Abstract
AbstractA compact and planar broadband circularly polarized (CP) eighth-mode substrate integrated waveguide (EMSIW) antenna is proposed in this paper. An isosceles right triangular waveguide with one electric sidewall (located on one of its catheti) and two magnetic sidewalls (located on the other two edges of the triangle) is presented to investigate the characteristics of the EMSIW. The closed-form mode solutions of the electromagnetic field components and the cut-off frequencies are derived for all propagating modes in this triangular waveguide. The simulated electromagnetic field distribution is consistent with the analytical results. The resonant frequencies of the EMSIW cavity are then determined. A CP antenna consisting of four EMSIW elements is designed, fabricated, and measured. The measured 3-dB axial ratio bandwidth of the antenna is 21.6% from 4.72 to 5.86 GHz. Within this frequency range, the measured reflection coefficient is below −10 dB, and the measured peak gain in circular polarization at broadside is 6.89 dBic at 5.1 GHz.
Highlights
The demand for compact and planar circularly polarized (CP) antennas is rapidly increasing, due to their wide application in satellites and wireless communication systems
It is demonstrated that the half-mode substrate integrated waveguide (HMSIW) can be obtained from bisecting the Substrate integrated waveguide (SIW) along its fictitious magnetic wall [5, 6]
The research reported in [12] presents a CP antenna based on an eighth-mode substrate integrated waveguide (EMSIW) sub-array whose array elements and feeding network are connected by means of four coaxial cables, and the height of each coaxial cable is a quarter wavelength
Summary
The demand for compact and planar circularly polarized (CP) antennas is rapidly increasing, due to their wide application in satellites and wireless communication systems. The proposed isosceles right triangular waveguide with one electric wall on one of its catheti (y = 0) and two magnetic walls on the other edges (y = x, x = a) supports the propagation of TE and TM modes. In the proposed isosceles right triangular waveguide, the mode functions subject to the boundary conditions can be obtained using appropriate linear combinations of TEmn or TMmn modes in the discussed square waveguide that have the same cut-off frequencies. The field components for the TEmn modes can be obtained (6) from (6) as describes possible TE modes in the discussed square waveguide The cut-off frequencies of the TEmn and TMmn modes for the discussed isosceles right triangular waveguide are given by fcmn c 2p√1r mp np. The closed-form expressions of the field components for the dominant TM11 mode can be obtained from (12) and (13)
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