研究目的
To introduce a novel technique to realize a tilted radiation pattern in bowtie antennas for base station applications without the use of engineered materials, thereby eliminating the necessity for EBG unit cell structures which have a limited frequency bandwidth.
研究成果
The proposed technique successfully tilts the radiation pattern of bowtie antennas without the use of engineered materials, offering a simpler and more bandwidth-efficient solution for base station applications. The experimental results validate the numerical simulations, demonstrating the feasibility of the approach.
研究不足
The technique may result in a reduction in bandwidth and the maximum tilt achievable is limited. The printed version of the antenna shows a reduced useable bandwidth due to pattern degradation at higher frequencies.
1：Experimental Design and Method Selection:
The study involves altering the geometry of bowtie antennas to control the phase line and thus tilt the radiation pattern. Both triangular and elliptical bowtie antennas are studied in free space and printed versions are also investigated.
2：Sample Selection and Data Sources:
The antennas are designed with specific lengths and gap widths, and their performance is analyzed through numerical simulations and experimental measurements.
3：List of Experimental Equipment and Materials:
The study uses Rogers 5880 substrate for the printed antenna, and measurements are conducted using a Keysight Technologies E5071C ENA series network analyzer and a spherical near-field anechoic chamber.
4：Experimental Procedures and Operational Workflow:
The antennas are designed, simulated using ANSYS HFSS, fabricated, and then tested for reflection coefficients and radiation patterns.
5：Data Analysis Methods:
The performance of the antennas is analyzed based on their impedance bandwidth, radiation patterns, and beam tilt characteristics.
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