In this paper, a novel design method for a dual-band bandpass filter (BPF) with arbitrary controllable bandwidths based on a simple frequency mapping function is proposed and its analytical design equations are also derived. The circuit conversion techniques are employed for implementation with distributed transmission line. To validate the proposed dual-band BPF with controllable bandwidths, a...

Development of small antennas for mobile phones has received a lot of attention during the last few years due to size reduction of the handsets, requirements to keep the amount of RF power absorbed by the user below standardized levels regardless of the handset size, and introduction of multimode phones. Single-band and dual-band phones in which the external whip or helix antenna has been repla...

A novel approach to design Tunable Dual-Band Band-Stop filters will be presented in this paper. These filters have a new configuration with a coplanar microstrip line loaded with SteppedImpedance Resonators (SIRs). These can be tuned by using tuning elements such as a tuning diode and ferroelectric capacitor. The Dual-Band Band-Stop Filter (DBBSF) and Dual-Band Band-Pass Filter (DBBPF) have bec...

A novel single-layer unit cell structure is proposed to design a dual-band dual-linearpolarization reflectarray antenna with different beams for X and Ku bands. The unit cell structure is composed of a circular ring and two cross bow-tie structures combined by a circular patch. Five tunable geometric parameters can be optimized to achieve the required phase distributions of the reflectarray ant...

1. INTRODUCTION With the enormous growth of computer-based terminals, the demands for indoor network which enable us to transmit and share digital information have been rapidly increased. As a method to form indoor office/home network, wireless LAN (WLAN) systems have taking a great attention, as they provides attractive features such as an ease of network constructions, a flexibility of networ...

This paper describes the design and analysis of planar dualband bandpass filters using stepped impedance resonators. In the proposed filter configurations, dual-band bandpass filters are designed, and realized by using inverted stepped impedance (SIR) resonators. The conventional half wavelength open circuited stub single frequency resonators are replaced with dual band simple two section stepp...

A novel compact rectifier for dual-band operation in the RF energy harvesting is presented. The circuit comprises a 4th order dual-band impedance matching and a single-series circuit with one double diode, both are integrating into a compact shape to occupy a small area of 30 × 35 mm. The merit of the proposed rectifier circuit is that it can be extended to n number of the frequency band by usi...

In this work, we present a dual-band band-pass filter with fixed low-band resonant frequency and tunable high-band resonant frequency. The proposed filter consists of two split-ring resonators (SRRs) with a stub and microfluidic channels. The lower resonant frequency is determined by the length of the SRR alone, whereas the higher resonant frequency is determined by the lengths of the SRR and t...

We propose a photonic method to generate and transmit dual-band dual-chirp microwave waveforms based on dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM). The key novelty of this work is the generation with flexible central frequency relationship meet requirement radar system, transmission generated elimination power fading. In proposed method, are by applying two different RF s...

Wave concept iterative procedure (WCIP) is used to analyze dual-band and enhanced band frequency selective surfaces (FSS). In the metallic U-shaped simple FSS, a fine-tune of the two rejected bands is insured by varying independently the length of the two parallel U-shaped FSS strips. The dual band response can also be obtained from the two-level rectangular conducting patches FSS. An enhanced ...