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Antenna_e

 Homebrew Antenna used for Satellite and HF communication.

This page edited the article on a Japanese page by JE2TLZ. Contents

HF Full-sized whip antenna for cars

Vertical antenna for car. ANT photo

14MHz_SWR&Z 14MHz_WhipANT1.png

It's better to install an antenna in the center of the car.
Change by a location on the car. carvert21-.gif

It could be used by a connection directly, but an adjustment Transformer was made.
Unun32-50 photo、Circuit unun1625cir2.PNG、SWR&Z unun16-25kc2.png
A Transformer is put on the RIG side.

Rectangular loop ANT (21to28MHz)

Good antenna in a vertical surface.

Width 2.34m , height 5.12m , full length 14.25m of an element.
I produced the reduction effect of covering wire.

Adjusted by 21MHz is 1:1 balun. 24&28MHz by LC adjustment circuit. It's changed by the switch.
Impedance matching circuit→LoopANTmach.PNGMatching Box photo

The Large LC adjustment circuit was done small.
28MHz of SWR less than 2 was 700KHz.

HF Top Loading Verttical Dipole

Upper Element by 0.9m above from the coil at the time of 1.6m last from the coil.
The length of the Loading Coil is 106mm, and 96mm in the diameter.
Photograph of Hi-Q Loading Coil

Band Loading Coil Lower side element
14MHz 14Turn 4.535m
18MHz 8T(short 6T) 3.69m
21MHz 5T(short 9T) 3.20m
24.9MHz 3T(short 11T) 2.70m
28MHz no(short ALL) 2.20m

The frequency is switched by manual control.
The coil is short-circuited because of bottom toward the center.

I measured Verttical DP the miniVNA → VerticalDP14-21.png,VerticalDP25.png

Loop Antenna

146MHz 3ele Loop ANT Gain 10.0dbi SWR2> 3.4MHz(MMANA)
Element Spacing Loop Diameter Circumference Diameter
Re 390mm 681.2mm 2140mm 3.0mm
Ra -- 651.6 2047 3.0
De 450 627.7 1972 3.0

I measured 145MHz3eleLoop the miniVNA → 3ele_loop_2m2.png

435MHz 4ele Loop ANT Gain 11.9dbi SWR2> 8.7MHz(MMANA)
Element Spacing Loop Diameter Circumference Diameter
Re 148mm 232mm 730mm 3.0mm
Ra -- 218.0 685 3.0
D1 193.5 214 672 3.0
D2 195 211 664 3.0

This 4eleLoop changed to wide a little more 3eleLoop because vertical pattern was too narrow.

435MHz 3ele Loop ANT Gain 10.2dbi SWR2>10.6MHz(MMANA)
Element Spacing Loop Diameter Circumference Diameter
Re 127mm 232mm 728mm 3.0mm
Ra -- 218 685 3.0
D1 173 210 661 3.0

432MHz 5ele Loop ANT _ EME could be received.
Element Spacing Loop Diameter Circumference Diameter
Re 174mm 233mm 732mm 3.0mm
Ra -- 221 694 3.0
D1 196 213 669 3.0
D2 246 211 664 3.0
D3 242 210 661 3.0

The material is wood, a plastic stick, an aluminum line, and a pressure terminal.
All Loop ANT is Impedance matchings are only 1:1 Balun.(Bazooka Match)BazookaMatch.png

1269MHz 4ele Loop ANT Gain 11.7dbi (MMANA)
Element Spacing Loop Diameter Circumference Diameter
Re 41mm 79.2mm 248.9mm 1.2mm
Ra --- 77.6 234.8 1.2
D1 69 72.2 226.7 1.2
D2 76 70.3 221 1.2
The material is wood, an Brass line.

The Satellite QSO me with a portable transceiver with this small antenna.
(AO-51 L/U mode, Only 1W QRP!) Rig00640s.jpg

Yagi-Uda Antenna

145MHz 3ele Yagi-Uda ANT Gain 9.0dbi SWR2> 2.3MHz(MMANA) 270g
Element Spacing Length Height Diameter
Re 248.1mm 1010mm 6.0mm
Ra -hafeFD- 940.5 23mm 5.0
Di 558.2 895.5 5.0

I measured 145MHz3eleYagi the miniVNA → 3eleYagi_2m.png

435MHz 5ele Yagi-Uda ANT Gain 11.3dbi SWR2> 13.3MHz(MMANA) 220g
Element Spacing Length Height Diameter
Re 100mm 343.9mm 5.0mm
Ra -FD- 304.5 16.5mm 4.0
D1 132.3 314 5.0
D2 196.4 297 5.0
D3 228.8 283 5.0
old_Ra -FD- 304.5 17.5mm 3.0

The material is wood, an aluminum pipe(5&6mm), and a brass pipe(3&4mm).
5ele Yagi ANT is Impedance matchings are only 1:1 Balun.

2427MHz 7ele Yagi-Uda ANT
Element Spacing Length Height Diameter
Re 12.6mm 61.6mm 5.0mm
Ra -FD- 52.0 10.0mm 2.0
D1 11.7 53.3 5.0
D2 17.0 52.4 5.0
D3 26.0 51.4 5.0
D4 31.1 50.0 5.0
D5 35.0 48.0 5.0

Point of Design
Reproducibility improves when designing in wideband.
Impedance falls though it becomes wideband when the element is made fat, and Gain rises, too.
To raise Gain, the interval of Di is widened more than Re.

 The antenna simulation is confirmed.

The difference of the resonance frequency according to the shape of the loop was examined.
Loop model Side Loop length Area percentage MMANA-f0 NEC2-f0 difference percentage
Triangle 0.667m 2.0m 0.157m2 49.4% 165.77MHz 165.15MHz -0.62MHz 103.8%
Quadrangle 0.500 2.0 0.250 78.6% 163.96 163.21 -0.75 102.6%
Octagon 0.250 2.0 0.302 95.0% 160.96 160.12 -0.84 100.7%
16polygon 0.125 2.0 0.314 98.7% 160.52 159.06 -1.46 100%
Circle 0.318 2.0 0.318 100% ? ? ? ?
(Single loop,Line diameter 3mm)

The difference between the simulation and the measurement was examined.
Antenna MMANA(miniNEC) NEC-2 for MMANA difference Measured value difference
146MHz3eleYagi 146.1MHz 145.8MHz -0.3MHz 146MHz Close value
435MHz5eleYagi 436.5 432.5 -4.0 432 Close value
146MHz3eleLoop 147.5(octagon) 147.2(octagon) -0.3 146 It is lower
146MHz3eleLoop 146.14(16polygon) 146.12(16polygon) -0.02 146 Close value
435MHz4eleLoop 437.5(octagon) 437.1(octagon) -0.4 433.5 It is lower
435MHz4eleLoop 433.98(16polygon) 433.81(16polygon) -0.17 433.5 Close value

NEC-2 calculates the ground effect.

MMANA Data file of all antennas

ANT_JE2TLZ2018.zip

These Antennas were designed by using MMANA & NEC2 for MMANA.Thank you for wonderful software.

 Contents

最終更新時間:2021/03/13 22:55:19