A planar monopole antenna with a parasitic shorted strip for multistandard handheld terminal is presented. The proposed antenna simply consists of two overlapping strips: a long strip on the front side and a parasitic shorted strip on the back side. To make the proposed antenna easy to manufacture and reduce the manufacturing cost, the entire structure is fully printed without VIA holes, the long strip monopole is directly fed, and the parasitic shorted strip is coupled-fed by the overlapped part. For lower and middle frequencies, the GSM900 and PCS bands are excited by the fundamental mode of the long strip and the parasitic shorted strip, respectively. For the upper frequency, the Wi-Fi2400/RFID2450 and LTE2300/2500 bands are provided by the third-order mode of the long strip. The detailed design of the proposed antenna and its radiation performances are studied. The proposed multiband antenna occupies a small area of 40 × 18 mm 2 on a printed circuit board (PCB). The measured results show that the proposed antenna has three impedance bands with return loss less than −6 dB: 25.6% for the low band (850-1100 MHz), 13.3% for the middle band (1750-2000 MHz) and 22.7% for the high band (2190-2750 MHz). INDEX TERMS Planar monopole antenna, parasitic shorted strip, coupled-fed, handheld terminals, multiband operation.
In this paper, circular substrate integrated waveguide (CSIW) filters are presented. Π-shape slots etched along the electric walls of the CSIW on the upper layer are proposed firstly, which enhance the magnetic coupling parameters between two CSIW cavities. Meanwhile, S-shape slots as the electric coupling structure are firstly used on CSIW filters. With both magnetic and electric coupling, the third-order and fourth-order crosscoupled bandpass filters based on circular substrate integrated waveguide resonator (CSIWR) are designed, which possess one transmission zero (TZ) and two transmission zeros, respectively. Measured results of these filters with a high selectivity agree well with simulated ones.
In this paper, a novel structure of One-Third-Mode Substrate Integrated Waveguide Resonator (OTMSIWR) is first proposed, which reduces about 65% size. Based on the OTMSIWR, a single-band bandpass filter (BPF) operats at 4.55 GHz is designed. The single-band BPF has a wide and deep upper stopband. Further, a dual-band BPF using high mode technology based on the single-band filter is designed. The fundamental mode (TM 101 mode) and high mode (TM 201 mode) are utilized to achieve the dual-band response. The center frequencies locate at the 4.2 GHz and 6.15 GHz, respectively. Two transmission zeros (TZs) are achieved in the dual-band BPF by adjusting the positions of the feeds. To further improve the selectivity of the upper stopband of the dual-band BPF, two pairs of Complementary Split-Ring Resonators (CSRRs) are introduced on the surface of the OTMSIWR, which obtain the desired results. Finally, a singleband BPF and a dual-band BPF are fabricated and tested. The measured results agreed well with the simulated ones, which proved that the proposed structure is a good candidate to design filters.
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