A log-periodic antenna with vertically polarized omnidirectional radiation

Solosko, R.; Laxpati, S.

doi:10.1109/tap.1968.1139290

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…In free space propagation, a polarization misaligned CP antenna will give a maximum of 3 dB loss. Most omnidirectional antennas are linearly polarized or dual linearly polarized [3,[15][16][17][18], of which many configurations require ground plane [9][10][11][12][13][14][15][16][17][18][19][20][21]. Similarly CP omnidirectional antennas are of two categories, one which require ground plane (slot type or monopole type) [2,5,[22][23][24][25] and other which do not require ground plane (frequency independent antennas, Quadrifilar Helix Antenna (QHA) and orthogonally oriented vee dipoles) [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

Yousaf¹,

Amin²,

Iqbal³

2013

PIER C

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Abstract-In this paper, design and analysis of omnidirectional single feed circularly polarized, wide axial ratio beamwidth resonant side-fed bifilar helix antennas that do not require a ground plane is presented. The simulation and measurement results show that side-fed helix antennas of various radii gives near perfect circular polarization (CP) almost over the whole sphere except at and around nulls, at a certain turn angle by properly proportioning the area of loop (A) with the product of pitch (ρ) and radianlength (l ) of helix. Helix antennas with smaller radii give axial ratio (AR) close to one at higher values of turn angle with lower value of resonant input impedances but CP is less sensitive to inaccuracy in turn angle. However helix antennas with larger radii results in AR close to one at lower values of turn angle and provides better values of input resistance but its AR is more sensitive to variations in turn angle. The simulated results show that the polarization solid angle beamwidth (for AR ≤ 3 dB) varies from 3.96π to 4π steradian. The gain and 3 dB beamwidth of the antennas are 2 dBi and 90 • respectively. The polarization bandwidth varies from 34% to 65%. The simulated results are verified by experimental measurements.

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Section: Introductionmentioning

confidence: 99%

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

Yousaf¹,

Amin²,

Iqbal³

2013

PIER C

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“…In free space propagation, a polarisation misaligned CP antenna will give a maximum of 3 dB loss. Most omnidirectional antennas are linearly polarised or dual linearly polarised [1, 9–13], of which many configurations require ground plane [14–17]. Similarly, CP omnidirectional antennas are of two categories, one which require ground plane (slot type or monopole type) [14, 18–24] and other which do not require ground plane (frequency independent antennas, quadrifilar helix antenna (QHA) type and orthogonally oriented vee dipoles) [25–27].…”

Section: Introductionmentioning

confidence: 99%

Single feed circularly polarised omnidirectional bifilar helix antennas with wide axial ratio beamwidth

Amin¹,

Yousaf²,

Iqbal³

2013

IET Microwaves, Antennas & Propagation

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This study presents design and analysis of single feed omnidirectional circularly polarised resonant side-fed bifilar helix antennas with wide axial ratio (AR) beamwidth that does not require a ground plane. The simulation results show that side-fed helix antennas of various radii give polarisation beamwidth (for AR ≤3 dB) from 170°to 178°in elevation planes at a certain turn angle where area of the loop equals the product of pitch and radianlength of the helix. Circularly polarised helix antennas with smaller radii are of higher turn angle, have lower value of resonant input impedances but AR is less sensitive to inaccuracy in turn angle and vice versa for helix with larger radii. The gain and 3 dB beamwidth of the antennas are 2 dBi and 90°, respectively. The polarisation bandwidth (for AR ≤3 dB) varies from 34 to 65%. The simulated results are verified by experimental measurements.

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“…In free space propagation, a totally misaligned CP antenna will give a maximum of 3dB loss. Most omnidirectional antennas are linearly polarized or dual linearly polarized [3], [13]- [16], of which many conſgurations require ground plane [17]- [19]. Similarly CP omnidirectional antennas are of two categories, one which require ground plane (slot type or monopole type) [2], [5], [20]- [22] and other which do not require ground plane [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

Circularly polarized wide axial ratio beamwidth omnidirectional bifilar helix antennas

Yousaf

Amin

Iqbal

2012

2012 IEEE First AESS European Conference on Satellite Telecommunications (ESTEL)

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In this paper, analysis and design of omnidirectional single feed circularly polarized, wide axial ratio beamwidth resonant side-fed biſlar helix antennas not requiring ground plane is presented. The simulation and measurement results show that side-fed helix antennas of various radii gives near perfect circular polarization (CP) almost over the whole sphere except at & around nulls, at a certain turn angle that corresponds to the formula A = ρl given in [1], where A is the area of loop, ρ is the pitch of the helix and l is the radianlength. Helix with smaller radii gives axial ratio (AR) close to one at higher values of turn angle with lower value of resonant input impedances but CP is less sensitive to inaccuracy in turn angle. However helix with larger radii results in AR close to one at lower values of turn angle and provides better values of input resistance but its AR ismore sensitive to variations in turn angle. The simulated results show that the polarization solid angle beamwidth (for AR ≥ -3dB) varies from 3.96π to 4π steradian. The gain and 3dB beamwidth of the antennas are 2dB and 90 o respectively. The polarization bandwidth varies from 34% to 65%. The simulated results are veriſed by experimental measurements. Index Terms-circular polarization, omnidirectional antenna, axial ratio .

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A log-periodic antenna with vertically polarized omnidirectional radiation

Cited by 3 publications

References 1 publication

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

Single feed circularly polarised omnidirectional bifilar helix antennas with wide axial ratio beamwidth

Circularly polarized wide axial ratio beamwidth omnidirectional bifilar helix antennas

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