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Author

Ze-Kun Pan

Bio: Ze-Kun Pan is an academic researcher from South China University of Technology. The author has contributed to research in topics: Microstrip antenna & Antenna (radio). The author has an hindex of 4, co-authored 6 publications receiving 125 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, an assembled dual-band quadrifilar helix antennas (QHAs) are proposed for applications in compass navigation satellite system (CNSS) of China, which are designed specifically to meet the requirements of the system: duplex communication service on two frequency bands (1.615 GHz and 2.492 GHz); broad beamwidth for circularly polarization (CP) applications.
Abstract: Assembled dual-band quadrifilar helix antennas (QHAs) are proposed for applications in Compass Navigation Satellite System (CNSS) of China. The assembled CNSS antennas proposed are designed specifically to meet the requirements of the system: Duplex communication service on two frequency bands (1.615 GHz and 2.492 GHz); Broad beamwitdh on radiation pattern and broad bandwidth for circularly polarization (CP) applications. In this paper, the structure of assembled CNSS QHAs is demonstrated first, which comprises of emitting and receiving QHAs with novel compact power divider networks. Then the method to control the radiation pattern of QHAs is analyzed. Moreover, the design principle of the compact power divider network to achieve broadband application is presented. In the end, the antenna was fabricated and measured. Experimental results show that the proposed assembled CNSS dual-band QHAs exhibit duplex operation, broad 3 dB beamwidth (>;180 deg), and broad 10 dB return loss bandwidth (emitting antenna 39%; receiving antenna 28%). In addition, the axial ratio is less than 1.5 on two frequency bands of the system (Uplink: 1615.68±7 MHz; Downlink: 2491.75±15 MHz).

68 citations

Journal ArticleDOI
TL;DR: In this article, a single-feed circularly-polarized (CP) wide beam microstrip antenna is proposed for CNSS application, which is designed with a double-layer structure, comprising a circular patch with two rectangular stubs along the diameter direction and a parasitic ring right above it.
Abstract: A compact single-feed circularly-polarized (CP) wide beam microstrip antenna is proposed for CNSS application. The antenna is designed with a double-layer structure, comprising a circular patch with two rectangular stubs along the diameter direction and a parasitic ring right above it. The resonance frequency and the CP characteristics are mainly controlled by the circular patch and the rectangular stubs, respectively. The vertical HPBW (half power beam width) could be widened by the parasitic ring. Experimental results show that the measured vertical HPBW is approximately 140° and the measured out-of-roundness for the horizontal radiation pattern is only 1.1 dB. Besides, it could maintain good low-profile characteristics.

68 citations

Proceedings Article
01 Dec 2011
TL;DR: In this article, a compact single-feed circularly-polarized (CP) antenna is proposed for CNSS dual-band applications, which comprises a small circular patch with embedded four spiral square slots around the boundary and a narrow slot in the center.
Abstract: A novel compact single-feed circularly-polarized (CP) antenna is proposed for CNSS dual-band applications The antenna comprises a small circular patch with embedded four spiral square slots around the boundary and a narrow slot in the center It is observed that the lower (1615MHz) and upper (2498MHz) resonance frequencies are controlled by the circular patch and the spiral slots The CP operation is mainly achieved by the narrow slot The antenna has a low profile and a small size with a radius of 197mm Experimental and measured results show that the proposed antenna has good circular polarization characteristics

6 citations

Patent
13 Feb 2013
TL;DR: In this paper, a circular polarization spiral antenna with high low elevation gain, which comprises a cylindrical spiral antenna radiator, a cross-shaped cross vibrator parasitic unit and a power division phase shift broadband microstrip feed network, is presented.
Abstract: The utility model discloses a circular polarization spiral antenna with high low elevation gain, which comprises a cylindrical spiral antenna radiator, a cross-shaped cross vibrator parasitic unit and a power division phase shift broadband microstrip feed network. The power division phase shift broadband microstrip feed network is positioned below the cylindrical spiral antenna radiator and is connected with the bottom of the cylindrical spiral antenna radiator; and the cross-shaped cross vibrator parasitic unit is positioned above the cylindrical spiral antenna radiator, and comprises two vertical vibrators, wherein when the vibrators are used as antenna directors, the length of the vibrators is less than half wavelength, and when the vibrators are used as antenna reflectors, the length of the vibrators is greater than the half wavelength. The antenna has the advantages of wide working frequency band, excellent directional diagram performance, high low elevation gain, compact structure and light weight.

5 citations

Patent
13 Nov 2013
TL;DR: In this article, a wide wave beam circularly polarized microstrip antenna provided with a parasitic circular ring in a loaded manner comprising an upper substrate, a lower substrate, and a fixing column disposed between the upper substrate and the lower substrate is presented.
Abstract: The wide wave beam circularly polarized microstrip antenna provided with a parasitic circular ring in a loaded manner comprising an upper substrate, a lower substrate, and a fixing column disposed between the upper substrate and the lower substrate An upper surface of the lower substrate is provided with a main radiation unit, and an upper surface of the upper substrate is provided with a parasitic circular ring paster unit A bottom surface of the lower substrate is provided with a floor, and an excitement port is disposed between the main radiation unit and the floor The main radiation unit is constituted by a circular paster and a pair of rectangular outer edge protrusions disposed on a diameter of the circular paster The utility model is advantageous in that the excellent radiation performance of the plane microstrip circularly polarized antenna can be maintained, the width of the radiation lobe of the vertical plane can be effectively broadened, and therefore the low elevation angle gains can be improved, and the debugging is convenient; compared to the conventional wide wave beam circularly polarized microstrip antennas, the antenna provided by the utility model is provided with a simpler structure, a smaller size, a lighter weight, and therefore the production costs can be reduced, and the antenna can be used in various small-sized terminal devices

4 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a polarization reconfigurable wideband circularly polarized (CP) antenna is proposed, which consists of four radiating arms connected to a reconfigured feeding network, and the antenna gain is stable across the operating bandwidth with the peak gain of 4.8dBic.
Abstract: This communication introduces a polarization reconfigurable wideband circularly polarized (CP) antenna, which consists of four radiating arms connected to a reconfigurable feeding network. The four radiating arms excited by the feeding network are able to generate wideband CP waves with bidirectional radiation patterns in free space. In order to increase the gain and obtain a broadside radiation pattern, the proposed antenna is placed above a metallic reflector with the distance of quarter wavelength at the center frequency. In addition, polarization reconfigurability is realized by utilizing PIN diodes in the feeding transmission lines such that left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) modes can be selectively excited by controlling the on / off states of the PIN diodes. The proposed antenna exhibits a wide impedance bandwidth of 80% and an overlapped axial ratio (AR) bandwidth of 23.5% for both modes. The antenna gain is stable across the operating bandwidth with the peak gain of 4.8 dBic. The antenna has a wide AR beamwidth of 90°. The presented work is suitable for GPS, CNSS, or RFID applications.

124 citations

Journal ArticleDOI
TL;DR: In this article, a polarization reconfigurable wheel-shaped antenna with wide bandwidth and conical-beam radiation pattern is proposed. But the antenna can operate at the downlink of standard C band (3.625 to 4.2 GHz) for geostationary satellite communication.
Abstract: This paper introduces a polarization reconfigurable wheel-shaped antenna with wide bandwidth and conical-beam radiation pattern. A wideband circular-monopolar patch surrounded by eight reconfigurable coupling loop stubs can generate conical-beam radiation patterns with different polarizations. This polarization reconfigurable characteristic is realized by controlling PIN diodes on the coupling loop stubs. The center-fed circular patch operates with the vertically-polarized conical-beam radiation and the coupling loop stubs radiate the horizontally-polarized wave propagation. With choosing proper magnitudes and phase differences between the two orthogonal radiations from the monopolar patch and the loop stubs, a circularly-polarized conical-beam radiation can be obtained. In addition, the presence of a back reflector yields a wide axial ratio bandwidth, enhances the front-to-back ratio of the radiation pattern, and avoids EM interferences between DC biasing lines and the antenna. This proposed antenna can generate three types of polarizations with the conical-beam radiation pattern including vertical polarization, left-handed circular polarization, and right-handed circular polarization by controlling the PIN diodes. Measured impedance and axial ratio bandwidths are 28.6% (3.45 to 4.6 GHz) and 15.4% (3.6 to 4.2 GHz), respectively, for the two CP modes. The maximum CP gain is 4.4 dBic. Furthermore, a dual-band operation (3.35 to 3.44 GHz and 4.5 to 4.75 GHz) can be observed for the LP mode. The antenna can operate at the downlink of standard C band (3.625 to 4.2 GHz) for geostationary satellite communication.

118 citations

Journal ArticleDOI
TL;DR: In this paper, a compact circularly polarized (CP) square-ring slotted patch antenna with vias is proposed for global navigation satellite systems (GNSS) with four square ring-shaped slots are cut symmetrically onto a square patch radiator along its diagonals for wide-angle CP radiation and miniaturization.
Abstract: A compact circularly polarized (CP) square-ring slotted patch antenna with vias is proposed for global navigation satellite systems (GNSS). Four square-ring-shaped slots are cut symmetrically onto a square patch radiator along its diagonals for wide-angle CP radiation and miniaturization. The antenna size is further reduced by grounding the central patches surrounded by the square-ring-shaped slots. An antenna prototype with an overall size of 60 mm × 60 mm × 5 mm shows a measured 10-dB return loss bandwidth of 90.0 MHz (1.565-1.655 GHz) with a maximum gain of 4.65 dBic. The measured 3-dB axial ratio (AR) bandwidth is 35.0 MHz (1.57-1.605 GHz) with a 3-dB AR beamwidth of more than 140 ° across the bandwidth.

105 citations

Journal ArticleDOI
TL;DR: In this paper, a wide-beam circularly polarized (CP) asymmetric microstrip antenna with four unequal circular-patches is proposed for global navigation satellite systems, which is integrated symmetrically onto corners of a square microstrip radiator for CP radiation with widebeamwidth.
Abstract: A wide-beam circularly polarized (CP) asymmetric-microstrip antenna with four unequal circular-patches is proposed for global navigation satellite systems. Four unequal circular-patches are integrated symmetrically onto corners of a square microstrip radiator for CP radiation with wide-beamwidth. The measured 3-dB axial ratio (AR) bandwidth of the proposed antenna is 24.0 MHz (1.568–1.592 GHz) with a 3-dB AR beamwidth of around 180° across the bandwidth and a 10-dB return loss bandwidth is 56.0 MHz (1.556–1.612 GHz) with a gain of more than 5.0 dBic. The overall size of the antenna is ${\bf {0.373}{\boldsymbol{\lambda}_{\bf o}} \bf{\times 0.373}{\boldsymbol\lambda}_{\bf o}} \bf{\times 0.016}{\boldsymbol{\lambda}_{\bf o}}$ at 1.6 GHz.

91 citations

Journal ArticleDOI
TL;DR: In this paper, the design, simulation studies, and experimental verification of an electrically small, low-profile, broadside-radiating Huygens circularly polarized (HCP) antenna are reported.
Abstract: The design, simulation studies, and experimental verification of an electrically small, low-profile, broadside-radiating Huygens circularly polarized (HCP) antenna are reported. To realize its unique circular polarization cardioid-shaped radiation characteristics in a compact structure, two pairs of the metamaterial-inspired near-field resonant parasitic elements, the Egyptian axe dipole (EAD) and the capacitively loaded loop (CLL), are integrated into a crossed-dipole configuration. The EAD (CLL) elements act as the orthogonal electric dipole (magnetic dipole) radiators. Balanced broadside-radiated electric and magnetic field amplitudes with the requisite 90° phase difference between them are realized by exciting these two pairs of electric and magnetic dipoles with a specially designed, unbalanced crossed-dipole structure. The electrically small (ka = 0.73) design operates at 1575 MHz. It is low profile $0.04\lambda _{\mathbf {0}}$ , and its entire volume is only $0.0018\lambda _{\mathbf {0}}^{\mathbf {3}}$ . A prototype of this optimized HCP antenna system was fabricated, assembled, and tested. The measured results are in good agreement with their simulated values. They demonstrate that the prototype HCP antenna resonates at 1584 MHz with a 0.6 dB axial ratio, and produces the predicted Huygens cardioid-shaped radiation patterns. The measured peak realized LHCP gain was 2.7 dBic, and the associated front-to-back ratio was 17.7 dB.

88 citations