Serial-feed for a circular patch antenna with circular polarization suitable for arrays

Abstract

A compact sequential‐rotation array with serial feed and three probes using multi‐layer substrate is proposed. The most compact shape for the microstrip patches are selected with the optimization for the axial ratio and return loss bandwidth. The gain, return loss, and axial ratio bandwidths of the antenna are improved significantly by converting three patches to one circular. The patch radius and the position of probes are selected to form circular Poynting vectors around it where the maximum power is present at large frequency range. While the two layers of the structure use similar board this structure only uses a substrate and three simple pins. Also the total area of the antenna is limited to the microstrip patch and it has a straightforward fabrication steps. So the wideband antenna is relatively inexpensive and compact. The antenna has 21.4% 3 dB axial ratio bandwidth in simulation and 21.1% in fabrication. Consequently, the serial‐multi‐fed circular patch with unique angular and phase arrangements is suitable for many applications as the antenna arrays. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:529–535, 2014.

Serial‐fed linear frequency diverse arrays for obtaining direction of arrival (DOA) of frequency modulated continuous waveform (FMCW) sources with ambiguity reduction

“…Schematic of the serial‐fed linear FDAs with N elements and separation d between the elements is indicated in Figure . Analysis of the serial‐fed antennas is straightforward and the equations are indicated in Figure …”

Dual-Band Circularly-Polarized Monopulse Antenna System With Single Layer Patches and Separated Feed Networks

“…3(d)). A simple solution with no reflections is given in [32], and it is explained that the impedance matching is not the only requirement while the power delivered by each probe should be akin with the others. Therefore, we should have |Z (i) in | = Z p /(N + 1 − i) for lossless lines.…”

“…The combination of this method with others improves the performance considerably [22][23][24][25][26][27][28][29][30]. A new technique is a serially fed sequentially rotated antenna array used for one multi-feed antenna in [31] as a shorted-annular-ring reduced-surface-wave patch antenna and in [32] as a three-probe-fed circular patch antenna suitable for arrays. This antenna is also used in this paper, for the monopulse system.…”

Meander Line Coupled Cavity-Backed Slot Antenna for Broadband Circular Polarization

“…A wideband sequential-phase fed circularly polarized patch array is proposed in [5], and a global bandwidth of 5.25-5.95 GHz is achieved (S 11 <-10dB, AR<3dB). A compact sequential rotation array with serial feed and three probes using multi-layer substrate is proposed in [6]. The gain, return loss, and AR bandwidths of the antenna are improved significantly by converting three patches to one circular.…”

“…Many research groups in the last few years have studied the broadband CP properties of antennas in the form of sequential rotation feed antennas [1][2][3][4][5][6], and cavity-backed slot antennas [6][7][8][9][10][11][12][13][14][15] and have presented various techniques of the matching skills in microstrip antennas.…”