Abstract
This letter presents a new thin substrate‐integrated waveguide with twisted integrated–digitated capacitor‐based corrugations that offers a transmission loss < 0.55 dB. The presented ...waveguide operates at TE
10
mode and is used to present a wideband beam‐scanning leaky‐wave antenna with an array of dumbbell‐shaped slots. The antenna is shown to operate at a frequency band of 25–37 GHz and offers a gain > 13 dBi throughout the frequency band. It has a frequency‐dependent beam‐scanning capability of 6 deg/GHz. The proposed antenna being thin is extremely conformal and is suitable for applications in millimetre‐wave off‐body communication.
In this paper, we present an extremely compact ultrawideband (UWB) monopole microstrip patch antenna for a wireless body area network (WBAN). The proposed antenna is fabricated on a flexible Rogers ...RT-5880 dielectric substrate of thickness 0.5 mm and has an overall size of 20×15×0.5 mm3. The proposed antenna achieves a wideband characteristic with the help of a modified ground plane with a monopole pair. The monopole antenna is fed through a microstrip line and has a good impedance matching over a frequency band of 3.2 to 15 GHz (and beyond), with an axial ratio below 3 dB and a high efficiency of 77–95%. This antenna is designed to cover almost the complete UWB range; bandwidth for antenna is 11.52 GHz (3.48-15 GHz). The antenna has a realized gain of 2.3–7.2 dBi throughout the frequency band and has been tested for conformality. Measured results are found to be in good correlation with the simulated results. The antenna has also been tested for specific absorption rate (SAR) values within the simulation to compare with Federal Communications Commission (FCC) limits and verify their suitability for the Internet of Things- (IoT-) based wearable body area network.
The Planar microwave antennas with simultaneously selectively narrowband and wideband resonance characteristics are essential for the diversity applications. The paper presents modeling, fabrication ...and experimental verification of a coplanar waveguide excited antenna with a complementary patch which exhibits a narrow-band resonance at 2.47 GHz, and a wideband resonance between 5.52 and 11 GHz. A reconfigurability in the antenna design was achieved by placing a PIN diode across the slot position, and the wideband resonance was switched to the narrowband resonance with a center frequency of 9.56 GHz. The device was fabricated on a foam-based substrate of relative permittivity
ε
r
= 2.2 and loss factor
tanδ
= 0.007. The tested antenna shows a comparable matching with the simulated results and a superior performance over the other reported reconfigurable CPW antennas was achieved.
in this paper, a compact H-shaped slot antenna is proposed. The antenna contains one H-shape slot which is fed through microstrip line, an open circuited stub is connected for proper impedance ...matching. The H- shaped slot is used for bandwidth enhancement. The antenna is designed to radiate at 5.4 GHz with a bandwidth of 1.6GHz. The antenna has an omni-directional pattern across the frequency band. The gain of the antenna is 4.35dBi at 5.4GHz. Since, the proposed antenna satisfies all the characteristics of energy harvesting systems, it can be used for energy harvesting systems, at 5.4GHz 4G-LTE band. CST microwave studio was used for designing the proposed antenna. An excellent agreement is achieved between simulated and measured results.
Antennas for off-body wearable applications needs to be flexible and its electrical characteristics should be stable in different body postures, different bending or stretching environments. ...Therefore, the designed antenna should be such that, even if the antenna is bent frequently, it should operate properly. In this paper, a conformal UWB antenna is reported which has been optimized to be conformal to any body shape and size. The proposed antenna has been designed on RT Duroid substrate with dielectric constant of 2.2 and loss tangent 0.0009. The thickness of the material is 0.127 mm. Due to low thickness; it can easily be bent and mounted on curved surfaces. The size of the antenna is 35 × 31 mm2. To accomplish the design process, two different bending radii have been considered to bend the proposed antenna. The two bending radii of 25 mm and 50 mm have been chosen; one corresponding to the arm of a healthy child of around 5 years age and another corresponding to a healthy person of age about 35 years with medium built. The simulated radiation efficiency and total antenna efficiency are more than 60% for the bending at 25 mm and 50 mm radii in the UWB frequency range from 3.1 GHz to 10.6 GHz. The gain of the proposed antenna for both the bending radii is changing from 1.4 dB to 5.3 dB. The return loss of the proposed antenna is obtained for 25 mm and 50 mm bending radii of curvatures and it is below 10 dB in UWB range. A prototype of proposed antenna has been fabricated and tested on Rohde & Schwarz 40 GHz VNA. Measured results are in close agreement with simulation results.
Design of a four band i.e. multiband slot antenna incorporating Global Positioning System, Wireless Local Area Networks (for IEEE 802.11 b&g and IEEE 802.11a) and Worldwide Interoperability for ...Microwave Access is presented in this paper. The antenna is designed for frequency of 1.57GHz for GPS, 2.5GHz for IEEE 802.11 b&g WLAN, 3.5GHz for WiMAX and 5.3GHz for IEEE 802.11a WLAN system. The antenna configuration comprises of a rectangular slot with triangular cuts at the corners to achieve impedance matching. It is designed and simulated using CST Studio Suite. The simulated antenna is fabricated on the economical substrate i.e FR-4 using standard photolithography process and tested in vector network analyzer (Anritsu- MS2027C). The designed antenna shows exceptional results in terms of return loss, voltage standing wave ration (VSWR), radiation pattern and bandwidth. Results conclude that the designed antenna is well suited for various applications as mentioned.
Flexible antennas are chosen based on their substrates material, antenna efficiency and production techniques. Numerous design improvements, novel materials and material characteristics, innovative ...production processes are available. Here are the few thrusting domain of flexible antenna with small size like Smart gadgets, IoT frameworks, healthcare equipments, customized medication platforms, 5G innovation, wireless sensors and communications equipment etc. The current review emphasizes the importance of flexible antennas, the substances that will use to make them flexible, several mechanical properties that affect antenna parameters, and specific biosensing with engineering considerations. The paper will centre on the intrinsic problems, prospect and potential of flexible antennas after a thorough discussion of the above-mentioned subjects. Finally, a discussion on the use of flexible antennas in future wireless technologies is presented.
A compact triangular extended radiator antenna of size 30\text{mm}^{\ast}30\text{mm} with partial ground is designed for radio location, maritime navigation as well as fixed satellite and mobile ...communication applications. A single patch antenna exhibits 10dB bandwidth from 2.87 GHz to 3.42GHz and 5.89 GHz to 6.79GHz. The compact patch antenna is designed on low cost and easily available flame retardant substrate and simple design enables easy fabrication.
In today's scenario, it has been seen worldwide that in the developing countries including India, major cause of mortality is cancer and particularly, breast cancer. Itis being the most registered ...female melanoma. In this paper, a brief review of various reported methods and systems have been represented, which are used for early breast cancer detection. Also, variety of approaches being adapted to the microwave imaging method like microwave tomography and radar-based imaging reported earlier have been rigorously studied and represented. Some recently reported articles on Microwave breast imaging sensors with required characteristics for early breast cancer detection have also been surveyed and presented to suggest the best possible method or system.
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