UHF 7-Element LPDA calculated by LPCAD34 with Shorting Stub for improved SWR and Gain curves. TAU=0.9, SIGMA = 0.17, Input Z = 75 ohms, and other entries (incl. all element radius=AWG14) by holl_ands. Max Width = 12.8-in, Boom Length = 20.4-inches plus 5-inch Shorting Stub (that can be folded FORWARD).
UHF Raw Gain = 9.0 to 7.5 dBi, Poor F/B & F/R Ratio and SWR Under 2.0 [Excellent].
Characteristic Impedance = 75-ohms. LPCAD34 could not calculate a solution for 300-ohms.
Although Gain and SWR are good, F/B & F/R Ratios need improvement. Alternative design dimensions should be investigated.
Date(s): 8 Dec 2011. Album by holl_ands. 1 - 13 of 13 Total. 3305 Visits.
enlarge 78KB, 1024x860 1 UHF 7-Element LPDA w Shorting Stub - LPCAD34 3D View
enlarge 201KB, 1152x676 2 UHF 7-Element LPDA w Shorting Stub - LPCAD34 Top View [1 big box = 2.5-inches]
enlarge 59KB, 1152x193 3 UHF 7-Element LPDA w Shorting Stub - LPCAD34 Front View [1 big box = 1.25-inches]
enlarge 148KB, 1152x584 4 UHF 7-Element LPDA w Shorting Stub - LPCAD34 UHF Raw Gain = 9.0 to 7.5 dBi
enlarge 185KB, 1152x584 5 UHF 7-Element LPDA w Shorting Stub - LPCAD34 UHF SWR (75-ohms) under 2.2
