Wideband Stub-Loaded Slotline Antennas Under Multi-Mode Resonance Operation

A novel center-fed wideband slotline antenna is proposed using the multi-mode resonance concept. By symmetrically introducing one or two pairs of slot stubs along the slotline resonator near the nulls of electric field distribution of the second odd-order mode, two modes are excited in a single slotline radiator. With the help of these stubs, the second odd-order mode can be gradually merged with its first counterpart, resulting in a wideband radiation characteristic with two resonances. Prototype antennas are then designed and fabricated to experimentally validate the principle and design approach. It is shown that the operation fractional bandwidth of the proposed slotline antenna could be effectively increased to 31.5% while keeping an inherent narrow slot structure.

[1]  K. Tong,et al.  Dual-Band Loop-Dipole Composite Unidirectional Antenna for Broadband Wireless Communications , 2014, IEEE Transactions on Antennas and Propagation.

[2]  Tayeb A. Denidni,et al.  Millimeter-Wave Compact EBG Structure for Mutual Coupling Reduction Applications , 2015, IEEE Transactions on Antennas and Propagation.

[3]  Hong-Bo Zhu,et al.  A novel broadband multislot antenna fed by microstrip line , 2005 .

[4]  Lei Zhu,et al.  A novel broadband microstrip-fed wide slot antenna with double rejection zeros , 2003 .

[5]  C. H. Cheng,et al.  An Ultrawideband (UWB) Slotline Antenna Under Multiple-Mode Resonance , 2012, IEEE Transactions on Antennas and Propagation.

[6]  Henry G. Booker,et al.  Slot aerials and their relation to complementary wire aerials (Babinet's principle) , 1946 .

[7]  Pezholil Mohanan,et al.  Design of a microstip fed step slot antenna for UWB communication , 2009 .

[8]  W. Menzel,et al.  Ultra-wideband (UWB) bandpass filters using multiple-mode resonator , 2005, IEEE Microwave and Wireless Components Letters.

[9]  Khalil H. Sayidmarie,et al.  Investigations Into Phase Characteristics of a Single-Layer Reflectarray Employing Patch or Ring Elements of Variable Size , 2008, IEEE Transactions on Antennas and Propagation.

[10]  Tapan K. Sarkar,et al.  Analysis of a wide radiating slot in the ground plane of a microstrip line , 1993 .

[11]  Hans Schantz,et al.  The art and science of ultrawideband antennas , 2005 .

[12]  Kin‐Lu Wong,et al.  Bandwidth enhancement of a microstrip-line-fed printed wide-slot antenna , 2001 .

[13]  Y. Jang,et al.  Broadband cross-shaped microstrip-fed slot antenna , 2000 .

[14]  Y. Yoshimura.  A Microstripline Slot Antenna (Short Papers) , 1972 .

[15]  J. Shaker,et al.  Loss Reduction in Reflectarray Designs Using Sub-Wavelength Coupled-Resonant Elements , 2012, IEEE Transactions on Antennas and Propagation.

[16]  S. Schelkunoff.  Theory of Antennas of Arbitrary Size and Shape , 1941, Proceedings of the IRE.

[17]  S. Latif,et al.  Bandwidth enhancement and size reduction of microstrip slot antennas , 2005, IEEE Transactions on Antennas and Propagation.

[18]  Behdad,et al.  A multiresonant single-element wideband slot antenna , 2004, IEEE Antennas and Wireless Propagation Letters.

[19]  Hong-bo Zhu,et al.  Improved Frequency Notched Ultrawideband Slot Antenna Using Square Ring Resonator , 2007, IEEE Transactions on Antennas and Propagation.

[20]  Horng-Dean Chen,et al.  Broadband CPW-fed square slot antennas with a widened tuning stub , 2003 .

[21]  S. Nam,et al.  Bandwidth Enhancement of Cavity-Backed Slot Antenna Using a Via-Hole Above the Slot , 2012, IEEE Antennas and Wireless Propagation Letters.

[22]  D. J. Sommers.  Slot Array Employing Photoetched Tri-Plate Transmission Lines , 1955 .