Single-Fed Low-Profile High-Gain Circularly Polarized Slotted Cavity Antenna Using a High-Order Mode

Abstract

In this letter, a single-fed low-profile high-gain circularly polarized slotted cavity antenna using a high-order cavity mode, i.e. TE 440 mode, is proposed. The proposed antenna has a simple structure which consists of a radiating linearly polarized slotted cavity antenna and a linear-to-circular polarization converter. An antenna prototype operating at WLAN 5.8 GHz band fabricated with low-cost standard printed circuit board (PCB) process is exemplified to validate the proposed concept. Measured results compared to their simulated counterparts are presented, and a good agreement between simulation and measurement is obtained.

A design of equilateral triangular ring SIW cavity‐backed slot antenna for multiband applications

“…For most dual bands antenna, the TM 11 is excited, but higher modes are needed to be excited by properly tuning the position of feeding point to form a multiband antenna. For an equilateral triangular path antenna, the lowest five operating modes are TM 10 , TM 11 , TM 22 , TM 12 , and TM 33 .…”

“…The reason is that resonant frequencies are decided by the sizes of the slot and SIW cavity. After parameter optimization, offset is chosen to 13.2 mm that results in four bands excited by TM 10 , TM 22 , TM 12 , and TM 33 .…”

“…The position of the feeding point is optimized to excite higher modes. Both of theoretical analysis and simulation are carried out to reveal the working mechanism of TM 10 , TM 22 , TM 12 , and TM 33 . It is convenient to adjust the resonance frequency by changing the side length of inner equilateral triangular.…”

“…To obtain circularly polarization and high gain, a higher TE440 mode is used in Ref. , and × 4 standing waves were observed at a square SIW cavity.…”

“…The proposed antenna is fed by a probe. By tuning the position of feeding point, four bands are generated by four different modes which are TM 10 , TM 22 , TM 12 , and TM 33 . The measured results of the prototype have a good agreement with simulation.…”