Novel Circularly Polarized Siw Cavity-Backed Antenna With Wide Cp Beamwidth by Using Dual Orthogonal Slot Split Rings

Abstract

Abstract-A circularly polarized (CP) substrate integrated waveguide (SIW) cavity-backed antenna based on dual concentric, orthogonal slot split ring resonators is proposed and experimentally studied. The circularly polarized wave is generated by two split ring-slots etched in the upper metal layer of the SIW cavity resonator. These two slots are excited by a coaxial probe located in the gap of the external slot split ring to radiate the right-handed circularly polarized (RHCP) wave. By rotating the dual split slot ring resonators and the probe by 45 degrees relative to the backed cavity, a better match characteristic and a slightly higher radiation gain are obtained. Because of the concentricity of radiant split ring slots, the beamwidth of the circular polarization is obviously increased. From the experimental results, the impedance bandwidth was 10.8% for the reflection coefficient less than −10 dB, the axial ratio (AR) bandwidth was 1.54% for the AR less than 3 dB, and the RHCP gain was 4.44 dBic. Moreover, the 3-dB axial ratio beamwidth at the centre frequency of 10.40 GHz has been extended to 142 • in the angular range from −78 • to +64 • .

Design of a Long Linear Helical Subarray for High-Power Cylindrical Conformal Array Antenna

“…However, there are few reports of high-power conformal arrays at this stage. Common conformal [12][13][14][15][16] antenna forms such as microstrip patches and SIW antennas [17][18][19][20][21] are difficult to adapt to the requirements of high power capacity due to the existence of their dielectric structure. The existing research on high-power array antennas is mainly focused on planar arrays, which size is difficult to meet the needs of high-power conformal arrays.…”

Bandwidth Enhancement of Low-Profile Siw Cavity Antenna With Bilateral Slots

“…Recently, some solutions aimed at enhancing the bandwidth of cavity antennas have been investigated [5][6][7][8][9][10][11][12][13][14][15][16]. In [5], a SIW cavity antenna with a unilateral slot was reported, in which one cavity mode was excited by a probe feeding and energy was radiated from the etched slot.…”

“…The other method to enhance antenna's bandwidth is to merge multiple resonant modes in a single passband [12][13][14][15][16]. In [12], a unilateral non-resonant slot was utilized as the radiating element, which effectively excited two hybrid cavity modes.…”

“…A cavity antenna with a bow-tie slot is also proposed in [13]. A probe-fed cavity antenna with two unilateral radiating slots was investigated in [14]. Though the bandwidth was extended, circularly polarized radiations were achieved.…”

Substrate Integrated Waveguide Without Metallized Wall Posts

“…It gives similar performance advantages of a dielectric filled rectangular waveguide such as signal isolation from the surroundings, low loss propagation and small footprint [3]. Several passive devices based on rectangular waveguide and some novel proposals have been implemented in SIW [4][5][6][7][8][9][10][11] in the recent years. Several variations of SIW are introduced to achieve the same level of performance with reduced size and complexity such as half mode SIW (HMSIW) and folded half-mode SIW (FHMSIW) [12,13].…”