Ch2-69 Circular Crossed Loops Driven by FULL BAND 2-Port 90-deg Phase Shifter analyzed using 4nec2. (e.g. Low Loss Ch2-69 Quadrature Hybrid...if only such a device existed!!!!!) For the purpose of this analysis, Dimensions for the OMNI UVOX-2 were assumed, per info on their website: http://www.omnitenna.com
FYI: Innovative Products IPP-2247 90-degree Coupler covers 2-1000 MHz, 0.9 dB Insertion Loss but is too big to fit in UVOX-2, and likely costs more than several UVOX-2 Antennas: https://innovativepp.com/product/ipp-2247
Minicircuits PROTOTYPE SXPQ-ED14355-1 covers Ch2-18, which is 200 MHz short of what is needed: http://www.minicircuits.com/pdfs/SXPQ-ED14355-1_SPEC.pdf
====================================== In fol. analysis an IDEALIZED, PERFECT 2-Port 90-Degree Phase Shift Network feeds both Loops.
Azimuthal Pattern is TRUE OMNI from Ch2 thru Ch13, including FM Band.
In UHF Band, some Gain Loss is seen in the CLOVER-LEAF NULLs, which becomes deeper on the mid to upper Frequencies.
Loops Driven by FULL BAND 2-Port 90-deg Phase Shifter [need to subtract Insertion Loss]: MAX Gain for Horizontal and Right-Hand Circular Polarization (RHCP): Lo-VHF: -4.6 dBi, -4.0 dBc FM: -3.2 dBi, -4.0 dBc Hi-VHF: 0.2 dBi, -3.7 dBc UHF: -0.2 dBi, -2.9 dBc
25 Aug 201542 items3786 visitsAlbum by holl_ands
enlarge 91KB, 971x1024 1 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter 3D View
enlarge 292KB, 1024x886 2 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Front View [1 large square = 1.25 inches]
enlarge 275KB, 1024x886 3 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Top View [1 large square = 1.25 inches]
enlarge 294KB, 1024x886 4 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Side View [1 large square = 1.25 inches]
enlarge 36KB, 791x1024 5 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter 4nec2 File Includes Summary of Dimensions
enlarge 117KB, 1152x476 6 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 Total Raw Gain "Forward" (90-deg Azimuth)
enlarge 119KB, 1152x476 7 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 Total Raw Gain on "Diagonal" (45-deg Azimuth)
enlarge 117KB, 1152x476 8 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 Total Raw Gain to "Side" (0-deg Azimuth)
enlarge 119KB, 1152x476 9 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 Total Raw Gain on "Diagonal" (135-deg Azimuth) Note: SAME as 45-deg "Diagonal"
enlarge 210KB, 1024x747 10 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 SWR (300-ohms) is HIGH, esp. in VHF Band
enlarge 222KB, 1024x747 11 Ch2-69 Crossed Loops Driven by 90-Degree Phase Shifter Ch2-69 SWR (75-ohms) is WORSE
enlarge 316KB, 1024x1024 13 Ch2-69 Crossed Loops - 54 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band
enlarge 318KB, 1024x1024 14 Ch2-69 Crossed Loops - 66 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band
enlarge 315KB, 1024x1024 15 Ch2-69 Crossed Loops - 66 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band
enlarge 316KB, 1024x1024 16 Ch2-69 Crossed Loops - 88 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band
enlarge 307KB, 1024x1024 17 Ch2-69 Crossed Loops - 98 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band
enlarge 317KB, 1024x1024 18 Ch2-69 Crossed Loops - 108 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band
enlarge 308KB, 1024x1024 19 Ch2-69 Crossed Loops - 174 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is close to TRUE OMNI in Hi-VHF Band
enlarge 311KB, 1024x1024 20 Ch2-69 Crossed Loops - 198 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is close to TRUE OMNI in Hi-VHF Band
enlarge 312KB, 1024x1024 21 Ch2-69 Crossed Loops - 216 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is close to TRUE OMNI in Hi-VHF Band
enlarge 316KB, 1024x1024 22 Ch2-69 Crossed Loops - 470 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: QUASI-OMNI, some Horizontal Gain Loss on Diagonals
enlarge 316KB, 1024x1024 23 Ch2-69 Crossed Loops - 530 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: FOUR-LOBES, some Horizontal Gain Loss on Diagonals
enlarge 318KB, 1024x1024 24 Ch2-69 Crossed Loops - 590 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: FOUR-LOBES, deep Horizontal Gain Loss on Diagonals
enlarge 314KB, 1024x1024 25 Ch2-69 Crossed Loops - 650 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: FOUR-LOBES, deep Horizontal Gain Loss on Diagonals
enlarge 313KB, 1024x1024 26 Ch2-69 Crossed Loops - 698 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: FOUR-LOBES, deep Horizontal Gain Loss in NULLs
enlarge 323KB, 1024x1024 27 Ch2-69 Crossed Loops - 806 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern: QUASI-OMNI, some Horizontal Gain Loss in NULLs
enlarge 307KB, 1024x1024 28 Ch2-69 Crossed Loops - 54 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 306KB, 1024x1024 29 Ch2-69 Crossed Loops - 66 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 307KB, 1024x1024 30 Ch2-69 Crossed Loops - 78 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Lo-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 310KB, 1024x1024 31 Ch2-69 Crossed Loops - 88 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band for RHCP (Right-Hand Circular Polarization)
enlarge 312KB, 1024x1024 32 Ch2-69 Crossed Loops - 88 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band for RHCP (Right-Hand Circular Polarization)
enlarge 315KB, 1024x1024 33 Ch2-69 Crossed Loops - 88 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in FM Band for RHCP (Right-Hand Circular Polarization)
enlarge 328KB, 1024x1024 34 Ch2-69 Crossed Loops - 174 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Hi-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 331KB, 1024x1024 35 Ch2-69 Crossed Loops - 198 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Hi-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 336KB, 1024x1024 36 Ch2-69 Crossed Loops - 216 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is TRUE OMNI in Hi-VHF Band for RHCP (Right-Hand Circular Polarization)
enlarge 326KB, 1024x1024 37 Ch2-69 Crossed Loops - 470 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is QUASI-OMNI in Hi-VHF Band for RHCP with some Loss in the Nulls
enlarge 323KB, 1024x1024 38 Ch2-69 Crossed Loops - 530 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is CLOVER-LEAF in Hi-VHF Band for RHCP with moderate Loss in the Nulls
enlarge 320KB, 1024x1024 39 Ch2-69 Crossed Loops - 590 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is CLOVER-LEAF in Hi-VHF Band for RHCP with moderate Loss in the Nulls
enlarge 317KB, 1024x1024 40 Ch2-69 Crossed Loops - 650 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is CLOVER-LEAF in Hi-VHF Band for RHCP with moderate Loss in the Nulls
enlarge 324KB, 1024x1024 41 Ch2-69 Crossed Loops - 698 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is CLOVER-LEAF in Hi-VHF Band for RHCP with moderate Loss in the Nulls
enlarge 326KB, 1024x1024 42 Ch2-69 Crossed Loops - 806 MHz Driven by 90-Degree Phase Shifter Azimuthal Pattern is CLOVER-LEAF in Hi-VHF Band for RHCP with significant Loss in the Nulls
