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This paper proposes new reflectarray elements for dual-polarization wideband use. These elements provide low cross polarization property and almost linear phase property for the frequency, thereby achieving the desirable reflection phase over the wide frequency range. To verify effectiveness of the proposed elements, a reflectarray with offset feed is constructed by them, and also is wideband frequency...
A novel band-reconfigurable antenna with stable unidirectional radiation patterns is presented for cognitive radio applications. One wideband mode based on a magneto-electric (ME) dipole and four narrowband modes based on a length-reconfigurable thin dipole are achieved for operation between 0.83 to 2.16 GHz. PIN diodes are used as switches for choosing different operating modes. The ME dipole technology...
This paper presents a metal cap with two slots covering the end of the module substrate for a 60-GHz wireless personal area network (WPAN). The metal cap is fed by a microstrip line (MSL). The internal structure of the metal cap is simple, consisting of only a T-junction. The thickness and the height of the cap are 1.1 mm and 3.8 mm, respectively. The bandwidth for reflection less than −10 dB is 19...
This paper proposes dielectric lens-corrected horn with a coaxial groove. For covering a wider area with keeping a high gain, this paper newly proposes dielectric lens loaded into a horn antenna for wide angle radiation for 24 GHz radar systems. It can improve the lowest gain of the desired area by optimizing both parameters of the dielectric lens and the primary horn.
For calibrating electric-field probe to evaluate the value of SAR (specific absorption rate) for devices at a frequency of 30 MHz, a shielded loop antenna is used as a reference antenna. To facilitate curve fitting for the calibration, near-field gain should be constant near the loop. In this paper, it is shown that the circumference of the loop can be selected as the near-field gain becomes approximately-constant...
In this paper, we design a dual-polarization corporate-feed waveguide 32×32-slot array antenna for 120 GHz band in order to increase the operating frequency band and the gain. As a result of the simulation by HFSS, the bandwidth for VSWR less than 1.5 at the design frequency of 125 GHz is 7.6% (S11) and 8.8% (S22), respectively. The isolation is more than 50 dB over the above bandwidth. The simulated...
This paper presents a novel broadband unidirectional circularly polarized (CP) monopole antenna. The proposed antenna, which is based on traveling wave excitation, is compact in size and simple in structure. It consists of a ground plane, a probe, and an L-shaped strip. A 4×4-element array on low temperature cofired ceramic (LTCC) for the 60 GHz band is also presented. Simulation results of the antenna...
Recently, in order to evaluate the performance of heterogeneous networks, outdoor-to-indoor propagation characteristics have been actively investigated. In this paper, we evaluate the performance of a theoretical analysis method that is a hybrid of ray-tracing and physical optics with respect to the calculation accuracy. This is the first investigation to focus specifically on the calculation part...
A new technique for estimating far-field gain as well as phase center of antennas operated in liquid is numerically demonstrated. It is easily derived that the distance characteristic of near-field gain for antennas operated in the liquid is the same as that in free space. Moreover, another expression for the nearfield gain for antennas operated in the liquid that the authors have proposed is proven...
Two different reconfigurable techniques for spectrum-monitoring antenna are presented. The first method inserts high-performance RF-MEMS switches along the microstrip feed line and back slot of a Vivaldi antenna for switching between three frequency bands centered at 2, 3.5 and 5.25 GHz. The second method collocates three different excitations in the defined space and utilise a common aperture for...
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