Wideband and Dual-Polarized Crossed Dipole Antenna Design Using Substrate-Integrated Coax

Abstract

A wideband and dual-polarized dipole antenna design technique is presented. The proposed antenna employs two sets of dipole elements in orthogonal configuration and separated by a dielectric layer. The dipole elements are excited with two separate substrate-integrated-coaxial feeds to achieve high port-toport isolation and the overall antenna stackup is enclosed in a substrate-integrated-waveguide (SIW) cavity.To validate the proposed substrate-integrated-coaxial fed dual-polarized antenna design method, a prototype antenna was fabricated using standard multilayer printed circuit board (PCB) manufacturing technologies to operate in the Ku-band. The measured and simulated results exhibit that the designed antenna has a wide impedance bandwidth of less than -10dB reflection coefficients at 10.28-14.8GHz and the port-to-port isolation between the two orthogonally polarized dipole antenna ports is greater than 20dB at most frequencies, making it suitable for many applications such as satellite communications. The antenna has a relatively stable gain pattern with a gain value of 5.5-6.5dBi and a low cross-polarization level (<16dB) over the operating frequency range.INDEX TERMS Dual-polarization, wide bandwidth, high port-to-port isolation, low cross-polarization, substrate-integrated-waveguide (SIW), printed circuit board (PCB) antennas, substrate-integrated coax

Circularly Polarized 4 × 4 Array Antenna with a Wide Axial Ratio Bandwidth

“…Due to their advantages, CP antennas have been widely adopted in various wireless communication applications such as wireless local area network (WLAN), Bluetooth, worldwide interoperability for microwave access (WiMAX), radio frequency identification (RFID), automatic dependent surveillancebroadcast (ADS-B), and global navigation satellite system (GNSS) [1][2][3][4][5]. Many kinds of CP antennas have been extensively reported about in recent years, designed to meet specific requirements, such as small form factors, dual-polarization, multi-band capabilities, and broader CP operation bandwidths [6][7][8][9][10][11][12][13][14][15][16]. In [9,10], CP antennas employing conventional slot-loaded microstrip patches fed by coplanar waveguide lines are discussed, but these can hardly be selected for the modern broadband communication due to the limitations of the CP bandwidth, even with advantages such as simple structures and low fabrication costs.…”

“…Many CP antennas with enhanced capabilities, particularly in terms of broad 3 dB AR bandwidth and suitable antenna gain, have been reported. Various shapes of crossed dipoles have been utilized to meet these requirements [11][12][13][14][15]. Miniaturized uniplanar crossed dipole structure has demonstrated approximately 50% impedance and AR bandwidth at 4 GHz with a peak gain of 2 dBic [11], and a CP antenna with a substrate integrated waveguide feed network was reported with about 30% CP bandwidth and greater than 20 dB port-to-port isolation characteristic [12].…”

“…Various shapes of crossed dipoles have been utilized to meet these requirements [11][12][13][14][15]. Miniaturized uniplanar crossed dipole structure has demonstrated approximately 50% impedance and AR bandwidth at 4 GHz with a peak gain of 2 dBic [11], and a CP antenna with a substrate integrated waveguide feed network was reported with about 30% CP bandwidth and greater than 20 dB port-to-port isolation characteristic [12]. To further improve the AR bandwidth, a non-planar reflector structure was employed, showing more than 120% impedance and AR bandwidth with 9.45 dBi gain [13].…”

A Novel Bow-Tie Balun-Fed Dual-Polarized Crossed Dipole Antenna

“…Conventionally, Coaxial cables and Microstrip baluns are frequently utilized to feed DPCDAs. Recently, the fractional bandwidths of several DPCDAs fed by coaxial cables [9][10][11][12][13] reached from 36% to 100%. Comparatively speaking, microstrip baluns increase design freedom.…”