Articles published in:

A Reprint by Permission of antenneX Online Magazine http://www.antennex.com Issue numbers: 125 - 135.

Yagi Antenna Q factor

yagi_q_factor.pdf (285 kB)

Wet Antennas

wet_ant.pdf (220 kB)

Inverted Amos Antenna as Linear Feed for Cylindrical Parabolic Reflectror

linefeed.pdf (970 kB)

VHF Antenna Noise Temperature

vhfnoisetemp.pdf (750 kB)

Quados Antenna

quados.pdf (960kB)

Inverted Amos Antenna

invertamos.pdf (636kB)

Obelisk Antenna

Obelisk.pdf ( 990 kB)

Two el. Bi-quad Antenna Feed for 2.4 GHz

Feed for 2.4 GHz (2 MB)

Amos Antenna

Amos.pdf (1.3 MB)

3D Corner Reflector Antenna Feed for 5.8 GHz

3D_Corn_Refl_Feed.pdf (1.2 MB)

Shortened 3D Corner Reflector Antenna

S3DCRA.pdf (850 kB)

VHF/UHF Antennas

NEW!

Quados antennas

Compare gain and coverage angles of different Quados antennas:

Quados 4 sector Antenna for 2.4 GHz (2007)

New horizontal polarization antenna with 4 Quads and coverage angle of 70 deg. for -3 dB and 90 deg. for -6 dB for 2.4 GHz Wireless LAN Access Points.

Built by Trivke

Quados 6 sector Antenna for 2.4 GHz (2007)

New horizontal polarization antenna with 6 Quads and coverage angle of 70 deg. for -3 dB and 90 deg. for -6 dB for 2.4 GHz Wireless LAN Access Points.

quados.pdf (960kB)

Quados 8 sector Antenna for 2.4 GHz (2007)

New horizontal polarization antenna with 8 Quads and coverage angle of 70 deg. for -3 dB and 90 deg. for -6 dB for 2.4 GHz Wireless LAN Access Points.

Built by Trivke

NEW!

OBELISK sector antenna for 2.4 GHz WiFi (2007)

Very easy to build, very good antenna for Wireless LAN Access Points,

with vertical polarization and horizontal covering angle of 75-100 deg.

Obelisk.pdf ( 990 kB)

Built by Istvan YU7EW

Built by Velimir, 9A2VJ

NEW!

OBELISK sector antenna for 5.8 GHz WiFi (2007)

Very easy to build, very good antenna for Wireless LAN Access Points,

with vertical polarization and horizontal covering angle of 75-100 deg.

Built by Roman

Sagradio: Stojke

Amos antennas

Compare coverage angles of different Amos antennas:

Compare coverage angles of different Inverted Amos antennas:

Inverted Amos antenna is NOT Amos antenna with just rotated active dipole elements! Dimensions are different!

Omnidirectional antenna built from two Amos antennas

With two Amos antennas and 1:2 spliter it is possible to build omnidirectional antenna if they are mounted "back to back". It is very important that distance between reflectors is less then 1/10 wavelength or 12 mm at 2450 MHz. Pictures show directivity paterns of two Amos 5 antennas at distance of 10 mm.

Two Amos 7 antennas at distance of half wavelength (60 mm) produce horizontal radiation patern, as given on picture.

2 x Amos-9 Omni antenna

Built by: Djordje and Ćira, Trstenik

NEW!

AMOS 5 antenna for 2.4 GHz WiFi (2005)

Easy to build very good antenna for 13 cm amateur band and

Wireless LAN Access Points, covering 180 deg.

TXT in English:

PDF (5MB) DOC-ZIP (3.7MB)

Amos.pdf (1.3 MB)

Built by: Nebojša Rosić -rolex

Built by: http://www.brest-wireless.net/wiki/materiel:amos ,

http://www.brest-wireless.net/forum/viewtopic.php?id=75&p=2

( in English: http://www.larsen-b.com/Article/209.html )

Built by: Erwin, PE2ER (comments)

http://forum.wirelessnederland.nl/viewtopic.php?t=7428&highlight

http://home.wanadoo.nl/erwin.gijzen/wifisector/

Built by: Adam, 9A4QV

Built by: Vasko Ackovski

Built by: Velimir 9A2VJ

Built by: Sokrati Hasanu

NEW!

Inverted Amos 3 - sector antenna for 2.4 GHz WiFi (2006)

New version of Inverted Amos antenna with 3 dipoles, broader vertical angle and coverage angle of 85 deg. for -3 dB and 120 deg. for -6 dB.

NEW!

Inverted Amos 5 - sector antenna for 2.4 GHz WiFi (2006)

New version of Amos antenna with 5 dipoles and coverage angle of 75 deg. for -3 dB and 110 deg. for -6 dB.

Built by Trivke

NEW!

Amos 3 - wide angle antenna for 2.4 GHz WiFi (2006)

New version of Amos antenna with 3 dipoles, broader vertical angle and coverage angle of 110 deg. for -3 dB and 160 deg. for -6 dB.

Dimension error corrected.

NEW!

Inverted Amos 7 - sector antenna for 2.4 GHz WiFi (2006)

New version of Amos antenna with 7 dipoles and coverage angle of 75 deg. for -3 dB and 105 deg. for -6 dB.

Text in English: invertamos.pdf (636kB)

Built by NYC and Pota

Built by Trivke

NEW!

Amos 9 - wide angle antenna for 2.4 GHz WiFi (2006)

New version of Amos antenna with 9 dipoles and coverage angle of 130 deg. for -3 dB and 175 deg. for -6 dB.

Bilt by Cyrix

Built by Stojke

Inverted Amos 9 - sector antenna for 2.4 GHz WiFi (2006)

New version of Amos antenna with 9 dipoles and coverage angle of 70 deg. for -3 dB and 100 deg. for -6 dB.

Built by: Vasko Ackovski

Built by: Zlatko Čikvar

Built by: Stojke

Simple 2.4 GHz splitter for two antennas

SMA-conn.GIF (124 kB)

N-conn.GIF (113 kB)

Built by: Djura Stevanović

NEW!

Truncated 3D Corner Reflector Feed for Offset Dish at 5.8 GHz WiFi (2005)

Modified 3D Corner Reflector Feed for SAT TV offset parabolic dish

TXT in English:

3d_corn_refl_feed.pdf (1.2 MB)

Built by Spider and Pota

5.8 GHz 50 km link:

http://gallery.bgwireless.net/BGW-NSW

NEW!

2 el. BiQuad Feed for Offset Dish at 2.4 GHz WiFi (2005)

Optimized 2 el. Biquad Feed for SAT TV offset parabolic dish

TXT in English:

Feed for 2.4 GHz (2 MB)

Built by: Spider and Pota

Built by: hLAND and Sonyboy

NEW!

Shortened 3D Corner Reflector Antenna for 2.4 GHz WiFi (2005)

Optimized, easy to build, very good antenna for 13 cm amateur band and Wireless LAN as ideal antenna for clients

TXT in English:

PDF(883kB) DOC-ZIP(732kB)

S3DCRA.pdf (850 kB)

Built by: Pavel, 4N7TA

Built by: Adam, 9A4QV

Built by: Pol Isidor

Built by: Pavle Špoljarić

Shortened 3D Corner Reflector Antenna for 5.6 GHz WiFi (2006)

Built by: Igor Luburic

Modified 3D Corner Reflector Antenna for 2.4 GHz WiFi (2005)

This antenna is further more optimized and then described up as "Shortened 3D Corner Reflector Antenna"

Easy to build very good antenna for 13 cm amateur band and Wireless LAN

PDF(1.4MB) DOC-ZIP(940kB)

(TXT in Serbian)

Built by: DrARKO

Built by: maxrale

Built by: MiniC

Corner reflector antenna for 2.4GHz /zip 1900kB/ (2004.)

Easy to build antenna for 13 cm amateur band and Wireless LAN

Note: Due to program limitations reflector plane is simulated as grid structure. Grid is partially RF transparent because of large holes between grid wires. Consequently, simulated gain is about 1 dB less and radiation side lobes are increased.