shift verses number of turns is shown
in Figure 2.
FIGURE 1
SCHEMATIC
❚
10-1000 MHz Frequency Range
❚
10% Standard Bandwidth
❚
0-90°, 0-180° and 0-360°
Phase Shift Ranges
❚
Multi-Turn, Infinite Resolution
❚
Low Loss, High Phase Stability
❚
PC Mount and Connectorized
Applications
..............................
..............................
❚
Fine Grain Phase Control
❚
Path Equalization or Balance
.............................
Frequency
(MHz)
Bandwidth
Phase
Shift
INS
Loss (dB) VSWR
.............................
❚
Closed-Loop Tracking System
TYPICAL PERFORMANCE SPECIFICATIONS
10 - 500
20 - 500
10%
10%
90°
180°
1.3
1.8
1.6:1
1.6:1
Notes:
1) All units rated at 0.5 Watts Avg, 2 Watts Peak. The Peak/Average
power handling capacity applies for thru-line VSWR’s of
1.25:1 max.
1725 N. Salisbury Blvd. · PO Box 2828 · Salisbury, MD 21802
Ph. 800-780-2169, 410-860-5100 · Fax 410-860-1949
Web http://www.lorch.com · E-mail lorchsales@lorch.com
2
The units listed are designed to provide optimum performance over the
full 10% bandwidth. If the band of interest is narrower than listed, it
should be indicated when ordering (See “Creating a Part Number”).
Performance will be optimized over the band of interest and improved
performance may be offered at no extra cost.
Manual Phase Shifters
FIGURE 2
TYPICAL PHASE SHIFT VS. RELATIVE ROTATION
Part Number Description
MP
1
-
180
2
-
120
3
-
12
4
-
S
5
-
75
6
Phase Shift
1
2
3
4
Relative Rotation (turns)
FIGURE 3
TYPICAL INSERTION LOSS VS. RELATIVE ROTATION
MP
Series, Manual Phase Shifter
180
Phase Shift in Degrees
120
Center Frequency in MHz
12
S
75
Bandwidth in MHz
Package Style, S-SMA, P-PC Mount
Input Impedance, if other than 50 Ohms
5
6
Creating a Part Number
Lorch Microwave’s MP-Series, Manual Phase Shifters, have
descriptive part numbers indicating the important electrical
characteristics that define the unit. A list of typical perform-
ance specifications are given in the preceding section. For
specifications outside these operating parameters, please
contact the factory.
Relative Rotation (turns)
Insertion Loss
OUTLINE, PC MOUNT
OUTLINE, CONNECTORIZED
1725 N. Salisbury Blvd. · PO Box 2828 · Salisbury, MD 21802
Ph. 800-780-2169, 410-860-5100 · Fax 410-860-1949
Web http://www.lorch.com · E-mail lorchsales@lorch.com
3
