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Through silicon vias (TSVs) are arranged to form a rectangular resonant cavity to improve performance of silicon based antenna in this paper. On the basis of fundamental theory of rectangular resonant cavity, the model of cavity made of through silicon vias is analyzed. Considering the size of millimeter-wave antenna, the three dimensions of cavity for mode TE101 is calculated. Applying the resonant...
A compact log periodic antenna (LPDA) is presented in this paper. In this paper, a slotted second iteration of LPDA is demonstrated for size reduction that used for UHF digital TV band application. The proposed antenna operates from 0.5GHz to 1.5GHz for the reflection coefficient ≤ −10dB and maintain the gain of more than 5dBi. The antenna is designed on FR4 Epoxy dielectric substrate with the thickness...
We report the intermediate results on a novel slotted waveguide antenna for point-to-point communications at Ka band. The antenna adopts an aperiodic layout with uniformly-excited elements capable of meeting the ETSI class II radiation pattern envelop in all planes with high aperture efficiency. A total of 16 regular waveguide subarrays with an aperiodic inter-column spacing along the E-plane are...
Authors have proposed a printed inverted-F antenna (PIFA) for circular polarization. In this paper, an approach to improve the bandwidth is investigated. It is shown that the bandwidth can be widened by designing the rectangular element loaded at the feeding line as short as possible. The redesigned PIFA in this paper has approximately twice (210MHz) the bandwidth of the 3dB-axial ratio with a 10dB-return...
This paper proposes a compact circularly-polarized (CP) Substrate Integrated Waveguide (SIW) cavity antenna for 5G application operating in 28 GHz band. The antenna consists of a patch with perpendicular-arrows-shaped on a SIW structure. Longitudinal slot etched on the SIW top metallic surface are also used to excite the radiator. The CP radiation is obtained by using a three-quarters-circle-shape...
This paper presents a very simple bidirectional ultra-broadband antenna, which comprises a cylindrical ring, a disc surface probe, and a superellipse slot. The proposed antenna covers many world-famous frequency bands: GSM, UMTS, LTE, WLAN, WiMAX and UWB. In the design, numerical simulations are performed using the method of moments (MoM) with RWG basis function. The ultra-broad bandwidth is approximately...
Folded reflectarray antennas can provide a good solution for millimeter-wave systems requiring compact, low-cost antennas, e.g. in automotive applications. A rectangular patch with diagonal slots in the edges is investigated and found to present a phase angle range of more than 460° due to the two resonances. The novel antenna achieves higher gain and better performance, compared to a reflectarray...
This paper proposes a novel dual-band dual-sense circularly polarized (CP) annular ring slot antenna. The antenna consists of two concentric annular ring slots to achieve dual-band operation. The dual-sense circular polarization can be obtained by loading proper lumped capacitors across the inner and outer slots at +45° and −45°, respectively, with respect to the microstrip feed line. An antenna prototype...
In this paper, a novel technique to design a band-notched UWB antenna by using Barium Strontium Titante (BST) is proposed. A printed slot UWB antenna with size of 16 mm× 27 mm is adopted as a basic antenna. A piece of cylindrical BST slab with 1 mm height and 2.4 mm diameter is attached on the feeding layer of the antenna to achieve band-notched characteristics. The simulated −10 dB bandwidth of the...
In this paper, we proposed a novel mobile phone antenna with yttrium iron garnet (YIG) ferrite slab loaded to enhance antenna bandwidth. The antenna has an inverted-L shaped slot etched on the ground plane. The slot is fed by means of a 50 Ω microstrip connected to a bent strip. A step-shaped YIG ferrite slab is attached on the ground plane in the slot region to enhance bandwidth. The measured −6...
A compact, low-cost, dual-band circularly polarized (CP) microstrip antenna with single-feed operating at both 1555 MHz and 2500 MHz bands is designed in this paper. The circular patch of the antenna is slotted with four complementary spiral grooves for dual-band radiation. The bandwidths of |S11|<−10dB of the antenna are 42 MHz centered at 1555 MHz and 25 MHz centered at 2500 MHz, respectively...
For aperture sizes greater than 0.25λ the Vivaldi antenna design and implementation is quite easy. Criticality sets in, if the aperture size is less than 0.25λ. Keeping this aspect in view, in this paper, parametric studies have been carried out on a Vivaldi antenna with a novel taper with exponential plus sinusoidal function. For matching at the lower frequency end, a novel additional circular cavity...
This paper presents an interesting feature of the resonant slotted-waveguide antenna array: the difference pattern at off-center frequencies. Our demonstration uses a 12-element center-fed resonant slot array on rectangular waveguide. The simulation results show that the array produces a sum beam pattern at center frequency, and difference beam patterns at two off-center frequencies (around ±8%)....
In this paper, a coplanar waveguide (CPW) fed wide bandwidth T-shaped slot antenna with dual band-notched characteristics is proposed for Ultra-wideband (UWB) applications. The dual band-notches in WIMAX(3.3–3.7GHz) and WLAN(5.15–5.825GHz) applications have been realized by etching an inverted U-slot resonator inside open circuited feeding stub as well as symmetrically placed a pair of straight slit...
In this paper, a development of aperture coupled based microstrip antenna using meander line slot is presented. The proposed antenna constitutes of 2 substrate layers which are separated by a common ground plane. A Meander line slot is loaded to the antenna patch to reduce the dimension of the proposed antenna design. The antenna characteristics before and after applying a meander line slot are numerically...
This paper presents the design of the small size broadband patch antenna for L-band applications. The size reduction is obtaining without changing frequency thanks to etched six slots in antenna ground plane. The comparison between the conventional and the designed antennas demonstrates that the etched slots in the ground plane increases the bandwidth by a factor of 2.3 and reduces the antenna size...
A new Ultra-Wideband Antenna with notched band performance for WiMAX is proposed. The antenna has an extended impedance bandwidth from 3 up to 12GHz (120%). The band-notched can be controlled by adjusting the length of the rectangle slot. In order to obtain Omni-directional wide bandwidth antenna with uniform radiation pattern, rounded corners ground plane with two L-shaped slots are utilized to the...
This paper proposes a high-gain mechanically reconfigurable antenna array based on a ring-shaped slotted-waveguide antenna for mm-wave applications. A full scanning range in the azimuthal plane is ensured by proper mechanically rotating a metallic jacket, which partially covers the array radiating structure. The technique provides a beamwidth of 37° in the azimuth plane and gain of 17.41 dBi at the...
This work reports the development of antennas and antenna arrays for the future 5G cellular networks, which have been realized at the Brazilian Institute of Telecommunications (Inatel) in the last four years. Diverse reconfigurable antenna types based on printed and milled structures have been designed, fabricated and proper characterized from microwaves to mm-waves, with the aim of fulfilling the...
Ku band shaped pattern fan beam high gain spaced-borne slotted waveguide array is optimized and analyzed. The total array is composed by 16 partitions. Half height waveguides are used to reduce the slotted waveguide array weight. The waveguide wall thickness, coupling among the slots, circle end slots and other factors are all taken into account during the design process. The total array is fastened...
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