# US 10,122,399 B2 · Antenna ground and feed swapping in handheld applications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,399 B2 - Document ID: US10122399B2 - Status: Granted - Kind: B2 - Application number: 15/051,880 - Filed: 2016-02-24 - Published: 2016-06-16 - Granted: 2018-11-06 - Earliest claimed: 2015-03-10 - Assignees: Mediatek Inc. - Applicants: MediaTek Inc. - Inventors: Chen-Fang Tai - Web page: https://patentgrep.com/patent/US10122399B2 ## CPC - H04B 1/3838: {Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use} - H01Q 1/245: {with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure} - H01Q 5/50: Feeding or matching arrangements for broad-band or multi-band operation - H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength - H04B: TRANSMISSION - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract Examples of techniques for antenna ground and feed swapping in handheld applications are described. A condition with respect to wireless communication of a handheld apparatus having one or more antennas may be detected in determining whether to operate the handheld apparatus in a first mode or a second mode of wireless communication. In response to a determination to operate the handheld apparatus in the first mode, a first feeding port and one or more first shorting ports may be electrically connected to at least one antenna of the one or more antennas each disposed adjacent a first distal end of the handheld apparatus. Alternatively, in response to a determination to operate the handheld apparatus in the second mode, a second feeding port and one or more second shorting ports may be electrically connected to at least one antenna or another antenna of the one or more antennas. ## Claims ### Claim 1 A method, comprising: detecting a condition with respect to wireless communication of a handheld apparatus having one or more antennas to determine whether to operate the handheld apparatus in a first mode of wireless communication or in a second mode of wireless communication; in response to a determination to operate the handheld apparatus in the first mode, electrically connecting a first feeding port and one or more first shorting ports to at least one antenna of the one or more antennas each disposed adjacent a first distal end of the handheld apparatus; and in response to a determination to operate the handheld apparatus in the second mode, electrically connecting a second feeding port and one or more second shorting ports to the at least one antenna or another antenna of the one or more antennas, wherein each of the first feeding port, the second feeding port, the one or more first shorting ports, and the one or more second shorting ports is adjacent the first distal end of the handheld apparatus, wherein the at least one antenna has a symmetric antenna structure with a first slot toward a first side of the handheld apparatus and a second slot toward a second side of the handheld apparatus opposite the first side thereof, wherein the first slot is associated with the first feeding port and the one or more first shorting ports such that the first slot, the first feeding port and the one or more first shorting ports are utilized in the first mode, and wherein the second slot is associated with the second feeding port and the one or more second shorting ports such that the second slot, the second feeding port and the one or more second shorting ports are utilized in the second mode. ### Claim 2 (depends on 1) The method of claim 1, wherein, in the first mode of wireless communication, the one or more antennas wirelessly transmit and receive with a first radiation pattern, and wherein, in the second mode of wireless communication, the one or more antennas wirelessly transmit and receive with a second radiation pattern different from the first radiation pattern. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving wireless signals through an auxiliary antenna to supplement wireless receiving by the one or more antennas in each of the first mode and the second mode of wireless communication, wherein the auxiliary antenna is disposed adjacent a second distal end of the handheld apparatus opposite the first distal end thereof. ### Claim 4 (depends on 1) The method of claim 1, wherein a distance between the first feeding port and a first side of the handheld apparatus is less than a distance between the second feeding port and the first side of the handheld apparatus, wherein a distance between the second feeding port and a second side of the handheld apparatus is less than a distance between the first feeding port and the second side of the handheld apparatus, and wherein the first side and the second side of the handheld apparatus are opposite to each other. ### Claim 5 (depends on 4) The method of claim 4, wherein a distance between the one or more first shorting ports and the first side of the handheld apparatus is less than a distance between the one or more second shorting ports and the first side of the handheld apparatus, and wherein a distance between the one or more second shorting ports and the second side of the handheld apparatus is less than a distance between the one or more first shorting ports and the second side of the handheld apparatus. ### Claim 6 (depends on 1) The method of claim 1, wherein the one or more antennas comprise a cross-polarized log-periodic dipole (CLPD) antenna. ### Claim 7 (depends on 1) The method of claim 1, wherein the first feeding port and the one or more first shorting ports are associated with a first antenna of the one or more antennas, and wherein the second feeding port and the one or more second shorting ports are associated with a second antenna of the one or more antennas. ### Claim 8 (depends on 1) The method of claim 1, wherein the first feeding port and the one or more second shorting ports are associated with a first antenna of the one or more antennas, and wherein the second feeding port and the one or more first shorting ports are associated with a second antenna of the one or more antennas. ### Claim 9 (depends on 1) The method of claim 1, wherein the detecting of the condition with respect to wireless communication of the handheld apparatus having one or more antennas to determine whether to operate the handheld apparatus in the first mode of wireless communication or in the second mode of wireless communication comprises: detecting a first radiation strength associated with a first signal received or transmitted by the one or more antennas in the first mode of wireless communication; detecting a second radiation strength associated with a second signal received or transmitted by the one or more antennas in the second mode of wireless communication; performing a comparison involving the first radiation strength and the second radiation strength; and determining to operate the handheld apparatus in either the first mode of wireless communication or the second mode of wireless communication based on a result of the comparison. ### Claim 10 (depends on 9) The method of claim 9, wherein the determining to operate the handheld apparatus in either the first mode of wireless communication or the second mode of wireless communication based on the result of the comparison comprises: determining to operate the handheld apparatus in the first mode of wireless communication in response to the result of the comparison indicating the first radiation strength being greater than the second radiation strength; and determining to operate the handheld apparatus in the second mode of wireless communication in response to the result of the comparison indicating the second radiation strength being greater than the first radiation strength. ### Claim 11 (depends on 1) The method of claim 1, wherein the detecting of the condition with respect to wireless communication of the handheld apparatus having one or more antennas to determine whether to operate the handheld apparatus in the first mode of wireless communication or in the second mode of wireless communication comprises: operating the handheld apparatus in one of the first mode of wireless communication and the second mode of wireless communication as a default mode of wireless communication; detecting whether a first radiation strength associated with a first signal received or transmitted by the one or more antennas in the default mode of wireless communication of the handheld apparatus is below a threshold; and determining whether to change the default mode of wireless communication of the handheld apparatus based on the detecting. ### Claim 12 (depends on 11) The method of claim 11, wherein the determining of whether to change the default mode of wireless communication of the handheld apparatus based on the detecting comprises: in response to the first radiation strength associated with the first signal being not below the threshold, maintaining the handheld apparatus in the default mode of wireless communication; and in response to the first radiation strength associated with the first signal being below the threshold, performing operations comprising: detecting that a second radiation strength associated with a second signal received or transmitted by the one or more antennas in another mode of wireless communication; performing a comparison involving the first radiation strength and the second radiation strength; and determining to change the handheld apparatus to the another mode of wireless communication in response to a result of the comparison indicating the second radiation strength being greater than the first radiation strength. ### Claim 13 (depends on 1) The method of claim 1, wherein the one or more first shorting ports comprise a first port directly connected to an electrical ground, and wherein the one or more second shorting ports comprise a second port directly connected to the electrical ground. ### Claim 14 (depends on 1) The method of claim 1, wherein the one or more first shorting ports comprise a first port connected to an electrical ground through one or more first electrical elements, and wherein the one or more second shorting ports comprise a second port connected to the electrical ground through one or more second electrical elements. ### Claim 15 (depends on 14) The method of claim 14, wherein the one or more first electrical elements comprise a first switching circuit and a plurality of first impedance elements configured to provide different impedance values and serially coupled between the first port and the electrical ground, and wherein the one or more second electrical elements comprise a second switching circuit and a plurality of second impedance elements configured to provide different impedance values and serially coupled between the second port and the electrical ground. ### Claim 16 (depends on 14) The method of claim 14, wherein the one or more first shorting ports further comprise a third port connected to the electrical ground through the one or more first electrical elements, and wherein the one or more second shorting ports further comprise a fourth port connected to the electrical ground through the one or more second electrical elements. ### Claim 17 (depends on 16) The method of claim 16, wherein the one or more first electrical elements comprise a first switching circuit and a plurality of first impedance elements configured to provide different impedance values and serially coupled between the first port and the electrical ground, and wherein the one or more second electrical elements comprise a second switching circuit and a plurality of second impedance elements configured to provide different impedance values and serially coupled between the second port and the electrical ground. ### Claim 18 An apparatus, comprising: a casing having a first distal end, a second distal end opposite the first distal end, a first side, and a second side opposite the first side, the first side and the second side disposed between the first distal end and the second distal end; one or more antennas disposed adjacent the first distal end of the casing; a first feeding port adjacent the first distal end of the casing; a second feeding port adjacent the first distal end of the casing; one or more first shorting ports adjacent the first distal end of the casing; one or more second shorting ports adjacent the first distal end of the casing; and a control circuit communicatively coupled to the one or more antennas and configured to perform operations comprising: detecting a condition with respect to wireless communication through the one or more antennas to determine whether to operate in a first mode of wireless communication or in a second mode of wireless communication; in response to a determination to operate in the first mode, electrically connecting the first feeding port and the one or more first shorting ports to at least one antenna of the one or more antennas; and in response to a determination to operate in the second mode, electrically connecting the second feeding port and the one or more second shorting ports to the at least one antenna of the one or more antennas, wherein the at least one antenna has a symmetric antenna structure with a first slot toward the first side of the casing and a second slot toward the second side of the casing, wherein the first slot is associated with the first feeding port and the one or more first shorting ports such that the first slot, the first feeding port and the one or more first shorting ports are utilized in the first mode, and wherein the second slot is associated with the second feeding port and the one or more second shorting ports such that the second slot, the second feeding port and the one or more second shorting ports are utilized in the second mode. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein, in the first mode of wireless communication, the one or more antennas wirelessly transmit and receive with a first radiation pattern, and wherein, in the second mode of wireless communication, the one or more antennas wirelessly transmit and receive with a second radiation pattern different from the first radiation pattern. ### Claim 20 (depends on 18) The apparatus of claim 18, further comprising: an auxiliary antenna disposed adjacent the second distal end of the casing, wherein the control circuit is further configured to receive wireless signals through the auxiliary antenna to supplement wireless receiving by the one or more antennas in each of the first mode and the second mode of wireless communication. ### Claim 21 (depends on 18) The apparatus of claim 18, wherein a distance between the first feeding port and the first side of the casing is less than a distance between the second feeding port and the first side of the casing, and wherein a distance between the second feeding port and the second side of the casing is less than a distance between the first feeding port and the second side of the casing. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein a distance between the one or more first shorting ports and the first side of the casing is less than a distance between the one or more second shorting ports and the first side of the casing, and wherein a distance between the one or more second shorting ports and the second side of the casing is less than a distance between the one or more first shorting ports and the second side of the casing. ### Claim 23 (depends on 18) The apparatus of claim 18, wherein the one or more antennas form a cross-polarized log-periodic dipole (CLPD) antenna. ### Claim 24 (depends on 18) The apparatus of claim 18, wherein the first feeding port and the one or more first shorting ports are associated with a first antenna of the one or more antennas, and wherein the second feeding port and the one or more second shorting ports are associated with a second antenna of the one or more antennas. ### Claim 25 (depends on 18) The apparatus of claim 18, wherein the first feeding port and the one or more second shorting ports are associated with a first antenna of the one or more antennas, and wherein the second feeding port and the one or more first shorting ports are associated with a second antenna of the one or more antennas. ### Claim 26 (depends on 18) The apparatus of claim 18, wherein, in detecting the condition with respect to wireless communication through the one or more antennas to determine whether to operate in the first mode of wireless communication or in the second mode of wireless communication, the control circuit is configured to perform operations comprising: detecting a first radiation strength associated with a first signal received or transmitted by the one or more antennas in the first mode of wireless communication; detecting a second radiation strength associated with a second signal received or transmitted by the one or more antennas in the second mode of wireless communication; performing a comparison involving the first radiation strength and the second radiation strength; and determining to operate in either the first mode of wireless communication or the second mode of wireless communication based on a result of the comparison. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein, in determining to operate in either the first mode of wireless communication or the second mode of wireless communication based on the result of the comparison, the control circuit is configured to perform operations comprising: determining to operate in the first mode of wireless communication in response to the result of the comparison indicating the first radiation strength being greater than the second radiation strength; and determining to operate in the second mode of wireless communication in response to the result of the comparison indicating the second radiation strength being greater than the first radiation strength. ### Claim 28 (depends on 18) The apparatus of claim 18, wherein, in detecting the condition with respect to wireless communication through the one or more antennas to determine whether to operate in the first mode of wireless communication or in the second mode of wireless communication, the control circuit is configured to perform operations comprising: operating in one of the first mode of wireless communication and the second mode of wireless communication as a default mode of wireless communication; detecting whether a first radiation strength associated with a first signal received or transmitted by the one or more antennas in the default mode of wireless communication is below a threshold; and determining whether to change the default mode of wireless communication based on the detecting. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein, in determining whether to change the default mode of wireless communication based on the detecting, the control circuit is configured to perform operations comprising: in response to the first radiation strength associated with the first signal being not below the threshold, maintaining in the default mode of wireless communication; and in response to the first radiation strength associated with the first signal being below the threshold, performing operations comprising: detecting that a second radiation strength associated with a second signal received or transmitted by the one or more antennas in another mode of wireless communication; performing a comparison involving the first radiation strength and the second radiation strength; and determining to change from the default mode to the another mode of wireless communication in response to a result of the comparison indicating the second radiation strength being greater than the first radiation strength. ### Claim 30 (depends on 18) The apparatus of claim 18, wherein the one or more first shorting ports comprise a first port directly connected to an electrical ground, and wherein the one or more second shorting ports comprise a second port directly connected to the electrical ground. ### Claim 31 (depends on 18) The apparatus of claim 18, further comprising: one or more first electrical elements; and one or more second electrical elements, wherein the one or more first shorting ports comprise a first port connected to an electrical ground through the one or more first electrical elements, and wherein the one or more second shorting ports comprise a second port connected to the electrical ground through the one or more second electrical elements. ### Claim 32 (depends on 31) The apparatus of claim 31, wherein the one or more first electrical elements comprise a first switching circuit and a plurality of first impedance elements configured to provide different impedance values and serially coupled between the first port and the electrical ground, and wherein the one or more second electrical elements comprise a second switching circuit and a plurality of second impedance elements configured to provide different impedance values and serially coupled between the second port and the electrical ground. ### Claim 33 (depends on 31) The apparatus of claim 31, wherein the one or more first shorting ports further comprise a third port connected to the electrical ground through the one or more first electrical elements, and wherein the one or more second shorting ports further comprise a fourth port connected to the electrical ground through the one or more second electrical elements. ### Claim 34 (depends on 33) The apparatus of claim 33, wherein the one or more first electrical elements comprise a first switching circuit and a plurality of first impedance elements configured to provide different impedance values and serially coupled between the first port and the electrical ground, and wherein the one or more second electrical elements comprise a second switching circuit and a plurality of second impedance elements configured to provide different impedance values and serially coupled between the second port and the electrical ground.