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Millimeter wave spectrum is the main candidate for body centric wireless applications such as health monitoring, live streaming, and gaming. In this paper, a frequency scanning microstrip antenna array is designed as it provides reconfigurability in the direction of main beam pattern. The designed antenna is an array of 16 elements with the measured impedance bandwidth from 33GHz to 40GHz. The S11...
Dealing with multiple antennas in various wireless devices has raised a distress of health effect. Thus, the investigation towards the relations between the electromagnetic field (EMF) radiation and human health is significant to be discovered. Hence, this paper presents the specific absorption rate (SAR) investigation on a single and 1 × 2 array of microstrip patch antenna operated at 0.8, 0.85,...
This paper presents design of a varactor-loaded frequency-tunable ring microstrip antenna with reduced bias circuits. Two varactor diodes are mounted on square ring patch element fed by an L-probe to realize a frequency-tunable microstrip antenna. An L-shaped feeding probe is used to realize impedance matching of the ring microstrip antenna. Resonant frequency of the proposed antenna can be tuned...
This paper proposes small CRPA arrays with high-dielectric ceramic superstrates for dual-band operation. Each array element consists of inner and outer microstrip rings printed on a high-dielectric substrate, and a hybrid chip coupler is used for quadrature excitation to achieve circular polarization. The superstrates with high relative permittivity are designed to have a cylindrical shape and are...
An array of microstrip lines is used for the direct excitation of the spatially distributed TE10 substrate integrated waveguide (SIW) mode. The proposed configuration can generate 4x more power with a 4x smaller form factor relative to a single microstrip-to-SIW transition, while offering a larger bandwidth. This is an important step toward the generation of high power in densely integrated mm-wave...
This paper proposes a new planar rectenna which provides dual-axis wide-angle reception. An in-phase/anti-phase triple-feed array antenna is employed to obtain high gain but prevent gain degradation due to main-beam misalignment. The proposed rectenna separately rectifies the in-phase and anti-phase components of the received RF waves in a simple structure by effectively using two types of magic-Ts...
This paper present the microstrip patch antenna with I-shaped mushroom like EBG structure for gain enhancement. By properly placing the electromagnetic band gap (EBG) structure around radiating patch, the gain of a conventional microstrip patch antenna is improved. In order to achieve the EBG operation for wireless local area network of U-NII 1 and 2 bands, the EBG structure is formed by using the...
Now a day's increasing demand for higher bandwidth and other benefits of millimeter waves like line of sight communication and non bending property, molecular absorption, higher antenna gain at high frequencies make millimeter wave component design a favorite area of working. This transition structure of waveguide to microstrip line is useful for integration of high frequency circuits to the waveguide...
A kind of low sidelobe and high gain microstrip antenna array with 32×8 units operating in the X-band is designed, which achieves the gain of 28 dBi and the sidelobe level of −25 dB at 9.37 GHz. The Chebeshev distribution is used in designing the current distribution on the surface of this antenna, which achieves a width of main lobe of 5° in E-plane and a main lobe width of 10° in H-plane. The amplitude...
A miniaturized independently tuning dual-band multi-mode antenna using postwall slotline (PWS) is proposed and simulated in this work. The antenna consists a stepped impedance slot and a patch on the other side of the substrate, and the patch is attached at the edge of the slot by shorting pins. The stepped impedance slot based on the postwall slotline is actually a dual-mode slotline antenna working...
This work presents a high-gain double reflectors microstrip-fed slot antenna for WLAN and WiMAX applications as the IEEE 802.11b/g and IEEE 802.11a standards. The antenna is composed of a microstrip-fed slot with a complementary stub on a single substrate and a pair of reflectors. The reflectors are exploited to achieve bi-directional radiation patterns which is suitable for using in buildings or...
This paper proposes a small CRPA array with frequency-insensitive properties. The array consists of seven elements, and each element is composed of upper and lower circular loops that are designed to resonate at 1.575 GHz and 1.227 GHz, respectively. The lower loop is fed by the hybrid chip coupler, and the upper loop is electromagnetically coupled for a frequency-insensitive feeding mechanism. Due...
In this paper, a double balanced multiplier (DBM) integrated circularly polarized microstrip antenna is investigated experimentally. The DBM is one of functional microwave circuits. The DBM is loaded in order to achieve a circularly polarized antenna with wideband and its sense switching function. Performances of the antenna due to the nonlinear characteristics of the DBM depend on the input power...
In this paper antenna on silicon is presented. This paper proposes design of micro strip antenna on silicon with improved bandwidth. Proposed antenna is for X-band frequency. To improve bandwidth, ground defect being created on silicon substrate. With this we are improve bandwidth by 4–8 times. Designed verified both in HFSS simulation tool and on VNA after fabricating device.
The design of a single layer wideband circularly polarized 2 × 2 microstrip array at X-band frequencies is described. The antenna elements are shorted annular patches and the array is driven with a sequential-phase feeding network. The array is modelled on a 1U CubeSat. The performance of the array is compared to a single element microstrip antenna.
A new circular polarization microstrip antenna having a defected ground plane is presented in this paper. A defect on the ground plane is introduced by inserting a square ring slot just below one of the top corners of the patch. The inserted slot on the ground creates a perturbation in the patch as like as conventional perturbed circular polarization antennas. The measured 3-dB axial ratio bandwidth...
This paper presents the study of rectangular dielectric resonator antennas (DRAs) with a thin graphene film placed on the top surface of the resonator. The effect of the graphene film with different conductivities on the |S11| response and antenna gain of the rectangular DRAs is investigated. Both 50% and 100% graphene film coverage cases on the top surface of the DRA are considered. In the latter...
The accuracy of the microstrip-to-waveguide transition (MWT) simulation model near 76.5 GHz is shown to increase by using the estimated loss tangent of the dielectric substrate. The loss tangent is estimated by measuring the attenuation through two microstrip lines with different lengths connected between a pair of MWT's in a back-to-back configuration. The approach is validated by comparing the simulated...
Recently, a cloaking technology using reflecting elements has been marked. Cloaking devices using reflectarray have simple and very thin structure, so they are especially suitable for cloaking. This paper proposes a carpet cloaking using wideband reflectarray.
In this paper, a power divider is proposed. The presented divider consists four varactors and two microstrip lines. The divider has four ports, port 1, port 2, port 3 and port 4. Port 1 is the input port, and port 3, 4 are output ports. Besides, port 2 is the isolated port. When the capacitance of the four varactors is 0, the power is outputted in port 4. When the capacitance of the four varactors...
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