Author: Junping Geng
Publisher: Springer Nature
ISBN: 9811590893
Category : Technology & Engineering
Languages : en
Pages : 188
Book Description
Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-direction. When feeding on two ends of the coaxial wire respectively, there will appear left hand circularly polarized (LHCP) omnidirectional radiation or right hand circularly polarized (RHCP) omnidirectional radiation. By introducing the T-shaped feed structure, the coaxial wire with slot array can conveniently produce the LHCP and RHCP radiation diversity with one end feeding. In the further, combining with the directional antenna, it will generate the pattern diversity in the half-sphere space. The antenna of the coaxial wire with slot array can further transform into conical CP beam antenna if the coaxial wire becomes into a conical frustum. By introducing the PIN diode into the slot, the antenna of the coaxial wire with slot array can radiate the reconfigurable directional beam by switching the states of the PIN diodes. By introducing a novel switchable microwave circuit, the omnidirectional /directional pattern switchable antenna can be realized easily.This book proposes a continues method to develop the potentialities of the omnidirectional antenna. And the readers can study the method or ideas of the omnidirectional slots antenna, even graft the CP or diversity methods to other antennae.
Omnidirectional Slots Antenna
Author: Junping Geng
Publisher: Springer Nature
ISBN: 9811590893
Category : Technology & Engineering
Languages : en
Pages : 188
Book Description
Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-direction. When feeding on two ends of the coaxial wire respectively, there will appear left hand circularly polarized (LHCP) omnidirectional radiation or right hand circularly polarized (RHCP) omnidirectional radiation. By introducing the T-shaped feed structure, the coaxial wire with slot array can conveniently produce the LHCP and RHCP radiation diversity with one end feeding. In the further, combining with the directional antenna, it will generate the pattern diversity in the half-sphere space. The antenna of the coaxial wire with slot array can further transform into conical CP beam antenna if the coaxial wire becomes into a conical frustum. By introducing the PIN diode into the slot, the antenna of the coaxial wire with slot array can radiate the reconfigurable directional beam by switching the states of the PIN diodes. By introducing a novel switchable microwave circuit, the omnidirectional /directional pattern switchable antenna can be realized easily.This book proposes a continues method to develop the potentialities of the omnidirectional antenna. And the readers can study the method or ideas of the omnidirectional slots antenna, even graft the CP or diversity methods to other antennae.
Publisher: Springer Nature
ISBN: 9811590893
Category : Technology & Engineering
Languages : en
Pages : 188
Book Description
Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-direction. When feeding on two ends of the coaxial wire respectively, there will appear left hand circularly polarized (LHCP) omnidirectional radiation or right hand circularly polarized (RHCP) omnidirectional radiation. By introducing the T-shaped feed structure, the coaxial wire with slot array can conveniently produce the LHCP and RHCP radiation diversity with one end feeding. In the further, combining with the directional antenna, it will generate the pattern diversity in the half-sphere space. The antenna of the coaxial wire with slot array can further transform into conical CP beam antenna if the coaxial wire becomes into a conical frustum. By introducing the PIN diode into the slot, the antenna of the coaxial wire with slot array can radiate the reconfigurable directional beam by switching the states of the PIN diodes. By introducing a novel switchable microwave circuit, the omnidirectional /directional pattern switchable antenna can be realized easily.This book proposes a continues method to develop the potentialities of the omnidirectional antenna. And the readers can study the method or ideas of the omnidirectional slots antenna, even graft the CP or diversity methods to other antennae.
A Quasi-omnidirectional Slot Array Antenna for Spacecraft Use at Microwave Frequencies
Author: W. F. Croswell
Publisher:
ISBN:
Category : Aperture antennas
Languages : en
Pages : 66
Book Description
Publisher:
ISBN:
Category : Aperture antennas
Languages : en
Pages : 66
Book Description
Omnidirectional Slots Antenna
Author: 耿军平
Publisher:
ISBN: 9787313271877
Category : Antenna radiation patterns
Languages : en
Pages : 0
Book Description
Publisher:
ISBN: 9787313271877
Category : Antenna radiation patterns
Languages : en
Pages : 0
Book Description
A Theoretical and Experimental Investigation of Combinations of Slot and Linear Antennas
Author: Stuart A. Long
Publisher:
ISBN:
Category : Antenna radiation patterns
Languages : en
Pages : 64
Book Description
The combination of a linear antenna and a slot antenna can be used to provide a relatively isotropic radiation pattern when the dipole is perpendicular to the plane of the slot. The theoretical far field radiation pattern of a dipole flanked by a two-element array of slot antennas is formulated. The fields for a variety of relative phasings between the elements of the combination antenna are calculated and the degree of approximation to an isotropic source in the sense of the total field noted. An experimental antenna was fabricated and the radiated fields measured with good agreement found with the theoretical formulas. (Author).
Publisher:
ISBN:
Category : Antenna radiation patterns
Languages : en
Pages : 64
Book Description
The combination of a linear antenna and a slot antenna can be used to provide a relatively isotropic radiation pattern when the dipole is perpendicular to the plane of the slot. The theoretical far field radiation pattern of a dipole flanked by a two-element array of slot antennas is formulated. The fields for a variety of relative phasings between the elements of the combination antenna are calculated and the degree of approximation to an isotropic source in the sense of the total field noted. An experimental antenna was fabricated and the radiated fields measured with good agreement found with the theoretical formulas. (Author).
Omnidirectional Slot Antenna Arrays
An Extremely Thin, Omnidirectional, Microwave Antenna Array for Spacecraft Applications
Author: Thomas G. Campbell
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 36
Book Description
Extremely thin, omnidirectional microwave antenna array for spacecraft applications.
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 36
Book Description
Extremely thin, omnidirectional microwave antenna array for spacecraft applications.
Omni-directional Annular-slot Antennas (section I). Matching Networks for Annular Slot Antennas (section Ii).
Omni-directional Annular Slot Antennas
Author: Robert William Bickmore
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
An Omnidirectional Flush-mounted Microwave Antenna with a Simple Feed for Use on Spacecraft
Author: C. R. Cockrell
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 34
Book Description
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 34
Book Description