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Miniaturized frequency selective surfaces (FSSs) have been intensively investigated because of the space limitation in practical applications, such as wireless communication system working at low frequencies. Loading lumped capacitor is an effective miniaturization method to achieve the unit cell size as compact as λ0/15 (λ0 refers to the resonant wavelength in free space) [1, 2]. But this approach...
Terahertz detectors for astronomical observations such as continuum radiation are required to have a well-defined bandpass, which is typically about 10% of the detector's center frequency. Two cavity bandpass filters with quasi-elliptic response at 220 GHz are therefore analyzed in this paper. A dual-mode cavity bandpass filter is firstly analyzed, showing a limited relative bandwidth of 5.7%. To...
A symmetrical semi-ring polarization converter based on slotted frequency selective surface (SFSS) is presented in this paper. The proposed SFSS is a free metallic screen without supported media, and the corresponding formulas are provided to calculate its frequency response. Good agreements can be observed between the simulated and calculated results. The phase difference between TE and TM components...
A compact ultra-wideband (UWB) bandpass filter with an inherent notched band and steep slopes has been presented and implemented with the low temperature cofired ceramic technology. The filter is realized by a stepped-impedance T-shaped resonator (SITR) coupled to a pair of quarter-wavelength input/output feed-lines. The proposed SITR can facilitate not only a notched band, but also sharp roll-off...
A Fabry-Perot (F-P) antenna with conical beam is presented. Cavity structure with a cross-slot FSS superstrate is designed resonant at a prescribed flare angle and a specified defect frequency by combining leaky wave and EBG antenna theory. By using a circular patch as the primary source, the aperture distribution can be controlled with appropriate mode to achieve desirable gain and side lobe level...
Modeling of resonant detection of terahertz (THz) radiation of Metal-Oxide-Semiconductor (MOS) field effect transistors (FETs) under the optical beating mode is studied in this paper. An analytical model is first proposed which covers all operation regions of FETs from sub-threshold to the strong inversion, and then is verified by the numerical tool which has been improved to simulate THz detection...
A novel miniature microstrip dual-mode filter with coupling between source and load is designed and fabricated in this paper. The coupling and routing scheme is presented to model the operation of this filter. The new filter reduces the occupied area up to 34% compared with the conventional one at 2.4 GHz. Meanwhile, the proposed filter has second harmonic suppression performance. It is validated...
A novel millimeter wave (MMW) frequency selective surface (FSS) is proposed. The periodic elements of FSS are etched on a layer of semiconductor film. The film is transparent at infrared (IR) wavelength and periodic elements are designed to decrease the transmission loss due to the finite conductivity of the film at millimeter wavelength. An FSS with the resonant frequency at 35 GHz is designed. Simulated...
Compact open-loop resonators loaded by open stubs are used to design cross-coupled filters with a dual-passband response of Chebyshev function. The second passband of the proposed filter is obtained by tuning higher resonant modes of the open-loop resonator by changing the stub length and position. Proper couplings required for the two desired/designed frequencies are obtained by tuning the relative...
A novel dualband miniaturized bandpass loaded frequency selective surface (FSS) using substrate integrated waveguide technique (SIW) is presented. By loading surface mount capacitors, the size of the FSS is reduced to 6.6% compared with the resonance wavelength. By loading different lumped elements, closing band spacing can be easily achieved. The undesired coupling between LFSS unit cells is eliminated...
In this paper, the new dual frequency DGS unit cell and its equivalent circuit model have been proposed. Model parameters extracting process was detailed and has been demonstrated its validity by experiment circuits. A significant improvement in effective capacitances is also illustrated. According to dual frequency DGS characteristics discussed in this paper, this newly proposed structure can be...
In this paper, a novel single-layer miniaturized loaded frequency selective surface (FSS) with enhanced bandwidth operating over the GPS and DCS 1800 frequency band is presented, in which each periodic cell consists of double square loops with different capacitive loadings. To eliminate the undesired coupling between unit cells, the unit cells are placed in the substrate integrated waveguide (SIW)...
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