Antenna_e

Homemade Antenna used for satellite and HF communication.

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

Top Loading Verttical Dipole

• The material
  • Fishing rod of fiberglass(5.4m or 6.3m)
  • Electric wire
  • Aluminum line(2 or 2.5mm in diameter)
  • Plastic Pen stand, Plastic board
  • 1:1Balun

Upper Element by 0.9m above from the coil at the time of 1.79m last from the coil.
The length of the Coil is 11cm, and 9cm in the diameter.
Photograph of Hi-Q Loading Coil

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

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	232.3mm	729.8mm	3.0mm
Ra	--	218.0	685	3.0
D1	193.5	213.8	671.7	3.0
D2	195	211.0	663.6	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	231.7mm	728.0mm	3.0mm
Ra	--	218.0	685.0	3.0
D1	173	210.4	661.0	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.

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_je2tlz.lzh

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

Contents

• Homemade Antenna used for satellite and HF communication.
• Top Loading Verttical Dipole
• Loop Antenna
• Yagi-Uda Antenna
• The antenna simulation is confirmed.
• MMANA Data file of all antennas
• Contents