UHF Circular & Square Loops NO Reflector


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UHF Circular & Square Loops NO Reflector

UHF Circular & Square Loops analyzed using 4nec2.

a) UHF Circular Loop - NO Reflector:
Ken Nist's Loopa.ez (7.5-in diameter, using AWG12) is a good choice for the Old UHF Band.
A better choice for the (470-698 MHz) UHF Band is 7.75-in diameter, using AWG12.
However, SWR is excessive at lowest and highest frequencies.

SWR can be significantly improved by using QICT (Quarter Inch Copper Tubing), with 8.5-in
Diameter being best size for UHF Band. Raw Gain is then 3.6-5.1 dBi, SWR under 2.7.

b) UHF Square Loop - NO Reflector
Optimum size for UHF Band is 6.9-in per side (x4).
Raw Gain is 3.4-4.1 dBi. SWR is under 2.7. Which is lower Gain than the Circular Loop above.

EDIT (6 Sep 2011): Added UHF Square Loop.

Date(s): 15 July 2009. Album by holl_ands. 1 - 37 of 37 Total. 12814 Visits.

enlarge 0KB, 1024x696 1 UHF Circular Loop - Compare for AWG12 Ken Nist's Loopa.ez (7.5-in) is good for Old UHF Band. Slightly larger (7.75-in) is best for New UHF Band. Click on image to see higher rez. Click on "X" as usual to exit Window.	enlarge 0KB, 1024x696 2 UHF Circular Loop - Compare for QICT QuarterInchCopperTubing significantly improves SWR. Best size is 8.5-in for New UHF Band.	enlarge 283KB, 1024x696 3 Twin-Hoop Chireix vs "Figure-8" Twin-Loop vs Shorted-Bowtie-Loop (SBL) vs 2-Bay Hentenna vs 6-Whisker Bowtie vs Single Loop. In decreasing UHF Gain order.
enlarge 0KB, 1024x819 4 UHF Circular Loop - Raw Gain 7.5-in Diameter using AWG12	enlarge 0KB, 1024x819 5 UHF Circular Loop - SWR 7.5-in Diameter using AWG12	enlarge 0KB, 1024x819 6 UHF Circular Loop - Impedance 7.5-in Diameter using AWG12
enlarge 0KB, 1024x819 7 UHF Circular Loop - Raw Gain 8.5-in Diameter using QICT	enlarge 0KB, 1024x819 8 UHF Circular Loop - SWR 8.5-in Diameter using QICT	enlarge 0KB, 1024x819 9 UHF Circular Loop - Impedance 8.5-in Diameter using QICT
enlarge 153KB, 1024x793 10 UHF Circular Loop - Total Gain at 550 MHz 7.5-in Diameter using AWG12	enlarge 149KB, 1024x791 11 UHF Circular Loop - Total Gain at 650 MHz 7.5-in Diameter using AWG12	enlarge 150KB, 1024x781 12 UHF Circular Loop - Total Gain at 800 MHz 7.5-in Diameter using AWG12
enlarge 0KB, 1024x819 13 UHF Circular Loop - Horizontal Gain at 550 MHz 7.5-in Diameter using AWG12	enlarge 0KB, 1024x819 14 UHF Circular Loop - Horizontal Gain at 650 MHz 7.5-in Diameter using AWG12	enlarge 0KB, 1024x819 15 UHF Circular Loop - Horizontal Gain at 800 MHz 7.5-in Diameter using AWG12
enlarge 0KB, 1024x819 16 UHF Circular Loop - Vertical Gain at 550 MHz 7.5-in Diameter using AWG12 Small OVERHEAD Gain at low Freqs.	enlarge 0KB, 1024x819 17 UHF Circular Loop - Vertical Gain at 650 MHz 7.5-in Diameter using AWG12 OVERHEAD Gain getting smaller.	enlarge 0KB, 1024x819 18 UHF Circular Loop - Vertical Gain at 800 MHz 7.5-in Diameter using AWG12 Moderate Gain towards the SIDES. But well outside the new UHF Band.
enlarge 308KB, 1024x1024 19 UHF Circular Loop - Elevation Gain at 470 MHz 7.5-in Diameter using AWG12	enlarge 310KB, 1024x1024 20 UHF Circular Loop - Elevation Gain at 650 MHz 7.5-in Diameter using AWG12	enlarge 320KB, 1024x1024 21 UHF Circular Loop - Elevation Gain at 806 MHz 7.5-in Diameter using AWG12
enlarge 153KB, 1024x690 22 UHF Circular Loop 7.5-in Diameter using AWG12 Hi-VHF Raw Gain = 0.0 to -1.0 dBi	enlarge 184KB, 1024x690 23 UHF Circular Loop 7.5-in Diameter using AWG12 Hi-VHF SWR (300-ohms) = 265 to 140 is Excessive	enlarge 220KB, 1024x690 24 UHF Circular Loop 7.5-in Diameter using AWG12 Hi-VHF Impedance
enlarge 44KB, 869x1024 25 UHF Square Loop - 6.9-in Per Side, QICT 3D View	enlarge 187KB, 1024x908 26 UHF Square Loop - 6.9-in Per Side, QICT Front View [1 small box = 0.25-in] [1 big box = 1.25-in]	enlarge 26KB, 791x1024 27 UHF Square Loop - 6.9-in Per Side, QICT 4nec2 File
enlarge 146KB, 1152x638 28 UHF Square Loop - 6.9-in Per Side, QICT UHF Raw Gain	enlarge 194KB, 1152x638 29 UHF Square Loop - 6.9-in Per Side, QICT UHF SWR (300-ohms) under 2.7	enlarge 161KB, 1152x638 30 UHF Square Loop - 6.9-in Per Side, QICT UHF Impedance
enlarge 336KB, 1024x1024 31 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 470 MHz: Total, Horizontal & Vertical.	enlarge 342KB, 1024x1024 32 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 590 MHz: Total, Horizontal & Vertical.	enlarge 346KB, 1024x1024 33 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 698 MHz: Total, Horizontal & Vertical.
enlarge 344KB, 1024x1024 34 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 758 MHz: Total, Horizontal & Vertical. Gain is mostly Vertical, towards sides.	enlarge 340KB, 1024x1024 35 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 792 MHz: Total, Horizontal & Vertical. Gain is mostly Vertical, towards sides.	enlarge 355KB, 1024x1024 36 UHF Square Loop - 6.9-in Per Side, QICT Azimuthal Pattern at 806 MHz: Total, Horizontal & Vertical. Gain is mostly Vertical, towards sides.
enlarge 25KB, 791x1024 37 Example 4nec2 File UHF Circular Loop - 8.5-in QICT

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holl_ands,

Have you done any UHF circular modeling with a screen reflector yet?

What spacing would one use for a 506-698 MHz range?
- Systems2000, Thu, 15 Oct 2009 11:54AM