• A wideband circularly polarized (CP) annular-ring patch antenna with two proximity-coupled L-probe feeds orientated to have phases of 0deg and 90deg, using a broadband 90deg hybrid feed, is proposed. It is found that the current distribution for CP operation can be improved by cutting a smaller concentric circular slot on the original larger circular patch to form an annular-ring patch.
• A broadband antenna capable of transmitting or receiving radio frequency signals. The antenna (16) includes a substrate (18) having a surface upon which a microstrip feed element (30) is positioned orthogonal to the substrate, and a portion of the antenna element (16) is positioned on and in direct contact with a portion of the microstrip feed element (30) for transmitting or receiving signals.

In this paper, a microstrip fed rectangular slot antenna with wideband characteristics is proposed. Both the impedance and radiation characteristics of the proposed antenna are presented. It is shown that a properly offset feed can give a dual resonance nature, which can be optimized to enable wideband behavior. In general, conventional bow‐tie slot antennas have broadband characteris. Microstrip‐fed bow‐tie‐shaped meander slot antenna with compact and broadband characteristics - Wi - 2005 - Microwave and Optical Technology Letters - Wiley Online Library. In contrast to a conventional wide‐slot antenna, the monopole‐like slot is not enclosed by the ground plane. The slot is surrounded by narrow ground strips, which makes the antenna compact. Two tapers are added at the corners of the upper folded ground strips to bevel the slot for enhancing impedance matching, especially at lower frequencies.

Home > Vol. 94 > pp. 343-349

Broadband Cross-shaped Microstrip-fed Slot Antenna Signal Booster

A NOVEL COMPACT ULTRA-WIDEBAND (UWB) WIDE SLOT ANTENNA WITH VIA HOLES

By D. Chen and C.-H. ChengFull Article PDF (473 KB)
Abstract:
A novel compact ultra-wideband (UWB) wide slot antenna with via holes is presented for UWB applications. The antenna is composed of a trapezoidal slot on the ground plane, a rectangular patch in the center of the slot and three via holes connecting the rectangular patch and the microstrip feed-line. The antenna is successfully designed, implemented, and measured. The measured results show that the proposed antenna with compact size of 27.0 mm×29.0 mm×1.0 mm achieves good performance, such as an impedance matching bandwidth of 111.7% ( S₁₁ ≤-10 dB), constant gain and stable radiation patterns over its whole frequency range.

Citation:
D. Chen and C.-H. Cheng, 'A Novel Compact Ultra-Wideband (UWB) Wide Slot Antenna with via Holes,' Progress In Electromagnetics Research, Vol. 94, 343-349, 2009.
doi:10.2528/PIER09062306
http://www.jpier.org/PIER/pier.php?paper=09062306

References:
1. Revision of Part 15 of the Communication's Rules Regarding Ultra-Wideband Transmission Systems, Federal Communications Commission, ET-Docket 98-153, FCC 02-48, 2002.
doi:10.1049/el:20001477

2. Jang, Y. W., 'Broadband cross-shaped microstrip-fed slot antenna,' Electron. Lett., Vol. 36, 2056-2057, 2000.
doi:10.1109/8.933480

3. Sze, J. Y. and K. L. Wong, 'Bandwidth enhancement of a microstrip-line-fed printed wide-slot antenna,' IEEE Trans. Antennas Propag., Vol. 49, 1020-1024, 2001.
doi:10.1109/7260.959318

4. Jang, Y. W., 'Experimental study of large bandwidth three-offset microstrip-fed slot antenna,' IEEE Microwave Wireless Com. Lett., Vol. 11, 425-427, 2001.
doi:10.1109/LAWP.2004.837510

5. Liu, Y. F., K. L. Lau, Q. Xue, and C. H. Chan, 'Experimental studies of printed wide slot antenna for wide-band applications,' IEEE Antennas Wireless Propag. Lett., Vol. 3, 273-275, 2004.
doi:10.1109/LAWP.2007.914115

6. Cheng, S., P. Hallbjorner, and A. Rydberg, 'Printed slot inverted cone antenna for ultrawideband applications,' IEEE Antennas Wireless Propag. Lett., Vol. 7, 18-21, 2008.
doi:10.1163/156939308784159534

7. Siahcheshm, A., C. Ghobadi, and J. Nourinia, 'Design of a quasiisosceles triangle slot antenna for UWB applications,' Journal of Electromagnetic Waves and Applications, Vol. 22, No. 5-6, 749-757, 2008.
doi:10.1163/156939308783122715

8. Siahcheshm, A., S. Sadat, C. H. Ghobadi, and J. Nourinia, 'Design of a microstrip slot antenna filled by an isosceles triangle for UWB applications,' Journal of Electromagnetic Waves and Applications, Vol. 22, No. 1, 111-118, 2008.
doi:10.1163/156939309788019732

9. Hu, S., W. B. Dou, and C. L. Law, 'A tapered slot antenna with flat and high gain for ultra-wideband applications,' Journal of Electromagnetic Waves and Applications, Vol. 23, No. 5-6, 723-728, 2009.
doi:10.1163/156939308787538026

10. Wang, X. M., L. Zhang, J. P. Xiong, and Y. C. Jiao, 'Printed microstrip-line-fed elliptical slot antenna with very wide bandwidth,' Journal of Electromagnetic Waves and Applications, Vol. 22, No. 14-15, 1865-1871, 2008.
doi:10.1163/156939308784158878

Broadband Cross-shaped Microstrip-fed Slot Antenna Booster

11. Eskandari, H. and M. Azarmanesh, 'A novel broadband design of a printed hexangular slot antenna for wireless applications,' Journal of Electromagnetic Waves and Applications, Vol. 22, No. 8-9, 1273-1282, 2008.