A metamaterial-based broadband low-profile mushroom antenna is presented. The proposed formed using an array of cells and a ground plane, fed by microstrip line through slot cut onto the plane. With feeding right underneath center gap between cells, dual resonance modes are excited simultaneously for radiation at boresight. transmission-line model integrated with dispersion relation composite right/left-handed structure applied to analyze modes. dielectric-filled (ε <sub...

A metamaterial-based broadband low-profile grid-slotted patch antenna is presented. By slotting the radiating patch, a periodic array of series capacitor loaded metamaterial cells formed, and excited through coupling aperture in ground plane right underneath parallel to slot at center patch. exciting two adjacent resonant modes simultaneously, impedance matching consistent radiation are achieved. The dispersion relation capacitor-loaded cell applied mode analysis. proposed with low profile...

The single- and dual-layer metasurfaces are proposed to miniaturize a low-profile wideband antenna. consist of one two square patch arrays, respectively, both supported by grounded dielectric substrate form the waveguided metamaterials. After retrieving effective refractive index along propagation direction in metamaterial, constant is subsequently derived initially estimate resonant frequencies dual-mode With increased index, antennas realize gain greater than 6.5 dBi over bandwidth ~30%...

A spoof plasmon (SP)-based slow-wave feeding configuration is proposed, experimentally verified and exploited to excite the fundamental horizontally polarized mode of dielectric resonator antennas (DRAs). As an example, a cylindrical DRA operating at 3 GHz fed by proposed structure. The simulation measurement evidence unique features TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01δ</sub> such as lower thickness-dependency resonant...

A broadband low-profile L-probe fed metasurface antenna is proposed by well exciting both transverse magnetic (TM) leaky wave and electric (TE) surface resonances. The composed of an array rectangular metallic patch cells. An L-shaped probe positioned underneath the finite utilized to excite a TM resonance TE simultaneously for operation. dispersion properties are used analyze dual modes. achieves broad -10 dB impedance bandwidth 34.5% with peak gain 10.3 dBi front-to-back ratio larger than...

A low-profile broadband metamaterial-mushroom antenna array is proposed for high-gain 60-GHz band applications. The consists of a single-layer mushroom radiating structure and simplified substrate integrated waveguide (SIW) feeding network. new transmission-line based model presented to estimate the resonant frequencies operating TM10 antiphase TM20 modes. With structure, closely-placed elements realize less mutual couplings, higher aperture illumination efficiency compared conventional...

A low-profile metasurface-based dipole antenna is proposed, analyzed, and implemented for the wideband operation with improved gain. The metasurface suspended by separating it from ground plane an air gap positioning right beneath a horizontally oriented dipole. wide operating bandwidth attributed to simultaneous excitation of transverse electric surface wave resonance (SMS) adjacent resonance. small propagation constant magnetic in band enlarges SMS aperture along direction higher gain...

Recently, there has been growing interest in the use of metamaterial (MTM)-based lenses, also known as metalenses, innovative antenna technology. Increasingly widespread applications metalenses modern microwave communication and sensing systems have found, following development first artificial lens 1940s based on concept an dielectric, which was later broadly termed "MTM. " This article examines evolution metalens antennas over past 80 years introduces principles technologies underlying...

In this letter, a balanced-to-balanced power divider (PD) is proposed. By etching both slot and aperture on the common ground of back-to-back microstrip Wilkinson PD, proposed PD can achieve wide high common-mode (CM) suppression while keeping function for differential-mode signals. Compared with previous technologies CM balanced circuits, one has advantage compact size. Furthermore, shows enhanced bandwidth matching isolation. A prototype realized size 0.35 λ <sub...

A balanced filtering branch-line coupler is proposed for the first time. The design realized by coupled microstrip lines and coupled-line-fed coupling structures. Based on this, not only exhibits functions of power dividing differential-mode signals, but also can suppress common-mode noise/signal be easily connected with other circuits. dimension similar to that traditional single-ended design. prototype centered at 1.87 GHz size 0.33 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A miniaturized wideband non-uniform metasurface antenna is proposed and analyzed using an equivalent circuit model. The nonuniform consists of array rectangular metallic patches separated by varying gaps. effects the gap widths on resonant frequencies dual-mode are studied frequency first TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode decreases with narrowing either center or side gaps; antiphase...

To optimize the reception and transmission in real-time changing links, phased array antennas have been increasingly investigated applied satellite applications. The antenna technology intelligently combines multiple individual elements to improve system performance terms of gain enhancement, interference cancellation, radiation patterns formation, beam steering over a wide coverage. This article updates latest development metamaterial-based (metantenna) antennas. With metama-terials' unique...

A Z-shaped slot is proposed to excite broadband circularly-polarized (CP) radiation from a slotted patch antenna. Operating mechanism of the feeding illustrated and validated by an antenna prototype operating at 5-GHz Wi-Fi bands. The measured results show that CP achieves impedance bandwidth 47% for |S11| ≤ -10 dB axial ratio (AR) 28% 3 with single feed low profile.

A miniaturized low-profile broadband metasurface antenna by using stepped impedance resonators (SIRs) is presented. H-shaped SIR elements are employed in the proposed aperture coupled antenna. The exemplified with a footprint of 11.8mm × 11.0mm 1.524mm (0.40λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> 0.37λ 0.05λ at center frequency 10.1 GHz) shows operating frequencies over range 9.43-10.77 GHz and gain ranging from 6.1 dBi to 7.8 dBi.

An ultra-thin differential patch antenna is proposed for head implants. Through the proximity coupling between rectangular and loop structure fed by a microstrip line, an antiphase mode excited, which doubles bandwidth of aperture-coupled antenna. Moreover, directional radiation allows maximum energy to be directed receiver lowers specific absorption rate (SAR). prototype with overall size 24 × 10 0.95 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The substrate integrated waveguide (SIW)-slot feeding structure is introduced in a fully substrate-integrated thin Fabry-Pérot cavity (FPC) antenna to achieve the boresight radiation free of beam squint and with low backward levels. Single longitudinal slot symmetrically cut onto broadwall (the ground plane FPC) SIW proposed feed FPC order point maximum at avoid frequency-dependent caused by conventional asymmetrically edge-fed patch. beam-squint variation 11.3 ° along patch significantly...

A metasurface-based compact wideband circularly polarized (CP) antenna is proposed. The composed of dual-layer overlapping metasurface coupled by cross-slot through single series stripline feed. 64-element CP phased array with a scan angle up to 30 degree off the boresight direction shows gain higher than 22 dBic, active reflection coefficient less −9 dB, axial ratio 3 and side-lobe levels −10 dB from 28 GHz 31 GHz.

A broadband helical liquid antenna made of saline water is proposed. transparent hollow support employed to fabricate the antenna. The rotation structure fabricated with a thin flexible tube. concentration 3.5% can be injected into or extracted out from tube change quantity solution. Thus, tunability radiation pattern could realised by applying fluidity liquid. feature compared that metal one, and fairly good agreement has been achieved. Furthermore, three statements performance...

The stripline aperture coupling structure is introduced to lower the back radiation of a broadband low-profile metamaterial mushroom antenna. Compared feeding microstrip line coupling, coupled antenna exhibits front-to-back ratio enhancement 2-14 dB within an operating frequency range 4.7-6.0 GHz.

We present the recent progress in developing mushroom and metasurface antennas for low-profile broadband applications. The metamaterial-based antenna technology is first developed to realize boresight-radiation with low profile on PCB LTCC substrates operating from microwave millimeter-wave bands. As a variation of original antenna, vialess are proposed along miniaturization technique. Finally, shorting-wall loaded new mechanism reported as well.

This paper presents an introduction to a deformable plasma antenna excited by alternating current power supply at frequency of 12 kHz. The discharge tube could be transformed into many types shapes, such as monopole, U-shape, loop, helix, or plane, means simple mounting and rotating system. characteristics the were studied for various parameters shapes. Experimental results demonstrate that characteristics, impedance, radiation pattern, gain, polarization, can simply controlled varying...

Lens antennas have long been used at millimeter-wave bands and above because of their excellent power focusing performance, aperture sharing, simple feeding structures. However, the conventional high-gain dielectric lens microwave usually are too bulky. With development metasurfaces, design has replaced by single or multiple layered planar structures such as patterned PCB boards. This paper first briefs mechanism metasurfaces in a lens. Then recently developed our team from National...