Compact Microstrip Magnetic Yagi Antenna and Array With Vertical Polarization Based on Substrate Integrated Waveguide

Abstract

Abstract-A compact magnetic Yagi antenna and a four-element array with vertically polarized radiation are presented using the substrate integrated waveguide (SIW) technology. The SIW functions as driven element to generate vertically polarized wave. Microstrip patches are connected to ground plane function as magnetic dipole directors. With this arrangement, a compact magnetic Yagi antenna with vertically polarized radiation is designed. The total area is only 1.58λ 1 × 0.95λ 1 (λ 1 represents the wavelength at 9.5 GHz) and reduced by 63.1% compared to previous magnetic Yagi antenna. The relative bandwidth is 16.15% and peak gain 7.31 ∼ 8.82 dBi. Then the four-element linear array is analyzed, fabricated and measured. Simulated and experimental results demonstrate that the array antenna still preserves vertical polarization, and the peak gain is 14.06 ∼ 14.78 dBi in the relative bandwidth of 14.43%.

Microstrip Magnetic Dipole Yagi Antenna With Enhanced Impedance Bandwidth and Reduced Size for Wideband Wireless Applications

“…Microstrip magnetic dipole Yagi antennas have attracted great attention due to their merits of simplicity in structure, low profile, light weight, low fabrication cost, broad bandwidth, realizing unidirectional radiation with high gain and vertical polarization, and suitability for integration with microwave circuits [1][2][3][4][5][6][7][8]. With the inherent vertical polarization characteristic, when microstrip magnetic dipole Yagi antennas are employed in the communication systems on a horizontal platform, such as ground-wave communications, transmitter and receiver can keep the same vertical polarization for good connection when the transmitter or receiver rotates on the platform.…”

“…With more director elements, they can be applied in point-to-point communications that need a narrow beam at endfire with vertical polarization as well. Moreover, since the feature of broad bandwidth is becoming increasingly necessary due to the high data rate required by modern services, some newly published microstrip magnetic dipole Yagi antennas in [6][7][8] focus on the realization of broad bandwidth with various microstrip magnetic dipole Yagi antenna structures. In [6], a low-profile 4-element Yagi array based on microstrip magnetic dipole antennas with vertical polarization achieves an impedance bandwidth of 13.1% around 5.21 GHz, whereas its size of 2.08λ 0 × 1.91λ 0 is not compact.…”

“…In [6], a low-profile 4-element Yagi array based on microstrip magnetic dipole antennas with vertical polarization achieves an impedance bandwidth of 13.1% around 5.21 GHz, whereas its size of 2.08λ 0 × 1.91λ 0 is not compact. In [7], a compact magnetic Yagi antenna with vertical polarized radiation was presented using the substrate integrated waveguide (SIW) technology. The SIW functions as the driven element to generate vertically polarized wave and realize miniaturization, and the design of reflector is omitted.…”

“…The SIW functions as the driven element to generate vertically polarized wave and realize miniaturization, and the design of reflector is omitted. The proposed antenna in [7] obtains an impedance bandwidth of 16.15% and a compact size of 1.58λ 0 ×0.95λ 0 . In [8], a compact vertically polarized microstrip Yagi antenna based on the half-mode substrate integrated waveguide (HMSIW) technology obtains an impedance bandwidth of 10.5% and a very compact size of 1.82λ 0 ×0.57λ 0 .…”

Electromagnetic Waves Radiation by a Vibrators System With Variable Surface Impedance

“…Systems of perfectly conducting vibrators are widely used both as antennas with directional axial radiation and as a multi-element antenna array in the meter and decimeter wave bands [1][2][3][4][5][6][7][8][9][10]. An additional parameter, which allows forming a required amplitude-phase distribution of vibrators currents, and thus, modifying and optimizing the electromagnetic characteristics of the system as a whole, can be distributed surface impedance (both constant and variable along the vibrator length) [11][12][13][14][15][16].…”