This paper presents a compact printed Dual-Band Dual-polarized slot antenna. The antenna is comprised of three main sections: coupled-fed, two cells of complementary capacitively-loaded loop-inspired metamaterial (CCLL-MTMs), and a slot with an overall size of 29. 4×39. 2 mm2. It is shown that the CCLL-MTM structure exhibits a magneto-dielectric behavior with an effective lowfrequency epsilon-negative (ENG) medium. The effective ENG material leads to a miniature printed slot antenna and a low-frequency Band of 1900 MHz has been achieved. At the higher frequencies, it behaves as a magnetic material, which helps to match the antenna through a broadBand frequency range. An operating Band of 4750 to 5730 MHz is observed. The electric field of resonating CCLLMTM cells and the original slot are perpendiculars, thus each Band supports only a single horizontal/vertical polarization. In order to validate the simulation results, a prototype of the antenna is fabricated and tested. Good agreement between the simulation and measurement results is obtained.

In this paper, a Band-pass filter with suitable performance for wireless telecommunication applications is designed and fabricated. For designing the proposed filter, the dimensions of Dual-mode square patch resonator are chosen to be within a quarter of the wavelength. Circular perturbations (circular slots) are used for better performance of the proposed filter. A Dual channel filter is designed and fabricated on an FR4 substrate. The center frequency of the proposed filter for the first channel is equal to 2. 35 GHz and for the second channel is equal to 3. 375 GHz; the 3-dB fractional Bandwidths (FBWs) of 12. 75 and 10. 3 %, respectively. The measured insertion losses are 0. 8 and 1. 45 dB, respectively. The proposed filter has a small size of 20 mm × 20mm. The group delay of the proposed filter for the first and second pass Bands is almost constant, which indicates phase of the insertion loss in the pass Bands is linear. The proposed filter is fabricated and tested. The results of simulation are fairly consistent with that of the measurement. The proposed filter can be used in wireless communications and modern microwave telecommunication.

In this paper, one of the applications of MEMS technology in the field of telecommunication systems is introduced. For the first time, by using a variable MEMS capacitor in the CSRR resonator, a new method for adjusting and multi-Banding telecommunication resonators is provided independently and simultaneously. In addition, the CSRR resonator is implemented on a HMSIW line and fabricated with the integrated circuit fabrication technology in order to reduce the noise caused by incomplete connection as well as area and loss and to integrate with the MEMS structure. Also, in this paper, the frequency behavior of structures was investigated by magnetic simulation with HFSS software. The results indicate that the transmission loss of the proposed structures is less than 1 dB and the return loss is greater than 15 dB. The proposed resonator works in the S-Band frequency with the same frequency behavior as PCB board while its area is reduced by five times compared to the conventional structure by choosing the appropriate substrate for the integration. The proposed fabrication process for the adjustable and Dual-Band structure is presented which is based on existing integrated circuit technology.

Infrared imagers are important for reorganization and monitoring. This paper discusses the design of an infrared imager. Optical design in medium wavelength infrared (MWIR) and long wavelength infrared (LWIR) Bands is different and needs distinct detectors and materials. Reflective systems are not suitable due to their small field of view (FOV) and vignetting. Refractive Dual Band optical system has been designed with considering both regions assessment and each Band detector specifications.

Body Centric Wireless Communication (BCWC) has been topic of much research in recent years. In this manuscript, a novel low-cost microstrip patch antenna is designed for on-/off-body communication with a Dual-Band operation. The proposed structure exhibits a monopole-like radiation pattern at 2. 45 GHz and a broadside radiation at 4. 8 GHz, simultaneously. Lateral dimensions of 42 mm × 46 mm and a low profile foam substrate with thickness of 2. 5 mm are considered for the Dual-mode antenna presented. The proposed low-cost structure is fabricated and the stability of its performance under the human body effects is investigated through both simulation and measurement. The experimental results are in good agreement with the simulated ones.

In this paper, a new design of concurrent Dual-Band Low Noise Amplifier (LNA) for multi-Band single-channel Global Navigation Satellite System (GNSS) receivers is proposed. This new structure is able to operate concurrently at frequency of 1.2 and 1.57 GHz. Parallel and series resonance parts are employed in the input matching in order to achieve concurrent performance. With respect to used pseudo-differential structure, LNA is basically a single-ended-to-differential conversion and it consequently has no need to balun. In addition, an inductively degenerated cascode approach is employed to have better simultaneous matching and Noise Figure (NF). Simulations are performed with TSMC 0.18μm technology in ADS software. Results analysis present that LNA achieves input matchings of -11.024 and -13.131 dB, NFs of 2.315 and 2.333 dB, gains of 26.926 and 27.576 dB, P-1dB of -15.3 and -13 dBm, IIP3 of -0.9 and 2.2 dBm at 1.2 and 1.57 GHz, respectively. Besides, LNA consumes 8.32 mA DC current from a 1.8 V supply voltage.

In this paper, a frequency switchable antenna design using genetic algorithms (GAs) for Dual Band WiMAX (3.5GHz) and WLAN (5.2GHz) applications is proposed. The area of the radiating patch element is divided into 2 mm square cells, with each cell assigned a conducting or non-conducting characteristic. To realize frequency reconfiguration, switches are incorporated into appropriate locations to activate/deactivate corresponding cells. The on/off states of the switches are represented by the presence or absence of conductor, respectively. Hence, the proposed approach allows the antenna to operate as mono-Band or Dual-Band radiator according to the desired application. Further, measurements and simulations are carried out and a reasonable agreement is achieved.

In this article, a very small flexible antenna with Dual-Band rejection specifications is proposed for operating in both wearable and ultra-wideBand (UWB) applications. The overall size of this antenna is about 18×18×0.508 mm3 and by etching out two rectangular slot type single split-ring resonators (SRRs) of different dimensions from the radiating patch, Dual Band-notched specifications are obtained in WiMAX (3.3 GHz to 3.7 GHz) and WLAN (5.15 GHz to 5.825 GHz) wireless communication Bands. The designed antenna operates over a wide impedance Bandwidth (|S11| < –10 dB) from 2.1 GHz to 12 GHz which can cover the whole UWB Band from 3.1 GHz to 10.6 GHz and reject the two mentioned Bands. An asymmetrical partial ground plane and a beveled radiating patch are utilized to achieve 140% fractional Bandwidth. Also, due to the good wearable radiation characteristics, this antenna can operate in industrial scientific medical (ISM) Band from 2.4 GHz to 2.5 GHz. Meanwhile, the specific absorption ratio (SAR) value of the proposed antenna is less than the standard limit of 1.6 W/kg.