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A Simple, Compact Filtering Patch Antenna Based on Mode Analysis With Wide Out-of-Band Suppression.
- Source :
- IEEE Transactions on Antennas & Propagation; Oct2019, Vol. 67 Issue 10, p6244-6253, 10p
- Publication Year :
- 2019
-
Abstract
- A simple, compact filtering patch antenna with wide out-of-band suppression is presented, where the filtering mechanism is first analyzed and implemented based on mode analysis of a conventional patch antenna. According to the mode analysis, undesired higher-order modes can be effectively suppressed by selecting a proper length ratio of two sides of the patch and the feeding position, thus realizing a wide upper stopband. To further enhance the filtering response, another two simple filtering structures loaded on the patch antenna are also proposed. First, a split-ring-shaped slot is etched on the patch to generate a radiation null at the lower-band edge for improving skirt selectivity. Second, a U-shaped strip is etched underneath the patch and connected with the feeding probe, which can introduce another null at the upper band edge. As a result, a high suppression level of 23 dB in lower and upper stopbands can be realized, respectively, for the proposed filtering antenna, while the upper stopband can extend up to $2.3 f_{0}(f_{0}$ is the center frequency of the antenna). Furthermore, wide passband response can also be achieved by the extra in-band resonances existing in the slot and the strip. A filtering antenna prototype is fabricated and measured for demonstration. Good agreements between the simulated and the measured results are observed, indicating a large impedance bandwidth of 22.6%, high antenna efficiency of 95.6%, and an average gain of about 7.4 dBi. Compared with the reported filtering antennas, the proposed filtering antenna can achieve better wideband filtering response but with a simpler configuration. [ABSTRACT FROM AUTHOR]
- Subjects :
- ANTENNAS (Electronics)
BANDPASS filters
FILTERS & filtration
SLOT antennas
Subjects
Details
- Language :
- English
- ISSN :
- 0018926X
- Volume :
- 67
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Antennas & Propagation
- Publication Type :
- Academic Journal
- Accession number :
- 139077174
- Full Text :
- https://doi.org/10.1109/TAP.2019.2922770