Planar triangular monopole antenna with multioctave bandwidth

Moradi

2015

near the influential materials if the proximity effect is either an advantage or a disadvantage for an antenna system, depending on the size of an element materials, and small antenna is a small example ceramic chip antenna encapsulated in a cubic millimeters, using ESA and PSA as well. When designing a chip ceramic ESA, the dimensions of the mobile terminal device, the space for mounting the antenna, the space to be occupied by the antenna, and the antenna size [11]. FUNDAMENTAL LIMITATIONSmall antennas to reduce its size, gain and antenna efficiency degrade, and bandwidth tends to be narrower. Body limiting small antenna could have effective aperture as high as 98% of a half-wave dipole antenna when the antenna is optimally adapted to the load. There seems to be no limitation in reducing the size of the antennas, so did the antenna can be perfectly adequate. Perfect matching is impossible when an antenna is extremely low [12].Furthermore, the losses existing in the antenna structure and the corresponding circuit does not exceed the radiation resistance, which reduces the effective apertures that the efficiency of radiotherapy. With regard to the impedance of the antenna, the increase and decrease in the reactive component of the resistive elements results in a high Q factor and bandwidth will be reduced as a result. Reducing the size of the antenna and also makes them Q and bandwidth [13].The parameters affecting the fundamental limitations of small antennas are antenna Q (quality factor) of the bandwidth ratio g, the antenna size ka, where a is the radius of a sphere surrounding and antenna [14].ka is much smaller than unity. Q is proportion to ka ð Þ -3 .RBW is proportion to ka ð Þ 3 , RBW nearly equalsg is proportion ka ð Þ 4 . CONCLUSIONIn a number of applications such as wireless Personal Computer Memory Card International Association cards, ESA's have been implemented that have adequate impedance bandwidth, and they are well matched. Some case matching the impedance bandwidth would decrease or in some case increase. Such that main fundamental limitation on antennas size versus impedance bandwidth brigs order to what can appear to be mysterious changes in antenna performance [15][16][17]. It should be noted that a small antenna, that is, appropriately designed to satisfy the system requirements should not be near certain materials so that designed antenna performance is substantially harmed. It can be said generally that the smaller the antenna becomes, the large the influence of such nearby materials is likely to be. ACKNOWLEDGMENTThe authors would like to thank the management of CHARU-SAT and management of Chandubhai S Patel Institute of Technology for their continuous support and encouragement. ABSTRACT: In this letter, we present a compact dual-band dielectric resonator antenna for multi-input multi-output antenna is designed and fabricated. The proposed antenna consists of a single cylindrical dielectric resonator antenna (CDRA) excited from two orthogonal ports. The electromagnetic analysis is perfor...

Section: Antenna Designmentioning

confidence: 99%

A novel CPW‐fed antenna with dual band‐notched charectrestics for UWB applications

Sefidi

Moradi

2015

“…Therefore, UWB antenna with notched characteristics at these frequency bands is required. The conventional methods are cutting a slot (U‐shaped, arc shaped, T‐shaped slot) on the patch . Inserting a slit on the patch , another way is putting parasitic elements as filters to reject the electromagnetic interference (EMI).…”

Section: Introductionmentioning

confidence: 99%

A small CPW‐fed UWB antenna with dual band‐notched charectrestics using two stepped impedance resonators

Sefidi

Moradi

2015

In this article, we propose a compact cpw‐fed ultra‐wideband (UWB) antenna with dual band‐notched characteristics. The dual band‐notched are achieved by using two stepped impedance resonators. The measured results show that the proposed antenna has an impedance bandwidth from 2.97 to 10.7 GHz (113%), defined by VSWR<2, with two notched bands, covering all the WiMAX (3.3–3.6 GHz), WLAN (5.2–5.8 GHz), the antenna has a small size (20 × 20 × 1.6 mm3), and almost stable omnidirectional radiation pattern. The proposed antenna is designed, simulated, fabricated, and tested, and the measured results are in good agreement with the simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:464–467, 2016

“…In addition, it needs to provide omnidirectional radiation coverage over the entire UWB frequency range. Other aesthetic features sought from the antenna include being light weighted, small in size, and having a low profile .…”

Section: Introductionmentioning

confidence: 99%

“…Several monopole configurations have been investigated for wideband applications thus far, which include the various structures . Among the proposed wideband antennas include the printed planar monopole antenna, which is a promising candidate for future applications, due to its remarkably compact size, stable radiation characteristics, and ease of construction.…”

Section: Introductionmentioning

confidence: 99%

A compact modified triangular CPW‐fed antenna with multioctave bandwidth

Siahcheshm

Nourinia

et al. 2014

This article presents the results of a compact modified triangular CPW‐fed antenna that exhibits multioctave performance. This modification significantly improves the antenna's impedance bandwidth by 198% over an ultra‐wideband (UWB) frequency range from 3.06 to 35 GHz. The return‐loss (S11) performance over this frequency range is designed to be better than −10 dB. These characteristics make the proposed antenna an excellent candidate for numerous UWB applications and next generation communication systems. The key physical parameters affecting the antenna's frequency characteristics have also been investigated to determine optimum antenna performance. The antenna's measured return loss and E‐plane and H‐plane radiation patterns show a very good correlation with the requirements of UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:69–72, 2015