Chih-Hao Lin

Bio: Chih-Hao Lin is an academic researcher from HTC. The author has contributed to research in topics: Folded inverted conformal antenna & Microstrip antenna. The author has an hindex of 2, co-authored 3 publications receiving 65 citations.

Simple Printed Multiband Antenna With Novel Parasitic-Element Design for Multistandard Mobile Phone Applications

Abstract: A simple printed multiband antenna with parasitic-element design for multi-standard handheld terminals in mobile communications is presented. The proposed antenna performs three resonance modes covering six bands of wireless standards, including GSM, GPS, DCS, PCS, UMTS, and LTE 2300/2500. In geometry, the antenna simply consists of two metal stubs. One is an L-shaped driven stub working as a feeder and an embedded transmission line. The other is a U-shaped parasitic stub working as a radiator. With fully printed and simple configuration, the proposed antenna design is cost effective in manufacturing and easy to optimize for different frequency bands. Parametric studies and the design rule are included. The antenna occupies an area of 18 × 37 mm2 on top of a system board. This communication covers the details of the antenna design, working principle, and the performances of simulation and measurement.

A planar multiband antenna with parasitic-element design for multistandard mobile terminals

Abstract: In conclusion, a novel planar PCB multiband antenna with parasitic element is proposed in this paper. Using only two simple radiating elements, the antenna operates with three separate resonant modes, covering six popular communication bands. The antenna area only occupies a small physical space (18 × 37 × 0.6 mm3). This simple planar PCB structure makes the antenna fabrication very cost effective. The proposed antenna performs a stable gain level and omni-directional patterns in the desired bands.

Dual-band planar monopole antenna using grounded parasitic coupling

Abstract: In this paper, we present a new design of dual-band planar monopole antenna with a symmetric shorted quarter-wavelength resonator. The antenna consists of two elements in order to achieve dual-band operation: one is a stacked T-shaped monopole for the higher band operation, and the other is the grounded parasitic resonator for lower band operation. The antenna is featured by its compact size, simple structure, and low cost to fabricate.

A Dielectric Resonator-Loaded Minkowski Fractal-Shaped Slot Loop Heptaband Antenna

Abstract: A multiband fractal co-planar waveguide (CPW)-fed slot antenna loaded with a dielectric resonator conforming to multiple wireless standards is presented in this paper. The Minkowski fractal geometry is utilized to generate multiple frequency bands as well as to provide a miniaturized design compared to its Euclidean counterpart. The idea behind placing the dielectric load is to serve a dual purpose of enhancing the impedance bandwidth of the antenna at the upper frequency band as well as improving the overall gain of the antenna. The slot loop acts as a hybrid antenna performing the task of both an antenna as well as a feed mechanism for the dielectric slab to radiate. Design guidelines involving closed form formulae and equivalent model consisting of lumped resonators, distributed resonators and impedance transformers of the dielectric-loaded fractal slot antenna are provided to present an insight into the functioning of the antenna. The reflection coefficient parameters of the antenna yield a close match between the circuit model and those obtained from full wave simulator. The proposed antenna exhibits a heptaband performance with a maximum gain of 3.1 dBi.

Low-Profile Narrow-Frame Antenna for Seven-Band WWAN/LTE Smartphone Applications

Abstract: A small-size low-profile narrow-frame antenna for seven-band WWAN/LTE operations in the internal smartphone applications is proposed. The greatest highlight of this proposed antenna is that its narrow edge has a width of only 5 mm, which is very novel for smartphone applications. Meanwhile, the proposed narrow-frame antenna has a small size of 5 × 40 mm2 and a low profile of 3 mm above the circuit board, which makes it very promising for slim smartphone applications. The proposed antenna is capable of covering GSM850/900/DCS/PCS/UMTS 2100/LTE2300/2500 operating bands. Detailed design considerations of the proposed antenna are described, and both experimental and simulation results are also presented and discussed.

Compact Frequency Reconfigurable Antenna for LTE/WWAN Mobile Handset Applications

Abstract: In this communication, a compact frequency reconfigurable antenna for LTE/WWAN mobile handset applications is proposed The proposed antenna mainly consists of radiating elements and two PIN diodes In addition, the antenna has a simple structure with a compact size of ${365} \times {10}\;\text{mm}^{2}$ This antenna operates in six modes, and each mode is given a different resonant pathway by adjusting the bias states of two PIN diodes When PIN diodes #1 and #2 are in the on and off states, respectively, the proposed antenna can cover the LTE700 (698–787 MHz) band by operating in mode 1 Moreover, the wide bandwidth in a higher band formed by combining modes 2 and 3 can cover the LTE2300 (2305–2400 MHz) and LTE2500 (2500–2690 MHz) bands When PIN diodes #1 and #2 are in the off and on states, respectively, a resonant frequency in the lower band is formed by integrating modes 4 and 5 This can cover the GSM850 (824–894 MHz) and GSM900 (880–960 MHz) bands When the two PIN diodes are in the on state, the proposed antenna can cover the GSM1800 (1710–1880 MHz), GSM1900 (1850–1990 MHz), and UMTS (1920–2170 MHz) bands in operating mode 6

Design of a Multiband Antenna for LTE/GSM/UMTS Band Operation

Abstract: This paper proposes a multiband antenna for LTE/GSM/UMTS band operation. The proposed antenna consists of a meandered planar inverted-F antenna with an additional branch line for wide bandwidth and a folded-loop antenna. The antenna provides a wide bandwidth to cover the hepta-band LTE/GSM/UMTS operation. The measured 6 dB return loss bandwidth is 169 MHz (793–962 MHz) at the low-frequency band and 1030 MHz (1700–2730 MHz) at the high-frequency band. The overall dimension of the proposed antenna is 55 mm × 110 mm × 5 mm.

A miniaturized slotted multiband antenna for wireless applications

Abstract: A novel miniaturized slotted multiband antenna is presented in this article. The antenna consists of a kite-shaped slot in the radiating patch to obtain miniaturization, C- and G-shaped slots in the ground plane to incorporate multiband operation and a microstrip feedline to obtain an impedance matching. The aforementioned miniaturization method results in about 50% reduction in active patch area and about 36% reduction in volume of the proposed design, as compared to the conventional antenna. G-shaped slot is used to obtain operations at 3.6 and 5.8 GHz, while C-Shaped slot is used to obtain operations at 6.9 and 9.5 GHz. The antenna has an active patch area of only 384 $$\hbox {mm}^{2} (24\times 16\,\hbox {mm}^{2})$$ , and the entire performance analysis of the antenna are carried out using HFSS v.13.0 simulation software. The proposed design operates at about 3.58 (WiMAX), 5.9 (WLAN), 6.72 (Satellite TV), 8.51 and 9.76 GHz (X-band) with $${S}_{11}<-\,10\,\hbox {dB}$$ bandwidth of about 1.95% (3.54–3.61 GHz), 3.5% (5.88–6.09 GHz), 1.7% (6.68–6.80 GHz), 4.4% (8.36–8.74 GHz) and 3.96% (9.4–9.78 GHz), respectively. The proposed structure is compact in size, simple in construction, low profile, easy to fabricate, exhibits good impedance matching, moderate gain and stable radiation characteristics across the operational bandwidths.