Broadband circularly polarised stacked antenna with sequential‐phase feed technique

Abstract

A broadband circularly polarised (CP) stacked antenna with a sequential‐phase feed technique is proposed in this study. The antenna contains a square ring that is encircled by four driven patches. The gap‐coupled feed method is used to transfer energy from the square ring to the driven patches. Moreover, four stacked patches are placed above the bottom layer to enhance the impedance and CP bandwidths. The measured results yield an impedance bandwidth of 33.6% (4.78–6.71 GHz) and a wide 3 dB axial ratio bandwidth of 19.4% (4.90–5.95 GHz) is obtained. The average gain is ∼9 dBi and the variation of gain is <1 dB within the CP bandwidth.

Design of a Novel Circularly Polarized MIMO Antenna with Enhanced Isolation for Ultra-wideband Communication

“…Circular polarization (CP) can effectively reduce these deficiencies of linear polarization and improve the stability of the system. Some of the papers proposed design methods to achieve broadband or ultrawideband circular polarization [10][11][12][13][14][15][16][17]. [10,11] utilized open slot etched on the side of the coplanar ground to achieve wideband circular polarization in 3.3-3.8 GHz and 3.1-7.2 GHz separately.…”

“…By embedding two symmetrical rectangular ground planes with L-shaped slots in diagonal corners of the slot, [12,13] realized wideband circular polarization. In [14] and [15], structures of sequential phase network were adopted to achieve 5-6 GHz CP. [16] introduced an antipodal structure of four different strips with a microstrip line to excite two orthogonal modes and produced circular polarization in a wide band of 4.4-7.7 GHz.…”

A low‐profile ultrawideband circularly polarized slot antenna array based on artificial magnetic conductor array reflector

“…Even though a CP antenna with a single radiator element has the advantage of small size, it usually cannot achieve a good axial beam radiation (main beam at boresight direction +z = 0°) across the entire CP bandwidth. Therefore, many antenna designs have adopted the technique of developing antenna arrays that can achieve stable broadband CP radiation with axial beam 11–20 . Especially with the change of frequency, the axial beam radiation characteristic of the pattern is very stable too.…”

“…Therefore, many antenna designs have adopted the technique of developing antenna arrays that can achieve stable broadband CP radiation with axial beam. [11][12][13][14][15][16][17][18][19][20] Especially with the change of frequency, the axial beam radiation characteristic of the pattern is very stable too.…”

A Compact Wideband Circularly Polarized Microstrip Slot Antenna with Parasitic Elements

“…Additionally, based on the SP feed-network, the stacked technology is effective in CPAAs [21][22][23][24][25]. Round [21] and rectangular [22] patches as parasitic elements are stacked above the SP rotated feeding structure, which realize 6% and 28.1% of CP bandwidth, respectively.…”