Jinsu Jeon

A Compact MIMO Antenna using CRLH Configuration Double-Layered Folded Ring Radiations with Planar Mushroom Decoupling Structure

This paper proposes a novel compact multiple-input-multiple-output (MIMO) antenna, which has miniaturized radiators and improved isolation, working for the long-term evolution (LTE) mobile communication. Each of the proposed radiators has a double-layered ring of the composite right- and left-handed transmission-line configuration, which has the footprint of λg/30 by λg/30, much smaller than the conventional MIMO antenna radiators. These radiators can be placed close to each other and have a planar modified mushroom structure between them for a higher isolation level. The design starts from the equivalent circuit for the LTE 1.7-GHz-band antenna, finds a physical structure suitable for the circuit, and is verified by comparing the circuit simulation with the 3-D EM simulation and measured data. The dispersion diagram shows that the zeroth-order resonance coincides with the center frequency of the band, and the fabricated antenna has the return loss less than -10 dB, the isolation over 12 dB, and the radiation efficiency over 50%.

GA-Optimized Compact Broadband CRLH Band-Pass Filter Using Stub-Inserted Interdigital Coupled Lines

The design of a new compact band-pass filter is proposed, which is based on the microstrip composite right- and left-handed transmission-line (CRLH-TL) structure. Particularly, the interdigital coupled (IDC) lines of the CRLH geometry are proposed to be parted by inserting open stubs to meet the specifications on the passband. In addition, there is another pair of stubs to complete the design in a limited space. These are considered in the TL-based analysis and the design parameters are calculated by genetic algorithm optimization. The measurement is shown to be acceptable and agreeable with the circuit and electromagnetic field simulations. In addition, the zerothorder resonance (ZOR) phenomenon is verified.

Design of a miniaturized UHF-band Zigbee antenna applicable to the M2M/IoT communication

In this paper, a miniature UHF-band Zigbee antenna is proposed. Considering a lighter weight and smaller footprint of the Zigbee platform attached to a walking person, the antenna is meandered on the top and partially short circuited on the bottom, and optimized with non-uniform widths and lengths of the radiating element, and capillary paths. Due to these contributing factors, the physical area is reduced by roughly 50% from the simple monopole antenna. Besides, the bandwidth of 20 MHz is obtained for the resonance frequency of 915 MHz, working appropriately for the UHF-band Zigbee application such as M2M and IoT. The full-wave simulation with the measurement verifies the proposed design.

Compact Dual-Band Three-Way Metamaterial Power-Divider with a Hybrid CRLH Phase-Shift Line

A compact dual-band three-way metamaterial power divider is proposed that has three in-phase outputs. Fully printed composite rightand left-handed (CRLH) unequal and equal power dividers are first implemented for 900-MHz and 2.4-GHz bands with the power-division ratios of 2:1 and 1:1, respectively. An initial 1:1:1 power divider is then achieved by incorporating the input of the two-way equal block into an output of the unequal block, and trimming the interconnection parameters. The condition of an identical phase at the three outputs of the power divider is then met by devising a hybrid CRLH phase-shift line to compensate for the different phase errors at the two frequencies. This scheme is confirmed by predicting the performance of the power divider with circuit analysis and full-wave simulation and measuring the fabricated prototype. They results show agreement; the in-phase outputs as well as the desirable power-division are accomplished and outdo the conventional techniques.

CRLH Leaky-wave beam-forming antenna with enhanced gain for the V2X communication

In this paper, a CRLH Leaky-wave two-dimensional array antenna for hemispherical beam-forming aimed at V2X communication is proposed. This antenna is composed of 4×4 feed-network and 4 rows of CRLH leaky-wave radiating structures that adopt the capacitive inter-element coupled mushrooms. Every single capacitive coupling uses 0.75 pF. We will show beam-forming and enhanced gain performances.